Detector mounting and fixing structure for ray scanning equipment and ray scanning equipment

Abstract

The present application relates to a mounting and fixing structure for a detector of a ray scanning device and the ray scanning device. The ray scanning device includes a detector and a set support frame. The detector includes one or more detector groups. The detector groups are fixedly mounted on the support frame or removed from the support frame via the mounting and fixing structure. The mounting and fixing structure includes: a first mounting portion, which is fixedly mounted on the detector group; a second mounting portion, which is fixedly mounted on the support frame and can cooperate with the first mounting portion for linear movement. The detector group can move along the second mounting portion to a predetermined mounting position when the first mounting portion and the second mounting portion cooperate with each other; and a fixing device, which is arranged on one side of the detector group along the width direction and is used to fix the detector group relative to a mounting reference surface on the support frame.

Description

Technical Field

[0001] The present application relates to the field of radiation imaging, and in particular to a mounting and fixing structure of a detector for a ray scanning device and the ray scanning device. Background Art

[0002] Existing static CT (computer tomography) (distributed multi-point source) or multi-view (single-point source) security inspection equipment usually arranges multiple different viewpoints in different planes perpendicular or inclined to the conveying direction of the inspected object, or concentrates all radiation sources in a single annular or rectangular closed 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 only corresponds to one set of distributed multi-point sources or one single-point source.

[0003] There is also a static CT with a double-ring structure design in the prior art, which simulates the working principle of the slip ring CT and arranges the radiation source and the detector on two different rings. The radiation source ring and the detector ring are separated by a certain distance along the conveying direction of the inspected object. Summary of the invention

[0004] The above-mentioned static CT (distributed multi-point source) or multi-view (single-point source) equipment usually includes multiple planar optical paths, and the multiple planar optical paths are arranged along the length direction of the equipment (i.e., the conveying direction of the detected object). This arrangement method results in a long optical path coverage range of the static CT (distributed multi-point source) or multi-view (single-point source) equipment, which is not conducive to shortening the length of the whole machine and reducing the weight of the whole machine.

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

[0006] In addition, in the device arranged as described above, concentrating all radiation sources in a single annular or rectangular closed cavity will increase the complexity of the device and reduce the reliability of the device, especially for the device that needs to maintain a high vacuum degree; in addition, the maintainability of the radiation source is also poor.

[0007] In addition, in the static CT with a double-ring structure design as described above, although the arrangement of the radiation source ring and the detector ring can ensure that a single detector is shared by multiple radiation sources, it still does not solve the problem of poor reliability and maintainability caused by concentrating the radiation sources in a single annular closed cavity. At the same time, if the distance between the radiation source ring and the detector ring is too close, the detector can only be replaced or maintained from the inside of the ring, and the maintainability of the detector is also poor. If the distance between the radiation source ring and the detector ring is large enough, the detector can be replaced or maintained from the outside of the ring. Such an arrangement will increase the coverage range of the optical path, resulting in an increase in the length of the equipment. At the same time, there is an inclination angle between the center of the radiation beam and the surface of the detector crystal, and the radiation beam obliquely hits the detector crystal, affecting the image quality.

[0008] In order to solve the above problems, an embodiment of the present application provides a ray scanning device, which can solve the problems of poor reliability and maintainability caused by multiple ray sources being concentrated in a single annular closed cavity. At the same time, each detector group of the detector can be shared by multiple ray source modules, thereby reducing the equipment cost. In addition, the detector can be easily replaced or maintained while minimizing the optical path coverage range, and at the same time, the inclination angle between the center of the ray beam and the detector surface can be reduced to improve image quality.

[0009] An embodiment of the present application also provides a ray scanning device, which includes: a conveying device, which transports the object to be detected through a scanning area of ​​the ray scanning device; a ray source, which includes a plurality of ray source modules, each ray source module includes at least one ray source point that emits a ray beam, and the plurality of ray source modules are arranged around the scanning area above the conveying device and fixed in a plane perpendicular to the conveying direction of the object to be detected; and a detector, which is used to detect rays transmitted through the object to be detected during scanning and includes a plurality of detector groups, the ends of the plurality of detector groups are interconnected to be arranged around the scanning area, and the plurality of detector groups are fixed in a plane perpendicular to the conveying direction of the object to be detected, wherein the detector is located between the ray source and the scanning area along a vertical direction of the conveying direction of the object to be detected, the ray source and the detector are arranged to at least partially overlap along the conveying direction of the object to be detected, and the plurality of ray source modules can be removed and installed independently of each other.

