Radiographic scanning apparatus

Abstract

Embodiments of the present application provide a kind of ray scanning equipment, it includes: conveying device, which transports the object to be detected through the scanning area of ray scanning equipment;Ray source, it includes multiple ray source modules, each ray source module includes at least one ray source point of emitting ray beam, multiple ray source modules are arranged around the scanning area with the non-enclosed structure of left or right side opening of scanning area, and fixed in the plane perpendicular to the transport direction of the object to be detected;And detector, for detecting the ray transmitted through the object to be detected during scanning and including multiple detector groups, the end of multiple detector groups is connected to each other to be arranged around the scanning area, and multiple detector groups are fixed in the plane perpendicular to the transport direction of the object to be detected, wherein, the detector is located between ray source and scanning area along the vertical direction of the transport direction of the object to be detected, ray source and detector are arranged to at least partially overlap along the transport direction of the object to be detected, and multiple ray source modules can be independently disassembled and installed.

Description

Technical Field

[0001] This application relates to the field of radiation imaging, and more specifically to a radiation scanning device. Background Technology

[0002] Existing static CT (computed tomography) (distributed multi-source) or multi-view (single-source) security inspection equipment typically arranges multiple different viewpoints in different planes perpendicular or inclined to the direction of transport of the object being inspected, or concentrates all radiation sources in a single annular or rectangular enclosed cavity. The crystals of the detector array are mostly perpendicular to the center plane of the radiation beam of the radiation source, and the same set of detector arrays corresponds to only one set of distributed multi-source or one single-source.

[0003] In the existing technology, there is also a static CT with a dual-ring structure design, which simulates the working principle of a slip ring CT. The X-ray source and detector are arranged on two different rings, and the X-ray source ring and the detector ring are separated by a certain distance along the direction of transport of the object being examined. Summary of the Invention

[0004] The aforementioned static CT (distributed multi-point source) or multi-view (single-point source) devices typically contain multiple planar optical paths, which are arranged along the length of the device (i.e., the transport direction of the object being inspected). This arrangement results in a long optical path coverage area for the entire static CT (distributed multi-point source) or multi-view (single-point source) device, which is not conducive to shortening the overall length or reducing the overall weight.

[0005] Furthermore, in the device with the layout described above, a group of detector arrays corresponds to only a group of distributed multi-point sources or a single point source, thereby increasing the number of detector arrays in the whole machine, which is not conducive to reducing the cost of the whole machine.

[0006] Furthermore, in the equipment layout described above, concentrating all the radiation sources in a single annular or rectangular enclosed cavity increases the complexity of the equipment and reduces its reliability, especially for equipment that requires maintaining a high vacuum; in addition, the maintainability of the radiation sources is also poor.

[0007] Furthermore, in the static CT scanner with the dual-ring structure design described above, although the arrangement of the X-ray source ring and detector ring ensures that a single detector can be shared by multiple X-ray sources, it still does not solve the problems of poor reliability and maintainability caused by concentrating the X-ray sources in a single annular closed cavity. Simultaneously, if the distance between the X-ray source ring and the detector ring is too close, the detector can only be replaced or maintained from the inside of the ring, further reducing maintainability. If the distance between the X-ray source ring and the detector ring is large enough to allow the detector to be replaced or maintained from the outside of the ring, this arrangement increases the optical path coverage, leading to an increase in equipment length. Additionally, the angle between the X-ray beam center and the detector crystal surface causes the X-ray beam to obliquely strike the detector crystal, affecting image quality.

[0008] To address the aforementioned issues, embodiments of this application provide a radiation scanning device that solves the problems of poor reliability and maintainability caused by multiple radiation sources being concentrated in a single annular closed cavity. Furthermore, each detector group can be shared by multiple radiation source modules, thereby reducing equipment costs. In addition, it facilitates detector replacement or maintenance while minimizing the optical path coverage area, and simultaneously reduces the tilt angle between the radiation beam center and the detector surface, improving image quality.

[0009] Embodiments of this application also provide a radiation scanning device, comprising: a conveying device for transporting an object to be inspected through a scanning area of ​​the radiation scanning device; a radiation source comprising a plurality of radiation source modules, each radiation source module comprising at least one radiation source point for emitting a radiation beam, the plurality of radiation source modules being arranged above the conveying device around the scanning area and fixed in a plane perpendicular to the transport direction of the object to be inspected; and a detector for detecting radiation transmitted through the object to be inspected during scanning and comprising a plurality of detector groups, the ends of the plurality of detector groups being interconnected to be arranged around the scanning area, and the plurality of detector groups being fixed in a plane perpendicular to the transport direction of the object to be inspected, wherein the detectors are located between the radiation source and the scanning area in a direction perpendicular to the transport direction of the object to be inspected, the radiation source and the detectors are arranged to at least partially overlap along the transport direction of the object to be inspected, and the plurality of radiation source modules are independently detachable and installable.

[0010] In the X-ray scanning device according to this embodiment, the X-ray source module is arranged only above the conveying device around the scanning area, and no X-ray source module is arranged below the conveying device. The detector is arranged around the scanning area. Such an X-ray scanning device can reduce the height of the conveying device, facilitate the transfer of the object to be detected to the conveying device of the X-ray scanning device, and reduce manufacturing costs while ensuring image quality.

[0011] According to some embodiments, the radiation source module is a distributed multi-point source, and the plurality of radiation source modules form an open, non-closed structure with an opening below the transmission device around the scanning area.

[0012] According to some embodiments, each of the plurality of X-ray source modules is a linear distributed multi-point source, and the plurality of linear distributed multi-point sources are arranged on the upper, left and right sides of the scanning area, wherein the ends of the plurality of linear distributed multi-point sources are directly connected or arranged at intervals.

[0013] According to some embodiments, the plurality of radiation source modules include a plurality of first distributed multi-point sources and a plurality of second distributed multi-point sources, wherein the plurality of first distributed multi-point sources and the plurality of second distributed multi-point sources are arranged alternately, and their ends are directly connected or spaced apart.

[0014] According to some embodiments, the first distributed multi-point source is a linear distributed multi-point source, and the second distributed multi-point source is a linear distributed multi-point source or an arc-shaped distributed multi-point source with a length shorter than the first distributed multi-point source.

[0015] According to some embodiments, each of the plurality of X-ray source modules is a single-point source group, and the plurality of single-point source groups are arranged at least in the left-side view, right-side view, top view and corner oblique view above the transmission device, and each single-point source group includes at least two single-point sources.

[0016] According to some embodiments, each radiation source module has a separate cavity for housing its respective radiation generating device.

[0017] According to some embodiments, each radiation source module has a separate cavity equipped with an installation and positioning structure for installing and positioning the radiation source module, and for rotating the radiation source module to adjust the beam exit angle.

[0018] According to some embodiments, each detector group is a detector array comprising multiple detector units arranged in a closed square, rectangular, polygonal, or elliptical structure surrounding the scanning area.

[0019] According to some embodiments, each detector group is a linear detector array, the detector comprising four linear detector arrays arranged on the top, bottom, left, and right sides of the scanning area to form a rectangular or square structure.

[0020] According to some embodiments, each detector group is a linear detector array, the detector including 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 arranged alternately around the scanning area to form a polygonal structure.

[0021] According to some embodiments, the individual detector groups of the detector can be disassembled and installed independently of each other.

[0022] According to some embodiments, the individual detector groups of the detector are configured to move along the transport direction of the object being detected for disassembly and assembly.

[0023] According to some embodiments, the detector groups of the detector are configured such that a portion of the detector group moves along the transport direction of the object being detected for disassembly and installation, and another portion of the detector group moves in a direction perpendicular to the transport direction of the object being detected for disassembly and installation.

[0024] According to some embodiments, each detector group of the detector includes a detector arm, the X-ray scanning device includes a support frame fixed relative to the mounting platform of the X-ray scanning device, and the detector group is moved via the detector arm along the transport direction of the object being detected or in a direction perpendicular to the transport direction of the object being detected to be mounted to or detached from the support frame.

[0025] According to some embodiments, the detector groups of the detector are configured to avoid the radiation beams of the same-side radiation source module and receive radiation from all other side radiation source modules except the same-side radiation source module.

[0026] According to some embodiments, each detector unit of the detector group includes a detector crystal for receiving rays transmitted through the object being detected during scanning. The detector crystal is arranged at an end of the detector unit along the transport direction of the object being detected and is arranged adjacent to the edge of the ray beam of the same-side ray source module in the transport direction of the object being detected, but does not obstruct the ray beam.

[0027] According to some embodiments, the various radiation source modules of the radiation source are arranged such 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.

[0028] According to some embodiments, each X-ray source module is configured to rotate about a target axis such that the center of the X-ray beam irradiates the detector crystals of the detector group on the opposite side.

[0029] According to some embodiments, the X-ray scanning device further includes an image processing module configured to perform data compensation and / or image reconstruction for missing projection data at the end of the X-ray source module to obtain a complete reconstructed image.

[0030] According to some embodiments, the image processing module is configured to perform image reconstruction using an iterative method, an image thresholding method, or a combination of both.

[0031] Embodiments of this application also provide a radiation scanning device, comprising: a conveying device for transporting an object to be inspected through a scanning area of ​​the radiation scanning device; a radiation source comprising a plurality of radiation source modules, each radiation source module comprising at least one radiation source point for emitting a radiation beam, the plurality of radiation source modules being arranged around the scanning area in a non-closed structure with openings on the left or right side of the scanning area and fixed in a plane perpendicular to the transport direction of the object to be inspected; and a detector for detecting radiation transmitted through the object to be inspected during scanning and comprising a plurality of detector groups, the ends of the plurality of detector groups being interconnected to be arranged around the scanning area, and the plurality of detector groups being fixed in a plane perpendicular to the transport direction of the object to be inspected, wherein the detectors are located between the radiation source and the scanning area in a direction perpendicular to the transport direction of the object to be inspected, the radiation source and the detectors are arranged to at least partially overlap along the transport direction of the object to be inspected, and the plurality of radiation source modules are independently detachable and installable.

[0032] In the X-ray scanning device according to this embodiment, the X-ray source module is arranged around the scanning area on the upper, lower, left or right sides of the scanning area, and the detector is arranged around the scanning area. Such an X-ray scanning device is suitable for detecting airport carry-on baggage. Taking advantage of the characteristics of airport carry-on baggage being wide and thin, and considering the impact of self-occlusion of baggage items and X-ray attenuation on the projection data, it can reduce manufacturing costs while ensuring high image quality.

[0033] According to some embodiments, the radiation source module is a distributed multi-point source, and the plurality of radiation source modules form a non-closed structure with openings on the left or right side of the scanning area.

[0034] According to some embodiments, each of the plurality of X-ray source modules is a linear distributed multi-point source, and the plurality of linear distributed multi-point sources are respectively arranged on the upper side, lower side, and left or right side of the scanning area to form a non-closed structure with an opening on the left or right side of the scanning area, wherein the ends of the plurality of linear distributed multi-point sources are directly connected or arranged at intervals.

[0035] According to some embodiments, the plurality of radiation source modules include a plurality of first distributed multi-point sources and a plurality of second distributed multi-point sources, wherein the plurality of first distributed multi-point sources and the plurality of second distributed multi-point sources are arranged alternately, and their ends are directly connected or spaced apart.

[0036] According to some embodiments, the first distributed multi-point source is a linear distributed multi-point source, and the second distributed multi-point source is a linear distributed multi-point source or an arc-shaped distributed multi-point source with a length shorter than the first distributed multi-point source.

[0037] According to some embodiments, each of the plurality of X-ray source modules is a single-point source group, and the plurality of single-point source groups are arranged at least in the top view, bottom view, left view or right view and at least part of the corner oblique view of the scanning area, and each single-point source group includes at least two single-point sources.

[0038] According to some embodiments, each radiation source module has a separate cavity for housing its respective radiation generating device.

[0039] According to some embodiments, the cavity of each X-ray source module includes a separate vacuum cavity for accommodating multiple target points.

[0040] 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.

[0041] According to some embodiments, each radiation source module has a separate cavity equipped with an installation and positioning structure for installing and positioning the radiation source module, and for rotating the radiation source module to adjust the beam exit angle.

[0042] According to some embodiments, each detector group is a detector array comprising multiple detector units arranged in a closed square, rectangular, polygonal, or elliptical structure surrounding the scanning area.

[0043] According to some embodiments, each detector group is a linear detector array, the detector comprising four linear detector arrays arranged on the top, bottom, left, and right sides of the scanning area to form a rectangular or square structure.

[0044] According to some embodiments, each detector group is a linear detector array, the detector including 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, the plurality of first linear detector arrays and the plurality of second linear detector arrays being arranged alternately around the scanning area to form a polygonal structure.

[0045] According to some embodiments, the individual detector groups of the detector can be disassembled and installed independently of each other.

[0046] According to some embodiments, the detector groups on the upper and lower sides of the scanning area and at the opening of the X-ray source structure are configured to move perpendicular to the transport direction of the object being detected for disassembly and installation, and the detector groups on the opposite side of the opening of the X-ray source structure are configured to move along the transport direction of the object being detected for disassembly and installation.

[0047] According to some embodiments, each detector group of the detector includes a detector arm, and the X-ray scanning device includes a support frame fixed relative to the mounting platform of the X-ray scanning device, wherein the detector group is mounted to or detached from the support frame via the detector arm.

[0048] According to some embodiments, the detector groups of the detector are configured to avoid the radiation beams of the same-side radiation source module and receive radiation from all other side radiation source modules except the same-side radiation source module.

[0049] According to some embodiments, each detector unit of the detector group includes a detector crystal for receiving rays transmitted through the object being detected during scanning. The detector crystal is arranged at an end of the detector unit along the transport direction of the object being detected and is arranged adjacent to the edge of the ray beam of the same-side ray source module in the transport direction of the object being detected, but does not obstruct the ray beam.

[0050] According to some embodiments, the various radiation source modules of the radiation source are arranged such 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.

[0051] According to some embodiments, each X-ray source module is configured to rotate about a target axis such that the center of the X-ray beam irradiates the detector crystals of the detector group on the opposite side.

[0052] According to some embodiments, the X-ray scanning device further includes an image processing module configured to perform data compensation and / or image reconstruction for missing projection data at the end of the X-ray source module to obtain a complete reconstructed image.

[0053] According to some embodiments, the image processing module is configured to perform image reconstruction using an iterative method, an image thresholding method, or a combination of both.

[0054] Embodiments of this application also provide a radiation scanning device, comprising a conveying device for transporting an object to be inspected through a scanning area of ​​the radiation scanning device; a radiation source comprising a plurality of radiation source modules, each radiation source module comprising at least one radiation source point for emitting a radiation beam, and viewed along the transport direction of the object to be inspected, the plurality of radiation source modules being arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area; and a detector for detecting radiation transmitted through the object to be inspected during scanning and comprising a plurality of detector groups, viewed along the transport direction of the object to be inspected, the ends of the plurality of detector groups being interconnected and arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area, wherein the openings of the non-closed structures of the radiation sources and the openings of the non-closed structures of the detectors are arranged opposite to each other, and the plurality of detector groups of the detectors are fixed in the same plane perpendicular to the transport direction of the object to be inspected, and the plurality of radiation source modules of the radiation source are arranged in a plurality of different planes perpendicular to the transport direction of the object to be inspected.

[0055] In the X-ray scanning device according to this embodiment, both the X-ray source and the detector surround the scanning area on only three sides. Compared to the case where the scanning area is surrounded on four sides (which may be one or both of the X-ray source and the detector), sufficient data can be acquired for image reconstruction, and the device cost and weight can be reduced, thereby providing a lightweight X-ray scanning device.

[0056] According to some embodiments, the radiation source module located on the open side of the non-closed structure of the detector is fixed in the same plane perpendicular to the transport direction of the object being detected, along with multiple detector groups of the detector. Other radiation source modules of the radiation source are fixed in other planes perpendicular to the transport direction of the object being detected.

[0057] According to some embodiments, other radiation source modules of the radiation source are fixed in another plane perpendicular to the transport direction of the object being detected.

[0058] According to some embodiments, the plurality of radiation source modules can be disassembled and installed independently of each other.

[0059] According to some embodiments, each of the plurality of X-ray source modules is a distributed multi-point source. When viewed along the transport direction of the object being detected, the plurality of distributed multi-point sources are respectively arranged on three sides of the scanning area to form a non-closed structure with an opening on one side of the scanning area.

[0060] According to some embodiments, the distributed multi-point source is in the shape of a straight line, an arc, a broken line, or any combination thereof, so that the X-ray source appears as a right-angled rectangle, a rounded rectangle, a polygon, or an ellipse with an opening on one side of the scanning area when viewed from the transport direction of the object being detected.

[0061] According to some embodiments, each of the plurality of X-ray source modules is a single-point source group, and each single-point source group includes at least two single-point sources.

[0062] According to some embodiments, each radiation source module has a separate cavity for housing its respective radiation generating device.

[0063] According to some embodiments, the cavity of each X-ray source module includes a separate vacuum cavity for accommodating multiple target points.

[0064] 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.

[0065] According to some embodiments, each radiation source module has a separate cavity equipped with an installation and positioning structure for installing and positioning the radiation source module, and for rotating the radiation source module to adjust the beam exit angle.

[0066] According to some embodiments, each detector group is a detector array comprising multiple detector elements, including a linear detector array, an arc detector array, or a combination of both.

[0067] According to some embodiments, each detector group is a linear detector array, the detector comprising three linear detector arrays respectively arranged on three sides of the scanning area, forming a rectangular or square structure with an opening on one side of the scanning area.

[0068] According to some embodiments, each detector group is a linear detector array, the detector including 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, the plurality of first linear detector arrays and the plurality of second linear detector arrays being arranged alternately around the scanning area to form a polygonal structure with an opening on one side of the scanning area.

[0069] According to some embodiments, the individual detector groups of the detector can be disassembled and installed independently of each other.

[0070] According to some embodiments, the detector array of the detector is configured to move perpendicular or parallel to the transport direction of the object being detected for disassembly and installation.

