Radiation Scanning Equipment

Abstract

The radiation scanning device comprises a transport device (1) for transporting a subject (6) through a scanning area of ​​the radiation scanning device, a radiation source (3) including a plurality of radiation source modules (31, 32, 33, 34) each having at least one radiation source point of a radiation beam, the radiation source (3) being arranged around the scanning area above the transport device (1) and fixed in a plane perpendicular to the transport direction of the subject (6), and a plurality of radiation source modules (31, 32, 33, 34) arranged with their ends connected to each other so as to surround the scanning area and arranged to transport the subject. the radiation source (3) and the detector (4) are disposed so as to overlap at least partially along the transport direction of the subject (6), and the plurality of radiation source modules (31, 32, 33, 34) are detachable from one another individually.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 202110769674.8, entitled "Radiation Scanning Apparatus," filed on July 7, 2021, the entire contents of which are incorporated herein by reference.

[0002] This application is in the field of data radiation imaging, and in particular relates to radiation scanning equipment. [Background technology]

[0003] Conventional static computed tomography (CT) technology (distributed multi-point radiation source) or multi-viewing angle (single-point radiation source) security inspection devices usually have multiple different viewing angles arranged in different planes perpendicular or oblique to the transport direction of the object, or all radiation sources are concentrated in a separate annular or rectangular sealed cavity. Most of the crystals in the detector array are perpendicular to the central plane of the radiation beam of the radiation source, and the same set of detector arrays corresponds to one set of distributed multi-point radiation sources or only one single-point radiation source.

[0004] Related technologies include a static CT with a double-ring structure design, which mimics the operating principle of a slip-ring CT, with the radiation source and detector arranged in two different rings, with the radiation source ring and the detector ring spaced apart along the direction of the subject's transport. Summary of the Invention

[0005] The embodiments of the present application provide a radiation scanning device that can solve the problems of poor reliability and maintenance caused by multiple radiation sources being concentrated in individual annular sealed cavities, and each detector set can be shared by multiple radiation source modules to reduce equipment costs, and also facilitate detector replacement or maintenance when the optical path coverage range is kept as short as possible, while at the same time reducing the tilt angle between the center of the radiation beam and the surface of the detector, thereby improving image quality.

[0006] According to a first aspect, an embodiment of the present application provides a radiation scanning device, the radiation scanning device comprising: a transport device that transports a subject to pass through a scanning region of the radiation scanning device; a radiation source comprising a plurality of radiation source modules, each having at least one radiation source point of a radiation beam, arranged around the scanning region above the transport device and fixed in a plane perpendicular to the transport direction of the subject; and a detector comprising a group of multiple detectors, the ends of which are connected to each other and arranged to surround the scanning region and fixed in a plane perpendicular to the transport direction of the subject, the detector being used to detect radiation transmitted through the subject during the scanning period, the detector being located between the radiation source and the scanning region along a direction perpendicular to the transport direction of the subject, and the radiation source and the detector being arranged so as to at least partially overlap along the transport direction of the subject, and the plurality of radiation source modules are individually detachable from each other.

[0007] In the radiation scanning device of this embodiment, radiation source modules are arranged around the scanning area only above the conveying device, and no radiation source modules are arranged below the conveying device, and detectors are arranged around the scanning area.This radiation scanning device can reduce the height of the conveying device, make it easier to move the subject to the conveying device of the radiation scanning device, and reduce manufacturing costs while maintaining image quality.

[0008] According to some embodiments, the radiation source module is a distributed multi-point radiation source, and the plurality of radiation source modules are arranged in a non-enclosed structure surrounding the scanning region and opening downward to the transport device.

[0009] According to some embodiments, each of the plurality of radiation source modules is a linearly distributed multi-point radiation source, and the plurality of linearly distributed multi-point radiation sources are arranged above, to the left and to the right of the scanning region, and ends of the plurality of linearly distributed multi-point radiation sources are directly connected or spaced apart.

[0010] According to some embodiments, the multiple radiation source module comprises a plurality of first distributed multi-point radiation sources and a plurality of second distributed multi-point radiation sources, wherein the plurality of first distributed multi-point radiation sources and the plurality of second distributed multi-point radiation sources are alternately arranged and directly connected end to end or spaced apart.

[0011] According to some embodiments, the first distributed multipoint radiation source is a linear distributed multipoint radiation source, and the second distributed multipoint radiation source is a linear distributed multipoint radiation source or an arc-shaped distributed multipoint radiation source having a length shorter than that of the first distributed multipoint radiation source.

[0012] According to some embodiments, each of the plurality of radiation source modules is a single-point radiation source group, and the plurality of single-point radiation source groups are arranged at least at a left field angle, a right field angle, a top field angle and a corner oblique field angle above the transport device, and each single-point radiation source group includes at least two single-point radiation sources.

[0013] According to some embodiments, each radiation source module has a separate cavity for housing a respective radiation generating device.

[0014] According to some embodiments, an attachment and positioning structure is provided in each individual cavity of each radiation source module, and the attachment and positioning structure is used to attach and position the radiation source module, and rotate the radiation source module to adjust the beam output angle of the radiation beam.

[0015] According to some embodiments, each detector group is a detector array comprising a plurality of detector units, and the plurality of detector groups are arranged in a closed square, rectangular, polygonal or elliptical structure surrounding the scanning area.

[0016] According to some embodiments, each detector group is a linear detector array, and the detector comprises four linear detector arrays, which are arranged at four sides of the scanning area, above, below, left and right, forming a rectangular or square structure.

[0017] According to some embodiments, each detector group is a linear detector array, and the detectors include a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays being shorter than the first linear detector arrays, and the first linear detector arrays and the second linear detector arrays being alternately arranged around the scanning area to form a polygonal structure.

[0018] According to some embodiments, each detector group of detectors is independently detachable from each other.

[0019] According to some embodiments, each detector group of detectors is configured to be attached and detached by moving along the transport direction of the object.

[0020] According to some embodiments, each detector group of the detectors is configured such that some detector groups are attached and detached by moving along the transport direction of the subject, and other detector groups are attached and detached by moving along a direction perpendicular to the transport direction of the subject.

[0021] According to some embodiments, each detector group of the detectors comprises a detector arm, the radiation scanning device comprises a support frame fixed to a mounting base of the radiation scanning device, and the detector group is attached to or detached from the support frame by moving via the detector arm along the transport direction of the subject or along a direction perpendicular to the transport direction of the subject.

[0022] According to some embodiments, each detector group of detectors is configured to avoid radiation of the radiation source module on the same side and to receive radiation of all remaining radiation source modules except for the radiation source module on the same side.

[0023] According to some embodiments, each detector unit of the detector group comprises a detector crystal for transmitting radiation transmitted through the subject during a scanning period, the detector crystal being arranged at an end of the detector unit along the subject transport direction and being arranged close to the edge of the radiation beam of the radiation source module on the same side of the subject transport direction but not blocking the radiation beam.

[0024] According to some embodiments, each source module of the radiation source is arranged such that its radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.

[0025] According to some embodiments, each radiation source module is configured to rotate about a target axis such that a central position of the radiation beam impinges on a detector crystal of an opposite detector bank.

[0026] According to some embodiments, the radiation manipulation equipment further comprises an image processing module arranged to perform data compensation and / or reconstruction image restoration for projection data loss at the ends of the radiation source module to obtain a complete reconstructed image.

[0027] According to some embodiments, the image processing module is configured to perform image reconstruction by an iterative method, an image restoration method or a combination of both.

[0028] According to a second aspect, an embodiment of the present application further provides a radiation scanning device, the radiation scanning device comprising: a transport device that transports a subject to pass through a scanning area of ​​the radiation scanning device; a radiation source comprising: a plurality of radiation source modules, each having at least one radiation source point that emits a radiation beam, the plurality of radiation source modules being arranged around the scanning area in a non-sealed structure that opens to the left or right side of the scanning area and fixed in a plane perpendicular to the transport direction of the subject; and a detector comprising a plurality of detector groups that are connected to each other at their ends and arranged to surround the scanning area and fixed in a plane perpendicular to the transport direction of the subject, the detector being used to detect radiation that has passed through the subject during the scanning period, the detector being located between the radiation source and the scanning area in a direction perpendicular to the transport direction of the subject, the radiation source and the detector being arranged so as to at least partially overlap each other along the transport direction of the subject, and the plurality of radiation source modules being individually detachable from each other.

[0029] In the radiation scanning device of this embodiment, the radiation source modules are arranged above, below, and to the left or right of the scanning area so as to surround the scanning area, and the detectors are arranged around the scanning area. Such a radiation scanning device is applied to detecting baggage at airports, and by taking advantage of the characteristics of airport baggage that are large in width and small in thickness, the effects of self-shielding of the baggage and radiation attenuation on projection data can be taken into consideration, thereby reducing manufacturing costs while ensuring high image quality.

[0030] According to some embodiments, the radiation source module is a distributed multi-point radiation source, and the plurality of radiation source modules are arranged around the scanning region in a non-sealed structure that opens to the left or right side of the scanning region.

[0031] According to some embodiments, each of the plurality of radiation source modules is a linearly distributed multi-point radiation source, and the plurality of linearly distributed multi-point radiation sources are respectively arranged above, below, and on the left or right side of the scanning region, thereby forming a non-sealed structure that opens to the left or right side of the scanning region, and the ends of the plurality of linearly distributed multi-point radiation sources are directly connected or arranged at intervals.

[0032] According to some embodiments, the multiple radiation source module comprises a plurality of first distributed multi-point radiation sources and a plurality of second distributed multi-point radiation sources, wherein the plurality of first distributed multi-point radiation sources and the plurality of second distributed multi-point radiation sources are alternately arranged and directly connected end to end or spaced apart.

[0033] According to some embodiments, the first distributed multipoint radiation source is a linear distributed multipoint radiation source, and the second distributed multipoint radiation source is a linear distributed multipoint radiation source or an arc-shaped distributed multipoint radiation source having a length shorter than that of the first distributed multipoint radiation source.

[0034] According to some embodiments, each of the plurality of radiation source modules is a single-point radiation source group, and the plurality of single-point radiation source groups are arranged at at least a top-side viewing angle, a bottom-side viewing angle, a left-side viewing angle, or a right-side viewing angle and at least some corner oblique viewing angles of the scanning area, and each single-point radiation source group includes at least two single-point radiation sources.

[0035] According to some embodiments, each radiation source module has a separate cavity for housing a respective radiation generating device.

[0036] According to some embodiments, the cavity of each radiation source module comprises a separate vacuum chamber for accommodating multiple target points.

[0037] According to some embodiments, the spacing between target points within each radiation source module is smaller than the spacing between target points at the ends of adjacent radiation source modules.

[0038] According to some embodiments, the individual cavities of each radiation source module are provided with mounting and positioning structures, which are used to mount and position the radiation source modules and rotate the radiation source modules to adjust the beam output angle of the radiation beam.

[0039] According to some embodiments, each detector group is a detector array comprising a plurality of detector units, and the plurality of detector groups are arranged in a closed square, rectangular, polygonal or elliptical structure surrounding the scanning area.

[0040] According to some embodiments, each detector group is a linear detector array, and the detector comprises four linear detector arrays, which are arranged at the top, bottom, left, right and four sides of the scanning area, forming a rectangular or square structure.

[0041] According to some embodiments, each detector group is a linear detector array, and the detectors include a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays being shorter than the first linear detector arrays, and the plurality of first linear detector arrays and the plurality of second linear detector arrays being alternately arranged around the scanning region to form a polygonal structure.

[0042] According to some embodiments, each detector group of detectors is independently detachable from each other.

[0043] According to some embodiments, the detector groups above and below the scanning region and at the opening of the radiation source structure are configured to be attached and detached by moving perpendicular to the transport direction of the subject, and the detector group on the opposite side of the opening of the radiation source structure is configured to be attached and detached by moving along the transport direction of the subject.

[0044] According to some embodiments, each detector group of the detector comprises a detector arm, the radiation scanning device comprises a support frame fixed to a mounting base of the radiation scanning device, and the detector groups are attached to or detached from the support frame via the detector arms.

[0045] According to some embodiments, each detector group of detectors is configured to avoid the radiation beam of the radiation source module on the same side and to receive radiation of all remaining radiation source modules on the other side except for the radiation source module on the same side.

[0046] According to some embodiments, each detector unit of the detector group comprises a detector crystal for receiving radiation transmitted through the subject during a scanning period, the detector crystal being arranged at an end of the detector unit along the transport direction of the subject and arranged close to the edge of the radiation beam of the radiation source module on the same side of the transport direction of the subject, but configured so as not to block the radiation beam.

[0047] According to some embodiments, each source module of the radiation source is positioned such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.

[0048] According to some embodiments, each radiation source module is configured to rotate about a target axis such that a central position of the radiation beam illuminates a detector crystal of an opposing detector bank.

[0049] According to some embodiments, the radiation scanning apparatus further comprises an image processing module arranged to perform data compensation and / or reconstruction image restoration for projection data loss at the ends of the radiation source module to obtain a complete reconstructed image.

[0050] According to some embodiments, the image processing module is configured to perform image reconstruction by an iterative method, an image restoration method or a combination of both.

[0051] According to a third aspect, an embodiment of the present application further provides a radiation scanning device, comprising: a transport device that transports a subject to pass through a scanning region of the radiation scanning device; a radiation source comprising: a plurality of radiation source modules, each having at least one radiation source point that emits a radiation beam, the plurality of radiation source modules being arranged to surround the scanning region in a non-sealed structure that opens to one side of the scanning region when viewed along the direction of transport of the subject; and a plurality of detector groups, the ends of which are connected to each other and arranged to surround the scanning region in a non-sealed structure that opens to the one side of the scanning region, the detector being used to detect radiation transmitted through the subject during the scanning period, wherein the opening of the non-sealed structure of the radiation source and the opening of the non-sealed structure of the detector are arranged opposite each other, the plurality of detector groups of the detector are fixed in the same plane perpendicular to the direction of transport of the subject, and the plurality of radiation source modules of the radiation source are arranged in a plurality of different planes perpendicular to the direction of transport of the subject.

[0052] In the radiation scanning device of this embodiment, the radiation source and the detector both surround the scanning area on only three sides, and compared to the case where the scanning area is surrounded on four sides (either the radiation source or the detector, or both), sufficient data can be acquired to perform image reconstruction, which reduces the cost of the device and the weight of the device, thereby providing a lightweight radiation scanning device.

[0053] According to some embodiments, a radiation source module in which the radiation source is located on the open side of the non-sealed structure of the detector and a plurality of detector groups of the detector are fixed in the same plane perpendicular to the transport direction of the object, and other radiation source modules of the radiation source are fixed in other planes perpendicular to the transport direction of the object.

[0054] According to some embodiments, other radiation source modules of the radiation source are fixed in other coplanar planes perpendicular to the transport direction of the object.

[0055] According to some embodiments, the multiple radiation source modules are attached and detached independently of each other.

[0056] According to some embodiments, each of the plurality of radiation source modules is a distributed multi-point radiation source, and when viewed along the transport direction of the subject, the plurality of distributed multi-point radiation sources are respectively arranged on three sides of the scanning area, thereby forming a non-sealed structure with one side open that surrounds the scanning area.

[0057] According to some embodiments, the distributed multi-point radiation source is a straight line, an arc line, a polygonal line, or any combination thereof, and when viewed from the transport direction of the subject, the radiation source forms a right-angled rectangular, rounded rectangular, polygonal, or elliptical structure with an opening on one side of the scanning region.

[0058] According to some embodiments, each of the plurality of radiation source modules is a group of single point radiation sources, each group of single point radiation sources comprising at least two single point radiation sources.

[0059] According to some embodiments, each radiation source module has a separate cavity for housing a respective radiation generating device.

[0060] According to some embodiments, the cavity of each radiation source module comprises a separate vacuum chamber for accommodating multiple target points.

[0061] According to some embodiments, the spacing between target points within each radiation source module is smaller than the spacing between target points at the ends of adjacent radiation source modules.

[0062] According to some embodiments, the individual cavities of each radiation source module are provided with mounting and positioning structures, which are used to mount and position the radiation source modules and rotate the radiation source modules to adjust the output angle of the radiation beam.

[0063] According to some embodiments, each detector group is a detector array comprising a plurality of detector units, the detector array comprising a linear detector array, an arc-shaped detector array, or a combination of both.

[0064] According to some embodiments, each detector group is a linear detector array, and the detector comprises three linear detector arrays, each arranged on three sides of the scanning area to form a rectangular or square structure opening to one side of the scanning area.

[0065] According to some embodiments, each detector group is a linear detector array, and the detector comprises a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays being shorter than the first linear detector arrays, and the plurality of first linear detector arrays and the plurality of second linear detector arrays being alternately arranged around the scanning area to form a polygonal structure opening on one side of the scanning area.

[0066] According to some embodiments, each detector group of detectors may be attached or detached independently of each other.

[0067] According to some embodiments, the detector bank of detectors is configured to be attached and detached by moving perpendicular or parallel to the direction of transport of the object.

[0068] According to some embodiments, each detector group of the detector comprises a detector arm, the radiation scanning device comprises a support frame fixed to a mounting base of the radiation scanning device, and the detector groups are attached to or detached from the support frame via the detector arms.

[0069] According to some embodiments, when viewed from the transport direction of the subject, the detector is arranged between the radiation source and the scanning region and at least partially overlaps with other radiation source modules and a group of detectors on the same side along the transport direction of the subject.

[0070] According to some embodiments, the detector group on the same side as the other radiation source modules of the detector is configured to avoid the radiation beam of the radiation source module on the same side and to receive radiation of all remaining radiation source modules on the same side except for the radiation source module on the same side.

[0071] According to some embodiments, each detector unit of the detector group comprises a detector crystal for receiving radiation transmitted through the subject during the scanning period, the detector crystal being arranged at an end of the detector unit along the transport direction of the subject, and the detector crystal of the detector group on the same side as other radiation source modules of the detector being arranged close to the edge of the radiation beam of the radiation source module on the same side in the transport direction of the subject but not blocking the radiation beam.