[0010] In the ray scanning device according to this embodiment, the ray source modules are only arranged around the scanning area above the conveying device, and no ray source modules are arranged below the conveying device. The detectors are arranged around the scanning area. Such ray scanning device can reduce the height of the conveying device, facilitate the transfer of the detected object to the conveying device of the ray scanning device, and can reduce the manufacturing cost while ensuring image quality.

[0011] According to some embodiments, the ray source module is a distributed multi-point source, and the multiple ray source modules surround the scanning area to form a non-enclosed structure open below the conveying device.

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

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

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

[0015] According to some embodiments, each of the multiple ray source modules is a single point source group, and the multiple single point source groups are arranged at least on the left side viewing angle, right side viewing angle, top viewing angle and corner oblique viewing angle above the conveying device, and each single point source group includes at least two single point sources.

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

[0017] According to some embodiments, the individual cavity of each ray source module is provided with an installation and positioning structure, and the installation and positioning structure is used to install and position the ray source module and to rotate the ray source module to adjust the beam output angle of the ray beam.

[0018] According to some embodiments, each detector group is a detector array including a plurality of detector units, and the plurality of detector groups are arranged in a closed square structure, a rectangular structure, a polygonal structure, or an elliptical structure surrounding the scanning area.

[0019] According to some embodiments, each detector group is a linear detector array, and the detector includes four linear detector arrays, and the four linear detector arrays are arranged on the upper, lower, 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 includes a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays are shorter than the first linear detector arrays, and the first linear detector arrays and the second linear detector arrays are alternately arranged around the scanning area to form a polygonal structure.

[0021] According to some embodiments, the detector groups of the detector are detachable and installable independently of each other.

[0022] According to some embodiments, each detector group of the detector is configured to be moved along a conveying direction of the detected object for removal and installation.

[0023] According to some embodiments, each detector group of the detector is constructed so that a part of the detector group moves along the conveying direction of the detected object for disassembly and installation, and another part of the detector group moves along the direction perpendicular to the conveying direction of the detected object for disassembly and installation.

[0024] According to some embodiments, each detector group of the detector includes a detector arm, the radiation scanning device includes a support frame fixed relative to a mounting platform of the radiation scanning device, and the detector group is moved via the detector arm along a conveying direction of the detected object or a direction perpendicular to the conveying direction of the detected object to be installed on or removed from the support frame.

[0025] According to some embodiments, each detector group of the detector is configured to avoid ray beams of ray source modules on the same side and receive rays from all other ray source modules except the ray source modules on the same side.

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

[0027] According to some embodiments, each radiation source module of the radiation source is arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystals of the detector group on the opposite side.

[0028] According to some embodiments, each radiation source module is configured to rotate about the target axis so that the center position of the radiation beam irradiates the detector crystals of the detector group on the opposite side.

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

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

[0031] An embodiment of the present application also provides a ray scanning device, which includes: a conveying device, which transports the object to be detected through a scanning area of ​​the ray scanning device; a ray source, which includes a plurality of ray source modules, each ray source module includes at least one ray source point for emitting a ray beam, and the plurality of ray source modules are arranged around the scanning area in a non-enclosed structure that is open on the left or right side of the scanning area, and are fixed in a plane perpendicular to the conveying direction of the object to be detected; and a detector, which is used to detect rays transmitted through the object to be detected during scanning and includes a plurality of detector groups, the ends of the plurality of detector groups are interconnected to be arranged around the scanning area, and the plurality of detector groups are fixed in a plane perpendicular to the conveying direction of the object to be detected, wherein the detector is located between the ray source and the scanning area along a direction perpendicular to the conveying direction of the object to be detected, the ray source and the detector are arranged to at least partially overlap along the conveying direction of the object to be detected, and the plurality of ray source modules can be removed and installed independently of each other.

[0032] In the ray scanning device according to this embodiment, the ray source modules are arranged around the scanning area on the upper side, the lower side, and the left side or the right side of the scanning area, and the detectors are arranged around the scanning area. Such ray scanning device is suitable for detecting airport carry-on luggage. It utilizes the characteristics of airport carry-on luggage that is large in width and small in thickness, and considers the effects of baggage self-occlusion and ray attenuation on projection data, thereby reducing manufacturing costs while ensuring high image quality.

[0033] According to some embodiments, the ray source module is a distributed multi-point source, and the multiple ray source modules surround the scanning area to form a non-enclosed structure that is open on the left or right side of the scanning area.

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

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

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

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

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

[0039] According to some embodiments, the cavity of each ray source module includes a separate vacuum cavity for accommodating a plurality of targets.