[0071] According to some embodiments, each detector group of the detector includes a detector arm, and the X-ray scanning device includes a support frame fixed relative to the mounting platform of the X-ray scanning device, wherein the detector group is mounted to or detached from the support frame via the detector arm.

[0072] According to some embodiments, when viewed from the transport direction of the object being detected, the detector is arranged between the X-ray source and the scanning area; and along the transport direction of the object being detected, the other X-ray source modules at least partially overlap with the detector group on the same side.

[0073] According to some embodiments, the detector group on the same side as the other radiation source modules is configured to avoid the radiation beams from the same-side radiation source modules and receive radiation from all other side radiation source modules except the same-side radiation source module.

[0074] According to some embodiments, each detector unit of the detector group includes a detector crystal for receiving rays transmitted through the object being detected during scanning, and the detector crystal is arranged at an end of the detector unit along the transport direction of the object being detected.

[0075] The detector crystals of the detector group on the same side as the other X-ray source modules are arranged so that they are close to the edge of the X-ray beam of the same-side X-ray source module in the direction of transport of the object being detected, but do not block the X-ray beam.

[0076] According to some embodiments, other radiation source modules of the radiation source are arranged such 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.

[0077] According to some embodiments, the other radiation source module is configured to rotate about the target axis such that the center of the radiation beam irradiates the detector crystals of the detector group on the opposite side.

[0078] According to some embodiments, the X-ray scanning device further includes an image processing module configured to perform data compensation and / or image reconstruction repair for missing projection data at the end of the X-ray source module to obtain a complete reconstructed image.

[0079] According to some embodiments, the image processing module is configured to perform image reconstruction using an iterative method, an image thresholding method, or a combination of both.

[0080] Embodiments of this application provide an installation and positioning structure for a radiation source of a radiation scanning device. The radiation scanning device includes a radiation source and a fixedly mounted support frame. The installation and positioning structure includes a main body that can be fixedly connected to the radiation source and the support frame, allowing the radiation source to be fixedly installed onto the support frame via the main body. The installation and positioning structure further includes: a moving device that allows the radiation source to be moved to a predetermined installation position on a first plane; a first positioning device for positioning the radiation source on the first plane; a lifting device for adjusting the position of the radiation source along a first direction, wherein the first direction is perpendicular to the first plane; and a second positioning device for fixing the position of the radiation source in the first direction.

[0081] Using the installation and positioning structure according to the above embodiment, each radiation source module of the radiation source can be disassembled and installed individually, and the beam output angle of the radiation source module can also be adjusted.

[0082] According to some embodiments, the moving device includes rollers disposed at both ends of the radiation source along its length.

[0083] According to some embodiments, the first positioning device includes a first positioning pin and a first pin hole corresponding to the first positioning pin disposed on the body and the support frame.

[0084] According to some embodiments, the lifting device is disposed at both ends of the radiation source along its length, wherein the lifting device at one end is formed as a liftable roller, and the lifting device at the other end is formed as a lifting top screw.

[0085] According to some embodiments, the second positioning device is formed as a positioning pad, which is placed below the main body after the radiation source is adjusted to a predetermined position along the first direction by the lifting device.

[0086] According to some embodiments, the mounting and positioning structure further includes an adjustment device for rotating the X-ray source along a predetermined axis to adjust the beam exit angle of the X-ray source.

[0087] According to some embodiments, the radiation source is provided with a mounting shaft, and the main body is provided with a corresponding shaft hole. The main body is mounted on the mounting shaft of the radiation source through the shaft hole. The positioning and mounting structure further includes a positioning element and a fastener. The main body is positioned relative to the radiation source by the positioning element and the engagement of the shaft hole with the mounting shaft, and is fixedly connected to the radiation source by the fastener. The adjusting device includes a rotation driving device, which can drive the radiation source to rotate around the mounting shaft when the positioning element and the fastener are loosened.

[0088] According to some embodiments, the rotation drive device includes an adjustment block fixed to the radiation source and a set wire disposed on the main body that abuts against the adjustment block. The set wire can be rotated to push the adjustment block to move, thereby causing the radiation source to rotate.

[0089] According to some embodiments, the positioning element includes a second positioning pin and corresponding second pin holes formed on the body and the radiation source, and the fastener includes a fixing bolt and corresponding threaded holes formed on the body and the radiation source.

[0090] According to some embodiments, a radiation scanning device is also provided, which includes a radiation source and a fixed support frame, wherein the radiation source is fixedly mounted on the support frame via the mounting and positioning structure described in any of the above embodiments.

[0091] According to some embodiments, the X-ray scanning device rotates the X-ray source via the mounting and positioning structure to adjust the beam exit angle of the X-ray source.

[0092] Embodiments of this application also provide a mounting and fixing structure for a detector in a radiographic scanning device. The radiographic scanning device includes the detector and a fixedly mounted support frame. The detector includes one or more detector groups, which are fixedly mounted to or detached from the support frame via the mounting and fixing structure. The mounting and fixing structure includes: a first mounting part fixedly mounted on the detector group; a second mounting part fixedly mounted on the support frame and capable of linearly moving and engaging with the first mounting part, wherein the detector group can move along the second mounting part to a predetermined mounting position when the first mounting part and the second mounting part are engaged; and a fixing device disposed on one side of the detector group along its width direction for fixing the detector group relative to a mounting reference surface on the support frame.

[0093] Using the mounting and fixing structure according to the above embodiment, each detector group of the detector can be disassembled and installed individually. It can be disassembled and maintained without disassembling the radiation source module when the detector group is arranged inside the radiation source module, which improves the convenience of disassembly, assembly and maintenance of the detector group.

[0094] According to some embodiments, the second mounting part is further configured to support the detector assembly at the predetermined mounting position when cooperating with the first mounting part.

[0095] According to some embodiments, the first mounting portion includes a slider that extends along the length of the detector group, and the second mounting portion includes a fixed guide rail that cooperates with the slider.

[0096] According to some embodiments, the fixing device includes a fastener and a positioning member disposed on the support frame, the end face of the positioning member away from the support frame being formed as the mounting reference surface for abutting against the surface of the detector assembly on one side in the width direction, the fastener passing through the positioning member and securing the detector assembly relative to the end face of the positioning member.

[0097] According to some embodiments, the slider is disposed on opposite sides of the detector group along the width direction and has an inner extension extending inward from the edges of the opposite sides of the detector group along the width direction; the fixed guide rail includes an outer extension extending outward on opposite sides along the width direction; when the first mounting part and the second mounting part are engaged, the inner extension of the slider is located above the outer extension of the fixed guide rail and the two are in contact and overlapped to suspend the detector group on the fixed guide rail.

[0098] According to some embodiments, the fixed guide rail supports the slider below the slider.

[0099] According to some embodiments, the first mounting portion is formed as a groove extending along the width direction of the detector group, and the second mounting portion is formed as a slide bar that cooperates with the groove.

[0100] According to some embodiments, a protrusion is formed at one end of the slide bar near the support frame, and the surface of the protrusion facing the detector group is formed as the mounting reference surface for abutting against the surface of the detector group on the other side in the width direction.

[0101] According to some embodiments, the fixing device is disposed at the other end of the slide bar opposite to the protrusion, and is arranged to abut against both sides of the detector group in the width direction, respectively, with respect to the protrusion.

[0102] According to some embodiments, the fixing device includes a positioning sleeve and a fastener, the positioning sleeve being fitted onto the other end of the slide rod and abutting against one side of the detector in the width direction, and the fastener being used to fix the positioning sleeve to the other end of the slide rod.

[0103] According to some embodiments, the second mounting portion includes two slide rods, and the first mounting portion includes two slide grooves formed at both ends of the detector group along its length direction. The two slide rods and the two slide grooves respectively cooperate with each other to position the detector group at the predetermined mounting position.

[0104] According to some embodiments, the first mounting portion is formed as a fixing block fixed on one side of the detector group along the width direction, the fixing block having an opening facing the side of the detector group in the thickness direction; the second mounting portion is formed as a cantilever portion fixed on the support frame, the end of the cantilever portion away from the support frame is provided with an extension portion, the extension portion being capable of linearly moving and engaging with the opening of the fixing block.

[0105] According to some embodiments, the fixing device includes a fixing member and a fastener disposed on the support frame, wherein the end face of the fixing member away from the support frame is formed as the mounting reference surface for abutting against the surface of the detector assembly on one side in the width direction, and the fastener is used to secure the detector assembly relative to the end face of the fixing member.

[0106] According to some embodiments, when the first mounting part and the second mounting part are engaged, the cantilever part supports the detector group at the predetermined installation position by means of the fixing block.

[0107] According to some embodiments, a radiation scanning device is also provided, which includes a detector and a fixed support frame. The detector includes one or more detector groups, which are mounted and fixed to the support frame or removed from the support frame by the mounting and fixing structure as described in any of the above embodiments.

[0108] According to some embodiments, the width direction of the detector group is parallel to the transport direction of the object being detected, and the length and thickness directions of the detector group are perpendicular to the transport direction of the object being detected. The transport direction of the object being detected is the direction in which the object being detected is transported through the scanning area of ​​the X-ray scanning device.

[0109] According to some embodiments, when the detector comprises multiple detector groups, the mounting reference planes for each of the multiple detector groups are located in the same plane perpendicular to the transport direction of the object being detected.

[0110] According to some embodiments, the direction in which the first mounting part moves linearly relative to the second mounting part is parallel or perpendicular to the conveying direction of the object being detected.

[0111] Other features and technical advantages of this application will become clearer from the following detailed description with reference to the accompanying drawings and other embodiments. Attached Figure Description

[0112] Figure 1 This is a schematic diagram of the structure of a X-ray scanning device according to some embodiments of this application;

[0113] Figure 2Some embodiments according to this application Figure 1 A schematic diagram of the specific structure of the X-ray source and detector of the X-ray scanning equipment shown;

[0114] Figure 3 This is a schematic diagram of the beam shape of a radiation source according to some embodiments of this application;

[0115] Figure 4 This is a schematic diagram of the distribution of radiation sources in the form of target points, according to some embodiments of this application;

[0116] Figure 5 This is a schematic diagram of the installation and positioning structure of the X-ray source module according to some specific embodiments;

[0117] Figure 6 This is a schematic diagram of the detector distribution according to some embodiments;

[0118] Figure 7 This is a schematic diagram of the structure of a linear detector array according to some embodiments;

[0119] Figure 8 This is a schematic diagram of the detector unit according to some embodiments;

[0120] Figure 9 This is a schematic diagram of the mounting and fixing structure of the detector assembly according to some embodiments;

[0121] Figure 10 This is a schematic diagram showing the correspondence between a radiation source module and a detector group that receives its radiation, according to some embodiments.

[0122] Figure 11 According to some embodiments Figure 1 A schematic diagram of the cross-sectional structure of the X-ray scanning device along the centerline of the transport direction of the object being inspected;

[0123] Figure 12 This is a top view schematic diagram of the layout of the detector and the radiation source according to some embodiments;

[0124] Figure 13 This is a schematic diagram of a combination of a detector and a radiation source according to some embodiments;

[0125] Figure 14 Based on some embodiments Figure 13 A schematic diagram showing the disassembly direction of the detector assembly in the combination of the detector and the radiation source;

[0126] Figure 15 It is a mounting and fixing structure suitable for detector groups according to some embodiments;

[0127] Figure 16It is a mounting and fixing structure suitable for detector arrays according to some other embodiments;

[0128] Figure 17 It is a mounting and fixing structure suitable for detector arrays according to some other embodiments;

[0129] Figure 18 This is a schematic diagram of the arrangement of the X-ray source and detector in a X-ray scanning device according to some embodiments;

[0130] Figure 19 This is a three-dimensional schematic diagram of the layout of the X-ray source and detector of a X-ray scanning device according to some embodiments;

[0131] Figure 20 yes Figure 19 A side view along the Z-axis of the X-ray scanning equipment showing the layout of the X-ray source and detector.

[0132] Figure 21 yes Figure 19 A top view of the layout of the X-ray source and detector in the X-ray scanning equipment shown;

[0133] Figure 22 This is a schematic diagram of the distribution of a single point source of the X-ray source in a X-ray scanning device according to some embodiments;

[0134] Figure 23 This is a schematic diagram of the detector structure of a ray scanning device according to some embodiments; and

[0135] Figure 24 This is a schematic diagram of the disassembly and assembly direction of the detector according to some embodiments. Detailed Implementation

[0136] To clearly describe the technical problem to be solved, the technical solution, and the beneficial effects of this application, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0137] To address the aforementioned technical problems, embodiments of this application provide a radiation scanning device, comprising: a conveying device for transporting an object to be inspected through a scanning area of ​​the radiation scanning device; a radiation source comprising a plurality of radiation source modules, each radiation source module including at least one radiation source point emitting a radiation beam, the plurality of radiation source modules being arranged around the scanning area and fixed in a plane perpendicular to the transport direction of the object to be inspected; and a detector for detecting radiation transmitted through the object to be inspected during scanning and comprising a plurality of detector groups, the ends of the plurality of detector groups being interconnected to be arranged around the scanning area, the plurality of detector groups being fixed in a plane perpendicular to the transport direction of the object to be inspected; wherein the detector is located between the radiation source and the scanning area in a direction perpendicular to the transport direction of the object to be inspected, the radiation source and the detector are arranged to at least partially overlap along the transport direction of the object to be inspected, and the plurality of radiation source modules can be independently disassembled and installed.

[0138] According to the X-ray scanning device of this application, the X-ray source is formed by arranging multiple X-ray source modules around the scanning area, and the multiple X-ray source modules can be disassembled and installed independently of each other. That is, each X-ray source module has a separate cavity to accommodate its own X-ray generating device. Compared with an integrated X-ray source surrounding the scanning area, the X-ray source of this application, which is formed by combining multiple X-ray source modules, can reduce the size of the outer shell of a single X-ray source module and the volume of the internal vacuum cavity, making the single X-ray source module small in size and light in weight, thereby facilitating the disassembly and installation of the X-ray source. In addition, multiple target points of a single X-ray source module can use separate vacuum cavities, thus reducing the risk of internal arcing during X-ray source maintenance.

[0139] According to some embodiments of this application, each X-ray source module has a separate cavity equipped with a mounting and positioning structure. This structure is used to fix the X-ray source module in a relative position within the X-ray scanning equipment, such as positioning the X-ray source module relative to a support frame. It is also used to rotate the X-ray source module about a predetermined axis to adjust the beam exit angle. Furthermore, this mounting and positioning structure allows the position of each X-ray source module to be determined, thereby ensuring that multiple X-ray source modules are located in a plane perpendicular to the transport direction of the object being inspected (e.g., in the same plane or in different planes) after installation.

[0140] Preferably, the X-ray source module can be a distributed multi-point source to form a ring structure around the scanning area, such as a rectangular ring, a polygonal ring, or an elliptical ring. Specifically, the X-ray source module can be a linear distributed multi-point source, and each X-ray source module can include multiple target points. Multiple X-ray source modules can be distributed on the upper, lower, left, and right sides of the scanning area to form a rectangular ring around the scanning area. The ends of the X-ray source modules can be directly connected to form a continuous rectangular ring, or they can be spaced apart to form a non-continuous rectangular ring. According to other embodiments, the X-ray source may further include multiple shorter linear distributed multi-point sources, which may be alternated with multiple longer linear distributed multi-point sources and directly connected at their ends to form a continuous polygonal arrangement, or the ends may be spaced apart to form a discontinuous polygonal arrangement; or, the X-ray source may further include multiple shorter arc-shaped distributed multi-point sources, which may be alternated with multiple longer linear distributed multi-point sources and directly connected at their ends to form a continuous rounded rectangular arrangement, or the ends may be spaced apart to form a discontinuous rounded rectangular arrangement; or, the X-ray source may also include other numbers, shapes, and / or lengths of X-ray source modules to form other polygonal or elliptical structures, etc.

[0141] In addition, each radiation source module of the radiation source can also be a single-point source group, and each single-point source group includes at least two single-point sources. Preferably, multiple single-point source groups of the radiation source are distributed around the bottom view, left and right side view, top view and corner oblique view around the scanning area to form a multi-view arrangement.

[0142] Furthermore, according to other embodiments, the X-ray source module can also be arranged around the scanning area only on three sides, such as the top, left, and right sides, or the top and bottom sides and the left or right side, etc. (Here, it should be noted that in this document, the top, bottom, left, and right sides of the scanning area refer to the top, bottom, left, and right sides when observing the scanning area along the transport direction of the object being detected). Thus, the X-ray source can be arranged as a non-closed structure with an opening on one side of the scanning area, such as a rectangular structure, polygonal structure, or elliptical structure with an opening on one side. More specifically, it can be a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal structure, or a discontinuous rounded rectangle structure, as well as other polygonal and elliptical structures, etc., with an opening on one side of the scanning area. When the X-ray source consists of a single-point source, a single-point source may not be provided on one side of the scanning area.

[0143] In the X-ray scanning device of this application, the detector is a structure surrounding the scanning area formed by interconnecting the ends of multiple detector groups. Preferably, in conjunction with the various X-ray source arrangements described above, such as structures surrounding the scanning area on the top, bottom, left, and right sides, or non-closed structures with openings on one side of the scanning area, such as rectangular, polygonal, or elliptical structures with openings on one side of the scanning area (more specifically, such as continuous or discontinuous rectangular structures, continuous or discontinuous polygonal structures, continuous or discontinuous rounded rectangular structures, and single-point source multi-view arrangements with openings on one side of the scanning area), the multiple detector groups of the detector are arranged into closed rectangular, square, polygonal, or elliptical structures surrounding the scanning area. Specifically, each detector group of the detector may include multiple detector units and detector arms, with the multiple detector units arranged in a straight line on the detector arms. The detector may include four detector groups respectively 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 longer detector groups and multiple shorter detector groups to form a closed polygonal structure surrounding the scanning area. Alternatively, according to other embodiments, in conjunction with the non-closed structure of the X-ray source with an opening on one side of the scanning area, the multiple detector groups of the detector can also be arranged in a non-closed structure with an opening on one side surrounding the scanning area, such as a rectangular structure, square structure, polygonal structure or elliptical structure with an opening on one side.