[0072] According to some embodiments, the other radiation source modules of the radiation source are positioned such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.

[0073] According to some embodiments, the other radiation source module is configured to rotate about a target axis such that a central position of the radiation beam illuminates a detector crystal of an opposite detector bank.

[0074] According to some embodiments, the radiation scanning apparatus further comprises an image processing module arranged to perform data compensation and / or reconstruction image restoration for projection data loss at the ends of the radiation source module to obtain a complete reconstructed image.

[0075] According to some embodiments, the image processing module is configured to perform image reconstruction by an iterative method, an image restoration method or a combination of both.

[0076] According to a fourth aspect, an embodiment of the present application provides a radiation source mounting and positioning structure of a radiation source scanning device comprising a radiation source and a fixedly installed support frame, the radiation source mounting and positioning structure including a main body, the main body being fixedly connected to the radiation source and the support frame, the radiation source being fixedly mounted on the support frame via the main body, the mounting and positioning structure including a moving device by which the radiation source is moved to a predetermined mounting position in a first plane, a first positioning device for positioning the radiation source in the first plane, and a lifting device for adjusting the position of the radiation source along a first direction, the first direction being perpendicular to the first plane, and a second positioning device for fixing the position of the radiation source in the first direction.

[0077] The mounting and positioning structure according to the above embodiment allows each radiation source module of the radiation source to be individually mounted and detached, and also allows the beam emission angle of the radiation source module to be adjusted.

[0078] According to some embodiments, the moving device comprises rollers provided at both ends along the longitudinal direction of the radiation source.

[0079] According to some embodiments, the first positioning device comprises a first positioning pin and a first pin hole provided in the body and the support frame, the first pin hole corresponding to the first positioning pin.

[0080] According to some embodiments, the lifting devices are installed at both ends along the longitudinal direction of the radiation source, the lifting device at one end being formed as a liftable roller and the lifting device at the other end being formed as a wire rope.

[0081] According to some embodiments, the second positioning device is formed as a positioning block, which is arranged below the main body after the radiation source has been adjusted to a predetermined position along the first direction by the lifting device.

[0082] According to some embodiments, the mounting and positioning structure further comprises an adjustment device for rotating the radiation source along a predetermined axis to adjust the beam output angle of the radiation source.

[0083] According to some embodiments, the radiation source is provided with a mounting shaft, the body is provided with a corresponding axial hole, the body is attached to the mounting shaft of the radiation source through the axial hole, the positioning mounting structure further includes a positioning member and a fastener, the body is positioned relative to the radiation source by engagement between the positioning member and the axial hole and the mounting shaft, and is fixedly connected to the radiation source by the fastener, and the adjustment device includes a rotation drive device, which can rotate the radiation source around the mounting shaft when the positioning member and the fastener are loosened.

[0084] According to some embodiments, the rotary drive device comprises an adjustment block fixed to the radiation source and a set screw abutting the adjustment block provided on the main body, and the set screw can be rotated to move the adjustment block, thereby rotating the radiation source.

[0085] According to some embodiments, the positioning member comprises a second positioning pin and a corresponding second pin hole formed in the body and the radiation source, and the fastener comprises a fixing bolt and a corresponding screw hole formed in the body and the radiation source.

[0086] According to some embodiments, there is further provided a radiation scanning apparatus comprising a radiation source and a fixedly mounted support frame, the radiation source being fixedly attached to the support frame via the mounting and locating structure of any of the above embodiments.

[0087] According to some embodiments, the radiation scanning device rotates the radiation source by means of a mounting and positioning structure to adjust the beam output angle of the radiation source.

[0088] According to a fifth aspect, an embodiment of the present application further provides a mounting and fixing structure for a detector of a radiation scanning device, the radiation scanning device comprising a detector and a fixedly installed support frame, the detector including one or more detector groups, the detector groups being fixedly attached to the support frame or detached from the support frame via the mounting and fixing structure, the mounting and fixing structure comprising: a first mounting portion fixedly attached to the detector group; a second mounting portion fixedly fixed to the support frame and linearly movably engaged with the first mounting portion, and movable along the second mounting portion to a predetermined mounting position with the first mounting portion and the second mounting portion engaged with each other; and a fixing device provided on one side along the width direction of the detector group, for fixing the detector group relative to a mounting reference surface of the support frame.

[0089] According to the mounting and fixing structure of the above embodiment, when each detector group of detectors is individually attached and detached and placed inside the radiation source module, attachment, detachment, and maintenance can be performed without the need to remove the radiation source module, thereby improving the convenience of attachment, detachment, and maintenance of the detector groups.

[0090] According to some embodiments, the second mounting portion is further arranged to support the detector cluster in a predetermined mounting position while engaged with the first mounting portion.

[0091] According to some embodiments, the first mounting portion comprises a slider, the slider extending along the length of the detector cluster, and the second mounting portion comprises a fixed rail that engages the slider.

[0092] According to some embodiments, the fixing device comprises a fixing device and a positioning member provided on the support frame, the end face of the positioning member away from the support frame being formed as an attachment reference surface that abuts against a surface on one side along the width direction of the detector group, and a fastener passes through the positioning member and fastens the detector group against the end face of the positioning member.

[0093] According to some embodiments, the sliders are provided on opposite sides of the detector group in the width direction and have inner extensions extending inward from the edges of the detector group on opposite sides in the width direction, and the fixed guide rails have outer extensions extending outward from the edges of the detector group on opposite sides in the width direction, and when the first mounting portion and the second mounting portion are engaged, the inner extensions of the sliders are positioned above the outer extensions of the fixed rails and the two are arranged in contact and overlapping relationship, allowing the detector group to be suspended from the fixed rails.

[0094] According to some embodiments, a fixed guide rail supports the slider below the slider.

[0095] According to some embodiments, the first mounting portion is formed as a slide groove extending in the width direction of the detector group, and the second mounting portion is formed as a slide rod that engages with the slide groove.

[0096] According to some embodiments, a convex portion is formed at one end of the slide rod close to the support frame, and the surface of the convex portion facing the detector group is formed as an attachment reference surface for abutting against the surface on the other side along the width direction of the detector group.

[0097] According to some embodiments, the fixing devices are provided at the other end of the slide rod opposite the protrusion, and are arranged to abut on both sides of the detector group in the width direction together with the protrusion.

[0098] According to some embodiments, the fixing device includes a positioning sleeve and a fixing tool, the positioning sleeve is fitted onto the other end of the slide rod and abuts against one side along the width direction of the detector, and the fastener is used to fix the positioning sleeve to the other end of the slide rod.

[0099] According to some embodiments, the second mounting portion includes two slide rods, and the first mounting portion has two slide grooves formed at both ends along the longitudinal direction of the detector group, and the two slide rods and the two slide grooves are engaged with each other, respectively, to position the detector group at a predetermined mounting position.

[0100] According to some embodiments, the first mounting portion is formed as a fixed block fixed to one side along the width direction of the detector group, the fixed block having an opening facing one side of the thickness direction of the detector group, and the second mounting portion is formed as a cantilever portion fixed to the support frame, and an extension portion is provided at the end of the cantilever portion away from the support frame, and the extension portion can be linearly movably engaged with the opening of the fixed block.

[0101] According to some embodiments, the fixing device comprises a fixing member provided on the support frame, and a fixing member, the end face of the fixing member away from the support frame is formed as an attachment reference surface for abutting against a surface on one side along the width direction of the detector group, and the fastening member is for tightening the detector group against the end face of the fixing member.

[0102] According to some embodiments, when the first mounting portion and the second mounting portion are engaged, the cantilever portion supports the detector group in a predetermined mounting position by means of the fixing block.

[0103] According to some embodiments, there is provided a radiation scanning device comprising a detector and a fixedly mounted support frame, the detector comprising one or more detector groups, the detector groups being attached and fixed to or detached from the support frame by the mounting and fixing structure of any of the above embodiments.

[0104] In some embodiments, the width direction of the detector group is parallel to the transport direction of the object, and the length and thickness directions of the detector group are perpendicular to the transport direction of the object, which is the direction in which the object is transmitted and passes through the scanning area of ​​the radiation scanning equipment.

[0105] According to some embodiments, when the detector includes a plurality of detector groups, the mounting reference planes used for each of the plurality of detector groups are located in the same plane perpendicular to the transport direction of the object.

[0106] According to some embodiments, the direction of linear movement of the first mounting part relative to the second mounting part is parallel or perpendicular to the direction of transport of the object.

[0107] Other features and technical advantages of the present application will become more apparent with reference to the following drawings and detailed descriptions of other embodiments. [Brief explanation of the drawings]

[0108] In order to more clearly explain the technical solutions of the embodiments of the present application or related art, the following briefly introduces drawings necessary for the embodiments or related art, and it is clear that the following drawings are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts.

[0109] [Figure 1] 1 shows a structural schematic diagram of a radiation scanning device according to some embodiments of the present application; [Figure 2] FIG. 2 is a schematic diagram showing the specific structure of a radiation source and a detector of the radiation scanning device shown in FIG. [Figure 3] 1 is a schematic diagram illustrating a radiation beam shape of a radiation source according to some embodiments of the present application; [Figure 4] 1 is a schematic diagram illustrating a radiation source distribution in the form of a target according to some embodiments of the present application; [Figure 5] 1 is a schematic diagram of a mounting and positioning structure for a radiation source module according to some embodiments of the present application; [Figure 6] FIG. 1 is a schematic diagram of a detector distribution according to some embodiments of the present application. [Figure 7] 1 is a structural schematic diagram of a linear detector array according to some embodiments of the present application; [Figure 8] 1 is a structural schematic diagram of a detector unit according to some embodiments of the present application; [Figure 9] 1 is a schematic diagram of a mounting and fixing structure for a detector group according to some embodiments of the present application; [Figure 10]1 is a schematic diagram of a radiation source module and a corresponding relationship between the radiation source module and a detector group that receives the radiation, according to some embodiments of the present application; [Figure 11] 2 is a diagram showing a cross-sectional structure of the centerline of the radiation scanning device shown in FIG. 1 along the transport direction of the object according to some embodiments of the present application; [Figure 12] FIG. 1 is a plan view schematic diagram illustrating a layout of detectors and radiation sources according to some embodiments of the present application. [Figure 13] 1 is a schematic diagram of a detector and radiation source combination according to some embodiments of the present application; [Figure 14] 14 is a schematic diagram of a detector group removal direction for the detector and radiation source combination shown in FIG. 13, in accordance with some embodiments of the present application. [Figure 15] 1 is a suitable mounting structure for a detector array according to some embodiments of the present application; [Figure 16] 10 is a mounting structure suitable for a detector group according to some other embodiments of the present application. [Figure 17] 10 is a mounting structure suitable for a detector cluster according to further some embodiments of the present application; [Figure 18] 1 is a schematic diagram of a radiation source and detector arrangement for a radiation scanning device according to some embodiments of the present application; [Figure 19] 1 is a perspective schematic diagram illustrating the layout of radiation sources and detectors of a radiation scanning device according to some embodiments of the present application; [Figure 20] 20 is a side view of the arrangement of the radiation source and detector of the radiation scanning device shown in FIG. 19 as viewed from the Z-axis direction.

[0110] [Figure 21] FIG. 20 is a schematic plan view showing the layout of radiation sources and detectors of the radiation scanning device shown in FIG. 19. [Figure 22] 1 is a schematic diagram of a distribution of a single point radiation source of a radiation scanning device according to some embodiments of the present application; [Figure 23] 1 is a structural schematic diagram of a detector of a radiation scanning device according to some embodiments of the present application; [Figure 24] 1 is a schematic diagram of a mounting and dismounting direction of a detector according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0111] The features and exemplary embodiments of each aspect of the present application will be described in detail below. In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be described in more detail below with reference to the drawings and specific examples. It should be understood that the specific examples described herein are provided only to illustrate the present application and do not limit the present application. Those skilled in the art can implement the present application without the need for some of these specific details. The following description of the examples is intended to provide an example of the present application so as to better understand the present application.

[0112] It should be noted that, in this specification, relational terms such as "first" and "second" are used to distinguish one entity or operation from another, and do not necessarily require or imply the existence of any such relationship or order between those entities or operations. Furthermore, the terms "comprise," "have," or any other variation thereof are intended to cover a non-exclusive inclusion, whereby a process, method, article, or device comprising a set of elements not only includes those elements, but also other elements not expressly listed or elements inherent in such process, method, article, or device. Absent more limitations, elements qualified by the phrase "comprise" do not exclude the presence of other identical elements in a process, method, article, or device that includes the elements.

[0113] The static CT (distributed multi-point radiation source) or multi-viewing angle (single-point radiation source) device in the background art section above usually includes multiple planar lightwave circuits, which are arranged along the longitudinal direction of the device (i.e., the direction of transport of the subject). This arrangement method results in a long coverage area of ​​the entire optical path of the static CT (distributed multi-point radiation source) or multi-viewing angle (single-point radiation source) device, which is disadvantageous in reducing the overall length and weight of the device.

[0114] In addition, in an apparatus with the above layout, one set of detector arrays corresponds to only one set of distributed multi-point radiation sources or one single-point radiation source, which increases the number of detector arrays in the entire apparatus, which is detrimental to reducing the overall cost of the apparatus.

[0115] In equipment with the above-described layout, concentrating all of the radiation sources in individual annular or rectangular sealed cavities increases the complexity of the equipment, reduces the reliability of the equipment, and also makes it difficult to maintain the radiation sources, particularly for equipment that needs to be maintained at a high vacuum.

[0116] Furthermore, in the static CT with the double-ring structure design described above, the arrangement of the radiation source ring and the detector ring ensures that individual detectors can be shared by multiple radiation sources, but it does not solve the problems of poor reliability and maintainability caused by concentrating the radiation sources in individual annular sealed cavities. At the same time, if the distance between the radiation source ring and the detector ring is too close, the detector can only be replaced or maintained from inside the ring, making the detector difficult to maintain. If the distance between the radiation source ring and the detector ring is large enough, the detector can only be replaced or maintained from outside the ring. This arrangement increases the coverage area of ​​the optical path and the length of the device, and also creates an oblique angle between the center of the radiation beam and the surface of the detector crystal, causing the radiation beam to be obliquely irradiated onto the detector crystal, affecting image quality.

[0117] In order to solve the various technical problems described above, an embodiment of the present application includes a transport device that transports a test object so that the test object passes through a scanning area of ​​a radiation scanning device; a radiation source including a plurality of radiation source modules, each having at least one radiation source point that emits a radiation beam, arranged around the scanning area and fixed in a plane perpendicular to the test object transport direction; and a detector that transmits radiation transmitted through the test object during a scanning period and includes a plurality of detector groups, wherein the plurality of detector groups are arranged so as to surround the scanning area with their ends connected to each other and fixed in a plane perpendicular to the test object transport direction, the detector is located between the radiation source and the scanning area along a direction perpendicular to the test object transport direction, the radiation source and the detector are arranged so as to at least partially overlap along the test object transport direction, and the plurality of radiation source modules are individually attachable and detachable from each other.

[0118] According to the radiation scanning device of the present application, the radiation source is formed by a plurality of radiation source modules arranged around the scanning area, and the plurality of radiation source modules are individually detachable from each other, that is, each radiation source module has an individual cavity for accommodating a radiation generating device. Compared with the radiation source orbiting the scanning area in a monolithic manner, the radiation source formed by combining the plurality of radiation source modules of the present application can reduce the housing size of each individual radiation source module and the volume of the internal vacuum cavity, thereby making each individual radiation source module smaller in volume and lighter in weight, thereby facilitating the attachment and detachment of the radiation source. Furthermore, since the plurality of target points of each individual radiation source module can adopt individual vacuum cavities, the risk of ignition in the cavity during maintenance of the radiation source can be reduced.

[0119] According to some embodiments of the present application, an individual cavity of each radiation source module is provided with a mounting and positioning structure, which is used to fix the radiation source module in a relative position in the radiation scanning device, for example, to position the radiation source module relative to a support frame, and which also rotates the radiation source module around a predetermined axis to adjust the emission angle of the radiation beam. The mounting and positioning structure can also be used to determine the position of each radiation source module, thereby ensuring that the multiple radiation source modules of the radiation source are positioned in a plane (e.g., the same plane or different planes) perpendicular to the transport direction of the object after being mounted.

[0120] Here, optionally, the radiation source modules may be distributed multi-point radiation sources, forming a ring structure, such as a rectangular ring, a polygonal ring, or an elliptical ring, surrounding the scanning region. Specifically, the radiation source modules may be linearly distributed multi-point radiation sources, and each radiation source module may include multiple target points, and the multiple radiation source modules may be distributed above, below, left, and right sides of the scanning region to form a rectangular ring surrounding the scanning region. Ends of the radiation source modules may be directly connected to form a rectangular ring, or may be spaced apart to form discontinuous rectangular rings. According to other embodiments, the radiation source may further include a plurality of shorter linearly distributed multi-point radiation sources, where the plurality of shorter linearly distributed multi-point radiation sources and the plurality of longer linearly distributed multi-point radiation sources are alternately arranged and directly connected end to end to form a continuous polygonal arrangement, or where the plurality of shorter linearly distributed multi-point radiation sources are alternately arranged and directly connected end to end to form a continuous rounded rectangular arrangement, or where the plurality of longer linearly distributed multi-point radiation sources are alternately arranged and directly connected end to end to form a continuous rounded rectangular arrangement, or where the plurality of longer linearly distributed multi-point radiation sources are alternately arranged and directly connected end to end to form a continuous rounded rectangular arrangement, or where the radiation source may further include other numbers, shapes and / or lengths of radiation source modules to form other polygonal structures, elliptical structures, etc.

[0121] Also, each radiation source module of the radiation source may be a single-point radiation source group, and each single-point radiation source group includes at least two single-point radiation sources, and optionally, the multiple single-point radiation source groups of the radiation source are distributed at a bottom field angle, a left field angle, a right field angle, a top field angle and a corner oblique field angle surrounding the scanning area, to form a multi-field angle array.