[0040] According to some embodiments, the spacing between target points in each ray source module is smaller than the spacing between target points at ends of adjacent ray source modules.

[0041] According to some embodiments, the individual cavity of each ray source module is provided with an installation and positioning structure, and the installation and positioning structure is used to install and position the ray source module and to rotate the ray source module to adjust the beam output angle of the ray beam.

[0042] According to some embodiments, each detector group is a detector array including a plurality of detector units, and the plurality of detector groups are arranged in a closed square structure, a rectangular structure, a polygonal structure, or an elliptical structure surrounding the scanning area.

[0043] According to some embodiments, each detector group is a linear detector array, and the detector includes four linear detector arrays, and the four linear detector arrays are arranged on the upper, lower, 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 includes a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays are shorter than the first linear detector arrays, and the plurality of first linear detector arrays and the plurality of second linear detector arrays are alternately arranged around the scanning area to form a polygonal structure.

[0045] According to some embodiments, the detector groups of the detector are detachable and installable 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 radiation source structure are configured to move perpendicular to the conveying direction of the detected object for disassembly and installation, and the detector groups on the opposite side of the opening of the radiation source structure are configured to move along the conveying direction of the detected object for disassembly and installation.

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

[0048] According to some embodiments, each detector group of the detector is configured to avoid ray beams of ray source modules on the same side and receive rays from all other ray source modules except the ray source modules on the same side.

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

[0050] According to some embodiments, each radiation source module of the radiation source is arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystals of the detector group on the opposite side.

[0051] According to some embodiments, each radiation source module is configured to rotate about the target axis so that the center position of the radiation beam irradiates the detector crystals of the detector group on the opposite side.

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

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

[0054] An embodiment of the present application also provides a ray scanning device, which includes a conveying device that transports an object to be detected through a scanning area of ​​the ray scanning device; a ray source, which includes a plurality of ray source modules, each ray source module includes at least one ray source point that emits a ray beam, and when viewed along the conveying direction of the object to be detected, the plurality of ray source modules are arranged around the scanning area in a non-enclosed structure that is open on one side of the scanning area; and a detector, which is used to detect rays transmitted through the object to be detected during scanning and includes a plurality of detector groups, when viewed along the conveying direction of the object to be detected, the ends of the plurality of detector groups are interconnected and arranged around the scanning area in a non-enclosed structure that is open on one side of the scanning area, wherein the opening of the non-enclosed structure of the ray source and the opening of the non-enclosed structure of the detector are arranged opposite to each other, and the plurality of detector groups of the detector are fixed in the same plane perpendicular to the conveying direction of the object to be detected, and the plurality of ray source modules of the ray source are arranged in a plurality of different planes perpendicular to the conveying direction of the object to be detected.

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

[0056] According to some embodiments, the ray source module located on the opening side of the non-enclosed structure of the detector and the multiple detector groups of the detector are fixed in the same plane perpendicular to the conveying direction of the object to be detected, and the other ray source modules of the ray source are fixed in other planes perpendicular to the conveying direction of the object to be detected.

[0057] According to some embodiments, other radiation source modules of the radiation source are fixed in other same planes perpendicular to the conveying direction of the detected object.

[0058] According to some embodiments, the plurality of ray source modules may be removed and installed independently of each other.

[0059] According to some embodiments, each of the multiple radiation source modules is a distributed multi-point source. When observed along the conveying direction of the detected object, the multiple 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 surrounding 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 ray source is observed from the conveying direction of the detected object in the shape of a right-angled rectangle, a rounded rectangle, a polygon or an elliptical structure opening on one side of the scanning area.

[0061] According to some embodiments, each of the plurality of 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 ray source module has a separate cavity for accommodating a respective ray generating device.

[0063] According to some embodiments, the cavity of each ray source module includes a separate vacuum cavity for accommodating a plurality of targets.

[0064] According to some embodiments, the spacing between target points in each ray source module is smaller than the spacing between target points at ends of adjacent ray source modules.

[0065] According to some embodiments, the individual cavity of each ray source module is provided with an installation and positioning structure, and the installation and positioning structure is used to install and position the ray source module and to rotate the ray source module to adjust the beam output angle of the ray beam.

[0066] According to some embodiments, each detector group is a detector array including a plurality of detector units, wherein the detector array includes a linear detector array, an arc detector array, or a combination of the two.

[0067] According to some embodiments, each detector group is a linear detector array, and the detector includes three linear detector arrays, which are respectively arranged on three sides of the scanning area to form a rectangular or square structure opened on one side of the scanning area.