[0144] According to some embodiments, the detector's multiple detector groups are configured to be independently detachable and installable. This allows each detector group to be disassembled and installed individually, facilitating detector maintenance. Furthermore, the detector's multiple detector groups can be configured to move along the transport direction of the object being inspected for disassembly and assembly. Alternatively, when the X-ray source is arranged in a non-closed structure with an opening on one side of the scanning area, the detector's multiple detector groups can be configured such that one part moves perpendicular to the transport direction of the object being inspected for disassembly and assembly, and another part moves along the transport direction of the object being inspected for disassembly and assembly. Thus, even when the detector is arranged inside the X-ray source perpendicular to the transport direction of the object being inspected, the detector groups can be disassembled, assembled, and maintained without disassembling the X-ray source module, thereby improving the ease of operation for detector disassembly, assembly, and maintenance.

[0145] Furthermore, according to some embodiments, the assembly and disassembly of the detector group can be accomplished by means of linear movement between the detector arm of the detector group and its mounting part in the X-ray scanning equipment, such as the support frame of the X-ray scanning equipment, such as linear sliding or linear rolling. For example, it can be a slider guide rail or a linear ball bearing and a cylindrical shaft.

[0146] Furthermore, according to some embodiments, each detector unit of the detector group includes a detector crystal for receiving radiation, and the detector units of each detector group are arranged on the detector arm with the detector crystals facing the same direction. Additionally, as mentioned above, in this application, the respective detector groups are located in a plane perpendicular to the transport direction of the object being detected, particularly in the same plane. This specifically means that the detector crystals of the respective detector groups are located in the same plane perpendicular to the transport direction of the object being detected. According to other embodiments, the respective detector groups may also be located in different planes perpendicular to the transport direction of the object being detected.

[0147] In the X-ray scanning apparatus according to this application, the X-ray source of any embodiment described above is combined with the detector of any embodiment described above. In the combined state, each X-ray source module of the X-ray source is located in a plane (one or more planes) perpendicular to the transport direction of the object being detected, and each detector group of the detector is located in other planes perpendicular to the transport direction of the object being detected (partially the same plane). The detector is located inside the X-ray source in the direction perpendicular to the transport direction, and the X-ray source and detector are arranged to at least partially overlap in the transport direction of the object being detected. The at least partial overlap of the X-ray source and detector in the transport direction of the object being detected can reduce the arrangement length of the X-ray source and detector, thereby helping to reduce the length of the entire X-ray scanning system.

[0148] In some embodiments, the detector groups are arranged so as not to block the beams of the radiation source modules on the same side, while being able to receive radiation from the radiation source modules on the other sides, so that different radiation source modules can share the same detector groups, thereby reducing the total number of detectors.

[0149] In some embodiments, the detector crystals of each detector group of the detector are arranged at the end of the detector unit along the transport direction of the object being detected, and are arranged to be adjacent to the edge of the X-ray beam of the X-ray source module on the same side in the transport direction of the object being detected, but without obstructing the X-ray beam of the X-ray source module on the same side. In this way, the coverage length of the optical path between the X-ray source and the detector can be minimized as much as possible, thereby further reducing the length of the equipment.

[0150] In some embodiments, each X-ray source module is arranged such that the X-ray 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 X-ray source module can rotate relative to a predetermined axis, such as a target axis (e.g., by means of the aforementioned mounting and positioning structure of the X-ray source module) to adjust the exit angle of the X-ray beam, thereby irradiating the detector crystal of the detector group on the opposite side with the center position of the X-ray beam from the X-ray 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 being detected and is arranged close to the edge of the X-ray beam of the same side X-ray source, the X-ray source module only needs to rotate a very small angle to irradiate the detector crystal with the center position of the X-ray beam, thereby minimizing the adverse effects of the X-ray beam obliquely entering the surface of the detector crystal on imaging. The adjustment of the exit angle of the X-ray source can also be achieved by setting the opening direction of the X-ray source module, adjusting the collimator, or other suitable methods.

[0151] According to some embodiments, the image processing module of the X-ray scanning device of this application is configured to have a data compensation function, which can compensate for missing viewpoint data and / or repair reconstructed images to improve image quality. Specifically, the image processing module is configured to perform image reconstruction using an iterative method, an image threshold repair method, or a combination of both. Thus, the missing projection data caused by the increased target point spacing at the ends of adjacent X-ray source modules can be compensated for, thereby improving the quality of the reconstructed image.

[0152] The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0153] Figure 1 A radiographic scanning apparatus according to some embodiments of this application is illustrated schematically. Figure 1The X-ray scanning equipment shown includes a conveyor 1, a channel 2, a radiation source 3, a detector 4, and a support frame 5. The conveyor 1 transports the object to be inspected 6 through the scanning area of ​​the X-ray scanning equipment, which is defined by the radiation source 3 and the detector 4. Driven by the conveyor 1, the object to be inspected 6 enters the channel 2 through an opening at one end and exits through an opening at the other end. The channel 2 can shield the radiation from the radiation source 3 relative to the external environment, preventing radiation damage to people near the equipment, and also limits the volume of the object to be inspected 6 entering the channel 2. The radiation source 3 is fixed to the support frame 5 on the outside of the channel 2 and is used to emit a radiation beam to irradiate the object to be inspected 6 during scanning. The detector 4 is also fixed to the support frame 5 on the outside of the channel 2 and is used to detect the radiation transmitted through the object to be inspected 6 during scanning. The support frame 5 supports and fixes the conveyor 1, channel 2, radiation source 3, detector 4, etc., and is fixed relative to the ground. It should be noted that although both the X-ray source 3 and the detector 4 are located outside the channel 2, the channel 2 has a clearance area in the scanning area, which will not block the X-ray beam of the X-ray source 3, nor will it hinder the detector 4 from receiving the X-ray.

[0154] The X-ray scanning device according to an embodiment of this application may further include a control device, which can control the operation of various components of the X-ray scanning device, such as controlling the emission of X-rays from the X-ray source 3 and the data output of the detector 4. The control device may also include an image processing module, which can reconstruct the image based on the information output by the detector 4 to obtain a scanned image of the object 6 being detected.

[0155] The conveying device 1 may be, for example, a conveyor belt; the object to be inspected 6 may be, for example, a package, luggage, or other items that require security inspection.

[0156] The X-ray source 3 may include multiple X-ray source modules, each arranged around the scanning area and located in a plane perpendicular to the transport direction of the object being inspected 6. The X-ray source modules may be arranged in the same plane or different planes perpendicular to the transport direction of the object being inspected 6. This embodiment describes the case where the X-ray source modules are located in the same plane perpendicular to the transport direction of the object being inspected 6 (specifically, the X-ray openings of each X-ray source module are located in the same plane perpendicular to the transport direction of the object being inspected 6), but this also applies to cases where the X-ray source modules are located in different planes. Figure 1 The image shows the forward direction Z of the detected object 6. The conveying direction of the detected object 6 (hereinafter sometimes referred to as the conveying direction or Z direction) is defined as the forward direction of the detected object 6, including the reverse direction of the forward direction. Figure 1The diagram shows an XYZ coordinate system, which can be used as a reference coordinate system to describe the positions of components in the X-ray scanning device. These positional descriptions are for the purpose of clearly describing the principles of this application and are not intended to be limiting. The forward direction Z of the object being detected 6 is the same as the Z-axis of this XYZ coordinate system.

[0157] According to some embodiments, each of the radiation source modules of the radiation source 3 of the radiation scanning device according to the embodiments of this application can be a distributed multi-point source. Multiple radiation source modules can be arranged in a rectangular structure, polygonal structure, elliptical structure, etc., surrounding the scanning area, wherein part of the structure is located below the transmission device 1 to completely surround the transmission device 1.

[0158] Specifically, as a distributed multi-point source, each radiation source module can have multiple target points, and each target point in each radiation source module can generate a radiation beam independently. Furthermore, each target point can generate a radiation beam according to a predetermined timing sequence under the control of a control device. The radiation beam can be a fan-shaped beam with an angle A, such as... Figure 3 As shown. Of course, the shape of the ray beam is not limited to a fan-shaped beam; it can also be a cone-shaped beam, a parallel beam, or other shapes, which can be specifically set according to needs.

[0159] The specific arrangement of X-ray source 3 is as follows. Figure 2 A schematic diagram of a radiation source and detector according to some embodiments is shown, wherein multiple radiation source modules of radiation source 3 are arranged in a rectangular structure surrounding a scanning area. Specifically, radiation source 3 includes four radiation source modules 31, 32, 33, and 34, each of which is a linearly distributed multi-point source (i.e., multiple target points are arranged in a straight line). The four radiation source modules 31, 32, 33, and 34 are respectively arranged on the upper, lower, left, and right sides of the scanning area, forming a rectangular structure surrounding the scanning area. The ends of radiation source modules 31, 32, 33, and 34 are spaced apart by a certain distance, thus forming a non-continuous rectangular structure (e.g., ...). Figure 4 As shown in (a), the target points are also arranged in discontinuous rectangles.

[0160] The arrangement of X-ray source 3 is not limited to Figure 2 and Figure 4 The embodiment shown in (a) may also include other alternative arrangements. For example, the ends of the X-ray source modules 31, 32, 33, and 34 may be directly connected, so that the X-ray sources 3 are arranged in a continuous rectangular structure around the scanning area (e.g., Figure 4 As shown in (b), the target points are arranged in a continuous rectangular pattern. Furthermore, the radiation source 3 can... Figure 2The illustrated embodiment also includes four additional linear distributed X-ray source modules 35, 36, 37, and 38, which are shorter than X-ray source modules 31, 32, 33, and 34. These modules are arranged alternately with X-ray source modules 31, 32, 33, and 34 and their ends are directly connected, resulting in the X-ray source 3 being arranged in a continuous polygonal structure (e.g., ...). Figure 4 As shown in (c), the target points are arranged in a continuous polygonal pattern. Furthermore, the X-ray source modules 35, 36, 37, and 38 can be arc-shaped distributed X-ray sources, alternating with X-ray source modules 31, 32, 33, and 34 and directly connected at their ends, so that the X-ray source 3 is arranged in a continuous rounded rectangular structure. Of course, the ends of the X-ray source modules 31, 32, 33, 34, 35, 36, 37, and 38 can also be spaced apart, so that the X-ray source 3 is arranged in a non-continuous polygonal structure or a non-continuous rounded rectangular structure (not shown in the figures). Furthermore, the lengths of the X-ray source modules 35, 36, 37, and 38 can be the same as or longer than the lengths of the X-ray source modules 31, 32, 33, and 34; or, the X-ray source 3 can include other numbers (multiples) and / or lengths of X-ray source modules, thereby forming a continuous polygonal pattern. Figure 4 The polygon shown in (c) has different polygonal structures. In addition, the ray source 3 may include other numbers (multiples), lengths and / or shapes of ray source modules, thereby forming an elliptical structure.

[0161] In some embodiments, the radiation source modules included in the radiation source 3 are independently detachable and installable; that is, each radiation source module has a separate cavity to house its respective radiation generating device. Each radiation source module having a separate cavity means that multiple target points of each radiation source module share a single vacuum cavity. The spacing between the multiple target points within the vacuum cavity of each radiation source module 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 a single radiation source module can be 192, 264, etc., and the spacing between target points in a single radiation source module can be 4 mm, 12 mm, etc. It should be noted that the spacing between target points at the ends of adjacent radiation source modules is greater than the spacing between target points within a single radiation source module, even when the ends of adjacent radiation source modules are directly connected, i.e., two separate cavities are directly connected. Each X-ray source module has a separate cavity, which has the following advantages: Compared with an integrated annular cavity X-ray source (i.e., all target points of the X-ray source are located in the same annular vacuum cavity), the outer shell size and internal vacuum cavity volume of a single X-ray source module can be reduced, making the individual X-ray source module smaller and lighter, thus facilitating the disassembly and installation of the X-ray source; in addition, the use of a separate vacuum cavity for each X-ray source module can reduce the risk of internal arcing when maintaining the X-ray source module.

[0162] Furthermore, according to some embodiments, each radiation source module of the radiation source 3 is provided with a mounting and positioning structure to facilitate the installation and adjustment of the radiation source modules. With the aid of the mounting and positioning structure, each radiation source module of the radiation source 3 can be installed and fixed at a predetermined position in the radiation scanning equipment (e.g., a specific position in the radiation scanning equipment relative to the XYZ reference coordinate system), ensuring, for example, that multiple radiation source modules are located in the same plane perpendicular to the transport direction of the object being inspected 6. Furthermore, with the aid of the mounting and positioning structure, the radiation source modules can also be rotated to adjust the beam exit angle.

[0163] The various radiation source modules of radiation source 3 can be installed in different ways and have different installation and positioning structures due to their different positions in the radiation scanning equipment. For example, radiation source modules located above and to the side of the scanning area can be installed by hoisting using equipment such as overhead cranes. However, radiation source modules located below the scanning area are not suitable for hoisting and require other installation methods. To facilitate the installation of such radiation source modules, embodiments of this application provide an installation and positioning structure that can easily install and fix radiation source modules unsuitable for hoisting at predetermined positions in the radiation scanning equipment, and can also rotate the radiation source modules to adjust the beam exit angle. According to some embodiments, the installation and positioning structure includes a main body that can be fixedly connected to the support frame of the radiation source module and the radiation scanning equipment, so that the radiation source module can be fixedly installed to the support frame through the main body. The installation and positioning structure includes a moving device through which the radiation source module can be moved on a first plane (e.g., Figure 1 The XZ plane is moved to a predetermined installation position; a first positioning device positions the X-ray source module on the first plane; a lifting device is used to move along a first direction (e.g., Figure 1 The first direction (Y direction, which is perpendicular to the XZ plane) is used to adjust the position of the X-ray source module, wherein the first direction is perpendicular to the first plane; and the second positioning device is used to fix the position of the X-ray source module in the first direction.

[0164] Figure 5 A specific embodiment of the mounting and positioning structure for the aforementioned radiation source module is shown. For example... Figure 5 As shown, the mounting and positioning structure includes main bodies 11 and 12, which are located at both ends of the X-ray source module along its length and are fixedly connected to the X-ray source module (here, the X-ray source module is...). Figure 2 Taking the X-ray source module 33 of the X-ray source 3 as an example, it can also be other suitable X-ray source modules. The X-ray source module 33 is fixedly installed to the support frame 5 via the main bodies 11 and 12. Figure 5(Not shown in the image). The moving device for the mounting and positioning structure is specifically configured as rollers 13 and 14, which are respectively mounted on the main bodies 11 and 12. The X-ray source module 33 can be pushed by the rollers 13 and 14, thereby moving to the predetermined installation position on the XZ plane. Of course, the moving device for the mounting and positioning structure is not limited to rollers. According to other embodiments, the X-ray source module can also be moved by sliding. For example, a linear sliding fit can be provided between the mounting and positioning structure and the support frame 5 to move the X-ray source module 33 to the predetermined installation position.

[0165] The first positioning device includes first positioning pins 15 and 16 and corresponding first pin holes (not shown in the figure) respectively set on the main body 11, 12 and the support frame 5 of the X-ray scanning equipment. After the X-ray source module 33 is moved to the predetermined installation position by the rollers 13 and 14, the first positioning pins 15 and 16 are inserted into the corresponding first pin holes respectively, so that the X-ray source module 33 can be positioned on the XZ plane.

[0166] The lifting device includes rollers 13 mounted on the main body 11, specifically designed as liftable rollers, and lifting screws 17 mounted on the main body 12. One end of the lifting screw 17 abuts against the support frame 5. Twisting the lifting screw 17 raises or lowers the main body 12 and the X-ray source module 33 relative to the support frame 5. By adjusting the liftable rollers 13 and the lifting screws 17, the position of the X-ray source module 33 relative to the support frame 5 can be adjusted along the Y direction. The second positioning device is formed as positioning pads 19 and 20. After adjusting the X-ray source module 33 to a predetermined position along the Y direction by adjusting the liftable rollers 13 and the lifting screws 17, the positioning pads 19 and 20 are placed below the main bodies 11 and 12 respectively. This fixes the height of the X-ray source module 33 relative to the support frame 5, thereby positioning the X-ray source module 33 along the first direction Y. Specifically, the positioning pad 20 below the main body 12 can be configured in a U-shape, with the lower part of the lifting screw 17 located in the opening of the U-shaped positioning pad 20 to prevent them from interfering with each other. Furthermore, the mounting positioning structure may also include first fixing bolts 21 and 22, and corresponding first threaded holes in the main bodies 11 and 12, the positioning pads 19 and 20, and the support frame 5. Inserting the first fixing bolts 21 and 22 into the corresponding first threaded holes and tightening them can fix the positioning pads 19 and 20 relative to the main bodies 11 and 12 and the support frame 5, and can also fix the X-ray source module 33 to the support frame 5.

[0167] Furthermore, according to some embodiments, the mounting and positioning structure also includes an adjustment device for rotating the X-ray source module along a predetermined axis to adjust its beam exit angle. Figure 5In a specific embodiment, the X-ray source module 33 is provided with a mounting shaft 331, and the main bodies 11 and 12 are respectively provided with shaft holes. The main bodies 11 and 12 are mounted on the mounting shaft 331 through the shaft holes. In addition, the mounting and positioning structure also includes second positioning pins 23 and 24. The main bodies 11 and 12 and the X-ray source module 33 are respectively provided with second pin holes corresponding to the second positioning pins 23 and 24. By fitting the shaft holes of the main bodies 11 and 12 onto the mounting shaft 331, and inserting the second positioning pins 23 and 24 into the corresponding second pin holes, the main bodies 11 and 12 can be positioned relative to the X-ray source module 33. Furthermore, the mounting and positioning structure also includes second fixing bolts 25 and 26 for fixing the main bodies 11 and 12 relative to the X-ray source module 33, and corresponding second threaded holes provided on the main bodies 11, 12 and the X-ray source module 33. By screwing the second fixing bolts 25 and 26 into the corresponding second threaded holes, the main bodies 11 and 12 can be fixedly connected relative to the X-ray source module 33. Pulling out the second positioning pins 23 and 24 and loosening the second fixing bolts 25 and 26 allows the main bodies 11 and 12 to be released relative to the X-ray source module 33. In this state, the adjustment device can drive the X-ray source module 33 to rotate around the mounting axis 331 relative to the main bodies 11 and 12.