[0122] In another embodiment, the radiation source modules may be arranged to surround the scanning area on three sides, such as on the upper, left, and right sides, or on the upper, lower, left, or right sides (it should be noted that in this specification, the upper, lower, left, and right sides of the scanning area refer to the upper, lower, left, and right sides when viewing the scanning area along the object transport direction). Accordingly, the radiation sources may be arranged in a non-closed structure that surrounds the scanning area and has an opening on one side, such as a rectangular structure, a polygonal structure, or an elliptical structure that has an opening on one side. More specifically, the radiation sources may be arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal structure, a discontinuous rounded rectangle, other polygonal and elliptical structures, etc. that surround the scanning area and has an opening on one side. When the radiation source is a single-point radiation source, correspondingly, a single-point radiation source does not need to be provided on one side of the scanning area.

[0123] In the radiation scanning device of the present application, the detector has a structure surrounding the scanning area, formed by connecting the ends of multiple detector sets to each other. Optionally, in accordance with the above-mentioned various radiation source arrangement methods, for example, a structure surrounding the scanning area in four directions (top, bottom, left, and right), or a non-sealed structure opening to one side of the scanning area, such as a rectangular structure, a polygonal structure, or an elliptical structure (more specifically, a continuous or discontinuous rectangular structure, a continuous or discontinuous polygonal structure, a continuous or discontinuous rounded rectangular structure, and an arrangement of multiple viewing angles of a single-point radiation source, etc.), the multiple detector groups of the detector are arranged in a closed rectangular structure, square structure, polygonal structure, or elliptical structure surrounding the scanning area. Specifically, each detector group of the detector may include multiple detector units and a detector arm, and the multiple detector units are linearly arranged in the detector arm. The detector includes four detector groups arranged on the top, bottom, left, and right sides of the scanning area to form a closed rectangular or square structure surrounding the scanning area. The detector may also include multiple long detector groups and multiple short detector groups to form a closed polygonal structure surrounding the scanning area. Alternatively, according to another embodiment, the multiple detector groups of the detector may be arranged to surround a non-sealed structure that is open on one side of the scanning area, such as a rectangular, square, polygonal, or elliptical structure that is open on one side, in accordance with the non-sealed structure that opens on the scanning area side of the radiation source.

[0124] According to some embodiments, the multiple detector groups of the detector are individually detachable. This allows each detector group to be detached and attached individually, facilitating maintenance of the detectors. Furthermore, the multiple detector groups of the detector are configured to be detached by moving in the transport direction of the test object. Alternatively, when the radiation source is arranged in a non-sealed structure that surrounds the scanning region and has an opening on one side, some of the multiple detector groups of the detector are configured to be detached by moving in a direction perpendicular to the transport direction of the test object, and other parts are configured to be detached by moving in the transport direction of the test object. This allows the detector groups to be detached and attached or maintained without removing the radiation source module, improving the workability of attaching, detaching, and maintaining the detectors, even when the detectors are arranged inside the radiation source in a direction perpendicular to the transport direction of the test object.

[0125] In addition, according to some embodiments, the attachment and detachment of the detector group can be accomplished by linear movement between the detector arm of the detector group and its mounting portion on the radiation scanning device, for example, by linear sliding or linear rolling movement between the detector arm and the support frame of the radiation scanning device, for example, by engagement of a slider guide rail installed between the detector arm and the support frame, or engagement of a linear ball bearing with a cylindrical shaft, etc.

[0126] According to some embodiments, each detector unit of a detector group includes a detector crystal for receiving radiation, and the detector crystals of each detector unit of each detector group are arranged on the detector arm facing the same direction. As described above, in the present application, each detector group is located in a plane perpendicular to the transport direction of the object, particularly in the same plane, and more specifically, the detector crystals of each detector group are located in the same plane perpendicular to the transport direction of the object. According to other embodiments, each detector group may be located in a different plane perpendicular to the transport direction of the object.

[0127] In the radiation scanning device of the present application, the radiation source according to any of the above embodiments is combined with the detector according to any of the above embodiments, and in the combined state, each radiation source module of the radiation source is located in a plane (in one or more planes) perpendicular to the transport direction of the object, each detector group of the detector is located in another plane (particularly in the same plane) perpendicular to the transport direction of the object, the detectors are located inside the radiation source in a direction perpendicular to the transport direction, and the radiation source and the detector are arranged to at least partially overlap in the transport direction of the object. By at least partially overlapping the radiation source and the detector in the transport direction of the object, the arrangement length of the radiation source and the detector can be reduced, which is advantageous for reducing the length of the entire radiation scanning system.

[0128] In some embodiments, each detector group of the detectors is positioned so as not to block the radiation beam of the radiation source module on the same side, and can simultaneously receive radiation from each radiation source module on the remaining side, thereby allowing different radiation source modules to share the same detector group and reducing the total number of detectors.

[0129] In some embodiments, the detector crystals of each detector group of the detectors are arranged at an end of the detector unit along the object transport direction and close to the edge of the radiation beam of the radiation source module on the same side in the object transport direction, but not blocking the radiation beam of the radiation source module on the same side, thereby minimizing the covering length of the optical path between the radiation source and the detector, and further reducing the length of the device.

[0130] In some embodiments, each radiation source module is arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystal of the detector group on the opposite side. More specifically, the radiation source module can rotate about a predetermined axis, such as a target axis (for example, via the mounting and positioning structure of the radiation source module), and the beam exit angle of the radiation beam can be adjusted to irradiate the detector crystal of the detector group on the opposite side at the center position of the radiation beam of the radiation source module. Since the detector crystal of the detector is located at the end of the detector unit in the transport direction of the object and is arranged close to the edge of the radiation beam of the radiation source on the same side, the radiation source module can irradiate the detector crystal at the center position of the radiation beam by only rotating it by a small angle, thereby minimizing the adverse effect on imaging caused by the radiation beam being incident on the crystal surface of the detector at an oblique angle. The adjustment of the beam exit angle of the radiation source can be achieved by setting the aperture direction of the radiation source module, adjusting a collimator, or other appropriate methods.

[0131] According to some embodiments, the image processing module of the radiation scanning device of the present application is configured with a data compensation function that can compensate for missing data in the field of view and / or repair the reconstructed image to improve image quality. Specifically, the image processing module is arranged to perform image reconstruction using an iterative method, an image repair method, or a combination of both, thereby compensating for missing projection data due to increased spacing between target points at the ends of adjacent radiation source modules and improving the quality of the reconstructed image.

[0132] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0133] FIG. 1 schematically illustrates a radiation scanning device according to some embodiments of the present application. The radiation scanning device illustrated in FIG. 1 includes a transport device 1, a passageway 2, a radiation source 3, a detector 4, and a support frame 5. The transport device 1 is used to transport a subject 6 through a scanning region defined by the radiation source 3 and the detector 4. The subject 6 is driven by the transport device 1 to enter the passageway 2 from an opening at one end and leave the passageway 2 from an opening at the other end. The passageway 2 may shield radiation from the radiation source 3 from the external environment, avoiding radiation damage to persons near the device and limiting the volume of the subject 6 entering the passageway 2. The radiation source 3 is fixed to the support frame 5 outside the passageway 2 and emits a radiation beam to irradiate the subject 6 during a scanning period. The detector 4 is also fixed to the support frame 5 outside the passageway 2 and detects radiation transmitted through the subject 6 during a scanning period. The support frame 5 supports and fixes devices such as the transport device 1, the passage 2, the radiation source 3, and the detector 4, and is fixed to the ground. Note that the radiation source 3 and the detector 4 are both located outside the passage 2, but in the scanning area, a retreat area is provided in the passage 2, which does not block the radiation beam of the radiation source 3 or prevent the detector 4 from receiving radiation.

[0134] The radiation scanning device according to the embodiment of the present application may further include a control device capable of controlling the operation of each component of the radiation scanning device, such as the emission of radiation from the radiation source 3, the data output from the detector 4, etc. The control device may further include an image processing module capable of performing image reconstruction based on the information output from the detector 4 to obtain a scanned image of the subject 6.

[0135] The transport device 1 may be, for example, a conveyor, and the subject 6 may be, for example, an item such as a package or baggage that requires various types of security inspection.

[0136] The radiation source 3 may include multiple radiation source modules arranged around the scanning region and positioned in a plane perpendicular to the transport direction of the object 6. The radiation source modules may be arranged in the same plane perpendicular to the transport direction of the object 6 or in different planes. This embodiment will be described as an example in which the radiation source modules are positioned in the same plane perpendicular to the transport direction of the object 6 (specifically, the radiation apertures of the radiation source modules are positioned in the same plane perpendicular to the transport direction of the object 6). However, the present invention is equally applicable to the case in which the radiation source modules are positioned in different planes. FIG. 1 shows the traveling direction Z of the object 6, and the transport direction of the object 6 (hereinafter, sometimes simply referred to as the transport direction or the Z direction) is defined as the traveling direction of the object 6, including the opposite direction to the traveling direction. FIG. 1 also shows an XYZ coordinate system, and the positions of components in the radiation scanning device can be described using this XYZ coordinate system as a reference coordinate system. These position descriptions are used to clearly explain the principles of the present application, but are not limited thereto. The traveling direction Z of the object 6 is the same as the Z direction of the XYZ coordinate system.

[0137] According to some embodiments, each radiation source module of the radiation source 3 of the radiation scanning equipment according to the embodiments of the present application may be a distributed multi-point radiation source, and the multiple radiation source modules may be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area, and part of the structure is located below the conveying device 1 so as to completely surround the conveying device 1.

[0138] Specifically, as a distributed multi-point radiation source, each radiation source module may have multiple target points, and each target point of each radiation source module can generate a radiation beam individually, and each target point can generate a radiation beam at a predetermined timing under the control of the control device. As shown in Figure 3, the radiation beam may be a fan beam with an opening angle A. Of course, the shape of the radiation beam is not limited to a fan beam, and may be a beam of other shapes such as a cone beam or a parallel beam, and may be specifically configured as needed.

[0139] The specific configuration of the radiation source 3 is as follows. Figure 2 shows a structural schematic diagram of a radiation source and detector according to some embodiments, in which multiple radiation source modules of the radiation source 3 are arranged in a rectangular structure surrounding the scanning area. Specifically, the radiation source 3 includes four radiation source modules 31, 32, 33, and 34, each of which is a linearly distributed multi-point radiation source (i.e., multiple target points are linearly arranged), and the four radiation source modules 31, 32, 33, and 34 are arranged above, below, left, and right of the scanning area, respectively, to form a rectangular structure surrounding the scanning area. The ends of the radiation source modules 31, 32, 33, and 34 are spaced apart by a certain distance, thereby forming a discontinuous rectangular structure (as shown in Figure 4(a) , the target points are similarly arranged in a discontinuous rectangle).

[0140] The arrangement of the radiation sources 3 is not limited to the embodiments shown in Figures 2 and 4(a) and may include several other alternative arrangements. For example, the radiation source modules 31, 32, 33, and 34 may be directly connected to each other at their ends, and the radiation sources 3 may be arranged around the scanning area in a continuous rectangular structure (as shown in Figure 4(b) , the target points are arranged in a continuous rectangle). In addition to the embodiment shown in Figure 2, the radiation source 3 may further include four other linearly distributed radiation source modules 35, 36, 37, and 38, which are shorter than the radiation source modules 31, 32, 33, and 34, and which are arranged alternately with and directly connected at their ends to the radiation source modules 31, 32, 33, and 34, so that the radiation sources 3 are arranged in a continuous polygonal structure (as shown in Figure 4(c) , the target points are arranged in a continuous polygonal structure). Alternatively, the radiation source modules 35, 36, 37, 38 may be arranged alternately with the radiation source modules 31, 32, 33, 34 and directly connected at their ends to form an arc-shaped distributed radiation source, such that the radiation source 3 is arranged in a continuous rounded rectangular structure. Of course, the ends of the radiation source modules 31, 32, 33, 34, 35, 36, 37, 38 may be spaced apart at a certain distance so that the radiation source 3 is arranged in a discontinuous polygonal structure or a discontinuous rounded rectangular structure (not shown). Alternatively, the length of the radiation source modules 35, 36, 37, 38 may be the same as or longer than the length of the radiation source modules 31, 32, 33, 34, or the radiation source 3 may include other numbers and / or lengths of radiation source modules, thereby forming a polygonal structure different from the polygon shown in FIG. 4(c). The radiation source 3 may also include other numbers, lengths and / or shapes of radiation source modules, thereby forming an ellipsoidal shaped structure.

[0141] In some embodiments, the radiation source modules included in the radiation source 3 are individually detachable from each other, i.e., each radiation source module has its own cavity for accommodating its own radiation generating device. Having each radiation source module with its own cavity means that the target points of each radiation source module share a separate vacuum cavity. The spacing between the target points of each radiation source module within the vacuum cavity can be determined by the number of target points and the length of the cavity. According to some embodiments, the number of target points in an individual radiation source module may be 192, 264, etc., and the spacing between the target points in an individual radiation source module may be 4 mm, 12 mm, etc. Note that the spacing between the target points at the ends of adjacent radiation source modules is greater than the spacing between the target points within an individual radiation source module, even if the ends of adjacent radiation source modules are directly connected, i.e., two separate cavities are directly connected. The advantage of each radiation source module having its own cavity is that, compared to a radiation source with an integral annular cavity (i.e., all target points of the radiation source are located in the same annular vacuum cavity), the housing size of the individual radiation source module and the volume of the internal vacuum cavity can be reduced, and the volume and weight of the individual radiation source module can be reduced, making it convenient to remove and install the radiation source; and each radiation source module employs its own vacuum cavity, which reduces the risk of ignition in the cavity when performing maintenance on the radiation source module.

[0142] Furthermore, according to some embodiments, each radiation source module of the radiation source 3 is provided with a mounting and positioning structure for mounting and adjusting the radiation source module. Through the mounting and positioning structure, each radiation source module of the radiation source 3 can be mounted and fixed at a predetermined position in the radiation scanning equipment (e.g., a specific position relative to an XYZ reference coordinate system in an X-ray scanning device), for example, ensuring that the multiple radiation source modules are positioned in the same plane perpendicular to the transport direction of the object 6. Furthermore, the radiation source module may be rotated by the mounting and positioning structure to adjust the beam emission angle of the radiation beam.

[0143] Each radiation source module of the radiation source 3 may adopt different mounting methods and have different mounting positioning structures depending on its position in the radiation scanning device. For example, the radiation source modules located above and to the sides of the scanning area may be mounted in a hanging manner via equipment such as the ceiling. However, the radiation source modules located below the scanning area are not suitable for the hanging method and must be mounted in a different manner. To facilitate the mounting of such radiation source modules, the embodiments of the present application provide a mounting positioning structure, which can easily mount and fix the radiation source modules that are not suitable for hanging at a predetermined position in the radiation scanning device, and can rotate the radiation source modules to adjust the emission angle of the radiation beam. According to some embodiments, the mounting and positioning structure includes a body fixedly connected to the radiation source module and to the support frame of the radiation scanning equipment such that the radiation source module is fixedly mounted to the support frame by the body, and the mounting and positioning structure includes a moving device by which the radiation source module can be moved to a predetermined mounting position on a first plane (e.g., the XZ plane in Figure 1 ), a first positioning device for positioning the radiation source module in the first plane, a lifting device for adjusting the position of the radiation source module along a first direction perpendicular to the first plane (e.g., the Y direction in Figure 1 , a direction perpendicular to the XZ plane), and a second positioning device for fixing the position of the radiation source module in the first direction.

[0144] FIG. 5 shows a specific embodiment of the mounting and positioning structure for the radiation source module. As shown in FIG. 5, the mounting and positioning structure includes a main body 11 and a main body 12, which are located at both ends of the radiation source module along the longitudinal direction and are fixedly connected to the radiation source module. (Here, the radiation source module is described as the radiation source module 33 of the radiation source 3 in FIG. 2 by way of example, but may be any other suitable radiation source module.) The radiation source module 33 is fixedly mounted to the support frame 5 (not shown in FIG. 5) via the main body 11 and the main body 12. The moving device for mounting the positioning structure specifically includes rollers 13 and 14, respectively, which are installed on the main body 11 and the main body 12. The radiation source module 33 can be moved to a predetermined mounting position in the XZ plane by being pushed by the rollers 13 and 14. Of course, the moving device for mounting the positioning structure is not limited to rollers. In other embodiments, the radiation source module may be moved by a sliding mechanism. For example, a linear sliding engagement may be provided between the mounting and positioning structure and the support frame 5, thereby moving the radiation source module 33 to a predetermined mounting position.

[0145] The first positioning device has first positioning pins 15, 16 and corresponding first pin holes (not shown) provided in the main body 11, 12 and the support frame 5 of the radiation scanning equipment, and after the radiation source module 33 is moved to a predetermined mounting position via the rollers 13, 14, the first positioning pins 15, 16 can be inserted into the corresponding first pin holes to position the radiation source module 33 in the XZ plane.

[0146] The lifting device includes rollers 13 provided on the main body 11. Specifically, the rollers 13 are provided as elevatable rollers, and further include a wire rope 17 provided on the main body 12. One end of the wire rope 17 abuts against the support frame 5, and the wire rope 17 is screwed in, thereby lifting and lowering the main body 12 and the radiation source module 33 relative to the support frame 5. By adjusting the elevatable rollers 13 and the wire rope 17, the position of the radiation source module 33 relative to the support frame 5 can be adjusted along the Y direction. The second positioning device is formed as positioning blocks 19 and 20. After adjusting the elevatable rollers 13 and the wire rope 17, the radiation source module 33 can be adjusted to a predetermined position along the Y direction. The positioning blocks 19 and 20 can then be placed below the main bodies 11 and 12, respectively, to fix the height of the radiation source module 33 relative to the support frame 5, thereby positioning the radiation source module 33 in the first direction Y. Here, in some examples, the positioning block 20 below the main body 12 may be U-shaped, and the lower parts of the wire ropes 17 may be located in the openings of the U-shaped positioning block 20 so as not to interfere with each other. The mounting and positioning structure may further include first fixing bolts 21, 22 and corresponding first screw holes provided in the main bodies 11, 12, the positioning blocks 19, 20, and the support frame 5. By inserting and tightening the first fixing bolts 21, 22 into the corresponding first screw holes, the positioning blocks 19, 20 can be fixed to the main bodies 11, 12 and the support frame 5, and the radiation source module 33 can be fixedly connected to the support frame 5.