[0168] In a specific embodiment, the adjustment device includes a rotation drive mechanism, which includes an adjustment block 27 fixed on the X-ray source module 33 and a set screw 28 disposed on the main body 11 that abuts against the adjustment block 27. The set screw 28 can be screwed to push the adjustment block 27 to move, thereby causing the X-ray source module 33 to rotate. Here, the rotation drive mechanism is only disposed on one main body of the mounting and positioning structure, that is, only disposed at one end of the X-ray source module 33 along the length direction. Since both ends of the X-ray source module 33 are supported by the mounting shaft 331, pushing the X-ray source module 33 to rotate at one end of the X-ray source module 33 will cause the entire X-ray source module 33 to rotate accordingly. After the X-ray source module 33 has rotated through a predetermined angle, the second positioning pins 23 and 24 are inserted again into the corresponding second pin holes, and the second fixing bolts 25 and 26 are screwed into the corresponding second threaded holes again, thereby fixing the main bodies 11 and 12 relative to the X-ray source module 33.

[0169] In the above embodiment, the mounting axis 331 on the X-ray source module 33 can coincide with the virtual connection line of multiple target points in the X-ray source module 33. Therefore, rotating the X-ray source module 33 around the mounting axis 331 can make the X-ray source module 33 rotate around the target axis.

[0170] In addition, although Figure 2 The installation and positioning structure according to the above embodiment is described using the radiation source module 33 of radiation source 3 as an example. However, the above installation and positioning structure is applicable to the installation, positioning, and adjustment of radiation sources in any suitable radiation scanning device. Of course, Figure 2The installation, positioning, and adjustment of the radiation source module 33 of the radiation source 3 are not limited to the installation and positioning structure of the above embodiment, and any other suitable structure can be used. For example, in Figure 5 In the illustrated embodiment, the lifting device is implemented using liftable rollers 13 and lifting screws 17. However, the lifting device is not limited to the specific structure of this embodiment and can be implemented with other suitable structures, such as using lifting screws on both main bodies for lifting. 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 in the above embodiments and can all adopt other suitable structures, as long as their functions can be achieved.

[0171] In the above embodiments, Figure 1 The X-ray source module of X-ray source 3 in the X-ray scanning device shown is a distributed X-ray source; however, alternatively, X-ray source 3 can also consist of multiple single-point source groups, wherein each single-point source group includes at least two single-point sources. Each single-point source can emit an individual X-ray beam, such as a fan-shaped beam with an angle A (e.g., ...). Figure 3 (As shown). Each single-point source of X-ray source 3 can emit X-rays according to a predetermined timing sequence under the control of the control device of the X-ray scanning system. Figure 4 (d) illustrates the layout of a radiation source comprising multiple single-point source groups according to some embodiments. Figure 4 As shown in (d), the X-ray source includes multiple single-point source groups arranged around the scanning area at the bottom view, left view, right view, top view, and corner oblique view. Specifically: the bottom view single-point source group includes three single-point sources arranged at the left bottom view, middle bottom view, and right bottom view; the top view single-point source group includes three single-point sources arranged at the left top view, middle top view, and right top view; the left view single-point source group includes two single-point sources arranged at the upper left side view and lower left side view; the right view single-point source group includes two single-point sources arranged at the upper right side view and lower right side view; and the corner oblique view single-point source group includes four single-point sources arranged at the upper left oblique view, upper right oblique view, lower left oblique view, and lower right oblique view. According to other embodiments, each single-point source group may also include more single-point sources. Similarly, each point source may include its own mounting and positioning structure for mounting and positioning, thereby ensuring that multiple point sources are located in the same plane perpendicular to the transport direction of the object being inspected 6. The mounting and positioning structure can also be used to rotate the point sources to adjust the beam exit angle of each point source.

[0172] Below is a detailed description. Figure 1The arrangement of detector 4 in the X-ray scanning device is shown. Detector 4 may include multiple detector groups located in a plane perpendicular to the transport direction of the object 6 being inspected, and the ends of each detector group are interconnected to surround the scanning area. The multiple detector groups may be located in the same plane or different planes perpendicular to the transport direction of the object 6 being inspected, preferably in the same plane. This embodiment describes the situation as being in the same plane, but the same applies to the case of different planes. Specifically, each detector group of detector 4 is a detector array comprising multiple detector units. The multiple detector groups can be arranged in a closed square, rectangular, polygonal, or elliptical structure surrounding the scanning area, wherein a portion of the structure is located below the transport device 1 to completely surround the transport device 1.

[0173] Figure 2 The diagram illustrates a detector arrangement according to some embodiments, wherein detector 4 comprises four detector groups 41, 42, 43, and 44, each detector group 41, 42, 43, and 44 being a linear detector array comprising multiple detector elements arranged in a straight line. The four detector groups 41, 42, 43, and 44 are arranged on the top, bottom, left, and right sides of the scanning area and are interconnected at their ends to form a closed rectangular structure (e.g., ...). Figure 6 (as shown in (a)) or a square structure. The arrangement of detector 4 is not limited to... Figure 2 and Figure 6 The embodiment shown in (a) is alternatively arranged in other configurations. For example, detector 4 may include four longer linear detector arrays and four shorter linear detector arrays, which are arranged alternately around the scanning area and connected at their ends to form a closed polygonal structure (e.g., Figure 6 (as shown in (b)). Detector 4 may include a number of longer linear detector arrays and a number of shorter linear detector arrays, which are arranged alternately around the scanning area and connected at their ends to form other closed polygonal structures. Detector 4 may also include other numbers, lengths and / or shapes of detector groups to form other closed structures, such as elliptical structures.

[0174] The detector array, in the form of a linear detector array, can adopt any suitable structure, and according to some embodiments, its specific structure can be as follows: Figure 7 As shown. Figure 7 As shown, the detector array includes multiple detector elements 45 and detector arms 46, with the detector elements 45 arranged side-by-side along a straight line on the detector arms 46. The specific structure of the detector elements 45 can be as follows: Figure 8 As shown, other suitable structures can also be used. For example... Figure 8As shown, detector unit 45 includes detector crystal 451 for receiving radiation. Multiple detector units 45 are arranged side-by-side on detector arm 46 with the detector crystal 451 facing the same direction. The structure of detector arm 46 is not limited to... Figure 7 The illustrated embodiment can also employ other suitable structures (described below). Figure 9 , Figure 15-17 (The detector arm structure shown is illustrated). The detector array in this application is not limited to the form of a linear detector array, but can also be in the form of an arc-shaped detector array to form an elliptical detector structure. The arc-shaped detector array may include multiple arc-shaped detector units and arc-shaped detector arms, with the multiple arc-shaped detector units arranged side by side on the arc-shaped detector arms, wherein the detector crystals of the detector units face the same direction.

[0175] According to some embodiments, each detector group of detector 4 is independently detachable and installable, thereby improving the maintainability of the detector. Furthermore, specifically, the multiple detector groups of detector 4 are configured to be detached, installed, and adjusted along the transport direction of the object 6 being detected. This allows the detector groups to be detached, installed, adjusted, and maintained without disassembling the radiation source when detector 4 is arranged inside the radiation source 3 along a direction perpendicular to the transport direction of the object 6, further improving the maintainability of the detector.

[0176] Specifically, with the aid of the detector assembly mounting and fixing structure of the present application, the detector assembly of the detector 4 can be moved relative to its mounting position in the X-ray scanning equipment (e.g., support frame 5) along the transport direction of the object 6 to be detected, so as to be detached from or installed at the mounting position.

[0177] The following describes in detail the mounting and fixing structure for a detector assembly according to some embodiments of this application. Specifically, the mounting and fixing structure for a detector assembly according to some embodiments of this application includes a first mounting part fixedly disposed on the detector assembly; a second mounting part fixedly disposed on the support frame of the X-ray scanning equipment and linearly movable in cooperation with the first mounting part, wherein the detector assembly can move along the second mounting part to a predetermined mounting position while the first and second mounting parts are in cooperation; and a fixing device disposed on one side of the detector assembly along its width direction for fixing the detector assembly relative to a mounting reference surface on the support frame. In some specific embodiments, the detector assembly is mounted and fixed to the support frame of the X-ray scanning equipment via a detector arm, wherein the first mounting part is fixedly disposed on the detector arm of the detector assembly, and the fixing device is disposed on one side of the detector arm along its width direction, fixing the detector arm to the support frame to fix the detector assembly.

[0178] Figure 9The mounting and fixing structure of the detector assembly according to some specific embodiments is shown, wherein Figure (a) shows an exploded perspective view of the detector arm and the mounting and fixing structure, and Figure (b) is a partial cross-sectional view of the detector arm in the mounted and fixed state of the detector assembly. Figure 9 The complete detector group is not shown; only the detector arm is shown, in which multiple detector elements can be arranged side by side along the length of the detector arm to form a complete detector group.

[0179] like Figure 9 As shown, the first mounting portion of the detector assembly's mounting and fixing structure is specifically formed as a groove 471 extending in the width direction of the detector arm 47, wherein, when mounted to the support frame 5 of the X-ray scanning equipment, the width direction of the detector arm 47 coincides with the transport direction of the object being detected 6. The second mounting portion is formed as a slide rod 472 that cooperates with the groove 471. The groove 471 is formed as a semi-circular open groove, and the slide rod 472 is correspondingly formed as a cylindrical slide rod. The slide rod 472 is fixedly mounted on the support frame 5, or integrally formed with the support frame 5, and its length direction coincides with the transport direction of the object being detected 6. The end of the slide rod 472 near the support frame 5 is made larger in size relative to the rest of the slide rod 472 to form a protrusion 473. The end face of the protrusion 473 facing the detector arm 47 is formed as a mounting reference surface 474, which abuts against the surface 475 of the detector arm 47 along its width direction. Surface 475 is the mounting surface of detector arm 475. Both it and mounting reference surface 474 are machined to have good flatness. When the mounting surface 475 of the detector assembly is positioned against the mounting reference surface 474, the detector assembly can be accurately positioned in the width direction, i.e., the conveying direction of the object 6 being detected. The protrusion 473 can also be used as a limiting part. When installing the detector assembly, 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 until the detector arm 47 abuts against the protrusion 473, thereby moving the detector arm 47 to the predetermined installation position.

[0180] A fixing device is provided at the other end of the slide rod 472 opposite to the protrusion 473, and is arranged to abut against both sides of the detector arm 471 along the width direction, thereby defining the position of the detector arm 47 in the width direction. Specifically, the fixing device includes a positioning sleeve 476 and a fastener 477. The positioning sleeve 476 is sleeved on the other end of the slide rod 472 opposite to the protrusion 473 and abuts against the surface 478 of the detector arm 47 on the other side along the width direction. The fastener 477 fixes the positioning sleeve 476 to the other end of the slide rod 472 opposite to the protrusion 473. Specifically, the fastener 477 can be a fastening screw. Both the positioning sleeve 476 and the other end of the slide rod 472 are provided with threaded holes. By screwing the fastening screw into the threaded holes, the positioning sleeve 476 is tightened relative to the slide rod 472, thereby fixing the detector arm 47 relative to the slide rod 472 (i.e., the support frame 5) in the width direction. Meanwhile, since the shape matching of the slide bar 472 and the slide groove 471 restricts other degrees of freedom, the detector arm 47 can be completely positioned and fixed.

[0181] With the aforementioned installation and fixing structure, when installing the detector assembly, with the detector unit facing the scanning area and its width direction aligned with the transport direction of the object being detected 6, first align the slide groove 471 of the detector arm 47 with the slide rod 472, and move the detector arm 47 along the slide rod 472 until it abuts against the protrusion 473; then, fit the positioning sleeve 476 onto the end of the slide rod 472 opposite to the protrusion 473, and fix it relative to the slide rod 472 with screws, thereby fixing the detector arm 47. Disassembling the detector assembly is achieved by performing the reverse operation.

[0182] With the aforementioned mounting and fixing structure, since the slide bar 472 extends along the conveying direction of the object 6 being detected, that is, the linear movement between the detector assembly and the support frame 5 is along the conveying direction of the object being detected, and the fixing device is located on one side of the detector assembly along the width direction, and the width direction of the detector assembly is consistent with the conveying direction of the object 6 being detected. Therefore, by means of the aforementioned mounting and fixing structure, the detector assembly can be moved along the conveying direction of the object 6 for installation or removal, and the fastening operation can also be performed on one side of the detector assembly along the conveying direction of the object being detected. Therefore, the detector can be installed or maintained from the side along the conveying direction of the object being detected. Even when the detector is arranged inside the radiation source perpendicular to the conveying direction, its installation or maintenance can avoid the obstruction of the radiation source and can be performed without removing the radiation source, thereby improving the convenience of detector installation and maintenance.

[0183] Furthermore, preferably, the second mounting portion of the aforementioned mounting and fixing structure is configured to support the detector assembly at a predetermined mounting position when cooperating with the first mounting portion. Specifically, the second mounting portion includes two sliding rods 472, and correspondingly, two sliding grooves 471 are formed on the detector arm 47, which are disposed at both ends of the detector arm 47 along its length. This allows the detector arm 47 to be supported at the predetermined mounting position by the two sliding rods 472 after it has moved along the two sliding rods 472, without the need for other auxiliary structures and / or tools. Thus, when fastening the detector assembly, no additional tools or operator support are required, thereby improving operational convenience.

[0184] Although Figure 9 The detector arm is shown in a vertical direction, but the above-described mounting and fixing structure is not limited to the installation and removal of detector groups arranged vertically in X-ray scanning equipment. Detector groups arranged in other directions can also use the above-described mounting and fixing structure.

[0185] Of course, the mounting and fixing structure between the detector assembly and the support frame 5 is not limited to... Figure 9 The embodiments shown can also employ other suitable mounting and fixing structures. For example, according to some embodiments, the linear movement fit of the mounting and fixing structure can be other suitable fits, such as linear rolling fits such as the fit between a linear ball bearing and a cylindrical shaft. According to other embodiments, the cross-section of the slide groove 471 is not limited to a semi-circle, but can be a semi-rectangular shape or the like. Correspondingly, the slide rod 472 is not limited to a cylinder, but can also be a prism shape or the like that that mates with the slide groove 471.

[0186] Furthermore, when the detector comprises multiple detector groups, setting the mounting reference planes of each of the multiple detector groups in the same plane perpendicular to the transport direction of the object being detected 6 ensures that the multiple detector groups are in the same plane perpendicular to the transport direction of the object being detected 6 after installation. Specifically, if each detector group uses such... Figure 9 The mounting and fixing structure shown is used for installation, so that the end face of the corresponding protrusion 473 of each detector group facing the detector arm 47, that is, the mounting reference surface 474, is in the same plane perpendicular to the conveying direction of the object being detected 6, and the mounting surface 475 of each detector group along the width direction is fixed against its respective mounting reference surface 474. After the multiple detector groups are installed in place, they will necessarily be located in the same plane perpendicular to the conveying direction of the object being detected 6.

[0187] The relative arrangement of the X-ray source 3 and detector 4 of the X-ray scanning device according to an embodiment of this application is further described below. As previously described, the X-ray source 3 includes multiple X-ray source modules, each arranged around the scanning area and located in the same plane perpendicular to the transport direction of the object being inspected 6; the detector 4 includes multiple detector groups, each located in the same plane perpendicular to the transport direction of the object being inspected 6, and the ends of each detector group are interconnected to be arranged around the scanning area. Further, in the combined state of the X-ray source 3 and detector 4, the detector 4 is arranged inside the X-ray source 3 in the direction perpendicular to the transport direction of the object being inspected 6, and the X-ray source 3 and detector 4 are arranged to at least partially overlap in the transport direction of the object being inspected 6, wherein the multiple X-ray source modules of the X-ray source 3 can be arranged in a rectangular structure, a polygonal structure, an elliptical structure, or any structure as described in any of the embodiments above, and the multiple detector groups of the detector 4 can be arranged in a square structure, a rectangular structure, a polygonal structure, an elliptical structure, or any structure as described in any of the embodiments above. Figure 2 The illustrated embodiment serves as an example to describe the detailed arrangement of the X-ray source 3 and detector 4 in their combined state. Figure 2 In the structure, the four linear distributed radiation source modules 31, 32, 33, and 34 of radiation source 3 are arranged in a discontinuous rectangular structure, while the four linear detector arrays 41, 42, 43, and 44 of detector 4 are arranged in a closed rectangular structure. Figure 2 The detailed arrangement of the combination state described in the example is also applicable to any other combination of the X-ray source 3 and the detector 4.

[0188] Preferably, the detector groups 41, 42, 43, and 44 of detector 4 are arranged so as not to block the radiation beams of the radiation source modules on the same side, while being able to receive radiation from the radiation source modules on the other sides. Since both radiation source 3 and detector 4 are arranged in a ring, the same detector group can be shared by different radiation source modules of the radiation source. Figure 10 The diagram illustrates the correspondence between each radiation source module and the detector group that receives its radiation. Specifically, the radiation beams from each target point of radiation source modules 31, 32, 33, and 34 of radiation source 3 are arranged in a fan-shaped beam (e.g., ...). Figure 3 Taking the example of a ray beam with an angle A, the ray beams emitted by each ray source module 31, 32, 33, and 34 can be detected by the three-sided detector group of detector 4. The detector group that can receive the ray and its part are represented by thick solid lines. Figure 10 (a) shows the detector group and part thereof corresponding to the X-ray beam of the X-ray source module 31 above the scanning area, wherein detector groups 42, 43, and 44 of detector 4 receive the X-ray beam from the X-ray source module 31. Figure 10(b) shows the detector group and part thereof corresponding to the X-ray beam of the X-ray source module 32 on the right side of the scanning area, wherein detector groups 41, 43, and 44 of detector 4 receive the X-ray beam from the X-ray source module 32. Figure 10 (c) shows the detector group and part thereof corresponding to the X-ray beam of the X-ray source module 33 on the lower side of the scanning area, wherein the detector groups 41, 42, and 44 of the detector 4 receive the X-ray beam from the X-ray source module 33. Figure 10 (d) shows the detector group and its portion corresponding to the X-ray beam of the X-ray source module 34 on the left side of the scanning area, wherein detector groups 41, 42, and 43 of detector 4 receive the X-ray beam from the X-ray source module 34. Figure 10 As can be seen, the radiation from one radiation source module can be received by detector groups on other sides besides the same-side detector group. Different radiation source modules can 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, and radiation source modules 33 and 34 share detector groups 41 and 42, etc. Furthermore, the radiation from each radiation source module can be detected not only by the detector group on the opposite side but also by detector groups on other sides besides the same-side detector group. Therefore, the radiation from each radiation source module can be detected by as many detectors as possible. Thus, the detector of this application can improve image quality while reducing the number of detector groups and lowering equipment costs.