[0147] According to some embodiments, the mounting and positioning structure further includes an adjusting device for rotating the radiation source module along a predetermined axis to adjust the emission angle of the radiation source module. According to the specific embodiment of Fig. 5, the radiation source module 33 is provided with a mounting shaft 331, and the main bodies 11 and 12 are each provided with an axial hole, and the main bodies 11 and 12 are mounted on the mounting shaft 331 through the axial holes. The mounting and positioning structure further includes second positioning pins 23 and 24, and the main bodies 11 and 12 and the radiation source module 33 are each provided with second pin holes corresponding to the second positioning pins 23 and 24. The axial holes of the main bodies 11 and 12 are engaged with the mounting shaft 331, and the second positioning pins 23 and 24 are inserted into the corresponding second pin holes, thereby positioning the main bodies 11 and 12 relative to the radiation source module 33. The mounting and positioning structure further includes second fixing bolts 25, 26 for fixing the connecting bodies 11, 12 to the radiation source module 33, and corresponding second screw holes provided in the bodies 11, 12 and the radiation source module 33. By screwing the second fixing bolts 25, 26 into the corresponding second screw holes, the bodies 11, 12 can be fixedly connected to the radiation source module 33. By pulling out the second positioning pins 23, 24 and loosening the second fixing bolts 25, 26, the bodies 11, 12 can be unclamped from the radiation source module 33. In this state, the adjusting device can be driven to rotate the radiation source module 33 about the mounting axis 331 relative to the bodies 11, 12.

[0148] In a specific embodiment, the adjustment device includes a rotation drive mechanism, which includes an adjustment block 27 fixed to the radiation source module 33 and a set screw 28 provided on the main body 11 and abutting against the adjustment block 27. The set screw 28 is screwed in to push and move the adjustment block 27, thereby rotating the radiation source module 33. The rotation drive mechanism is provided on only one main body of the mounting and positioning structure, i.e., only one end along the longitudinal direction of the radiation source module 33. Both ends of the radiation source module 33 are supported by the mounting shaft 331, so that by pushing and rotating the radiation source module 33 at one end of the radiation source module 33, the entire radiation source module 33 can be rotated accordingly. After rotating the radiation source module 33 by a predetermined angle, the second positioning pins 23, 24 are again inserted into the corresponding second pin holes, and the second fixing bolts 25, 26 are again screwed into the corresponding second screw holes, thereby fixedly connecting the main bodies 11, 12 to the radiation source module 33.

[0149] In the above embodiment, the mounting axis 331 of the radiation source module 33 can overlap with the virtual lines of multiple target points of the radiation source module 33, so that by rotating the radiation source module 33 around the mounting axis 331, the radiation source module 33 can be rotated around the target axis.

[0150] Although the mounting and positioning structure of the above embodiment has been described using the radiation source module 33 of the radiation source 3 in FIG. 2 as an example, the mounting and positioning structure can be applied to the mounting, positioning, and adjustment of any suitable radiation source in a radiation scanning device. Of course, the mounting, positioning, and adjustment of the radiation source module 33 of the radiation source 3 in FIG. 2 are not limited to the mounting and positioning structure of the above embodiment, and any other suitable structure may be adopted. For example, in the embodiment shown in FIG. 5, the lifting device is realized by the elevatable rollers 13 and the wire rope 17. However, the lifting device is not limited to the specific structure of the embodiment, and may be realized as other suitable structures, for example, by using a wire rope for lifting both bodies. Similarly, the specific implementations of the moving device, the first positioning device, the second positioning device, and the adjusting device are not limited to the specific structures of the above embodiment, and may be realized as other suitable structures as long as they can achieve their functions.

[0151] In the above embodiment, the radiation source module of the radiation source 3 of the radiation scanning device shown in Figure 1 is a distributed radiation source. Alternatively, the radiation source 3 may be composed of a plurality of single point radiation source groups, each of which includes at least two single point radiation sources. Each single point radiation source can individually transmit a radiation beam, for example, a fan beam (shown in Figure 3) with an opening angle A. Each single point radiation source of the radiation source 3 can emit radiation at a predetermined timing under the control of a control device of the radiation scanning system. Figure 4(d) shows a layout of a radiation source including a plurality of single radiation source groups according to some embodiments. As shown in (d) of Figure 4, the radiation source includes a plurality of single point radiation source groups arranged at the bottom field angle, left field angle, right field angle, top field angle and corner oblique field angle surrounding the scanning area, wherein the point single radiation source group at the bottom field angle includes three single point radiation sources, arranged at the left bottom field angle, the middle bottom field angle and the right bottom field angle, respectively; the point single radiation source group at the top field angle includes three single point radiation sources, arranged at the left top field angle, the middle top field angle and the right top field angle, respectively; the single radiation source group at the left field angle includes two single point radiation sources, arranged at the upper left field angle and the lower left field angle, respectively; the single radiation source group at the right field angle includes two single point radiation sources, arranged at the upper right field angle and the lower right field angle, respectively; and the single radiation source group at the corner oblique field angle includes four single point radiation sources, arranged at the upper left oblique field angle, the upper right oblique field angle, the lower left oblique field angle and the lower right oblique field angle, respectively. According to other embodiments, each single point radiation source group may include more single point radiation sources. Similarly, each single point radiation source includes a respective mounting and positioning structure for mounting and positioning the single point radiation source, so that the multiple single point radiation sources are located in the same plane perpendicular to the transport direction of the object 6. The mounting and positioning structure is also used to rotate the single point radiation source to adjust the beam emission angle of the beam of each single point radiation source.

[0152] Next, the configuration of the detector 4 of the radiation scanning device shown in FIG. 1 will be described in detail. The detector 4 has multiple detector groups in a plane perpendicular to the transport direction of the subject 6, and the ends of each detector group are connected to each other so as to surround the scanning area. The multiple detector groups may be located in the same plane perpendicular to the transport direction of the subject 6 or in different planes, or may be provided in the same plane. In this embodiment, the detector groups are located in the same plane as an example, but the same applies to the case of different planes. Specifically, each detector group of the detector 4 is a detector array including multiple detector units, and the multiple detector groups may be arranged in a closed square, rectangular, polygonal, or elliptical structure surrounding the scanning area, with a portion of the structure located below the transport device 1 so as to completely surround the transport device 1.

[0153] FIG. 2 illustrates a detector arrangement according to some embodiments. The detector 4 includes four detector groups 41, 42, 43, and 44. Each detector group 41, 42, 43, and 44 is a linear detector array including multiple detector units arranged along a straight line. The four detector groups 41, 42, 43, and 44 are arranged on the four sides of the scanning area, and their ends are connected to each other to form a closed rectangular structure (as shown in FIG. 6(a)) or a square structure. The arrangement of the detector 4 is not limited to the embodiments illustrated in FIGS. 2 and 6(a) and may instead be arranged in other configurations. For example, the detector 4 may include four long linear detector arrays and four short linear detector arrays, which are alternately arranged around the scanning area and whose ends are connected to each other to form a closed polygonal structure (as shown in FIG. 6(b)). Detector 4 may include other numbers of long linear detector arrays and other numbers of short linear detector arrays that are arranged alternately around the scan area and joined end to end to form a closed polygonal structure. Detector 4 may also include other numbers, lengths, and / or shapes of detector groups to form other shapes of enclosed structures, such as elliptical structures.

[0154] A detector group in the form of a linear detector array may have any appropriate structure, and according to some embodiments, a specific structure thereof may be shown in FIG. 7. As shown in FIG. 7, the detector group includes a plurality of detector units 45 and a detector arm 46. The plurality of detector units 45 are arranged side by side in a straight line in the detector arm 46. Of course, the specific structure of the detector unit 45 may also have other appropriate structures, as shown in FIG. 8. As shown in FIG. 8, the detector unit 45 includes a detector crystal 451 for receiving radiation. The plurality of detector units 45 are arranged side by side in the detector arm 46 with the detector crystals 451 facing the same direction. The structure of the detector arm 46 is not limited to the embodiment shown in FIG. 7, and other appropriate structures (detector arm structures shown in FIGS. 9 and 15-17) may also be used. The detector group of the present application is not limited to the form of a linear detector array, but may also have the form of an arc-shaped detector array to form a detector with an elliptical structure. The arc-shaped detector array includes a plurality of arc-shaped detector units and an arc-shaped detector arm, the plurality of arc-shaped detector units are arranged side by side on the arc-shaped detector arm, and the detector crystals of the detector units face in the same direction.

[0155] According to some embodiments, each detector group of the detector 4 is individually detachable, thereby improving the maintainability of the detector. Also, in some examples, multiple detector groups of the detector 4 can be detached, attached, and adjusted along the transport direction of the object 6, so that when the detector 4 is arranged inside the radiation source 3 along the transport direction perpendicular to the object 6, the detector groups can be detached, adjusted, and maintained without the need to remove the radiation source, thereby further improving the maintainability of the detector.

[0156] Specifically, with the mounting and fixing structure of the detector group of the present application, the detector group of detector 4 can be removed from or mounted to the mounting position (e.g., support frame 5) in the radiation scanning equipment by moving along the transport direction of the subject 6 relative to the mounting position.

[0157] Hereinafter, a mounting and fixing structure for a detector group according to some embodiments of the present application will be described in detail. The mounting and fixing structure for a detector group according to some embodiments of the present application specifically includes a first mounting part, a second mounting part, and a fixing device, the first mounting part is fixedly installed on the detector group, the second mounting part is fixedly installed on a support frame of a radiation scanning device and moves in accordance with the linear movement of the first mounting part, wherein the detector group can move to a predetermined mounting position along the second mounting part with the first mounting part and the second mounting part engaged with each other, and the fixing device is provided on one side along the width direction of the detector group and is used to fix the detector group to a mounting reference surface of the support frame. In some specific embodiments, the detector group is attached and fixed to a support frame of the radiation scanning equipment via a detector arm, wherein the first attachment portion is fixedly attached to the detector arm of the detector group, and the fixing device is provided on one side along the width direction of the detector arm, and fixes the detector group by fixing the detector arm to the support frame.

[0158] 9 shows a mounting and fixing structure for a detector group according to some specific embodiments, in which (a) of FIG. 9 is an exploded perspective view of a detector arm and the mounting and fixing structure, and (b) of FIG. 9 is a partial cross-sectional view of the detector arm in the mounted and fixed state of the detector group. In FIG. 9, the complete detector group is not shown, but only the detector arm is shown, and multiple detector units may be arranged side by side in the longitudinal direction on the shown detector arm to form a complete detector group.

[0159] As shown in FIG. 9 , the first mounting portion of the detector group mounting and fixing structure is specifically formed as a slide groove 471 extending in the width direction of the detector arm 47. When the detector arm 47 is mounted on the support frame 5 of the radiation scanning device, the width direction of the detector arm 47 coincides with the direction of transport of the subject 6. The second mounting portion is formed as a slide rod 472 that engages with the slide groove 471. The slide groove 471 is formed as a semicircular opening slide groove, and the slide rod 472 is formed as a corresponding cylindrical slide rod. The slide rod 472 is fixed to the support frame 5 or formed integrally with the support frame 5, and its longitudinal direction coincides with the direction of transport of the subject 6. One end of the slide rod 472 closer to the support frame 5 is larger than the other portion of the slide rod 472, forming a protrusion 473. The end surface of the protrusion 473 facing the detector arm 47 serves as a mounting reference surface 474 that abuts against an end surface 475 along one side of the detector arm 47 in the width direction. The surface 475 is a mounting surface for the detector arm 475, and is processed to have good flatness together with the mounting reference surface 474. When the mounting surface 475 of the detector group abuts against the mounting reference surface 474 and is positioned, the detector group can be accurately positioned in the width direction, i.e., the transport direction of the subject 6. The convex portion 473 also functions as a position restricting portion, and when the detector group is to be mounted, the slide groove 471 is aligned with the slide rod 472, and the detector arm 47 is pushed along the slide rod 472 toward the support frame 5, and the detector arm 47 can be moved to a predetermined mounting position until the detector arm 47 abuts against the convex portion 473.

[0160] The fixing device is provided at the other end of the slide rod 472 facing the protrusion 473, and is arranged to abut on both sides of the detector arm 471 in the width direction together with the protrusion 473, thereby defining the position of the detector arm 471 in the width direction. Specifically, the fixing device includes a positioning sleeve 476 and a fastener 477. The positioning sleeve 476 is fitted onto the other end of the slide rod 472 facing the protrusion 473, and abuts against a surface 478 on the other side in the width direction of the detector arm 47, and the fastener 477 fixes the positioning sleeve 476 to the other end of the slide rod 472 facing the protrusion 473. Specifically, the fastener 477 may be a fastening screw, and threaded holes are provided in both the positioning sleeve 476 and the other end of the slide rod 472, and the fastening screw is screwed into the threaded hole to tighten the positioning sleeve 476 relative to the slide rod 472, thereby fixing the detector arm 47 in the width direction relative to the slide rod 472 (i.e., the support frame 5). At the same time, the shape of the slide rod 472 matches the shape of the slide groove 471, restricting other degrees of freedom, so that the detector arm 47 can be perfectly positioned and fixed.

[0161] When attaching the detector group using the above-described attachment and fixing structure, first, with the detector unit facing the scanning region and with its width direction coinciding with the transport direction of the subject 6, the slide groove 471 of the detector arm 47 is aligned with the slide rod 472, and the detector arm 47 is moved along the slide rod 472 until it abuts against the convex portion 473, and then the positioning sleeve 476 is fitted onto one end of the slide rod 472 facing the convex portion 473 and fixed to the slide rod 472 with a screw, thereby fixing the detector arm 47. To remove the detector group, the reverse operation is performed.

[0162] According to the above-mentioned mounting and fixing structure, the slide rod 472 extends along the transport direction of the subject 6, i.e., along the transport direction of the subject 6 due to linear movement engagement between the detector group and the support frame 5, and the fixing device is provided on one side of the detector group along the width direction, which coincides with the transport direction of the subject 6. Therefore, with the above-mentioned mounting and fixing structure, the detector group can be moved in the transport direction of the subject 6 to be attached and detached, and fastening work can be performed on one side of the detector group along the transport direction of the subject. Therefore, the detectors can be attached and detached or maintained from the side along the transport direction of the subject. Even if the detector is arranged inside the radiation source along a direction perpendicular to the transport direction, the attachment and detachment or maintenance can be performed without disturbing the radiation source, thereby improving the convenience of attachment and detachment and maintenance of the detectors.

[0163] Optionally, the second mounting portion of the mounting and fixing structure may be configured to support the detector group at a predetermined mounting position while engaged with the first mounting portion. Specifically, the second mounting portion includes two slide rods 472, and the detector arm 47 has two corresponding slide grooves 471 formed therein, which are provided at both ends of the detector arm 47 along its longitudinal direction. This allows the two slide rods 472 to support the detector group at the predetermined mounting position after the detector arm 47 is moved to the predetermined mounting position by the two slide rods 472, without requiring any additional auxiliary structure and / or tools. In this way, the detector group can be tightened without the need for any extra tools and when the operator does not need to support the detector group, improving operability.

[0164] In Figure 9, the detector arm is shown in a vertical direction, but the above mounting and fixing structure is not limited to being used only for attaching and detaching a detector group arranged vertically in a radiation scanning device, and the above mounting and fixing structure may be used for detector groups arranged in other directions.

[0165] Of course, the mounting and fixing structure between the detector group and the support frame 5 is not limited to the embodiment shown in FIG. 9, and other suitable mounting and fixing structures may be adopted. For example, according to some embodiments, the linear movement engagement of the mounting and fixing structure may be other suitable engagement, for example, a linear rolling engagement such as engagement between a linear ball bearing and a cylindrical shaft. According to some other embodiments, the cross section of the slide groove 471 is not limited to a semicircular shape, but may be a shape such as a semirectangular shape, and accordingly, the slide rod 472 is not limited to a cylindrical body, but may be a shape such as a square pillar that engages with the slide groove 471.

[0166] Furthermore, when the detector includes a plurality of detector groups, by providing the mounting reference surfaces of the plurality of detector groups in the same plane perpendicular to the transport direction of the test object 6, it is possible to ensure that the plurality of detector groups, after being mounted, are located in the same plane perpendicular to the transport direction of the test object 6. Specifically, when each detector group is mounted using the mounting and fixing structure shown in Fig. 9, the end faces of the protrusions 473 corresponding to each detector group facing the detector arms 47, i.e., the mounting reference surfaces 474, are located in the same plane perpendicular to the transport direction of the test object 6, and the mounting surfaces 475 along the width direction of each detector group are abutted against the respective mounting reference surfaces 474 and fixed, so that the plurality of detector groups, after being mounted, must be located in the same plane perpendicular to the transport direction of the test object 6.

[0167] The relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device according to the embodiment of the present application will be further described below. As described above, the radiation source 3 includes a plurality of radiation source modules, each of which is arranged around the scanning region and located on the same plane perpendicular to the direction of transport of the object 6. The detector 4 includes a plurality of detector groups, each of which is arranged on the same plane perpendicular to the direction of transport of the object 6, and the ends of each detector group are connected to each other and arranged around the scanning region. Furthermore, in the combined state of the radiation source 3 and the detector 4, the detector 4 is arranged inside the radiation source 3 in the direction perpendicular to the direction of transport of the object 6, and the radiation source 3 and the detector 4 are arranged to at least partially overlap in the direction of transport of the object 6. The plurality of radiation source modules of the radiation source 3 may be arranged in any of the above-mentioned embodiments, such as a rectangular structure, a polygonal structure, or an elliptical structure. The plurality of detector groups of the detector 4 may be arranged in any of the above-mentioned embodiments, such as a square structure, a rectangular structure, a polygonal structure, or an elliptical structure. Hereinafter, the detailed arrangement of the combined state of the radiation source 3 and the detector 4 will be described using the embodiment shown in FIG. 2 as an example. In FIG. 2, the four linearly distributed radiation source modules 31, 32, 33, and 34 of the radiation source 3 are arranged in a discontinuous rectangular structure, and the four linear detector arrays 41, 42, 43, and 44 of the detector 4 are arranged in a sealed rectangular structure. The detailed arrangement of the combined state described using FIG. 2 as an example can be similarly applied to any other combination of the radiation source 3 and the detector 4.