[0189] Furthermore, preferably, the detector crystals of each detector group of detector 4 are arranged at the end of the detector unit along the transport direction of the object 6 being detected, and are arranged to be adjacent to the edge of the X-ray beam of the X-ray source module on the same side in the transport direction of the object 6 being detected, but without obstructing the X-ray beam of the X-ray source module on the same side. This minimizes the coverage length of the optical path between the X-ray source and the detector, thereby reducing the overall equipment length. Specifically, as shown in 11 and... Figure 12 As shown. Figure 11 According to some embodiments Figure 1 The diagram shows a cross-sectional view of the X-ray scanning device along the centerline of the transport direction of the object being inspected. Figure 11 As shown, the detector unit can be, for example, Figure 7 The detector unit 45 shown may have a detector crystal, for example, that is... Figure 7 The detector crystal 451 shown is arranged with its surface parallel to the transport direction of the object 6 being detected, and is located at the end of the detector unit 45 along the transport direction of the object 6 being detected. Meanwhile, other components of the detector assembly, such as other elements of the detector unit 45 and the detector arm, are flush with the detector crystal 451 at the end of the detector unit 45, all avoiding the beam exit of the radiation source on the same side. Furthermore, Figure 12A top view schematic diagram of the detector and radiation source layout according to some embodiments is shown. The radiation source modules on the left and right sides of the diagram are radiation source modules 34 and 32 of radiation source 3, respectively. The detector crystals 451-4 and 451-2 on the left and right sides represent the positions of the detector crystals in detector groups 44 and 42, respectively. Figure 12 As can be seen, detector crystal 451-4 is positioned adjacent to the edge of the X-ray beam of the same-side X-ray source module 34 in the transport direction of the object being detected 6, without obstructing the X-ray beam of the same-side X-ray source module 34; detector crystal 451-2 is positioned adjacent to the edge of the X-ray beam of the same-side X-ray source module 32 in the transport direction of the object being detected 6, without obstructing the X-ray beam of the same-side X-ray source module 32. With the above configuration, the X-ray source 3 and detector 4 can overlap to the maximum extent in the transport direction of the object being detected 6, thereby minimizing the coverage length of the optical path between the X-ray source and the detector, and thus reducing the length of the equipment.

[0190] More specifically, the various radiation source modules of radiation source 3 are arranged such 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. For example... Figure 12 As shown, the X-ray beam from X-ray source module 34 can cover and irradiate the detector crystal 451-2 of the detector group 42 on the opposite side while avoiding the detector group 44 on the same side. Similarly, the X-ray beam from X-ray source module 32 can cover and irradiate the detector crystal 451-4 of the detector group 44 on the opposite side while avoiding the detector group 42 on the same side. Furthermore, each X-ray source module of X-ray source 3 is arranged to irradiate the detector crystal of the detector group on the opposite side with the center position of the X-ray beam. Specifically, the X-ray source module can rotate a predetermined angle relative to the target axis to adjust the exit angle of the X-ray beam of the X-ray source module, thereby irradiating the detector crystal with the center position of the X-ray beam. Here, the target axis refers to the virtual line connecting multiple target points within the X-ray source module. Since the detector crystal of the detector is located at the end of the detector unit and adjacent to the edge of the X-ray beam of the same side X-ray source in the transport direction of the object being detected 6, the X-ray source module can rotate only a very small predetermined angle, for example, 1.5 degrees, to irradiate the detector crystal with the center position of the X-ray beam. This minimizes the adverse effects of the X-ray beam obliquely entering the surface of the detector crystal on imaging. Furthermore, the rotation of the X-ray source module is not limited to rotation around the target axis; it can also rotate relative to other axes to adjust the beam exit angle. This rotation of the X-ray source relative to the target axis or other axes can be achieved through the mounting and positioning structure of the X-ray source module described above. Moreover, the method of adjusting the beam exit angle is not limited to the above embodiments; other methods can also be used, such as changing the opening direction of the X-ray source module, adjusting the collimator, and other suitable methods, as long as the above-described arrangement of the X-ray source can be achieved.

[0191] In the X-ray scanning device of this application embodiment, the X-ray source consists of multiple X-ray source modules, with their ends directly connected or spaced apart. When the ends of the X-ray source modules are directly connected, the X-ray source points between adjacent modules are inevitably discontinuous due to the mechanical connection structure. For example, the distance between target points at the ends of two adjacent X-ray source modules is significantly greater than the distance between target points within the X-ray source modules; this is even more pronounced when the ends of the X-ray source modules are spaced apart. Therefore, during scanning, adjacent X-ray source modules lack projection data due to the absence of target points. To address this, according to some embodiments, the image processing module of the X-ray scanning device of this application is configured to have a data compensation function, capable of compensating for missing viewpoint data and / or repairing reconstructed images to improve image quality. Specifically, the image processing module is configured to perform image reconstruction using an iterative method, an image threshold repair method, or a combination of both.

[0192] The iterative method specifically includes the following steps:

[0193] Step 1: Reconstruct the image using the missing viewpoint data. This missing viewpoint data refers to the initial data measured by the detector, which lacks projection data of the viewpoint without a target. For example, when the X-ray scanning device uses... Figure 2 or Figure 4 When the X-ray source with the discontinuous rectangular structure shown in (a) is used, the initial data measured by the detector is missing the projection data at the four corners of the rectangular structure at oblique angles.

[0194] Step 2: Perform forward reprojection on the reconstructed image obtained in Step 1 according to the complete geometry. Here, the reconstructed image obtained in Step 1 may present an object with incomplete geometric structure because it uses missing view data. Forward reprojection according to the complete geometry means performing forward reprojection when the geometric shape is complete. Specifically, the geometric shape can be completed by speculation, assumption, etc.

[0195] Step 3: Using the reprojection data obtained in Step 2 as a reference, an image inpainting algorithm is used to repair the missing viewpoint data in the projection domain, and the repaired data is used to reconstruct the image again.

[0196] Step 4: Iterate through the aforementioned forward reprojection step, viewpoint missing data repair step, and image reconstruction step several times, and use the image obtained in the last image reconstruction step as the final reconstructed image.

[0197] In the above iterative method, a convergence threshold can be preset. When the image obtained in the image reconstruction step meets the set convergence threshold, the iteration stops and the image is used as the final reconstructed image. When the image obtained in the image reconstruction step does not meet the set convergence threshold, the next iteration continues, that is, the forward reprojection step, the viewpoint missing data repair step, and the image reconstruction step, until the image obtained in the image reconstruction step meets the set convergence threshold.

[0198] In the above iterative method, the image inpainting algorithm in step 2 includes various traditional algorithms, such as methods based on TV regularization, wavelet analysis, dictionary learning, and artificial neural network methods.

[0199] Among the iterative methods described above, image reconstruction methods include commonly used algorithms such as analytical algorithms and iterative algorithms.

[0200] According to other embodiments, the image processing module can also use an image thresholding inpainting method to obtain the reconstructed image. Specifically, the image processing module can use viewpoint missing data, i.e., the initial data measured by the detector, to perform image reconstruction, and then use an image inpainting algorithm at the image threshold to perform artifact removal and data correction processing on the reconstructed image to obtain the final reconstructed image. In this embodiment, the image inpainting algorithm includes various traditional algorithms, such as methods based on TV regularization, wavelet analysis, dictionary learning, etc., as well as artificial neural network methods.

[0201] According to other embodiments, the image processing module can use a combination of the above-described iterative method and the above-described image threshold inpainting method to perform image reconstruction in order to improve image quality. Specifically, the image processing module can first use the above-described iterative method to complete the missing data in the projection domain and obtain a reconstructed image that meets the set convergence threshold. Then, the above-described image threshold inpainting method is used to perform artifact removal and data correction processing on the reconstructed image obtained by the above-described iterative method at the image threshold, and the final reconstructed image is obtained.

[0202] Compared to X-ray sources using distributed multi-point sources, X-ray sources using single-point sources have relatively sparse source points, and the image processing module can use image reconstruction algorithms suitable for sparse viewpoint data to obtain scanned images.

[0203] In the X-ray scanning device of the foregoing embodiments, the X-ray source surrounds the scanning area on all four sides (top, bottom, left, and right). According to other embodiments, this application also provides a X-ray scanning device with an arrangement basically the same as the X-ray scanning device of the foregoing embodiments, the main difference being the arrangement of the X-ray source, wherein the X-ray source surrounds the scanning area only on one of the top, bottom, and left / right sides. The following description uses the arrangement of the X-ray source on the top, bottom, and right side of the scanning area as examples, but it is equally applicable to the case where the X-ray source is arranged on the top, bottom, and left side of the scanning area.

[0204] Specifically, in the X-ray scanning device of the aforementioned embodiment, each X-ray source module of the X-ray source 3 is a distributed multi-point source, and the multiple X-ray source modules can be arranged in a rectangular structure, polygonal structure, elliptical structure, etc., surrounding the scanning area. In this embodiment, the multiple X-ray source modules can still be distributed multi-point sources, but the difference is that the multiple X-ray source modules are arranged in a non-closed structure with an opening on the left side of the scanning area, such as a rectangular structure, polygonal structure, elliptical structure, etc., with an opening on the left side. Here, the left side of the scanning area refers to the left side of the scanning area in the direction perpendicular to the transport direction of the object 6 being detected. In the aforementioned embodiment, the X-ray source 3 is arranged in a non-continuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a non-continuous polygonal or non-continuous rounded rectangle structure, and other polygonal and elliptical structures. Correspondingly, in this embodiment, the X-ray source is arranged in a non-continuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a non-continuous polygonal or rounded rectangle structure, and other polygonal and elliptical structures with an opening on the left side of the scanning area, for example, relative to Figure 2 The radiation source, in this embodiment, at least does not include the radiation source module 34 on the left side of the scanning area; for example, relative to... Figure 4 (b)- Figure 4 The radiation source shown in (c) in this embodiment does not include the radiation source module on the left side of the object being detected 6.

[0205] In addition, similar to the previous embodiments, the X-ray source in this embodiment can also be composed of multiple single-point source groups. The only difference from the previous embodiments is that the X-ray source 3 in this embodiment does not include the single-point source at the left-side viewpoint, or does not include the single-point sources at the left-side viewpoint, the upper left oblique viewpoint, and the lower left oblique viewpoint.

[0206] Apart from the differences mentioned above, all other features of the radiation source in this embodiment are the same as those of radiation source 3 in the aforementioned embodiment.

[0207] The detector in this embodiment is essentially the same as the detector 4 in the aforementioned embodiment, except that in this embodiment, the detector is combined with a radiation source that surrounds the scanning area only on the upper, lower, and right sides. The detector group on the left side of the scanning area of ​​detector 4 does not have a radiation source module on the same side. Therefore, in addition to using the same method as in the aforementioned embodiment, the disassembly and installation of each detector group of detector 4 can also be carried out in a different manner as described below to further facilitate the disassembly, assembly, and maintenance of the detector. Specifically, with... Figure 13 The combination of the detector group and the radiation source shown is an example (where the detector group and the radiation source are combined). Figure 2 The detector group shown is the same, and the radiation source is the same as... Figure 2 Compared to the X-ray source shown, which lacks the X-ray source module on the left side of the scanning area, detector 4 can be disassembled and installed in the following manner: detector groups 41', 43', and 44' are perpendicular to the transport direction of the object 6 being detected (e.g., ...). Figure 14 As shown, along the X direction) the detector assembly 42' is disassembled or installed relative to the support frame 5, and along the transport direction of the object 6 being detected (e.g., along the X direction). Figure 14 As shown, it can be disassembled or installed relative to the support frame 5 along the Z direction.

[0208] Detector group 42' can adopt the same mounting and fixing structure as in the aforementioned embodiments (e.g. Figure 9 (As shown) to be disassembled or installed relative to the support frame 5. However, the mounting and fixing structure of the aforementioned embodiment is not suitable for disassembly or installation of the detector groups 41', 43', and 44' along the X direction, therefore different mounting and fixing structures are required. Specific embodiments of these mounting and fixing structures will be described in detail below.

[0209] Similar to the mounting and fixing structure of the aforementioned embodiments, the mounting and fixing structure suitable for the X-direction assembly and disassembly of detector groups 41', 43', and 44' also specifically includes a first mounting part, which is fixedly mounted on the detector group; a second mounting part, which is fixedly mounted on the support frame of the X-ray scanning equipment and linearly movable in cooperation with the first mounting part, wherein the detector group can move along the second mounting part to a predetermined mounting position when the first mounting part and the second mounting part are in cooperation; and a fixing device, which is disposed on one side of the detector group along the width direction for fixing the detector group relative to the mounting reference surface on the support frame. In some specific embodiments, detector groups 41', 43', and 44' are mounted and fixed to the support frame of the X-ray scanning equipment via detector arms, wherein the first mounting part is fixedly mounted on the detector arm, and the fixing device is disposed on one side of the detector arm along the width direction, which fixes the detector arm to the support frame to fix the detector group.

[0210] Figure 15A mounting and fixing structure suitable for detector assembly 41' according to some specific embodiments is shown, wherein Figure (a) shows a perspective view of the detector assembly in the mounted state, Figure (b) is a side view of the detector assembly in the mounted state, Figure (c) is a perspective view of the detector assembly in the dismounted state, and Figure (d) is a cross-sectional view of the detector assembly with fixing devices in the mounted state. Figure 15 As shown, the first mounting part of the mounting and fixing structure of the detector assembly 41' includes a slider 412 disposed on the detector arm 411. The slider 412 extends along the length direction of the detector arm 411, wherein, when the detector assembly 41' is installed in the X-ray scanning equipment, the length direction of the detector arm 411 is perpendicular to the transport direction of the object being detected 6. Figure 15 In this embodiment, the slider 412 extends beyond a portion of the length of the detector arm 411. In other embodiments, the slider 412 may also extend beyond the entire length or other lengths of the detector arm 411. Furthermore, the slider 412 can be fixed to the detector arm 411 by bolts or the like. According to other embodiments, the slider 412 may also be integrally formed with the detector arm 411.

[0211] The second mounting section is formed as a fixed guide rail 413 that mates with the slider 412. The fixed guide rail 413 is fixedly connected to the support frame 5 of the X-ray scanning equipment. Figure 15 (Not shown in the figure) It can also be integrally formed with the support frame 5. The length direction of the fixed guide rail 413 is perpendicular to the transport direction of the object 6 being inspected by the X-ray scanning equipment. A limit part (not shown in the figure) can be provided at one end of the fixed guide rail 413 along the length direction. When installing the detector assembly 41', the slider 412 is aligned with the fixed guide rail 413, and the detector assembly 41' is pushed along the fixed guide rail 413 until the detector arm 411 abuts against the limit part, thereby moving the detector assembly 41' to the predetermined installation position.

[0212] A fixing device is disposed on one side of the detector assembly 41' along the width direction and abuts against the surface 414 of the detector arm 411 along 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 its end face away from the support frame 5 is formed as a mounting reference surface 417, which abuts against the surface 414 of the detector arm 411 along the width direction. The surface 414 is the mounting surface of the detector arm 411, and both it and the mounting reference surface 417 are machined to have good flatness, so that when the mounting surface 414 of the detector arm 411 is fixed against the mounting reference surface 417, the detector assembly 41' can be accurately positioned in the width direction. The fastener 416 can pass through the positioning member 415 and fastens the detector assembly 41' relative to the end face of the positioning member 415. Specifically, the fastener 416 may be, for example, a fastening bolt. The positioning member 415 and the detector arm 411 have corresponding threaded holes on their sides opposite to the positioning member 415. By passing the fastening bolt 416 through the corresponding threaded holes and tightening it, the detector assembly 41' can be secured relative to the end face of the positioning member 415. Multiple fixing devices may be provided along the length of the detector assembly 41', for example, at least two, to securely fix the detector assembly 41' to the support frame 5.

[0213] With the detector unit facing down, the detector group 41' is installed using the aforementioned mounting structure. First, the slider 412 on the detector group 41' is aligned with the fixed guide rail 413, allowing the detector group 41' to move along the fixed guide rail 413 until it abuts against the limiting portion. Then, the fastening bolt 416 is passed through the corresponding threaded holes on the positioning member 415 and the detector arm 411 and tightened, thereby positioning the detector group 41' relative to the end face of the positioning member 415, i.e., the mounting reference surface 417. Disassembling the detector group 41' is achieved by performing the reverse operation.

[0214] Since the length direction of the fixed guide rail is perpendicular to the transport direction of the object 6 being inspected by the X-ray scanning equipment, and there is no X-ray source obstruction on the X-axis side of the detector group 41', the detector group 41' can be disassembled or installed relative to the support frame 5 perpendicular to the transport direction of the object 6 being inspected by the aforementioned mounting and fixing structure. Furthermore, the fixing device is located on the width side of the detector group, i.e., the Z-axis side of the detector, thus avoiding obstruction from the X-ray source to secure the detector group, facilitating disassembly, assembly, and maintenance of the detector group.