[0168] Optionally, each detector group 41, 42, 43, 44 of the detector 4 is arranged so as not to block the radiation beam of the radiation source module on the same side, and to receive radiation from each radiation source module on the remaining side. Since the radiation source 3 and the detector 4 are both arranged in a ring, the same detector group may be shared by different radiation source modules of the radiation source. Figure 10 shows the correspondence between each radiation source module and the detector group that receives its radiation, where the radiation beam of each target point of each radiation source module 31, 32, 33, 34 of the radiation source 3 is shown as a fan beam (a radiation beam having an opening angle A shown in Figure 3) as an example. The radiation beam emitted by each radiation source module 31, 32, 33, 34 can be detected by the three-way detector group of the detector 4, and the detector group and its part that can receive radiation are shown by thick solid lines. (a) of Figure 10 shows a detector group and its part corresponding to the radiation beam of radiation source module 31 above the scanning area, among which, detector group 42, 43, 44 of detector 4 receive the radiation beam from radiation source module 31; (b) of Figure 10 shows a detector group and its part corresponding to the radiation beam of radiation source module 32 on the right side of the scanning area, where detector group 41, 43, 44 of detector 4 receive the radiation beam from radiation source module 32; (c) of Figure 10 shows a detector group and its part corresponding to the radiation beam of radiation source module 33 below the scanning area, where detector group 41, 42, 44 of detector 4 receive the radiation beam from radiation source module 33; and (d) of Figure 10 shows a detector group and its part corresponding to the radiation beam of radiation source module 34 on the left side of the scanning area, where detector group 41, 42, 43 of detector 4 receive the radiation beam from radiation source module 34. As can be seen from FIG. 10, radiation from one radiation source module may be received by a detector group on another side other than the detector group on the same side, and different radiation source modules may share the same detector group, for example, radiation source modules 31 and 32 share detector groups 43 and 44, radiation source modules 32 and 33 share detector groups 41 and 44, radiation source modules 33 and 34 share detector groups 41 and 42, etc.In addition, radiation from each radiation source module can be detected by the detector group on the opposite side and can also be received by detector groups on other sides other than the detector on the same side, so that radiation from each radiation source module can be detected by as many detectors as possible. Therefore, the detector of the present application can reduce the number of detector groups and reduce equipment costs while improving image quality.

[0169] Optionally, the detector crystal of each detector group of the detector 4 is arranged at an end of the detector unit in the direction of transport of the object 6, and is arranged close to the edge of the radiation beam of the radiation source module on the same side in the direction of transport of the object 6, but not to block the radiation beam of the radiation source module on the same side. This makes it possible to minimize the covering length of the optical path between the radiation source and the detector, thereby reducing the length of the device. Specific examples are shown in Figures 11 and 12. Figure 11 is a diagram showing a cross-sectional structure of the centerline of the radiation scanning device shown in Figure 1 according to some embodiments, along the direction of transport of the object. 11, the detector unit may be, for example, the detector unit 45 shown in FIG. 7, and the detector crystal may be, for example, the detector crystal 451 shown in FIG. 7, where the surface of the detector crystal 451 is arranged parallel to the transport direction of the object 6 and is located at the end of the detector unit 45 along the transport direction of the object 6, and other members of the detector group, such as other elements and detector arms of the detector unit 45, are flush with the detector crystal 451 at the end of the detector unit 45, and all avoid the exit of the radiation beam of the radiation source on the same side. Also, FIG. 12 is a schematic plan view showing the layout of detectors and radiation sources according to some embodiments, where the radiation source modules on the left and right sides in the figure are radiation source modules 34 and 32 of the radiation source 3, respectively, and detector crystals 451-4 and 451-2 on the left and right sides represent the positions of the detector crystals of the detector group 44 and 42, respectively. 12, the detector crystal 451-4 is disposed close to the edge of the radiation beam of the radiation source module 34 on the same side in the transport direction of the object 6, and does not block the radiation beam of the radiation source module 34 on the same side. With this configuration, the radiation source 3 and the detector 4 can be overlapped to the maximum extent in the transport direction of the object 6, the covering length of the optical path between the radiation source and the detector can be shortened as much as possible, and the length of the equipment can be shortened.

[0170] In some examples, each radiation source module of the radiation source 3 is arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystal of the detector group on the opposite side. As shown in FIG. 12 , the radiation beam of the radiation source module 34 can avoid the detector group 44 on the same side and irradiate the detector crystal 451-2 of the detector group 42 on the opposite side, while irradiating the detector crystal 451-2. The radiation beam of the radiation source module 32 can avoid the detector group 42 on the same side and irradiate the detector crystal 451-4 of the detector group 44 on the opposite side. Furthermore, each radiation source module of the radiation source 3 is arranged so that the center position of the radiation beam irradiates the detector crystal of the detector group on the opposite side. Specifically, the radiation source module can rotate by a predetermined angle with respect to the target axis to adjust the beam emission angle of the radiation beam of the radiation source module, thereby allowing the detector crystal to be irradiated at the center position of the radiation beam. Here, the target axis refers to an imaginary line connecting multiple target points in the radiation source module. Since the detector crystal of the detector is located at the end of the detector unit in the transport direction of the object 6 and is disposed close to the edge of the radiation beam of the radiation source on the same side, the radiation source module can be rotated by a very small predetermined angle, for example, 1.5 degrees, and the detector crystal can be irradiated at the center of the radiation beam. This minimizes the adverse effects on imaging caused by the radiation beam being incident on the detector crystal surface at an angle. Furthermore, the rotation of the radiation source module is not limited to rotation around the target axis. The radiation source may be rotated around an axis other than the target axis to adjust the radiation beam output angle. The rotation of the radiation source around the target axis or another axis may be achieved by the mounting and positioning structure of the radiation source module. The method for adjusting the radiation beam output angle is not limited to the above embodiment. The radiation beam output angle may be changed by other methods, such as changing the aperture direction of the radiation source module, adjusting the collimator, or other appropriate methods, as long as the above-described arrangement of the radiation source can be realized.

[0171] In the radiation scanning device of the present application, the radiation source comprises a plurality of radiation source modules, and the ends of the plurality of radiation source modules are directly connected or spaced apart. When the ends of the radiation source modules are directly connected, the existence of a mechanical connection structure between the ends inevitably results in discontinuity of the radiation source points between adjacent radiation source modules. For example, the distance between the target points at the ends of two adjacent radiation source modules is significantly larger than the distance between the target points inside the radiation source modules, as occurs when the ends of the radiation source modules are spaced apart. As a result, during the scanning process, target points are missing at the ends of adjacent radiation source modules, resulting in missing projection data. In response to this, according to some embodiments, the image processing module of the radiation scanning device of the present application is configured to have a data compensation function that can compensate for missing data in the field of view and / or repair the reconstructed image to improve image quality. Specifically, the image processing module is configured to perform image reconstruction using an iterative method, an image restoration method, or a combination of both.

[0172] The iterative method specifically includes the following steps:

[0173] In step 1, image reconstruction is performed using missing field of view data, where the missing field of view data is initial data measured by a detector, and the initial data lacks projection data for field of view angles where there is no target point. For example, when a radiation scanning device uses a radiation source with a discontinuous rectangular structure as shown in Figure 2 or Figure 4(a), the initial data measured by the detector lacks projection data for oblique field of view angles at the four corners of the rectangular structure.

[0174] In step 2, the reconstructed image obtained in step 1 is subjected to forward reprojection according to complete geometry. Here, the reconstructed image obtained in step 1 may present an object with an incomplete geometric structure because it uses missing data from the viewing angle. Performing forward projection according to complete geometry refers to performing forward reprojection when the geometric shape is completely completed. Specifically, the geometric shape can be completely completed by methods such as inference and hypothesis.

[0175] In step 3, the reprojection data obtained in step 2 is used as a reference to restore the missing data in the projection area using an image restoration algorithm, and the restored data is used to reconstruct the image.

[0176] In step 4, the forward reprojection step, the view angle missing data repair step, and the image reconstruction step are repeated multiple times, and the image obtained in the final image reconstruction step is taken as the final reconstructed image.

[0177] In the above iterative method, a convergence threshold can be preset, and if the image acquired in the image reconstruction step satisfies the set convergence threshold, the iteration is stopped and the image is taken as the final reconstructed image, and if the image acquired in the image reconstruction step does not satisfy the set convergence threshold, the next iteration, i.e., the forward reprojection step, the view angle missing data repair step, and the image reconstruction step, is continued until the image acquired in the image reconstruction step satisfies the set convergence threshold.

[0178] In the above iterative method, the image restoration algorithm in step 2 includes various conventional algorithms, such as methods based on TV regularization, wavelet analysis, dictionary learning, etc., and artificial neural network methods.

[0179] In the above iterative method, the image reconstruction method includes a general algorithm such as an analytical algorithm and an iterative algorithm.

[0180] According to another embodiment, the image processing module can also use an image restoration method to obtain a reconstructed image. Specifically, the image processing module can perform image reconstruction using the missing data, i.e., the initial data measured by the detector, and then use an image restoration algorithm to perform artifact removal and data correction processing on the reconstructed image to obtain a final reconstructed image. In this embodiment, the image restoration algorithm can include various conventional algorithms, such as methods based on TV regularization, wavelet analysis, dictionary learning, and artificial neural network methods.

[0181] According to some other embodiments, the image processing module can perform image reconstruction using a combination of the iterative method and the image restoration method to improve image quality. Specifically, the image processing module first uses the iterative method to fill in missing data in the projection domain to obtain a reconstructed image that satisfies a set convergence threshold, and then uses the image restoration method to perform artifact removal and data correction processing on the reconstructed image obtained by the iterative method using an image restoration algorithm to obtain a final reconstructed image.

[0182] Compared to a radiation source using a distributed multi-point radiation source, the radiation source points using a radiation source in the form of a single point radiation source are relatively sparse, and the image processing module can obtain a scanned image using an image reconstruction algorithm applied to the sparse viewing angle data.

[0183] In the radiation scanning device of the above-mentioned embodiment, the radiation source surrounds the scanning area on all four sides, i.e., top, bottom, left, and right. According to another embodiment, the present application further provides a radiation scanning device, the layout of which is basically the same as that of the radiation scanning device of the above-mentioned embodiment, with the main difference being the layout of the radiation source, which surrounds the scanning area on only one side, i.e., the top, bottom, or left and right. In the following, an example in which the radiation source is located above, below, or right of the scanning area will be described, but the same applies to cases in which the radiation source is located above, below, or left of the scanning area.

[0184] Specifically, in the radiation scanning equipment of the above embodiment, each radiation source module of the radiation source 3 is a distributed multi-point radiation source, and the multiple radiation source modules may be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area. In this embodiment, the multiple radiation source modules of the radiation source may still be distributed multi-point sources, except that the multiple radiation source modules are arranged in a non-enclosed structure that opens to the left side of the scanning area of ​​the scanning area, such as a left-opening rectangular structure, a polygonal structure, an elliptical structure, etc., where the left side of the scanning area refers to the left side in the direction perpendicular to the transport direction of the object 6 in the scanning area. In the above embodiments, the radiation sources 3 are arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal or discontinuous rounded rectangle structure, and other polygonal and elliptical structures. Correspondingly, in this embodiment, the radiation sources are arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal or rounded rectangle structure, and other polygonal and elliptical structures that open to the left of the scanning region. For example, with respect to the radiation source shown in FIG. 2 , the radiation source 3 of this embodiment does not include at least the radiation source module 34 on the left side of the scanning region. For example, with respect to the radiation sources shown in FIGS. 4(b) to 4(c), the radiation source 3 of this embodiment does not include at least the radiation source module on the left side of the subject 6.

[0185] Similarly to the above-described embodiment, the radiation source of this embodiment may be composed of a group of multiple single-point radiation sources. The difference from the above-described embodiment is that the radiation source 3 of this embodiment does not include a single-point radiation source at the left field of view, or does not include single-point radiation sources at the left field of view, the upper-left oblique field of view, and the lower-left oblique field of view.

[0186] Except for the above differences, the other features of the radiation source of this embodiment are all the same as those of the radiation source 3 of the above embodiment.

[0187] The detector of this embodiment has basically the same features as detector 4 in the previous embodiment, except that in this embodiment, the detector is combined with radiation sources surrounding the scanning area only on the upper, lower, and right sides, and there is no radiation source module on the same side of the detector group located on the left side of the scanning area of ​​detector 4. Therefore, in addition to adopting the same method as in the previous embodiment for removing and installing each detector group of detector 4, the following different method from the above embodiment can be adopted to make the installation, removal, and maintenance of the detectors more convenient. Specifically, taking the combination of the detector group and radiation source shown in FIG. 13 as an example (here, the detector group is the same as the detector group shown in FIG. 2, and the radiation source lacks a radiation source module on the left side of the scanning area compared to the radiation source shown in FIG. 2), the detector 4 is attached so that the detector groups 41′, 43′, and 44′ are detachable from or attached to the support frame 5 in a direction perpendicular to the transport direction of the subject 6 (along the X direction as shown in FIG. 14), and the detector group 42′ is detachable from or attached to the support frame 5 along the transport direction of the subject 6 (along the Z direction as shown in FIG. 14).

[0188] The detector group 42' can be attached to and detached from the support frame 5 using a mounting and fastening structure (shown in FIG. 9) similar to that of the previous embodiment. However, the mounting and fastening structure of the previous embodiment is not suitable for attaching or detaching the detector groups 41', 43', and 44' along the X direction, so a different mounting and fastening structure is required. Specific examples of these mounting and fastening structures will be described in detail below.

[0189] Similar to the mounting and fixing structure of the above embodiment, the mounting and fixing structure suitable for attaching and detaching the detector groups 41', 43', 44' in the X direction specifically comprises a first mounting part, a second mounting part, and a fixing device, the first mounting part is fixedly installed on the detector group, the second mounting part is fixedly installed on the support frame of the radiation scanning equipment and engages with the linear movement of the first mounting part, wherein the detector group can move to a predetermined mounting position along the second mounting part with the first mounting part and the second mounting part engaged with each other, and the fixing device is provided on one side along the width direction of the detector group and is used to fix the detector group to a mounting reference surface on the support frame. In some specific embodiments, the detector groups 41', 43', 44' are attached and fixed to the support frame of the radiation scanning equipment via detector arms, wherein the first attachment portion is fixedly attached to the detector arm, and the fixing device is provided on one side along the width direction of the detector arm, and fixes the detector group by fixing the detector arm to the support frame.

[0190] 15 shows a mounting and fixing structure suitable for a detector group 41' according to some specific embodiments, in which (a) of Fig. 15 shows a perspective view of the detector group in an mounted state, (b) of Fig. 15 is a side view of the detector group in an mounted state, (c) of Fig. 15 is a perspective view of the detector group in a detached state, and (d) of Fig. 15 is a cross-sectional view of the detector group with the fixing device in an mounted state. As shown in Fig. 15, a first mounting portion of the mounting and fixing structure for the detector group 41' includes a slider 412 provided on a detector arm 411, and the slider 412 extends along the longitudinal direction of the detector arm 411, and when the detector group 41' is mounted on the radiation scanning device, the longitudinal direction of the detector arm 411 is perpendicular to the transport direction of the subject 6. 15, the slider 412 extends a portion of the length of the detector arm 411, in other embodiments the slider 412 may be provided to extend the entire length of the detector arm 411 or some other length. The slider 412 may also be secured to the detector arm 411 by a bolted connection or the like. According to other embodiments, the slider 412 may be integrally formed with the detector arm 411.

[0191] The second mounting portion is formed as a fixed rail 413 that engages with the slider 412. The fixed rail 413 is fixedly connected to a support frame 5 (not shown in FIG. 15) of the radiation scanning device, and may be molded integrally with the support frame 5. The longitudinal direction of the fixed rail 413 is perpendicular to the direction in which the subject 6 is transported in the radiation scanning device. A position restricting portion (not shown) is provided at one end along the longitudinal direction of the fixed rail 413, and when attaching the detector group 41', the slider 412 is aligned with the fixed rail 413, and the detector group 41' is pushed along the fixed rail 413 until the detector arm 411 abuts against the position restricting portion, thereby moving the detector group 41' to a predetermined attachment position.

[0192] The fixing device is provided on one side of the detector group 41′ in the width direction and abuts against a surface 414 on one side of the detector arm 411 in the width direction. Specifically, the fixing device includes a positioning member 415 and a fastener 416. The positioning member 415 is fixedly connected to the support frame 5, and an end face away from the support frame 5 is formed as a mounting reference surface 417. The mounting reference surface 417 is used to abut against the surface 414 on one side of the detector arm 411 in the width direction. The surface 414 is a mounting surface of the detector arm 411 that is machined to good flatness together with the mounting reference surface 417, and enables the detector group 41′ to be accurately positioned in the width direction when the mounting surface 414 of the detector arm 411 abuts against the mounting reference surface 417 and is fixed. The fastener 416 passes through the positioning member 415 and can tighten the detector group 41′ against the end face of the positioning member 415. Specifically, the fasteners 416 may be, for example, fastening bolts, and corresponding screw holes are provided on the side surfaces of the positioning member 415 and the detector arm 411 facing the positioning member 415, and the fastening bolts 416 are inserted into the corresponding screw holes and tightened, thereby making it possible to fasten the detector group 41′ to the end surface of the positioning member 415. A plurality of fixing devices, for example at least two fixing devices, are provided along the longitudinal direction of the detector group 41′, and the detector group 41′ can be firmly fixed to the support frame 5.

[0193] When attaching the detector group 41' using the above-described attachment and fixation structure, first, with the detector units of the detector group 41' facing downward, the sliders 412 on the detector group 41' are aligned with the fixed guide rails 413, the detector group 41' is moved along the fixed guide rails 413 until it abuts against the position regulating portions on the fixed guide rails 413, and then fasteners 416 are inserted into corresponding screw holes in the positioning member 415 and the detector arm 411 and tightened, thereby positioning the detector group 41' with respect to the end face of the positioning member 415, i.e., the attachment reference surface 417. To remove the detector group 41', the reverse operation is performed.

[0194] Because the longitudinal direction of the fixed guide rail is perpendicular to the direction in which the subject 6 is transported in the radiation scanning device and there is no obstruction of the radiation sources on the side of the detector group 41' along the X direction, the above-mentioned mounting and fixing structure allows the detector group 41' to be attached and detached to the support frame 5 in a direction perpendicular to the direction in which the subject 6 is transported in the radiation scanning device. Furthermore, because the fixing device is installed on one side of the detector group along its width direction, i.e., on one side of the detector along the Z direction, the detector group can be fastened without blocking the radiation sources, making it easy to attach, detach, and maintain the detector group.

[0195] Also, optionally, in the above mounting and fixing structure, the second mounting portion is arranged so as to support the detector group 41' at a predetermined mounting position when engaged with the first mounting portion. Specifically, the slider 412 is provided on both sides in the width direction of the detector arm 411, and has inner extension portions 4121 and 4122 extending inward from both edges in the width direction of the detector arm 411 (see FIG. 15(b)), and the fixed rail 413 has extension portions 4131 and 4132 extending outward along both opposing edges in the width direction (see FIG. 15(b)). When the slider 412 is fitted into the fixed rail 413, the inner extension portions 4121 and 4122 of the slider 412 are located above the extension portions 4131 and 4132 of the fixed rail 413, and the two are arranged in contact with each other and overlap each other. As a result, after the detector group 41' has moved to a predetermined mounting position along the fixed rail 413, the detector group 41' is suspended from the outer extension portions 4131, 4132 of the fixed rail 413 via the inner extension portions 4121, 4122 of the slider 412. In this way, the fixed rail 413 can support the detector group 41' at a predetermined mounting position, without requiring any other extra auxiliary structure or tool, and the worker does not need to support the detector group 41' when tightening the detector group 41', allowing the tightening operation to be performed, improving operational convenience.

[0196] The detector group 43' is attached and detached by combining a slider and a fixed rail, similar to the detector group 41'. Specifically, Fig. 16 shows an attachment and fixing structure suitable for the detector group 43' according to some specific embodiments, where Fig. 16(a) is a perspective view of the detector group in an attached state, and Fig. 16(b) is a side view of the detector group in an attached state.

[0197] 16 , a first mounting portion of the mounting and fixing structure for the detector group 43′ includes a slider 432 provided on a detector arm 431, the slider 432 extending along the longitudinal direction of the detector arm 431, and when the detector group 43′ is attached to the radiation scanning device, the longitudinal direction of the detector arm 431 is perpendicular to the direction in which the subject 6 is transported in the radiation scanning device. The slider 432 may be fixed to the detector arm 431 by bolt connection or the like, or may be molded integrally with the detector arm 431. A recessed groove 433 extending in the longitudinal direction is formed in the detector arm 431, and the slider 432 is provided in this recessed groove 433.

[0198] The second mounting portion is formed as a fixed rail 434 that engages with the slider 432. The fixed rail 434 is fixedly connected to a support frame 5 of the radiation scanning device, and may be molded integrally with the support frame 5. The longitudinal direction of the fixed rail 434 is perpendicular to the transport direction of the subject 6. A position restricting portion (not shown) is provided at one end along the longitudinal direction of the fixed rail 434, and when attaching the detector group 43', the slider 432 is aligned with the fixed rail 434, and the detector group 43' is pushed along the fixed rail 434 until the detector arm 431 abuts against the position restricting portion, thereby moving the detector group 43' to a predetermined attachment position.

[0199] The fixing device of the detector group 43' mounting and fixing structure employs the same fixing device as the detector group 41', and the specific structure of the fixing device will not be described in detail here. This fixing device allows the detector group 43' to be fixed by abutting against a corresponding mounting reference surface on the support frame 5. The detector arm 431 of the detector group 43' is also provided with a mounting surface on one side along the width direction, and similarly, both the mounting surface and the mounting reference surface of the support frame 5 are machined to have good flatness so that the detector group 43' can be accurately positioned in the width direction when the mounting surface of the detector arm 431 abuts against the mounting reference surface. Similarly, a plurality of fixing devices, for example at least two, may be provided along the longitudinal direction of the detector group 43' to firmly fix the detector group 43' to the support frame 5.

[0200] When the detector group 43' is attached using the above-described attachment and fixation structure, if the detector units are facing upward, first, the sliders 432 of the detector group 43' are aligned with the fixed guide rails 434, the detector group 43' is moved along the fixed guide rails 434 until it abuts against the position regulating portions on the fixed rails 434, and then the fastening bolts are inserted into the corresponding screw holes in the positioning member and the detector arms and tightened, thereby positioning the detector group 43' with respect to the attachment reference surface of the positioning member. To remove the detector group 43', the reverse operation is performed.

[0201] The longitudinal direction of the fixed guide rail is perpendicular to the direction in which the subject 6 is transported in the radiation scanning device, and the side of the detector group 43' along the X direction is not obstructed by the radiation source, so the above-mentioned mounting and fixing structure makes the detector group 43' attachable to and detachable from the support frame 5 in a direction perpendicular to the direction in which the subject 6 is transported in the radiation scanning device. Furthermore, because the fixing device is provided on one side of the detector group 43' along the width direction, i.e., one side of the detectors along the Z direction, the detector group can be fastened without blocking the radiation source, making it easy to attach, detach, and maintain the detector group.

[0202] Optionally, in the above mounting and fixing structure, the second mounting portion may be configured to support the detector group 43' at a predetermined mounting position while engaged with the first mounting portion. Specifically, as shown in Fig. 16, the fixed rail 434 has receiving portions 4341 and 4342, which not only slidably engage with the slider 432 but also support the slider 432 below, thereby supporting the detector group 43' at the predetermined mounting position from below after the detector group 43' has moved along the fixed rail 434 to the predetermined mounting position. In this way, no additional tools are required when tightening the detector group 43', and the operator does not need to support the detector group 43', allowing the tightening operation to be performed, improving operability.

[0203] Figure 17 shows a mounting and fixing structure suitable for a detector group 44' in some specific embodiments, where (a) of Figure 17 shows a perspective view of the detector group in an mounted state, (b) of Figure 17 is a schematic diagram of the first and second mounting parts of the mounting and fixing structure in a separate state, and (c) of Figure 17 and (d) of Figure 17 are perspective views of different viewing angles when the first and second mounting parts of the mounting and fixing structure are in an engaged state.

[0204] Specifically, the first mounting portion of the mounting and fixing structure for the detector group 44' includes a fixing block 442 provided on one side along the width direction of the detector arm 441, and the fixing block 442 has an opening 443 on one side along the thickness direction of the detector arm 441. When the detector group 44' is mounted, the width direction of the detector arm 441 coincides with the direction in which the subject 6 is transported in the radiation scanning device, and the thickness direction is perpendicular to the direction in which the subject 6 is transported. The opening 443 of the fixing block 442 may be U-shaped or have any other appropriate shape. The fixing block 442 may be fixedly connected to the detector arm 441 by a method such as bolt fixing, or may be formed integrally with the detector arm 441.

[0205] The second mounting portion is formed as a cantilever portion 444 fixed to the support frame 5, and an extension portion 445 is provided at the end of the cantilever portion 444 away from the support frame 5. The extension portion 445 linearly moves and engages with the opening 443 in the fixed block 442, i.e., the extension portion 445 can move along a straight line from the edge of the opening 443 to the inside of the opening 443. The longitudinal direction of the cantilever portion 444 coincides with the direction in which the subject 6 is transported in the radiation scanning device. The bottom of the opening 443 functions as a position restriction portion. When mounting the detector group 44', the opening 443 of the fixed block 442 in the detector arm 441 is aligned with the extension portion 445, and the detector arm 441 is moved along a straight line relative to the extension portion 445 until the bottom of the opening 443 abuts against the extension portion 445, thereby restricting the detector group 44' to a predetermined mounting position.

[0206] The fixing device is installed on one side of the detector arm 441 in the width direction (the same side as the fixing block 442), and an end face of the fixing device forms a mounting reference surface, with the fixing device fastening the detector arm 441 to the mounting reference surface. Specifically, the fixing device includes a fixing member 446 and a fastener 447, and the end face of the fixing member 446 away from the support frame 5 forms a mounting reference surface 448 that abuts against a surface 449 on one side of the detector arm 441 in the width direction. The surface 449 is the mounting surface of the detector arm 441, and both the surface 449 and the mounting reference surface 448 are machined to have good flatness. When the mounting surface 449 of the detector arm 441 abuts against the mounting reference surface 448 and is fixed, the detector group 44′ can be accurately positioned in the width direction. The fastener 447 is used to fasten the detector arm 441 to the end face 448 of the fixing member 446. The fastener 447 may be a fixing bolt, and corresponding screw holes are formed in the fixing member 446 and the side of the detector arm 441 facing the fixing member 446 along the width direction, and the fastener 447 can be passed through the corresponding screw holes in the fixing member 446 and the detector arm 441 and tightened to fasten the detector group 44' to the mounting reference surface 448. Also, a plurality of fixing devices, for example at least two, may be provided, and the plurality of fixing devices may be arranged at intervals along the longitudinal direction of the detector group 44' to firmly fix and position the detector group 44'.

[0207] When attaching the detector group 44' using the above-described attachment and fixation structure, first, with the detector units facing the scanning region and with the width direction coinciding with the transport direction of the subject 6, the openings 443 of the fixing blocks 442 in the detector group 44' are aligned with the extensions 445 of the cantilever portions 444, and the detector group 44' is moved along the extensions 445 until the bottoms of the openings 443 abut against the extensions 445, and then fasteners 447 are passed through corresponding screw holes in the fixing member 446 and the detector arm 441 and tightened, thereby positioning the detector group 44' with respect to the attachment reference surface 448 of the fixing member 446. To remove the detector group 44', the reverse operation is performed.

[0208] As a result, with the above mounting and fixing structure, the cantilever portion 444 extends along the transport direction of the subject 6 in the radiation scanning equipment, the width direction of the detector group 44' is parallel to the transport direction of the subject 6, and the opening 443 of the fixing block 442 faces one side in the thickness direction of the detector group 44', and by facing the detector crystal toward the scanning area, the detector group 44' can be attached or detached along a direction perpendicular to the transport direction of the subject 6.

[0209] Optionally, in the above mounting and fixing structure, the second mounting portion may be configured to support the detector group 44' at a predetermined mounting position while engaged with the first mounting portion. That is, after the detector group 44' has moved to a predetermined installation position relative to the extension portion 445, the cantilever portion 444 can support the entire detector group 44' by the fixing block 442 without requiring any other auxiliary structure or tool. In this way, when tightening the detector group 44', no additional tool is required, and the operator does not need to support the detector group 44', allowing for the tightening operation to be performed with improved operability.

[0210] Each of the detector groups 41', 42', 43', and 44' can be detached from or attached to the support frame 5 using a different fixed attachment structure, but after attachment, each detector group may be located in the same plane as the other detector groups, perpendicular to the transport direction of the test object 6. Specifically, the attachment reference plane of each detector group can be arranged in the same plane perpendicular to the transport direction of the test object 6, and each of the detector groups 41', 42', 43', and 44' can be located in the same plane perpendicular to the transport direction of the test object 6, after attachment.

[0211] Furthermore, the linear movement engagement between the first and second mounting parts of the fixed mounting structure in Figures 15 and 16 uses an engagement between a slider and a guide rail, but according to other embodiments, the fixed mounting structure of the present application may employ other linear movement engagements, such as a linear slide or linear rolling engagement, or may employ, for example, an engagement between a linear ball bearing and a cylindrical shaft.

[0212] The above has described the mounting structure of the detector group of the detector 4 of the radiation scanning device of this embodiment. Hereinafter, other aspects of the features of the radiation scanning device of this embodiment will be described.

[0213] The relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device of this embodiment is basically the same as that of the above embodiment. Similarly to the above embodiment, the radiation source 3 includes a plurality of radiation source modules, each of which is arranged around the scanning region and is located in a plane, particularly in the same plane, perpendicular to the direction of transport of the object 6; the detector 4 includes a plurality of detector groups, each of which is located in another plane, particularly in the same plane, perpendicular to the direction of transport of the object 6, and the ends of each detector group are connected to each other and arranged around the scanning region; further, in a combined state of the radiation source 3 and the detector 4, the detector 4 is arranged inside the radiation source 3 along a direction perpendicular to the direction of transport of the object 6, and the radiation source 3 and the detector 4 are arranged so as to overlap at least partially in the direction of transport of the object 6; the plurality of detector groups of the detector 4 may have any of the structures described in the above embodiment, such as a closed square structure, rectangular structure, polygonal structure, or elliptical structure surrounding the scanning region; different from the above embodiment, the plurality of radiation source modules of the radiation source 3 are arranged around the scanning region in a non-enclosed structure, such as a rectangular structure, polygonal structure, or elliptical structure, which is open on the left side of the scanning region, as in any of the structures described above in this embodiment.

[0214] As in the above embodiment, each detector group of the detector 4 in this embodiment may be arranged so as not to block the radiation beam of the radiation source module on the same side, while being able to receive radiation from each radiation source module on the other side. Because the radiation source 3 and the detector 4 are both arranged in a ring shape (except that the radiation source 3 is a semi-closed ring with an opening on the left side), the same detector group may be shared by radiation source modules of different radiation sources. Furthermore, radiation from each radiation source module of the radiation source 3 can be detected by the detector group on the opposite side as well as by the detector group on the other side, so that radiation from each radiation source module can be detected by as many detectors as possible. Therefore, the detector of this embodiment can similarly improve image quality while reducing the number of detector groups and lowering equipment costs.

[0215] Also, similarly to the above embodiment, the detector crystal of each detector group of the detector 4 is selectively arranged at an end of the detector unit in the direction of transport of the object 6, and is arranged close to the edge of the radiation beam of the radiation source module on the same side in the direction of transport of the object 6, but not to shield the radiation beam of the radiation source module on the same side. This makes it possible to minimize the covering length of the optical path between the radiation source and the detector, thereby reducing the length of the equipment.

[0216] As in the above embodiment, each radiation source module of the radiation source 3 is selectively arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystal of the detector group on the opposite side. Specifically, as in the above embodiment, the radiation source module rotates at a predetermined angle about the target axis to adjust the beam exit angle of the radiation beam from the radiation source module, so that the center position of the radiation beam is irradiated on the detector crystal. Since the detector crystal of the detector is located at the end position of the detector unit in the transport direction of the object 6 and is located close to the edge of the radiation beam from the radiation source on the same side, the radiation source module can rotate by a very small predetermined angle, for example, 1.5 degrees, to irradiate the detector crystal at the center position of the radiation beam. This minimizes the adverse effect on imaging caused by the crystal surface on which the radiation beam is incident at an oblique angle. The radiation source module can rotate about the target axis or another axis, as in the above embodiment, or the beam exit angle of the radiation beam can be adjusted by any other appropriate method mentioned in the above embodiment.

[0217] In addition, since the projection data is also missing at the end of the adjacent radiation source module of the radiation source in this embodiment, similar to the above embodiment, the image processing module of the radiation scanning device in this embodiment is also configured with a data compensation function that can compensate for the missing data in the field of view and / or repair the reconstructed image in order to improve image quality. The image processing module of the radiation scanning device in this embodiment performs image reconstruction in the same manner as the above embodiment.

[0218] In addition to having the same advantages as the radiation scanning apparatus of the above embodiment, the radiation scanning apparatus of this embodiment further has the following advantages.

[0219] The radiation scanning device of this embodiment is particularly suitable for airport baggage security inspection. Airport baggage is characterized by its small volume (e.g., typically less than 600mm x 400mm), large length and width, and small thickness. When placed on a conveying device for detection, the thickness is typically along the vertical direction, the width along the horizontal direction, and the length along the conveying direction. The radiation scanning device of this embodiment has radiation source modules located on both the top and bottom of the scanning area to scan the baggage in the thickness direction. This allows for more projection data to be obtained in the thickness direction, where the size is smaller. Furthermore, because the baggage's thickness is small, projection data in the thickness direction is affected by self-shielding and radiation attenuation, so projection data in the thickness direction is more accurate and clearer than in other directions, which is advantageous for improving image quality. At the same time, the radiation source of the radiation scanning equipment of the present invention has a radiation source module installed on only one side of the width direction of the luggage, and in the width direction, the projection data is significantly affected by self-shielding and radiation attenuation by the luggage, so the quality of the projection data is poor compared to the quality of the projection data in the thickness direction. Therefore, by installing a radiation source module on only one side of the width direction of the luggage, it is possible to reduce the cost of the radiation source while ensuring image quality.

[0220] Although the radiation scanning device of this embodiment does not have a radiation source on the left side of the scanning area, a right detector group is still provided opposite the left side of the scanning area, and the right detector group can receive radiation from the radiation source modules on both the upper and lower sides, thereby increasing the corresponding detection data of the radiation from the radiation source modules on both the upper and lower sides, thereby improving image quality compared to when detector groups are only provided on the opposite sides of each radiation source module.

[0221] In addition, in this embodiment, an example has been described in which multiple radiation source modules of the radiation source are arranged in the same plane perpendicular to the transport direction of the subject, but the same applies when multiple radiation source modules applied to the radiation source are arranged in different planes perpendicular to the transport direction of the subject.

[0222] In addition, in the examples, the case where multiple detector groups of detectors are arranged in the same plane as the transport direction of the subject has been described as an example, but the same applies when multiple detector groups of detectors are arranged in different planes perpendicular to the transport direction of the subject.