[0215] Furthermore, preferably, in the above-described mounting and fixing structure, the second mounting portion is configured to support the detector assembly 41' in a predetermined mounting position when it cooperates with the first mounting portion. Specifically, the slider 412 is provided on both sides of the detector arm 411 in the width direction and has inner extensions 4121, 4122 extending inward from the edges of the two sides of the detector arm 411 in the width direction (see...). Figure 15 Figure (b)); the fixed guide rail 413 includes outwardly extending extensions 4131, 4132 on opposite sides along the width direction (see Figure 4131). Figure 15 (See Figure (b)); and, with the slider 412 engaged with the fixed guide rail 413, the inner extensions 4121 and 4122 of the slider 412 are located above the outer extensions 4131 and 4132 of the fixed guide rail 413, and the two are in contact and overlapped. Thus, after the detector assembly 41' moves along the fixed guide rail 413 to the predetermined installation position, the detector assembly 41' can be suspended on the outer extensions 4131 and 4132 of the fixed guide rail 413 via the inner extensions 4121 and 4122 of the slider 412. In this way, the fixed guide rail 413 can support the detector assembly 41' at the predetermined installation position without the need for other additional auxiliary structures or tools. When fastening the detector assembly 41', the operator does not need to support the detector assembly 41', thereby improving operational convenience.

[0216] Detector group 43', similar to detector group 41', uses a combination of slider and fixed guide rail for assembly and disassembly. Specifically, Figure 16 A mounting and fixing structure suitable for detector assembly 43' according to some specific embodiments is shown, wherein Figure (a) shows a perspective view of the detector assembly in the mounted state and Figure (b) is a side view of the detector assembly in the mounted state.

[0217] like Figure 16 As shown, the first mounting part of the mounting and fixing structure of the detector assembly 43' includes a slider 432 disposed on the detector arm 431. The slider 432 extends along the length direction of the detector arm 431, wherein, when the detector assembly 43' is installed in the X-ray scanning equipment, the length direction of the detector arm 431 is perpendicular to the transport direction of the object 6 being inspected by the X-ray scanning equipment. The slider 432 can be fixed to the detector arm 431 by bolts or the like, or it can be integrally formed with the detector arm 431. The detector arm 431 has a groove 433 extending along its length direction, and the slider 432 is disposed in the groove 433.

[0218] The second mounting section is formed as a fixed guide rail 434 that cooperates with the slider 432. The fixed guide rail 434 is fixedly connected to the support frame 5 of the X-ray scanning equipment, or it can be integrally formed with the support frame 5. The length direction of the fixed guide rail 434 is perpendicular to the transport direction of the object 6 being inspected. A limit part (not shown in the figure) can be provided at one end of the fixed guide rail 434 along its length direction. When installing the detector assembly 43', the slider 432 is aligned with the fixed guide rail 434, and the detector assembly 43' is pushed along the fixed guide rail 434 until the detector arm 431 abuts against the limit part, thereby moving the detector assembly 43' to the predetermined installation position.

[0219] The mounting and fixing device for detector assembly 43' is the same as that for detector assembly 41', and its specific structure will not be described in detail here. Using this device, detector assembly 43' can be securely fixed against the corresponding mounting reference surface on the support frame 5. Detector arm 431 of detector assembly 43' also has a mounting surface on one side along its width direction. Similarly, both this mounting surface and the mounting reference surface on the support frame 5 are machined to have good flatness, so that when the mounting surface of detector arm 431 abuts against the mounting reference surface, detector assembly 43' can be accurately positioned in the width direction. Likewise, multiple fixing devices can be provided along the length direction of detector assembly 43', for example, at least two, to firmly fix detector assembly 43' to the support frame 5.

[0220] With the detector unit facing upwards, the detector assembly 43' is installed using the aforementioned mounting structure. First, the slider 432 on the detector assembly 43' is aligned with the fixed guide rail 434, allowing the detector assembly 43' to move along the fixed guide rail 434 until it abuts against the limiting portion on the fixed guide rail 434. Then, the fastening bolts are passed through the corresponding threaded holes on the positioning component and the detector arm and tightened, thereby positioning the detector assembly 43' relative to the mounting reference surface on the positioning component. Disassembling the detector assembly 43' involves the reverse operation.

[0221] Since the length direction of the fixed guide rail is perpendicular to the transport direction of the object 6 being inspected by the X-ray scanning equipment, and there is no X-ray source obstruction on the X-axis side of the detector group 43', the detector group 43' can be disassembled or installed relative to the support frame 5 perpendicular to the transport direction of the object 6 being inspected by the aforementioned mounting and fixing structure. Furthermore, the fixing device is located on the width side of the detector group 43', i.e., the Z-axis side of the detector, thus avoiding obstruction from the X-ray source and facilitating the disassembly, assembly, and maintenance of the detector group.

[0222] Furthermore, preferably, in the above-described mounting and fixing structure, the second mounting part is configured to support the detector assembly 43' at a predetermined mounting position when it cooperates with the first mounting part. Specifically, as shown in the figure... Figure 16 As shown, the fixed guide rail 434 includes support portions 4341 and 4342. Besides slidingly engaging with the slider 432, these support portions 4341 and 4342 also support the slider 432 from below. This allows the detector assembly 43' to be supported from below after it moves along the fixed guide rail 434 to the predetermined installation position. Thus, when fastening the detector assembly 43', no additional tools or operator support are required, improving operational convenience.

[0223] Figure 17 A mounting and fixing structure suitable for detector assembly 44' according to some specific embodiments is shown, wherein Figure (a) shows a perspective view of the detector assembly in the mounted state, Figure (b) is a schematic diagram of the first mounting part and the second mounting part of the mounting and fixing structure in the separated state, and Figures (c) and (d) are perspective views from different angles of the first mounting part and the second mounting part of the mounting and fixing structure in the engaged state.

[0224] The first mounting part of the detector assembly 44' is specifically formed as a fixing block 442 disposed on one side of the detector arm 441 along the width direction. The fixing block 442 has an opening 443 facing the side of the detector arm 441 along the thickness direction. In the installed state of the detector assembly 44', the width direction of the detector arm 441 is aligned with the transport direction of the object 6 being inspected by the X-ray scanning equipment, and the thickness direction is perpendicular to the transport direction of the object 6 being inspected. The opening 443 of the fixing block 442 can be U-shaped or other suitable shapes. The fixing block 442 can be fixedly connected to the detector arm 441 by means of bolts or other methods, or it can be integrally formed with the detector arm 441.

[0225] The second mounting portion is formed as a cantilever portion 444 fixed to the support frame 5. An extension portion 445 is provided at the end of the cantilever portion 444 away from the support frame 5. This extension portion 445 linearly engages with an opening 443 on the fixing block 442, meaning the extension portion 445 can move linearly from the edge of the opening 443 to the interior of the opening 443. The length direction of the cantilever portion 444 is aligned with the transport direction of the object 6 being inspected by the X-ray scanning equipment. The bottom of the opening 443 can be used as a limiting portion. When installing the detector assembly 44', the opening 443 of the fixing block 442 on the detector arm 441 is aligned with the extension portion 445, and the detector arm 441 is moved linearly relative to the extension portion 445 until the bottom of the opening 443 abuts against the extension portion 445, thereby limiting the detector assembly 44' to a predetermined mounting position.

[0226] A fixing device is disposed on one side of the detector arm 441 along the width direction (on the same side as the fixing block 442). The end face of the fixing device is formed as a mounting reference surface, and the fixing device fastens the detector arm 441 relative to the mounting reference surface. Specifically, the fixing device may include a fixing member 446 and a fastener 447. The end face of the fixing member 446 away from the support frame 5 is formed as a mounting reference surface 448, which is used to abut against the surface 449 of the detector arm 441 along the width direction. Surface 449 is the mounting surface of the detector arm 441, and both it and the mounting reference surface 448 are machined to have good flatness. When the mounting surface 449 of the detector arm 441 is fixed against the mounting reference surface 448, the detector assembly 44' can be accurately positioned in the width direction. The fastener 447 is used to fasten the detector arm 441 relative to the end face 448 of the fixing member 446. Fastener 447 can be a fixing bolt. The side of detector arm 441 opposite to the fixing member 446 along its width direction and the fixing member 446 have corresponding threaded holes. The fixing bolt 447 can pass through the corresponding threaded holes on the fixing member 446 and detector arm 441 and be tightened to secure detector assembly 44' relative to mounting reference surface 448. Furthermore, multiple fixing devices can be included, for example, at least two. These multiple fixing devices can be spaced apart along the length direction of detector assembly 41' to securely fix and position detector assembly 44'.

[0227] With the aforementioned mounting and fixing structure, when installing the detector assembly 44', with the detector unit facing the scanning area and its width direction aligned with the transport direction of the object being detected 6, first align the opening 443 of the fixing block 442 on the detector assembly 44' with the extension 445 of the cantilever 444, and move the detector assembly 44' along the extension 445 until the bottom of the opening 443 abuts against the extension 445; then, pass the fastener 447 through the corresponding threaded holes on the fixing member 446 and the detector arm 441 and tighten it, thereby positioning the detector assembly 44' relative to the mounting reference surface 448 of the fixing member 446. The reverse operation is performed when disassembling the detector assembly 44'.

[0228] Therefore, by utilizing the above-described mounting and fixing structure, since the cantilever 444 extends along the transport direction of the object 6 being inspected in the X-ray scanning equipment, the width direction of the detector group 44' is parallel to the transport direction of the object 6 being inspected, and the opening 443 of the fixing block 442 faces the side of the thickness direction of the detector group 44', the detector group 44' can be installed or removed along the transport direction perpendicular to the object 6 being inspected by making the detector crystal face the scanning area.

[0229] Furthermore, preferably, in the above-described mounting and fixing structure, the second mounting part is configured to support the detector assembly 44' at a predetermined mounting position when cooperating with the first mounting part. That is, after the cantilever part 444 moves the detector assembly 44' relative to the extension 445 of the cantilever part 444 to the predetermined mounting position, the entire detector assembly 44' can be supported by the fixing block 442 without the need for other auxiliary structures or tools. In this way, when fastening the detector assembly 44', no additional tools or operator support is required, thereby improving operational convenience.

[0230] Although the detector groups 41', 42', 43', and 44' are disassembled or installed relative to the support frame 5 using different fixed installation structures, each detector group can still be located in the same plane perpendicular to the conveying direction of the object being detected 6 after installation. Specifically, setting the mounting reference plane of each detector group in the same plane perpendicular to the conveying direction of the object being detected 6 ensures that each detector group 41', 42', 43', and 44' is located in the same plane perpendicular to the conveying direction of the object being detected 6 after installation.

[0231] also, Figure 15-16 The linear movement between the first mounting part and the second mounting part of the fixed mounting structure is achieved by a slider guide rail. According to other embodiments, the fixed mounting structure of this application may also adopt other linear movement cooperation, such as linear sliding or linear rolling cooperation, such as linear ball bearing and cylindrical shaft cooperation.

[0232] The mounting and fixing structure of the detector group of detector 4 in the X-ray scanning device of this embodiment has been described above. Other features of the X-ray scanning device of this embodiment will now be described.

[0233] The relative arrangement of the X-ray source 3 and detector 4 in the X-ray scanning device of this embodiment is basically the same as that in the previous embodiment. Similar to the previous embodiments, the X-ray source 3 includes multiple X-ray source modules, each arranged around the scanning area and located in a plane perpendicular to the transport direction of the object 6 being detected, particularly in the same plane; the detector 4 includes multiple detector groups, each located in another plane perpendicular to the transport direction of the object 6 being detected, particularly in the same plane, and the ends of each detector group are connected to each other to be arranged around the scanning area. Furthermore, in the combined state of the X-ray source 3 and the detector 4, the detector 4 is arranged inside the X-ray source 3 in a direction perpendicular to the transport direction of the object 6 being detected, and the X-ray source 3 and the detector 4 are arranged to at least partially overlap in the transport direction of the object 6 being detected. The multiple detector groups of the detector 4 can be any of the closed square, rectangular, polygonal, or elliptical structures surrounding the scanning area as described in the previous embodiments. Unlike the previous embodiments, the multiple X-ray source modules of the X-ray source 3 are arranged as a non-closed structure with an opening on the left side of the scanning area, such as a rectangular, polygonal, or elliptical structure with an opening on the left side, as described above in this embodiment.

[0234] Similar to the previous embodiments, in this embodiment, the detector groups of detector 4 are preferably arranged so as not to obstruct the X-ray beams of the X-ray source modules on the same side, while being able to receive X-rays from the X-ray source modules on the other sides. Since both the X-ray source 3 and detector 4 are arranged in a ring shape (where the X-ray source 3 is a semi-closed ring with an opening on the left), the same detector group can be shared by different X-ray source modules of the X-ray source. In addition, the X-rays from each X-ray source module of the X-ray source 3 can be detected not only by the detector groups on the opposite side, but also by the detector groups on other sides. Therefore, the X-rays from each X-ray source module can be detected by the detectors as much as possible. Thus, the detector in this embodiment can also improve image quality while reducing the number of detector groups and lowering equipment costs.

[0235] Furthermore, similar to the aforementioned embodiments, preferably, the detector crystals of each detector group of detector 4 are arranged at the end of the detector unit along the transport direction of the object being detected 6, and are arranged to be adjacent to the edge of the X-ray beam of the X-ray source module on the same side in the transport direction of the object being detected 6, but without obstructing the X-ray beam of the X-ray source module on the same side. This minimizes the coverage length of the optical path between the X-ray source and the detector, thereby reducing the overall equipment length.

[0236] Furthermore, similar to the aforementioned embodiments, more preferably, each of the X-ray source modules of the X-ray source 3 is arranged such that the X-ray beam avoids the detector group on the same side and irradiates the detector crystal of the detector group on the opposite side. Specifically, similar to the aforementioned embodiments, the X-ray source module can rotate relative to the target axis by a predetermined angle to adjust the exit angle of the X-ray beam of the X-ray source module, thereby irradiating the detector crystal at the center position of the X-ray beam. Since the detector crystal of the detector is located at the end of the detector unit and adjacent to the edge of the X-ray beam of the X-ray source on the same side in the transport direction of the object being detected 6, the X-ray source module can rotate only a very small predetermined angle, for example, 1.5 degrees, to irradiate the detector crystal at the center position of the X-ray beam. In this way, the adverse effects of the X-ray beam obliquely entering the surface of the detector crystal on imaging can be minimized. Similar to the aforementioned embodiments, the X-ray source module can rotate about the target axis or other axes, or adjust the exit angle of the X-ray beam by other suitable methods mentioned in the aforementioned embodiments.

[0237] Furthermore, similar to the aforementioned embodiments, the ends of adjacent X-ray source modules in this embodiment also lack projection data. Therefore, the image processing module of the X-ray scanning device in this embodiment is also configured to have a data compensation function, which can compensate for missing viewpoint data and / or repair the reconstructed image to improve image quality. The image processing module of the X-ray scanning device in this embodiment uses the same method as in the aforementioned embodiments for image reconstruction.

[0238] In addition to having the same advantages as the X-ray scanning device of the aforementioned embodiments, the X-ray scanning device of this embodiment also has the following advantages.

[0239] The X-ray scanning device of this embodiment is particularly suitable for use in airport carry-on baggage security inspection. Airport carry-on baggage is characterized by its small size (e.g., typically within 600mm*400mm) and large length, width, and thinness. When placed on a conveyor for inspection, its thickness is usually along the vertical direction, its width along the horizontal direction, and its length along the conveying direction. The X-ray scanning device of this embodiment arranges X-ray source modules on both the upper and lower sides of the scanning area to scan the baggage in the thickness direction. This allows for the acquisition of more projection data in the thinner direction. Furthermore, due to the small thickness of the baggage, the projection data in the thickness direction is less affected by self-occlusion and X-ray attenuation. Therefore, the projection data in the thickness direction is more accurate and clearer compared to other directions, which is beneficial for improving image quality. Meanwhile, the X-ray scanning device of this invention only arranges the X-ray source module on one side of the baggage in the width direction. In the width direction, the projection data is more affected by self-occlusion and X-ray attenuation of the baggage, resulting in lower projection data quality compared to the thickness direction. Arranging the X-ray source module on only one side of the baggage in the width direction can reduce the cost of the X-ray source while ensuring image quality.

[0240] Furthermore, although the X-ray scanning device of this embodiment does not have an X-ray source on the left side of the scanning area, it still has a right-side detector group opposite to the left side of the scanning area. This right-side detector group can receive X-rays from the X-ray source modules on both the upper and lower sides, increasing the corresponding detection data of X-rays from the upper and lower X-ray source modules. Therefore, compared to the case where detector groups are only placed on the opposite side of each X-ray source module, image quality can be improved.

[0241] Furthermore, this embodiment describes the situation where multiple X-ray source modules of the X-ray source are arranged in the same plane perpendicular to the transport direction of the object being detected, but the same applies to the situation where multiple X-ray source modules of the X-ray source are arranged in different planes perpendicular to the transport direction of the object being detected.

[0242] Furthermore, the embodiment is described using the example of multiple detector groups of the detector arranged in the same plane in the transport direction of the object being detected, but it is equally applicable to the case where multiple detector groups of the detector are arranged in different planes perpendicular to the transport direction of the object being detected.

[0243] In the foregoing embodiments, a X-ray scanning device was described in which the X-ray source surrounds the scanning area on the top, bottom, left, and right sides. According to other embodiments, this application also provides a X-ray scanning device, whose arrangement is basically the same as the X-ray scanning device of the foregoing embodiments. The main difference lies in the arrangement of the X-ray source. In this embodiment, the X-ray source surrounds the scanning area only on the top, left, and right sides; that is, the X-ray source surrounds the scanning area only above the conveying device, and no X-ray source module is provided below the conveying device (see details...). Figure 18 , Figure 18 (A schematic diagram of the layout of the radiation source and detector according to this embodiment is shown). Here, "above" of the transmission device includes not only directly above the transmission device, but also above the side of the transmission device; in addition, "above" of the transmission device is not strictly limited to being higher than the transmission device in height, and cases where it is approximately the same height as the transmission device or slightly lower than the transmission device are also included in the scope of this embodiment.