[0223] In the above-described embodiment, a line scanning device in which the radiation source surrounds the scanning area on all four sides (top, bottom, left, and right) has been described. According to another embodiment, the present application further provides a radiation scanning device, the layout of which is basically the same as that of the radiation scanning device of the above-described embodiment, with the main difference being the layout of the radiation source. In this embodiment, the radiation source surrounds the scanning area only on three sides (top, left, and right), i.e., the radiation source surrounds the scanning area only above the transport device, and no radiation source module is installed below the transport device (see FIG. 18 , which shows a schematic layout diagram of the radiation source and detector according to this embodiment). Here, “above the transport device” refers not only to directly above the transport device, but also to the side above the transport device. Furthermore, “above the transport device” does not necessarily have to be higher than the transport device in the strict sense; a location that is approximately the same height as the transport device or slightly lower than the transport device is also included in the scope of this embodiment.

[0224] Specifically, in the radiation scanning equipment of the above embodiment, each radiation source module of the radiation source 3 is a distributed multi-point radiation source, and the multiple radiation source modules may be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area. In this embodiment, the multiple radiation source modules of the radiation source may still be distributed multi-point radiation sources, with the difference being that the multiple radiation source modules are arranged in a non-enclosed structure surrounding the scanning area and opening downwards on the conveying device, for example, in a rectangular structure, a polygonal structure, an elliptical structure, etc. opening downwards on the conveying device. In the above embodiments, the radiation sources 3 are arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal or discontinuous rounded rectangular structure, and other polygonal and elliptical structures. However, in the present embodiment, the radiation sources are arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal or discontinuous rounded rectangular structure, and other polygonal and elliptical structures that open below the transport device. For example, with respect to the radiation source shown in FIG. 2 , the radiation source 3 of this embodiment does not include at least the lower radiation source module 33, and in some cases, does not include portions of the radiation source modules 32 and 34 that are lower than the transport device 1. For example, with respect to the radiation source shown in FIGS. 4(b) to 4(c), the radiation source 3 of this embodiment does not include at least the radiation source module below the subject 6.

[0225] Furthermore, similar to the above embodiment, the radiation source of this embodiment may be composed of multiple single-point radiation groups, and the only difference is that the radiation source 3 of this embodiment does not have single-point radiation sources at the bottom viewing angle, the lower left oblique viewing angle, and the lower right oblique viewing angle.

[0226] Except for the above differences, the other features of the radiation source of this embodiment are all the same as those of the radiation source 3 of the above embodiment.

[0227] The detector of this embodiment has basically the same features as the detector 4 of the above embodiment, except that in this embodiment, the detector is combined with radiation sources surrounding the scanning area only on the upper, left, and right sides, and the detector groups located below the scanning area of ​​the detector 4 do not have radiation source modules on the same side, and the detector groups located below the scanning area of ​​the detector 4 are not hindered from being removed or installed by the radiation source modules below. Therefore, each detector group of the detector is removed using the same mounting and fastening structure as in the above embodiment, and the detector groups located below the scanning area can be attached and detached to the support frame 5 in a direction perpendicular to the transport direction of the object 6 without being hindered by the radiation source modules on the left or right sides, specifically, by using the mounting and fastening structure described above with reference to FIG.

[0228] The relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device of this embodiment is basically the same as that of the above embodiment. Specifically, similar to the above embodiment, the radiation source 3 includes a plurality of radiation source modules, each of which is arranged around the scanning area and is located in a plane perpendicular to the transport direction of the object 6, particularly in the same plane; the detector 4 includes a plurality of detector groups, each of which is located in another plane perpendicular to the transport direction of the object 6, particularly in the same plane, and the ends of each detector group are connected to each other and arranged around the scanning area; and further, in the combined state of the radiation source 3 and the detector 4, the detector 4 is arranged in a direction perpendicular to the transport direction of the object 6, so that the radiation source 3 is aligned with the detector 4 along the direction perpendicular to the transport direction of the object 6. The radiation source 3 and the detector 4 are arranged inside the transport device, and at least a part of them overlap in the transport direction of the subject 6. The multiple detector sets of the detector 4 may have any of the structures described in the above embodiments, such as a closed square structure, rectangular structure, polygonal structure, or elliptical structure, surrounding the scanning area. The difference from the above embodiments is that the multiple radiation source modules of the radiation source 3 are arranged in a non-enclosed structure around the scanning area, opening below the transport device, for example, a rectangular structure, polygonal structure, or elliptical structure, opening below the transport device, such as any of the structures in this embodiment.

[0229] As in the above embodiment, each detector group of the detector 4 in this embodiment may be selectively arranged so as not to block the radiation beam of the radiation source module on the same side while being able to receive radiation from each radiation source module on the other side. Because the radiation source 3 and the detector 4 are both arranged in a ring shape (except that the radiation source 3 is a semi-closed ring with an open bottom), the same detector group may be shared by different radiation source modules of the radiation source. Furthermore, radiation from each radiation source module of the radiation source 3 can be detected not only by the detector group on the opposite side but also by the detector group on the other side, allowing as much radiation from each radiation source module as possible to be detected by the detectors. Therefore, the detector of this embodiment can similarly improve image quality while reducing the number of detector groups and lowering equipment costs.

[0230] Also, similarly to the above embodiment, the detector crystal of each detector group of the detector 4 is selectively arranged at an end of the detector unit in the direction of transport of the object 6, and is arranged close to the edge of the radiation beam of the radiation source module on the same side in the direction of transport of the object 6, but not to shield the radiation beam of the radiation source module on the same side. This makes it possible to minimize the covering length of the optical path between the radiation source and the detector, thereby reducing the length of the equipment.

[0231] As in the above embodiment, each radiation source module of the radiation source 3 is selectively arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystal of the detector group on the opposite side. Specifically, as in the above embodiment, the radiation source module rotates at a predetermined angle about the target axis to adjust the beam exit angle of the radiation beam from the radiation source module, thereby irradiating the detector crystal at the center of the radiation beam. Since the detector crystal of the detector is located at the end of the detector unit in the transport direction of the object 6 and is located close to the edge of the radiation beam from the radiation source on the same side, the radiation source module can rotate by a very small predetermined angle, for example, 1.5 degrees, to irradiate the detector crystal at the center of the radiation beam. This minimizes the adverse effect on imaging caused by the radiation beam being incident on the detector at an oblique angle. The radiation source module can rotate about the target axis or another axis, as in the above embodiment, or the beam exit angle of the radiation beam can be adjusted by any other appropriate method mentioned in the above embodiment.

[0232] In addition, since projection data is missing at the end of the radiation source module adjacent to the radiation source in this embodiment, similar to the above embodiment, the image processing module of the radiation scanning device in this embodiment is also configured with a data compensation function that can compensate for the missing data in the field of view and / or repair the reconstructed image in order to improve image quality. The image processing module of the radiation scanning device in this embodiment performs image reconstruction in the same manner as the above embodiment.

[0233] The radiation scanning device of this embodiment has the same advantages as the radiation scanning device of the above embodiment, and also has the following advantages.

[0234] In the radiation scanning device of this embodiment, the radiation source module is not arranged below the conveying device, so the height of the conveying device can be lowered, making it easier to transport the test object to the conveying device.In addition, compared to the above embodiment in which the radiation source module is also arranged below the conveying device, this embodiment can save on equipment costs.

[0235] Although the radiation scanning device of this embodiment does not have a lower radiation source, it still has an upper detector group facing the lower position, which can receive radiation from the radiation source modules on both sides and increase the corresponding detection data of the radiation from the radiation source modules on both sides, thereby improving the image quality compared to when detector groups are only arranged on the opposite sides of each radiation source module.

[0236] In addition, in this embodiment, an example has been described in which multiple radiation source modules of the radiation source are arranged in the same plane perpendicular to the transport direction of the subject, but the same applies when multiple radiation source modules applied to the radiation source are arranged in different planes perpendicular to the transport direction of the subject.

[0237] Furthermore, in this embodiment, an example has been described in which multiple detector groups of detectors are arranged in the same plane as the transport direction of the subject, but the same applies when multiple detector groups of detectors are arranged in different planes perpendicular to the transport direction of the subject.

[0238] In the above embodiment, a radiation scanning device is described in which the radiation source and the detector surround the scanning area on four sides (top, bottom, left, and right). According to another embodiment, the present application further provides a radiation scanning device having basically the same structure as the radiation scanning device of the above embodiment, except for the arrangement of the radiation source and the detector. Specifically, in this embodiment, when viewed from the direction of transport of the object, the multiple radiation source modules of the radiation source are arranged around the scanning region in a non-sealed structure opening to one side of the scanning region, the multiple detector groups of the detector are also arranged around the scanning region in a non-sealed structure opening to one side of the scanning region, and the openings of the non-sealed structures of the detectors are arranged opposite to the openings of the non-sealed structures of the radiation source, and the multiple detector groups of the detector are fixed in the same plane perpendicular to the direction of transport of the object, and the multiple radiation source modules of the radiation source are fixed in different planes perpendicular to the direction of transport of the object. For example, the radiation source module of the radiation source arranged on the opening side of the non-sealed structure of the detector and each detector group of the detector are fixed in the same plane perpendicular to the direction of transport of the object, and the other radiation source modules of the radiation source are fixed in different planes perpendicular to the direction of transport of the object.

[0239] The configuration and arrangement of the radiation source of the radiation scanning device according to this embodiment will be described in detail below.

[0240] Similar to the above embodiment, the radiation source of the radiation scanning device of this embodiment includes multiple radiation source modules, and each radiation source module may be a distributed multi-point radiation source. As a distributed multi-point radiation source, each radiation source module may have multiple target points, and each target point of each radiation source module may generate a radiation beam independently. Each target point may generate a radiation beam at a predetermined timing under the control of a control device. As shown in FIG. 3, the radiation beam may be a fan beam with an opening angle A. Of course, the shape of the radiation beam is not limited to a fan beam, and may be a cone beam, a parallel beam, or other beam shapes, and may be specifically configured as needed.

[0241] In the above embodiment, when viewed along the transport direction of the subject, the multiple radiation source modules of the radiation source surround the scanning area on all four sides, but in this embodiment, when viewed along the transport direction of the subject, the multiple radiation source modules of the radiation source are arranged to surround the scanning area on only three sides, that is, a non-sealed structure opening to one side of the scanning area is arranged around the scanning area. Specifically, as shown in FIGS. 19 to 21 (FIG. 19 is a perspective schematic view showing the layout of the radiation source and detector of the radiation scanning device according to this embodiment, FIG. 20 is a side schematic view of the radiation source and detector shown in FIG. 19 viewed along the direction of transport of the subject, and FIG. 21 is a plan schematic view showing the layout of the radiation source and detector shown in FIG. 19), the radiation source modules on the left and right sides of the scanning region are arranged in the same plane perpendicular to the direction of transport of the subject (the radiation outlet positions are indicated by solid lines in FIG. 21), and the radiation source module below the scanning region is arranged in another plane perpendicular to the direction of transport of the subject (the radiation outlet positions are indicated by dotted lines in FIG. 21). When viewed from the direction of transport of the subject, the radiation source 3 includes radiation source modules 31, 32, and 33 arranged on the left, right, and below the scanning region, respectively, and the radiation source modules 31, 32, and 33 form a non-sealed structure surrounding the scanning region which opens above the scanning region. In the illustrated embodiment, In this example, the radiation source module is a linearly distributed multi-dot radiation source, and the non-sealed structure of the radiation source is a right-angled rectangular structure opening above the scanning area. The radiation source modules 31, 32, and 33 of the radiation source 3 are not limited to linearly distributed multi-point radiation sources, and may be arc-shaped, polygonal, or other shapes in other embodiments. The linear, arc-shaped, or polygonal radiation source modules can be combined as needed, and may form a rounded rectangular structure, polygonal structure, elliptical structure, or other shape surrounding the scanning area with the radiation source 3 opening above the scanning area when viewed from the direction of object transport. Furthermore, when viewed from the direction of object transport, the radiation source modules of the radiation source 3 are not limited to being located on the left, right, and below the scanning area, and may be located, for example, on the upper, left, and right sides, or on the upper, lower, and left sides, or on the upper, lower, and right sides, and may be specifically configured according to actual usage scenarios.In the following description of this embodiment, the case where the radiation source modules are arranged on the left, right, and bottom sides of the scanning area will be described as an example, but the principles are similarly applicable to the case where the radiation source modules are arranged on any of the other three sides.

[0242] Similar to the above-described embodiments, the radiation source modules of the radiation source of this embodiment are also individually detachable from each other, meaning that each radiation source module has its own cavity for accommodating its respective radiation generating device, and each radiation source module has its own cavity, and the target points of each radiation source module share an individual vacuum chamber. The spacing of the target points of each radiation source module within the vacuum cavity can be determined by the number of target points and the length of the cavity. According to some embodiments, the number of target points in each radiation source module may be 192, 264, etc., and the spacing of the target points in each radiation source module may be 4 mm, 12 mm, etc. The advantage of each radiation source module having its own cavity is that, compared to a radiation source with an integral annular cavity (i.e., all target points of the radiation source are located in the same annular vacuum cavity), the housing size of the individual radiation source module and the volume of the internal vacuum cavity can be reduced, and the volume and weight of the individual radiation source module can be reduced, making it convenient to remove and install the radiation source; and each radiation source module employs its own vacuum cavity, which reduces the risk of ignition in the cavity when performing maintenance on the radiation source module.

[0243] Furthermore, similar to the above embodiment, each radiation source module of the radiation source 3 is provided with a mounting and positioning structure for mounting and adjusting the radiation source module. The mounting and positioning structure allows each radiation source module of the radiation source 3 to be mounted and fixed at a predetermined position in the radiation scanning device. The mounting and positioning structure also allows the radiation source module to be rotated to adjust the beam output angle of the radiation beam. The radiation source modules of the radiation source 3 may adopt different mounting methods and have different mounting and positioning structures depending on their positions in the radiation scanning device. For example, the radiation source modules located on the left and right sides of the scanning area may be mounted in a suspended manner by equipment such as the ceiling. The radiation source module located below the scanning area is not suitable for a suspended manner and may be mounted and fixed using the mounting and positioning structure described in the above embodiment (such as the mounting and positioning structure shown in FIG. 5 ) or the beam output angle of the radiation beam may be adjusted.

[0244] Similarly to the above embodiment, the radiation source 3 may be composed of multiple single-point radiation sources, and each radiation source module may be a single-point radiation source group, each single-point radiation source group including at least two single-point radiation sources. Each single-point radiation source can individually transmit a radiation beam, for example, a fan beam having an opening angle A (shown in FIG. 3). Each single-point radiation source of the radiation source 3 can emit radiation at a predetermined timing under the control of a control device of the radiation scanning system. When each radiation source module is a single-point radiation source group, the single-point radiation group may be distributed at least to the bottom, left, and right field angles, and may further be distributed to the corner oblique field angles, for example, the lower left and lower right oblique field angles, and further to the upper left and upper right oblique field angles (shown in FIG. 22).

[0245] Next, the arrangement of the detector 4 in the radiation scanning device of this embodiment will be described in detail. As in the above embodiment, the detector 4 may include multiple detector groups, and the multiple detector groups may be selectively positioned in the same plane perpendicular to the transport direction of the subject 6. Also, as in the above embodiment, the detector group of this embodiment is a detector array including multiple detector units.

[0246] In the above-described embodiment, multiple detector groups of the detector 4 are arranged on four sides of the scanning area, surrounding the scanning area as viewed along the transport direction of the subject, forming a closed structure surrounding the scanning area. However, in this embodiment, the detector groups of the detector 4 are arranged to surround the scanning area on only three sides as viewed along the transport direction of the subject, i.e., are arranged around the scanning area in a non-sealed structure that opens to one side of the scanning area. Specifically, as shown in FIGS. 19 to 21 , the detector 4 includes detector groups 41, 42, and 43 arranged on the left, right, and upper sides of the scanning area, respectively. The ends of the detector groups 41, 42, and 43 are connected to each other, forming a non-sealed structure around the scanning area that opens to the lower side of the scanning area. In the embodiment shown in FIGS. 19 to 21 , the detector groups 41, 42, and 43 are linear detector arrays that include multiple detector units arranged along a straight line, forming a non-sealed rectangular or square structure that opens to the lower side of the scanning area. However, the detector 4 of this embodiment is not limited to the above configuration and may have other configurations. For example, detector 4 may include three long linear detector arrays and two short linear detector arrays, which are arranged alternately around the scan area and connected at their ends to form an open polygonal structure (shown in FIG. 23 ) that opens below the scan area. Detector 4 may also include other numbers of long linear detector arrays and other numbers of short linear detector arrays, which are arranged alternately around the scan area and connected at their ends to form other open polygonal structures that open below the scan area. The detector group of detector 4 in this embodiment may further include multiple arc-shaped detector arrays, which are arranged around the scan area and connected at their ends to form an open elliptical structure that opens below the scan area. The detector group of detector 4 in this embodiment may also be a combination of linear and arc-shaped detector arrays, forming other shapes of open structures that open below the scan area, such as a rounded rectangular structure that opens below the scan area. Here, the structure of the detector unit and the configuration of the linear detector array type and arc detector array type detector group are completely the same as those described in the above embodiment.

[0247] 19 to 21, the detector group of detector 4 is not limited to being provided on the left, right, and upper sides of the scanning area, and may be provided, for example, on the lower, left, and right sides, or the upper, lower, and left sides, or the upper, lower, and right sides, as long as the opening of the non-sealed structure of the radiation source faces the opening of the non-sealed structure of the radiation source. In this embodiment, an example will be described in which the detector groups shown in Figures 19 to 21 are provided on the left, right, and upper sides of the scanning area, but this embodiment is also applicable to cases in which the detector groups are provided on any other three sides.