[0244] Specifically, in the X-ray scanning device of the aforementioned embodiment, each X-ray source module of the X-ray source 3 is a distributed multi-point source, and the multiple X-ray source modules can be arranged in a rectangular structure, polygonal structure, elliptical structure, etc., surrounding the scanning area. In this embodiment, the multiple X-ray source modules can still be distributed multi-point sources, but the difference is that the multiple X-ray source modules are arranged in a non-closed structure with an opening below the conveying device surrounding the scanning area, such as a rectangular structure, polygonal structure, elliptical structure, etc., with an opening below the conveying device. In the aforementioned embodiment, the X-ray source 3 is arranged in a non-continuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a non-continuous polygonal or non-continuous rounded rectangle structure, and other polygonal and elliptical structures. In this embodiment, the X-ray source is arranged in a non-continuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a non-continuous polygonal or non-continuous rounded rectangle structure, and other polygonal and elliptical structures with an opening below the conveying device, for example, relative to... Figure 2 The radiation source shown, in this embodiment, radiation source 3 at least does not include the radiation source module 33 below, and in some cases, it also does not include the portions of radiation source modules 32 and 34 below the transmission device 1; for example, relative to Figure 4 The radiation source shown in (b)-(c) of this embodiment does not include the radiation source module below the object being detected 6.

[0245] Furthermore, similar to the aforementioned embodiment, the X-ray source in this embodiment can also be composed of multiple single-point source groups, the only difference being that the X-ray source 3 in this embodiment does not include single-point sources at the bottom angle, the lower left oblique angle, and the lower right oblique angle.

[0246] Apart from the differences mentioned above, all other features of the radiation source in this embodiment are the same as those of radiation source 3 in the aforementioned embodiment.

[0247] The detector in this embodiment is essentially the same as the detector 4 in the aforementioned embodiment, except that in this embodiment, the detector is combined with a radiation source that surrounds the scanning area only on the upper, left, and right sides. There is no radiation source module on the same side as the detector group below the scanning area of ​​detector 4. Therefore, the disassembly and installation of the detector group below the scanning area of ​​detector 4 will not be hindered by the lower radiation source module. Thus, in addition to using the same mounting and fixing structure as in the aforementioned embodiment, the detector groups below the scanning area can also be disassembled or installed relative to the support frame 5 in a direction perpendicular to the transport direction of the object 6 being detected, without being hindered by the left or right radiation source module. Specifically, the aforementioned reference... Figure 16 The described installation and fixing structure is disassembled and assembled.

[0248] Furthermore, the relative arrangement of the X-ray source 3 and detector 4 in the X-ray scanning device of this embodiment is basically the same as that in the aforementioned embodiment. Specifically, similar to the aforementioned embodiment, the X-ray source 3 includes multiple X-ray source modules, each arranged around the scanning area and located in a plane perpendicular to the transport direction of the object 6 being detected, particularly in the same plane; the detector 4 includes multiple detector groups, each located in another plane perpendicular to the transport direction of the object 6 being detected, particularly in the same plane, and the ends of each detector group are connected to each other to be arranged around the scanning area. Furthermore, in the combined state of the X-ray source 3 and the detector 4, the detector 4 is arranged inside the X-ray source 3 in a direction perpendicular to the transport direction of the object 6 being detected, and the X-ray source 3 and the detector 4 at least partially overlap in the transport direction of the object 6 being detected. The multiple detector groups of the detector 4 can be any of the closed square, rectangular, polygonal, or elliptical structures surrounding the scanning area as described in the aforementioned embodiment. Unlike the aforementioned embodiment, the multiple X-ray source modules of the X-ray source 3 are arranged as a non-closed structure with an opening below the transport device surrounding the scanning area, such as a rectangular, polygonal, or elliptical structure with an opening below the transport device, as described above in this embodiment.

[0249] Similar to the previous embodiments, in this embodiment, the detector groups of detector 4 are preferably arranged so as not to obstruct the X-ray beams of the X-ray source modules on the same side, while being able to receive X-rays from the X-ray source modules on the other sides. Since both the X-ray source 3 and detector 4 are arranged in a ring shape (where the X-ray source 3 is a semi-closed ring with an opening at the bottom), the same detector group can be shared by different X-ray source modules of the X-ray source. Furthermore, the X-rays from each X-ray source module of the X-ray source 3 can be detected not only by the detector groups on the opposite side, but also by the detector groups on other sides; therefore, the X-rays from each X-ray source module can be detected by the detectors as much as possible. Thus, the detector in this embodiment can also improve image quality while reducing the number of detector groups and lowering equipment costs.

[0250] Furthermore, similar to the aforementioned embodiments, preferably, the detector crystals of each detector group of detector 4 are arranged at the end of the detector unit along the transport direction of the object being detected 6, and are arranged to be adjacent to the edge of the X-ray beam of the X-ray source module on the same side in the transport direction of the object being detected 6, but without obstructing the X-ray beam of the X-ray source module on the same side. This minimizes the coverage length of the optical path between the X-ray source and the detector, thereby reducing the overall equipment length.

[0251] Furthermore, similar to the aforementioned embodiments, more preferably, each of the X-ray source modules of the X-ray source 3 is arranged such that the X-ray beam avoids the detector group on the same side and irradiates the detector crystal of the detector group on the opposite side. Specifically, similar to the aforementioned embodiments, the X-ray source module can rotate relative to the target axis by a predetermined angle to adjust the exit angle of the X-ray beam of the X-ray source module, thereby irradiating the detector crystal at the center position of the X-ray beam. Since the detector crystal of the detector is located at the end of the detector unit and adjacent to the edge of the X-ray beam of the X-ray source on the same side in the transport direction of the object being detected 6, the X-ray source module can rotate only a very small predetermined angle, for example, 1.5 degrees, to irradiate the detector crystal at the center position of the X-ray beam. In this way, the adverse effects of the X-ray beam obliquely entering the surface of the detector crystal on imaging can be minimized. Similar to the aforementioned embodiments, the X-ray source module can rotate about the target axis or other axes, or adjust the exit angle of the X-ray beam by other suitable methods mentioned in the aforementioned embodiments.

[0252] Furthermore, similar to the aforementioned embodiments, the ends of adjacent X-ray source modules in this embodiment also lack projection data. Therefore, the image processing module of the X-ray scanning device in this embodiment is also configured to have a data compensation function, which can compensate for missing viewpoint data and / or repair the reconstructed image to improve image quality. The image processing module of the X-ray scanning device in this embodiment uses the same method as in the aforementioned embodiments for image reconstruction.

[0253] In addition to having the same advantages as the X-ray scanning device of the aforementioned embodiments, the X-ray scanning device of this embodiment also has the following advantages.

[0254] In this embodiment, the X-ray scanning device does not have an X-ray source module arranged below the conveying device, thus reducing the height of the conveying device and facilitating the transport of the items to be inspected to the conveying device. In addition, compared with the aforementioned embodiment where an X-ray source module is also arranged below the conveying device, this embodiment can save equipment costs.

[0255] Furthermore, although the X-ray scanning device in this embodiment does not have a lower X-ray source, it still has an upper detector group opposite to the lower position. This upper detector group can receive X-rays from the left and right X-ray source modules, increasing the corresponding detection data of the X-rays from the left and right X-ray source modules. Therefore, compared to the case where a detector group is only set on the opposite side of each X-ray source module, the image quality can be improved.

[0256] Furthermore, this embodiment describes the situation where multiple X-ray source modules of the X-ray source are arranged in the same plane perpendicular to the transport direction of the object being detected, but the same applies to the situation where multiple X-ray source modules of the X-ray source are arranged in different planes perpendicular to the transport direction of the object being detected.

[0257] Furthermore, the embodiment is described using the example of multiple detector groups of the detector arranged in the same plane in the transport direction of the object being detected, but it is equally applicable to the case where multiple detector groups of the detector are arranged in different planes perpendicular to the transport direction of the object being detected.

[0258] In the foregoing embodiments, a radiation scanning device was described, in which the radiation source and detector surround the scanning area on the four sides (top, bottom, left, and right). According to other embodiments, this application also provides a radiation scanning device, which has a structure basically the same as the radiation scanning device of the foregoing embodiments, differing only in the arrangement of the radiation source and detector. The specific differences are as follows: In this embodiment, viewed from the transport direction of the object being detected, multiple radiation source modules of the radiation source are arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area. Similarly, multiple detector groups of the detector are also arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area. Furthermore, the openings of the detector's non-closed structure are opposite to the openings of the radiation source's non-closed structure. In addition, multiple detector groups of the detector are fixed in the same plane perpendicular to the transport direction of the object being detected, while multiple radiation source modules of the radiation source are fixed in multiple different planes perpendicular to the transport direction of the object being detected. For example, the radiation source module of the radiation source arranged on the opening side of the detector's non-closed structure is fixed in the same plane perpendicular to the transport direction of the object being detected, while other radiation source modules are fixed in other planes perpendicular to the transport direction of the object being detected.

[0259] The structure and arrangement of the radiation source of the radiation scanning device according to this embodiment are described in detail below.

[0260] Similar to the aforementioned embodiments, the X-ray scanning device in this embodiment includes multiple X-ray source modules, and each X-ray source module can be a distributed multi-point source. As a distributed multi-point source, each X-ray source module can have multiple target points, each target point of each X-ray source module can generate an X-ray beam independently, and each target point can generate an X-ray beam according to a predetermined timing sequence under the control of a control device. The X-ray beam can be a fan-shaped beam with an angle A, such as... Figure 3 As shown. Of course, the shape of the ray beam is not limited to a fan-shaped beam; it can also be a cone-shaped beam, a parallel beam, or other shapes, which can be specifically set according to needs.

[0261] In the aforementioned embodiments, when viewed along the transport direction of the object being detected, multiple X-ray source modules of the X-ray source surround the scanning area on four sides. However, in this embodiment, when viewed along the transport direction of the object being detected, the multiple X-ray source modules are arranged around the scanning area only on three sides; that is, they are arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area. Specifically, as... Figure 19-21 As shown ( Figure 19 This is a three-dimensional schematic diagram of the layout of the X-ray source and detector of the X-ray scanning device according to this embodiment. Figure 20 yes Figure 19 The diagram shows a side view of the X-ray source and detector along the transport direction of the object being detected. Figure 21 yes Figure 19 The diagram shows a top view of the layout of the X-ray source and detector, where the X-ray source modules on the left and right sides of the scanning area are arranged in the same plane perpendicular to the transport direction of the object being detected (e.g., ...). Figure 21 The solid line at the exit position of the X-ray is shown in the image, while the X-ray source module below the scanning area is arranged in another plane perpendicular to the transport direction of the object being inspected (e.g., ...). Figure 21(As shown by the dashed line indicating the ray exit position), viewed from the transport direction of the object being inspected, the ray source 3 includes ray source modules 31, 32, and 33 respectively arranged on the left, right, and lower sides of the scanning area. The ray source modules 31, 32, and 33 form a non-closed structure surrounding the scanning area with an opening on the upper side. In the illustrated embodiment, the ray source modules are linear distributed multi-point sources, and the non-closed structure of the ray source is a right-angled rectangular structure with an opening on the upper side of the scanning area. The ray source modules 31, 32, and 33 of the ray source 3 are not limited to linear distributed multi-point sources; according to other embodiments, they can also be arc-shaped, polygonal, or other shapes. Linear, arc-shaped, or polygonal ray source modules can be set or combined as needed, so that viewed from the transport direction of the object being inspected, the ray source 3 can present a rounded rectangular structure, polygonal structure, elliptical structure, etc., surrounding the scanning area with an opening on the upper side. Furthermore, when viewed along the transport direction of the object being inspected, the X-ray source module of X-ray source 3 is not limited to being located on the left, right, and bottom sides of the scanning area. It can also be located, for example, on the top, left, and right sides; on both the top and bottom sides and the left side; or on both the top and bottom sides and the right side. The specific configuration can be determined according to the actual application scenario. In the following description of this embodiment, the case where the X-ray source module is located on the left, right, and bottom sides of the scanning area is used as an example. However, the described principle also applies to cases where the X-ray source module is arranged on any other three sides.

[0262] Similar to the aforementioned embodiments, the multiple radiation source modules of this embodiment are also independently detachable and installable. That is, each radiation source module has a separate cavity to house its respective radiation generating device. Each radiation source module having a separate cavity means that multiple target points of each radiation source module share a single vacuum cavity. The spacing between the multiple target points within the vacuum cavity of each radiation source module 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 a single radiation source module can be 192, 264, etc., and the spacing between target points in a single radiation source module can be 4mm, 12mm, etc. Having a separate cavity for each radiation source module has the following advantages: compared to a radiation source with an integrated annular cavity (i.e., all target points of the radiation source are located within the same annular vacuum cavity), the outer shell size and internal vacuum cavity volume of a single radiation source module can be reduced, resulting in a smaller volume and lighter weight, thus facilitating the disassembly and installation of the radiation source; furthermore, using a separate vacuum cavity for each radiation source module reduces the risk of internal arcing during maintenance of the radiation source module.

[0263] Furthermore, similar to the aforementioned embodiments, each radiation source module of radiation source 3 is provided with an installation and positioning structure to facilitate the installation and adjustment of the radiation source modules. With the aid of the installation and positioning structure, each radiation source module of radiation source 3 can be installed and fixed at a predetermined position in the radiation scanning equipment. In addition, with the aid of the installation and positioning structure, the radiation source module can also be rotated to adjust the beam exit angle. Due to their different positions in the radiation scanning equipment, each radiation source module of radiation source 3 can adopt different installation methods and have different installation and positioning structures. For example, radiation source modules located on the left and right sides of the scanning area can be installed by hoisting using equipment such as an overhead crane, while radiation source modules located on the lower side of the scanning area are not suitable for hoisting and can adopt the installation and positioning structure described in the aforementioned embodiments (such as...). Figure 5 The installation and positioning structure shown is used to install and fix the beam or adjust the beam exit angle.

[0264] Furthermore, similar to the aforementioned embodiments, the radiation source 3 can also be composed of multiple single-point sources. Each radiation source module can be a group of single-point sources, and each group of single-point sources includes at least two single-point sources. Each single-point source can emit a radiation beam independently, such as a fan-shaped beam with an angle A (e.g., ...). Figure 3 (As shown). Each single-point source of X-ray source 3 can emit X-rays according to a predetermined timing sequence under the control of the control device of the X-ray scanning system. When each X-ray source module is a group of single-point sources, viewed from the transport direction of the object being inspected 6, the single-point source groups are at least distributed at the bottom view, left view, and right view, and can be further distributed at corner oblique view, such as the lower left oblique view and the lower right oblique view, and even further include the upper left oblique view and the upper right oblique view (e.g. Figure 22 (As shown).

[0265] The arrangement of the detector 4 in the X-ray scanning device of this embodiment will now be described in detail. Similar to the aforementioned embodiments, the detector 4 may include multiple detector groups, which are preferably located in the same plane perpendicular to the transport direction of the object 6 being inspected. Furthermore, similar to the aforementioned embodiments, the detector group in this embodiment is also a detector array comprising multiple detector units.

[0266] Furthermore, in the aforementioned embodiments, when viewed along the transport direction of the object being detected, the multiple detector groups of detector 4 are arranged around the scanning area on all four sides, forming a closed structure around the scanning area. However, in this embodiment, when viewed along the transport direction of the object being detected, the detector groups of detector 4 are arranged around the scanning area only on three sides, that is, arranged in a non-closed structure with an opening on one side of the scanning area. Specifically, as... Figure 19-21As shown, detector 4 includes detector groups 41, 42, and 43 respectively arranged on the left, right, and upper sides of the scanning area. The ends of detector groups 41, 42, and 43 are interconnected to form a non-closed structure with an opening on the lower side of the scanning area surrounding the scanning area. Figure 19-21 In the illustrated embodiment, detector groups 41, 42, and 43 are linear detector arrays comprising multiple detector elements arranged in a straight line, thereby forming a non-closed rectangular or square structure with an opening on the lower side of the scanning area. However, the detector 4 in this embodiment is not limited to the above structure and can be arranged in other structures. For example, detector 4 may include three longer linear detector arrays and two shorter linear detector arrays, which are arranged alternately around the scanning area and connected at their ends to form a non-closed polygonal structure with an opening on the lower side of the scanning area (e.g., ...). Figure 23 (As shown). Furthermore, detector 4 may also include a plurality of longer linear detector arrays and a plurality of shorter linear detector arrays, these detector arrays being alternately arranged around the scanning area and interconnected at their ends to form other non-closed polygonal structures with openings on the lower side of the scanning area. The detector group of detector 4 in this embodiment may also be an arc-shaped detector array, with multiple arc-shaped detector arrays arranged around the scanning area and interconnected at their ends to form a non-closed elliptical structure with openings on the lower side of the scanning area. The detector group of detector 4 in this embodiment may also be a combination of linear detector arrays and arc-shaped detector arrays to form other shapes of non-closed structures with openings on the lower side of the scanning area, such as rounded rectangular structures with openings on the lower side of the scanning area. Here, the structure of the detector unit and the structure of the detector group in the form of linear detector arrays and arc-shaped detector arrays are exactly the same as the structures described in the foregoing embodiments.

[0267] Furthermore, the detector group of detector 4 is not limited to Figure 19-21 The arrangement shown is on the left, right, and top sides of the scanning area, and can also be arranged, for example, on the bottom, left, and right sides; on both top and bottom sides and the left side; or on both top and bottom sides and the right side, as long as the opening of the non-closed structure of the X-ray source is aligned with the opening of the non-closed structure of the X-ray source. In this embodiment, using... Figure 19-21 The example shown illustrates the placement of the detector group on the left, right, and top sides of the scanning area, but this embodiment is also applicable to situations where the detector group is arranged on any other three sides.