[0248] Furthermore, similar to the above-described embodiments, in some embodiments, each detector group of the detector 4 can be individually detached and attached, thereby improving the maintainability of the detectors. Similarly to the above-described embodiments, the multiple detector groups of the detector 4 in this embodiment can be detached and attached by moving along the transport direction of the object 6. When the detector groups of the detector 4 are arranged inside the radiation source 3 in a direction perpendicular to the transport direction of the object 6, the detector groups can be detached, adjusted, and maintained without the need to remove the radiation source, thereby further improving the maintainability of the detectors. The detector 4 and detector groups 41, 42, and 43 as shown in FIGS. 19 to 21 can be detached and attached by moving in a direction parallel to the transport direction of the object 6, and can be detached, adjusted, and maintained without removing the radiation source modules 31, 32, and 33. The detector groups 41, 42, and 43 of the detector 4 can be attached to and detached from the attachment positions in the radiation scanning device by moving them along the transport direction of the subject 6 relative to the attachment positions in the radiation scanning device using an attachment and fixing structure similar to that described in the above embodiment (such as the embodiment shown in FIG. 9 and its modified examples). For example, similar to the above embodiment, the detector groups 41, 42, and 43 may be attached to or detached from the support frame 5 of the radiation scanning device via detector arms.

[0249] Furthermore, when the openings of the non-sealed structures of the radiation source or detector face the left or right side of the scanning region, the detector group of the detector 4 may be attached or detached by moving them in a direction perpendicular to the transport direction of the object. As shown in FIG. 24 , when viewed along the transport direction of the object, the openings of the non-sealed structures of the radiation source modules 31, 32, and 33 of the radiation source face the left side of the scanning region, and the openings of the non-sealed structures of the detector groups 41, 42, and 43 of the detector 4 face the right side of the scanning region. In this case, the detector groups 41, 42, and 43 can be attached or detached by moving them relative to their mounting positions (e.g., the support frame 5) in a direction perpendicular to the transport direction of the object, as shown by the arrows in (b) of FIG. 24 . Because no radiation source module is provided on the left side of the scanning region, the radiation source does not interfere with the above-mentioned movement of the detectors, and the detector group can be easily detached. As described above, such a detachable method may employ an attachment / fixing structure that attaches and detaches the detector group along a direction perpendicular to the transport direction of the subject, and can be realized, for example, by using the attachment / fixing structure and its variations described with reference to Figures 15 to 17.

[0250] Furthermore, some of the detector groups of the detector 4 may be attached and detached by moving along the direction of transport of the subject, and other parts may be attached and detached by moving along a direction perpendicular to the direction of transport of the subject. For example, in the embodiment shown in FIGS. 19 to 21 , if the highest point of the radiation source modules 31, 32 on the left or right side of the scanning area is lower than the detector group 41 above the scanning area, the detector group 41 is attached and detached by moving in a direction perpendicular to the direction of transport of the subject. A specific mounting and fixing structure may be the embodiment shown in FIG. 15 or its modified example. Similarly, if the detector groups of the detector 4 are arranged on the left, right, and lower sides of the scanning area, and the lower detector group is lower than the lowest points of the radiation source modules on the left and right, the lower detector group may be attached and detached by moving in a direction perpendicular to the direction of transport of the subject. A specific mounting and fixing structure may be the embodiment shown in FIG. 16 or its modified example.

[0251] Also, similar to the above embodiment, the multiple detector groups of the detector are mounted in the same plane perpendicular to the transport direction of the specimen 6 after being mounted, with their respective mounting surfaces and corresponding mounting reference surfaces (installed in the same plane perpendicular to the transport direction of the specimen 6).

[0252] Next, the relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device according to this embodiment will be further described. The relative arrangement of the radiation source 3 and the detector 4 in this embodiment is different from that of the above-mentioned embodiment. In this embodiment, when the radiation source and the detector are combined, the opening of the non-sealed structure of the radiation source is arranged opposite to the opening of the non-sealed structure of the detector, multiple detector groups of the detector are fixed in the same plane perpendicular to the direction of transport of the object, and multiple radiation source modules of the radiation source are arranged in multiple planes perpendicular to the direction of transport of the object, for example, the radiation source module and each detector group of the detector arranged on the side of the non-sealed structure of the detector of the radiation source are fixed in the same plane perpendicular to the direction of transport of the object, and other radiation source modules of the radiation source are fixed in other planes perpendicular to the direction of transport of the object. Other radiation source modules of the radiation source may be located in other individual planes or in other multiple different planes perpendicular to the transport direction of the subject, and optionally may be located in other individual planes. This embodiment will be described as an example in which the other radiation source modules are arranged in other individual planes perpendicular to the transport direction of the subject (as shown in Figure 21), but the same applies to other multiple different planes.

[0253] In the combined state of the radiation source and the detector, the radiation source may have the configuration of any of the above-described embodiments, for example, a rectangular, polygonal, or elliptical structure opening on one side of the scanning area when viewed along the direction of transport of the subject, and the detector may have the structure of any of the above-described embodiments, for example, a square, rectangular, polygonal, or elliptical structure opening on one side of the scanning area, as long as the openings of the radiation source and the detector structure are arranged opposite each other. Hereinafter, the detailed arrangement of the combined state of the radiation source 3 and the detector 4 will be described using the embodiment shown in Figures 19 to 21 as an example, but the same principle can be applied to any other combination of the radiation source 3 and the detector 4.

[0254] In some examples, similar to the above embodiments, based on the combination of the radiation source 3 and the detector 4, in consideration of the circular arrangement (semi-closed loop) of the detectors, the detector groups 41, 42, and 43 of the detector 4 are arranged so as to receive radiation from each radiation source module on the other side, respectively, and multiple radiation source modules of the radiation source can share each detector group of the detector. This reduces the number of detector groups. Furthermore, the radiation from the radiation source modules 31 and 32 is not only detected by the detector groups 42 and 41 on the opposite side, but may also be received by other detector groups other than the detector on the same side. The radiation from the radiation source module 33 may be received by all the detector groups 41, 42, and 43, so that the radiation from each radiation source module can be detected by as many detectors as possible. As a result, although the radiation source modules and detectors are arranged on only three sides of the scanning area, the radiation scanning device of this embodiment can still obtain sufficient detection data for image reconstruction. At the same time, the number of radiation source modules and detector groups is reduced, thereby reducing the weight of the device, which is advantageous for building a lightweight radiation scanning device.

[0255] In some examples, the radiation source module 33 of the radiation source 3 is arranged so as to be located in the same plane perpendicular to the transport direction of the object as the detector groups 41, 42, and 43 of the detector 4. Specifically, this means that the radiation outlet of the radiation source module 33 directly faces the detector crystals of each detector group (shown in FIG. 21 ). This allows the radiation beam from the radiation source module 33 to cover more detector crystals, which is advantageous in obtaining more detection data and improving image quality.

[0256] Furthermore, in some examples, similar to the detector groups in the above-described embodiments, the detector groups 41, 42 on the same side as the other radiation source modules 31, 32 of the detector 4 when viewed from the direction of transport of the object, i.e., in the direction perpendicular to the direction of transport of the object, are disposed between the other radiation source modules 31, 32 of the radiation source 3 and the scanning region, respectively, and at least a part of the detector groups 41, 42 on the same side as the other radiation source modules 31, 32 along the direction of transport of the object overlaps with (as shown in FIG. 21 ). This makes it possible to reduce the length of the device covered by the optical path between the radiation source and the detector, and shorten the overall length of the device.

[0257] Furthermore, similar to the detector groups in the above-described embodiments, when the detector groups 41 and 42 at least partially overlap with the radiation source modules 31 and 32 in the direction of transport of the subject, the detector groups 41 and 42 are configured to avoid radiation from the radiation source modules 31 and 32 on the same side and receive radiation from all radiation source modules other than the radiation source module on the same side.

[0258] Furthermore, similar to the above embodiment, the detector crystals of each detector group of the detector 4 are arranged at the end of the detector unit in the direction of transport of the object, and the detector groups 41, 42 on the same side as the other radiation source modules 31, 32 of the detector 4 are arranged adjacent to the edges of the radiation beams of the radiation source modules 31, 32 on the same side in the direction of transport of the object, but are arranged so as not to shield the radiation beams of the radiation source modules 31, 32 on the same side. This allows the radiation source 3 and the detector 4 to overlap to the maximum extent in the direction of transport of the object 6, and the length of the equipment covered by the optical path between the radiation source and the detector can be made as small as possible, thereby reducing the overall length of the equipment.

[0259] Furthermore, in some examples, similar to the above-described embodiments, the radiation source modules 31 and 32 of the radiation source 3 are arranged so that the radiation beams avoid the detector groups 41 and 42 on the same side and irradiate the detector crystals of the detector groups on the opposite sides. Furthermore, similar to the above-described embodiments, the radiation source modules 31 and 32 are rotated by a predetermined angle about their respective target axes to adjust the beam emission angles of the respective radiation beams so that the centers of the respective radiation beams irradiate the detector crystals on the opposite sides. Since the detector crystals of the detectors are located at the end positions of the detector units in the transport direction of the object and are disposed close to the edges of the radiation beams of the radiation source on the same side, the radiation source modules may be rotated by a very small predetermined angle, for example, 1.5 degrees, so that the detector crystals can be irradiated at the centers of the radiation beams. This minimizes the adverse effects on imaging caused by the radiation beams being incident at an oblique angle on the detector crystal surfaces. Also, as in the above embodiments, the radiation source module may be rotatable about the target axis or another axis, or in any other suitable manner as mentioned in the above embodiments, to adjust the beam exit angle of the radiation beam.

[0260] Similarly to the above embodiment, projection data may be missing at the ends of adjacent radiation source modules in this embodiment. For example, in the embodiment shown in FIGS. 19 to 21, the distance between the target points at the adjacent ends of radiation source modules 31 and 33 and the adjacent ends of radiation source modules 33 and 32 may be greater than the distance between the target points within each radiation source, resulting in missing projection data at these ends. Therefore, similar to the above embodiment, the image processing module of the radiation scanning device of this embodiment is also configured with a data compensation function that can compensate for missing data in the field of view and / or restore the reconstructed image to improve image quality. The image processing module of the radiation scanning device of this embodiment performs image reconstruction in a manner similar to the above embodiment.

[0261] Of course, according to other embodiments, the radiation source modules 31, 32 and the radiation source module 33 may be arranged in different planes perpendicular to the object transport direction, so that in some cases, adjacent ends of the radiation source modules 31, 33 and / or adjacent ends of the radiation source modules 33, 32 may be arranged to overlap along the object transport direction, so that the target points of adjacent ends of the adjacent radiation source modules 31, 33 or 32, 33 may overlap or the interval between the target points may not be greater than the interval between the target points within each radiation source. In this case, there is no loss of projection data, and therefore there is no need to perform image reconstruction using the data compensation function of the image processing module.

[0262] The radiation scanning device of this embodiment has the same advantages as the radiation scanning devices of the above-described embodiments, as well as the following advantages.

[0263] The radiation source and detector of this embodiment both surround the scanning area on three sides, and when the scanning area is surrounded on all four sides (which may be either the radiation source or the detector, or both), sufficient data can be acquired to perform image reconstruction, reducing the cost of the equipment and the weight of the equipment, thereby providing a lightweight radiation scanning equipment.

[0264] In addition, in this embodiment, each radiation source module on one side of the scanning area can be made to face the detector crystal of the detector, so that the radiation from the radiation source module can cover more detector units, which is advantageous for increasing the amount of data and improving image quality.

[0265] The above describes a radiation scanning device in which the radiation sources surround the scanning area on four sides (top, bottom, left, right) or any three of these sides. However, in other embodiments, the radiation sources may be arranged to surround the scanning area on only any two of the four sides (top, bottom, left, right).

[0266] Although the mounting and positioning structures for each radiation source module of the radiation source have been described above, the mounting and positioning structures are not limited to the radiation scanning device of the present application, and may be used in other suitable radiation scanning devices.

[0267] The above describes various mounting and fixing structures used for detector groups, but the above mounting and fixing structures are not limited to the radiation scanning device of the present application and may be used in other suitable radiation scanning devices, and the mounting and fixing structures of each embodiment may be used alone or in combination in individual radiation scanning devices.

[0268] The above description is merely a preferred embodiment of the present application and does not limit the present application. Those skilled in the art can make various modifications and changes to the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0269] Those skilled in the art should understand that the above embodiments are illustrative and not restrictive. Different technical features appearing in different embodiments may be combined to achieve beneficial effects. Those skilled in the art will understand and realize other variations of the disclosed embodiments after studying the accompanying drawings, the specification, and the claims. In the claims, the term "comprises" does not exclude other devices or steps, and when an item is not modified by a quantifier, it includes one or more items and is intended to be used interchangeably with "one or more items." The terms "first" and "second" are used to indicate names, not to indicate a particular order. Any reference numerals in the claims should not be construed as limiting the scope of the claims. The functions of multiple parts recited in the claims may be realized by separate hardware or software modules. The fact that some technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. 1. A radiation scanning device comprising: a transport device for transporting the subject through a scanning region of the radiation scanning device; a radiation source including a plurality of radiation source modules, each having at least one radiation source point for emitting a radiation beam, the radiation source modules being arranged around the scanning region only above the transport device and not below the transport device, and fixed in a plane perpendicular to a transport direction of the object; a detector group including a plurality of detectors whose ends are connected to each other and arranged to surround the scanning region and fixed in a plane perpendicular to the transport direction of the subject, the detectors being used to detect radiation transmitted through the subject during a scanning period; the detectors arranged on the left, right and upper sides of the transport device are located between the radiation source and the scanning region along a direction perpendicular to a transport direction of the subject, the radiation source and the detector are arranged to at least partially overlap each other along the transport direction of the subject, and the plurality of radiation source modules are individually detachable from each other. Radiation scanning equipment.

2. the radiation source module is a distributed multi-point radiation source, and the plurality of radiation source modules are configured in a non-enclosed structure surrounding the scanning region and opening downward to the transport device; 10. The radiation scanning device of claim 1.

3. each of the plurality of radiation source modules is a linearly distributed multi-point radiation source, the plurality of linearly distributed multi-point radiation sources are arranged above, to the left and to the right of the scanning region, and ends of the plurality of linearly distributed multi-point radiation sources are directly connected or spaced apart; 3. A radiation scanning device according to claim 2.

4. the plurality of radiation source modules comprises a plurality of first distributed multipoint radiation sources and a plurality of second distributed multipoint radiation sources, the plurality of first distributed multipoint radiation sources and the plurality of second distributed multipoint radiation sources being alternately arranged and being directly connected end to end or being spaced apart; 3. A radiation scanning device according to claim 2.

5. the first distributed multipoint radiation source is a linear distributed multipoint radiation source, and the second distributed multipoint radiation source is a linear distributed multipoint radiation source or an arc-shaped distributed multipoint radiation source having a length shorter than that of the first distributed multipoint radiation source; 5. A radiation scanning apparatus according to claim 4.

6. each of the plurality of radiation source modules is a single-point radiation source group, the plurality of single-point radiation source groups are arranged at least at a left field angle, a right field angle, a top field angle and a corner oblique field angle above the transport device, and each single-point radiation source group includes at least two single-point radiation sources; 10. The radiation scanning device of claim 1.

7. Each radiation source module has a separate cavity for accommodating a respective radiation generating device; 10. The radiation scanning device of claim 1.

8. a mounting and positioning structure is provided in each cavity of each radiation source module, the mounting and positioning structure is used to mount and position the radiation source module, and rotate the radiation source module to adjust the beam output angle of the radiation beam; 8. A radiation scanning apparatus according to claim 7.

9. each detector group is a detector array comprising a plurality of detector units, the plurality of detector groups being arranged in a closed square, rectangular, polygonal or elliptical structure surrounding the scanning area; 10. The radiation scanning device of claim 1.

10. Each detector group is a linear detector array, and the detector comprises four linear detector arrays, which are arranged at four sides of a scanning area, i.e., top, bottom, left, and right, to form a rectangular or square structure; 10. A radiation scanning apparatus according to claim 9.

11. each detector group is a linear detector array, the detectors comprising a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays being shorter than the first linear detector arrays, and the first linear detector arrays and the second linear detector arrays being alternately arranged around the scan area to form a polygonal structure; 10. A radiation scanning apparatus according to claim 9.

12. Each detector group of the detectors is individually detachable from each other.

10. A radiation scanning apparatus according to claim 9.

13. Each detector group of the detectors is configured to be attached and detached by moving along the transport direction of the subject.

13. A radiation scanning apparatus according to claim 12.

14. The detector groups of the detectors are configured so that some detector groups are attached and detached by moving along the transport direction of the subject, and other detector groups are attached and detached by moving along a direction perpendicular to the transport direction of the subject.

13. A radiation scanning apparatus according to claim 12.

15. each detector group of the detectors includes a detector arm, the radiation scanning device includes a support frame fixed to a mounting base of the radiation scanning device, and the detector groups are attached to or detached from the support frame by moving via the detector arms in a transport direction of the subject or in a direction perpendicular to the transport direction of the subject; 15. A radiation scanning apparatus according to claim 13 or 14.

16. each detector group of the detectors is configured to avoid radiation from a radiation source module on the same side and to receive radiation from radiation source modules on all other sides except for the radiation source module on the same side; 10. A radiation scanning apparatus according to claim 9.

17. each detector unit of the detector group includes a detector crystal for receiving radiation transmitted through the subject during a scanning period, the detector crystal being arranged at an end of the detector unit along a transport direction of the subject, and being arranged close to an edge of a radiation beam of the radiation source module on the same side as the transport direction of the subject, but not blocking the radiation beam; 10. A radiation scanning apparatus according to claim 9.

18. each radiation source module of the radiation source is positioned such that a radiation beam avoids a detector group on the same side and irradiates the detector crystal of a detector group on the opposite side; 18. Radiation scanning apparatus according to claim 17.

19. each radiation source module is configured to rotate about a target axis such that a central position of the radiation beam is irradiated onto a detector crystal of an opposite detector group; 19. Radiation scanning apparatus according to claim 18.

20. further comprising an image processing module arranged to perform data compensation and / or reconstruction image restoration for projection data loss at an end of the radiation source module to obtain a complete reconstructed image.

15. A radiation scanning apparatus according to claim 14.

21. the image processing module is configured to perform image reconstruction using an iterative method, an image restoration method, or a combination of both; 21. Radiation scanning apparatus according to claim 20.

Images