[0268] Furthermore, similar to the aforementioned embodiments, in some embodiments, each detector group of detector 4 is independently detachable and installable, thereby improving the maintainability of the detector. Moreover, similar to the aforementioned embodiments, in this embodiment, the multiple detector groups of detector 4 are configured to move along the transport direction of the object 6 to be detected for detachment and installation. Thus, when the detector groups of detector 4 are arranged inside the radiation source 3 perpendicular to the transport direction of the object 6, the detector groups can be disassembled, adjusted, and maintained without disassembling the radiation source, further improving the maintainability of the detector. Figure 19-21 The detector 4 shown, with detector groups 41, 42, and 43, can be moved parallel to the transport direction of the object being detected 6 for disassembly and installation, thus allowing for disassembly, adjustment, and maintenance without disassembling the X-ray source modules 31, 32, and 33. The detector groups 41, 42, and 43 of the detector 4 can employ the same mounting and fixing structure as described in the foregoing embodiments (e.g., Figure 9 The illustrated embodiments and their variations, etc., can be moved along the transport direction of the object 6 to be inspected relative to their mounting position in the X-ray scanning equipment to be detached from or installed at the mounting position. For example, similar to the foregoing embodiments, detector assemblies 41, 42, and 43 can be mounted to or detached from the support frame 5 of the X-ray scanning equipment via detector arms.

[0269] Furthermore, when the opening of the non-enclosed structure of the radiation source or detector faces the left or right side of the scanning area, the detector assembly of detector 4 can also be moved perpendicular to the transport direction of the object being detected for disassembly and installation. For example... Figure 24 As shown, when viewed along the transport direction of the object being detected, the openings of the non-enclosed structures of the X-ray source modules 31, 32, and 33 face the left side of the scanning area, and the openings of the non-enclosed structures of the detector groups 41, 42, and 43 of the detector 4 face the right side of the scanning area. In this case, the detector groups 41, 42, and 43 can be moved relative to their mounting positions (e.g., support frame 5) in a direction perpendicular to the transport direction of the object being detected for removal or installation. The specific movement direction is as follows: Figure 24 As indicated by the arrow in Figure (b). Since there is no X-ray source module on the left side of the scanning area, the X-ray source does not obstruct the aforementioned movement of the detector, allowing for easy disassembly of the detector assembly. The mounting and fixing structure described above, suitable for disassembling and assembling the detector assembly in the vertical direction along the transport direction of the object being inspected, can be used, for example, refer to... Figure 15-17 The described installation and fixing structure and its variations enable this disassembly and assembly method.

[0270] Furthermore, the detector group of detector 4 can also be configured such that part of it moves along the conveying direction of the object being detected for disassembly and installation, and another part moves perpendicular to the conveying direction of the object being detected for disassembly and installation. For example, in Figure 19-21 In the illustrated embodiment, if the highest point of the X-ray source modules 31 and 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 can also be moved in the direction perpendicular to the transport direction of the object being detected for disassembly and installation. A specific installation and fixing structure can be adopted... Figure 15 The illustrated embodiments and their variations are shown. Similarly, if the detector group of detector 4 is arranged on the left, right, and lower sides of the scanning area, and the lower detector group is lower than the lowest point of the left and right X-ray source modules, the lower detector group can also be moved perpendicular to the transport direction of the object being detected for disassembly and installation. A specific mounting and fixing structure can be adopted... Figure 16 The embodiments and their variations are shown.

[0271] Furthermore, similar to the aforementioned embodiments, the multiple detector groups of the detector are located in the same plane perpendicular to the transport direction of the object being detected 6 after installation, thanks to their respective mounting surfaces and corresponding mounting reference surfaces (set in the same plane perpendicular to the transport direction of the object being detected 6).

[0272] The relative arrangement of the X-ray source 3 and detector 4 in the X-ray scanning device according to this embodiment is further described below. The relative arrangement of the X-ray source 3 and detector 4 in this embodiment differs from that in the previous embodiments. In this embodiment, in the combined state of the X-ray source and detector, the opening of the non-closed structure of the X-ray source is arranged opposite to the opening of the non-closed structure of the detector. Multiple detector groups of the detector are fixed in the same plane perpendicular to the transport direction of the object being detected, while multiple X-ray source modules of the X-ray source are arranged in multiple planes perpendicular to the transport direction of the object being detected. For example, the X-ray source module of the X-ray source arranged on one side of the opening of the non-closed structure of the detector is fixed in the same plane perpendicular to the transport direction of the object being detected, while other X-ray source modules are fixed in other planes perpendicular to the transport direction of the object being detected. These other X-ray source modules can be located in another single plane perpendicular to the transport direction of the object being detected or in multiple different planes, preferably in another single plane. In this embodiment, other X-ray source modules are arranged in other single planes perpendicular to the transport direction of the object being detected (e.g.,...). Figure 21 The example shown is used to illustrate this, but it is equally applicable to other cases with different planes.

[0273] In the combined state of the X-ray source and detector, the X-ray source can be any structure as described in the previous embodiments, such as a rectangular, polygonal, or elliptical structure with an opening on one side of the scanning area when viewed along the transport direction of the object being detected. The detector can be any structure as described in the previous embodiments, such as a square, rectangular, polygonal, or elliptical structure with an opening on one side of the scanning area, as long as the openings of the X-ray source and detector structures are arranged opposite each other. Below, we will use... Figure 19-21 The illustrated embodiment is used as an example to describe the detailed arrangement of the X-ray source 3 and detector 4 in the combined state, but the same principle applies to any other combination of X-ray source 3 and detector 4.

[0274] Specifically, similar to the aforementioned embodiments, based on the combination of X-ray source 3 and detector 4 as described above, and considering the annular arrangement (semi-closed ring) of the detectors, the detector groups 41, 42, and 43 of detector 4 can be arranged to receive X-rays from each of the X-ray source modules on the other sides, allowing multiple X-ray source modules to share each detector group of the detector. This reduces the number of detector groups. Furthermore, since the X-rays from X-ray source modules 31 and 32 can be detected not only by the detector groups 42 and 41 on opposite sides, but also by detector groups on other sides besides those on the same side, and the X-rays from X-ray source module 33 can be received by all detector groups 41, 42, and 43, the X-rays from each X-ray source module can be detected by the detectors as much as possible. As a result, although the X-ray source modules and detectors are arranged only on three sides of the scanning area, the X-ray scanning device of this embodiment can still acquire sufficient detection data for image reconstruction. Simultaneously, by reducing the number of X-ray source modules and detector groups, the weight of the device can be reduced, thus facilitating the construction of a lightweight X-ray scanning device.

[0275] Furthermore, specifically, the radiation source module 33 of the radiation source 3 is arranged in the same plane as the detector groups 41, 42, and 43 of the detector 4, perpendicular to the transport direction of the object being detected. This specifically means that the radiation outlet of the radiation source module 33 is directly opposite the detector crystal of each detector group (e.g., ...). Figure 21 (As shown). Therefore, the X-ray beam of the X-ray source module 33 can cover more detector crystals, which is beneficial for acquiring more detection data and improving image quality.

[0276] Furthermore, specifically, similar to the detector groups in the aforementioned embodiments, viewed from the direction of transport of the object being detected, i.e., in the direction perpendicular to the direction of transport of the object being detected, the detector groups 41 and 42 on the same side as the other X-ray source modules 31 and 32 of detector 4 are respectively arranged between the other X-ray source modules 31 and 32 of X-ray source 3 and the scanning area, and along the direction of transport of the object being detected, the other X-ray source modules 31 and 32 and the detector groups 41 and 42 on the same side at least partially overlap (e.g., ...). Figure 21 (As shown). This reduces the length of the equipment covered by the optical path between the X-ray source and the detector, thereby reducing the total length of the equipment.

[0277] In addition, similar to the detector groups in the aforementioned embodiments, when detector groups 41 and 42 at least partially overlap with X-ray source modules 31 and 32 in the direction of transport of the object being detected, detector groups 41 and 42 are configured to avoid the X-ray beams of X-ray source modules 31 and 32 on the same side and receive X-rays from all other side X-ray source modules except for the X-ray source modules on the same side.

[0278] Furthermore, similar to the aforementioned embodiments, the detector crystals of each detector group of detector 4 are arranged at the end of the detector unit along the transport direction of the object being detected. The detector groups 41 and 42 of detector 4 on the same side as the other X-ray source modules 31 and 32 are arranged so that they are adjacent to the edges of the X-ray beams of the same-side X-ray source modules 31 and 32 in the transport direction of the object being detected, but do not obstruct the X-ray beams of the same-side X-ray source modules 31 and 32. Thus, the X-ray source 3 and detector 4 can overlap to the maximum extent in the transport direction of the object being detected 6, thereby minimizing the length of the equipment covered by the optical path between the X-ray source and the detector, and consequently reducing the overall length of the equipment.

[0279] More specifically, similar to the aforementioned embodiments, the X-ray source modules 31 and 32 of the X-ray source 3 are arranged such that the X-ray beams avoid the detector groups 41 and 42 on the same side and irradiate the detector crystals of the detector groups on the opposite side. Furthermore, as in the aforementioned embodiments, the X-ray source modules 31 and 32 can rotate relative to their respective target axes by a predetermined angle to adjust the exit angle of their respective X-ray beams, thereby ensuring that the center position of each X-ray beam irradiates the detector crystal on the opposite side. Since the detector crystals of the detectors are located at the end of the detector unit in the direction of transport of the object being detected and are arranged adjacent to the edge of the X-ray beam of the same side X-ray source, the X-ray source modules can rotate only a very small predetermined angle, for example, 1.5 degrees, to ensure that the center position of the X-ray beam irradiates the detector crystal. This minimizes the adverse effects of the X-ray beam obliquely entering the surface of the detector crystal on imaging. In addition, similar to the aforementioned embodiments, the X-ray source modules can rotate about the target axis or other axes, or adjust the exit angle of the X-ray beam using other suitable methods mentioned in the aforementioned embodiments.

[0280] Furthermore, similar to the aforementioned embodiments, projection data may also be missing at the ends of adjacent radiation source modules in this embodiment. For example, in situations such as... Figure 19-21 In the illustrated embodiment, the spacing between target points at adjacent ends of X-ray source modules 31 and 33, and between adjacent ends of X-ray source modules 33 and 32, may be greater than the spacing between target points within each X-ray source. Therefore, projection data is missing at these ends. Thus, similar to the aforementioned embodiments, the image processing module of the X-ray scanning device in this embodiment is also configured to have a data compensation function, capable of compensating for missing viewpoint data and / or repairing reconstructed images to improve image quality. The image processing module of the X-ray scanning device in this embodiment uses the same method for image reconstruction as in the aforementioned embodiments.

[0281] Of course, according to other embodiments, since the X-ray source modules 31, 32 and X-ray source module 33 are arranged in different planes perpendicular to the transport direction of the object being detected, the adjacent ends of X-ray source modules 31, 33 and / or the adjacent ends of X-ray source modules 33, 32 can be specifically arranged to overlap along the transport direction of the object being detected, such that the target points at the adjacent ends of adjacent X-ray source modules 31, 33 or 32, 33 overlap, or the distance between target points is not greater than the distance between target points within each X-ray source. In this case, there is no missing projection data, and correspondingly, the data compensation function of the image processing module is not required for image reconstruction.

[0282] In addition to having the same advantages as the X-ray scanning device of the foregoing embodiments, the X-ray scanning device of this embodiment also has the following advantages.

[0283] In this embodiment, the X-ray source and detector surround the scanning area only on three sides. Compared to the case where the X-ray source and detector surround the scanning area on four sides (either one or both), sufficient data can be acquired for image reconstruction. This also reduces equipment cost and weight, thereby providing a lightweight X-ray scanning device.

[0284] Furthermore, in this embodiment, the X-ray source module on one side of the scanning area is positioned directly opposite the detector crystal of the detector, which allows the X-ray source module to cover more detector units, thereby increasing the amount of data and improving image quality.

[0285] The above describes a radiation scanning device in which the radiation source surrounds the scanning area on the four sides (up, down, left, right) or any three of them. According to other embodiments, the radiation source can also be arranged to surround the scanning area only on any two of the four sides (up, down, left, right).

[0286] The above describes the installation and positioning structure of each radiation source module for radiation sources. The above installation and positioning structure is not limited to use in the radiation scanning equipment of this application, but can also be used in other suitable radiation scanning equipment.

[0287] The above describes various mounting and fixing structures for detector arrays. These mounting and fixing structures are not limited to use in the X-ray scanning equipment of this application, but can also be used in other suitable X-ray scanning equipment. The mounting and fixing structures of each embodiment can be used individually or in combination in a single X-ray scanning equipment.

[0288] The foregoing description is for illustrative purposes only and is not intended to be exhaustive or to limit the application to the exact form described. Many modifications and variations are possible without departing from the inventive principles of this application. The described embodiments are intended to best explain the principles of this application and its practical application. The foregoing description enables those skilled in the art to better utilize and practice the various embodiments and modifications of this application. The scope of this application is defined by the appended claims.

Claims

1. A X-ray scanning device, comprising: A conveying device that transports the object to be detected through the scanning area of ​​the X-ray scanning device; The X-ray source includes multiple X-ray source modules, each X-ray source module including at least one X-ray source point for emitting X-ray beams, the multiple X-ray source modules being arranged around the scanning area in a non-closed structure with openings on the left or right side of the scanning area, and fixed in a plane perpendicular to the transport direction of the object being detected; as well as A detector for detecting rays transmitted through the object being detected during scanning includes multiple detector groups whose ends are interconnected to arrange the detectors in a closed structure around the scanning area, and the multiple detector groups are fixed in a plane perpendicular to the transport direction of the object being detected. The detector is located between the X-ray source and the scanning area in a direction perpendicular to the transport direction of the object being detected. The X-ray source and the detector are arranged to at least partially overlap along the transport direction of the object being detected, and the plurality of X-ray source modules can be independently disassembled and installed. Each detector group is a detector array comprising multiple detector units. Each detector unit in the detector group includes a detector crystal for receiving radiation transmitted through the object being detected during scanning. The detector crystal is disposed at the end of the detector unit along the transport direction of the object being detected and is arranged adjacent to the edge of the radiation beam of the radiation source module on the same side in the transport direction of the object being detected, but without obstructing the radiation beam. The various radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and that the center of the radiation beam illuminates the detector crystal of the detector group on the opposite side. The various radiation source modules are arranged in different planes perpendicular to the transport direction of the object being detected. The individual detector groups of the detector can be disassembled and installed independently of each other, and The detector groups on the upper and lower sides of the scanning area and at the opening of the X-ray source structure are configured to move perpendicular to the transport direction of the object being detected for disassembly and installation, while the detector groups on the opposite side of the opening of the X-ray source structure are configured to move along the transport direction of the object being detected for disassembly and installation.

2. The X-ray scanning device according to claim 1, wherein, The radiation source module is a distributed multi-point source, and the multiple radiation source modules form a non-closed structure with openings on the left or right side of the scanning area.

3. The X-ray scanning device according to claim 2, wherein, Each of the multiple X-ray source modules is a linear distributed multi-point source. The multiple linear distributed multi-point sources are respectively arranged on the upper, lower, and right sides or the upper, lower, and left sides of the scanning area to form a non-closed structure with an opening on the left or right side of the scanning area. The ends of the multiple linear distributed multi-point sources are directly connected or arranged at intervals.

4. The X-ray scanning device according to claim 2, wherein, The plurality of radiation source modules include a plurality of first distributed multi-point sources and a plurality of second distributed multi-point sources, wherein the plurality of first distributed multi-point sources and the plurality of second distributed multi-point sources are arranged alternately, and their ends are directly connected or spaced apart.

5. The X-ray scanning device according to claim 4, wherein, The first distributed multi-point source is a linear distributed multi-point source, and the second distributed multi-point source is a linear distributed multi-point source with a length shorter than the first distributed multi-point source, or an arc-shaped distributed multi-point source with a length shorter than the first distributed multi-point source.

6. The X-ray scanning device according to claim 1, wherein, Each of the plurality of X-ray source modules is a single-point source group, and each single-point source group includes at least two single-point sources.

7. The X-ray scanning apparatus according to any one of claims 1-5, wherein, Each radiation source module has a separate cavity to house its respective radiation generating device.

8. The X-ray scanning device according to claim 7, wherein, Each X-ray source module includes a separate vacuum chamber for accommodating multiple target points.

9. The X-ray scanning device according to claim 8, wherein, The spacing between target points within each X-ray source module is smaller than the spacing between target points at the ends of adjacent X-ray source modules.

10. The X-ray scanning device according to claim 7, wherein, Each radiation source module has a separate cavity equipped with an installation and positioning structure for installing and positioning the radiation source module, and for rotating the radiation source module to adjust the beam exit angle.

11. The X-ray scanning apparatus according to any one of claims 1-6 and 8-10, wherein, The plurality of detector groups are arranged in a closed polygonal structure surrounding the scanning area.

12. The X-ray scanning device according to claim 11, wherein, Each detector group is a linear detector array, which includes four linear detector arrays arranged on the top, bottom, left, and right sides of the scanning area to form a rectangular structure.

13. The X-ray scanning device according to claim 11, wherein, Each detector group is a linear detector array, which includes multiple first linear detector arrays and multiple second linear detector arrays, the second linear detector arrays being shorter than the first linear detector arrays. The multiple first linear detector arrays and the multiple second linear detector arrays are arranged alternately around the scanning area to form a polygonal structure.

14. The X-ray scanning device according to claim 1, wherein, Each detector group of the detector includes a detector arm, and the X-ray scanning device includes a support frame fixed relative to the mounting platform of the X-ray scanning device. The detector groups are mounted to or detached from the support frame via the detector arms.

15. The X-ray scanning apparatus according to claim 11, wherein, Each detector group of the detector is configured to avoid the radiation beams from the same-side radiation source module and receive radiation from all other side radiation source modules except the same-side radiation source module.

16. The X-ray scanning device according to claim 1, wherein, Each X-ray source module is configured to rotate around the target axis so that the center of the X-ray beam irradiates the detector crystal of the detector group on the opposite side.

17. The X-ray scanning apparatus according to any one of claims 1-6, 8-10, and 12-16 further includes an image processing module configured to perform data compensation and / or image reconstruction repair for missing projection data at the end of the X-ray source module to obtain a complete reconstructed image.

18. The X-ray scanning apparatus according to claim 17, wherein, The image processing module is configured to reconstruct images using an iterative method, an image thresholding method, or a combination of both.

Images