[0068] According to some embodiments, each detector group is a linear detector array, the detector includes a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays are shorter than the first linear detector arrays, and the plurality of first linear detector arrays and the plurality of second linear detector arrays are alternately arranged around the scanning area to form a polygonal structure open on one side of the scanning area.

[0069] According to some embodiments, the detector groups of the detector are detachable and installable independently of each other.

[0070] According to some embodiments, the detector group of the detector is configured to move perpendicularly or parallel to the conveying direction of the detected object for removal and installation.

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

[0072] According to some embodiments, when viewed from the conveying direction of the detected object, the detector is arranged between the radiation source and the scanning area; and along the conveying direction of the detected object, the other radiation 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 ray source modules is configured to avoid ray beams of the ray source modules on the same side and receive rays from all other ray source modules except the ray source modules on the same side.

[0074] According to some embodiments, each detector unit of the detector group includes a detector crystal for receiving rays transmitted through the detected object during scanning, and the detector crystal is arranged at the end of the detector unit along the conveying direction of the detected object, and the detector crystals of the detector group of the detector on the same side of the other ray source modules are arranged to be adjacent to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object, but do not block the ray beam.

[0075] According to some embodiments, other radiation source modules of the radiation source are arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystals of the detector group on the opposite side.

[0076] According to some embodiments, the other ray source modules are configured to rotate about the target axis so that the center position of the ray beam illuminates the detector crystals of the detector group on the opposite side.

[0077] According to some embodiments, the ray scanning device further includes an image processing module, which is configured to perform data compensation and / or reconstruct image repair for missing projection data at the end of the ray source module to obtain a complete reconstructed image.

[0078] According to some embodiments, the image processing module is configured to perform image reconstruction by an iterative method, an image threshold restoration method, or a combination of both.

[0079] An embodiment of the present application provides an installation and positioning structure of a radiation source of a radiation scanning device, the radiation scanning device comprising a radiation source and a fixedly arranged support frame, the installation and positioning structure comprising a main body, the main body being capable of being fixedly connected to the radiation source and the support frame, so that the radiation source can be fixedly mounted on the support frame through the main body, the installation and positioning structure also comprising: a moving device, by which the radiation source can be moved to a predetermined installation position on a first plane; a first positioning device, which is used to position the radiation source on the first plane; a lifting device, which is used to adjust 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, which is used to fix the position of the radiation source in the first direction.

[0080] By using the installation and positioning structure according to the above embodiment, each ray source module of the ray source can be removed and installed separately, and the beam output angle of the ray source module can also be adjusted.

[0081] According to some embodiments, the moving device includes rollers disposed at both ends of the ray source along the length direction.

[0082] According to some embodiments, the first positioning device includes a first positioning pin and a first pin hole provided on the main body and the supporting frame and corresponding to the first positioning pin.

[0083] According to some embodiments, the lifting device is arranged at two ends of the ray source along the length direction, 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 screw.

[0084] According to some embodiments, the second positioning device is formed as a positioning block, and the positioning block is placed under the main body after the radiation source is adjusted to a predetermined position along the first direction by the lifting device.

[0085] According to some embodiments, the installation and positioning structure further includes: an adjustment device, which is used to rotate the ray source along a predetermined axis to adjust the beam output angle of the ray source.

[0086] According to some embodiments, a mounting axis is provided on the radiation source, a corresponding axial hole is provided on the main body, and the main body is mounted on the mounting axis of the radiation source through the axial hole; the positioning and mounting structure also includes a positioning piece and a fastener, the main body is positioned relative to the radiation source through the positioning piece and the cooperation between the axial hole and the mounting axis, and is fixedly connected to the radiation source through the fastener; the adjusting device includes a rotation driving device, which can drive the radiation source to rotate around the mounting axis when the positioning piece and the fastener are loosened.

[0087] According to some embodiments, the rotation drive device includes an adjustment block fixed on the radiation source and a top screw arranged on the main body and abutting against the adjustment block, and the top screw can be rotated to push the adjustment block to move so as to rotate the radiation source.

[0088] According to some embodiments, the positioning member includes a second positioning pin and a corresponding second pin hole formed on the main body and the radiation source, and the fastener includes a fixing bolt and a corresponding threaded hole formed on the main body and the radiation source.

[0089] According to some embodiments, a ray scanning device is further provided, which includes a ray source and a fixed support frame, wherein the ray source is fixedly mounted on the support frame via the mounting and positioning structure described in any of the above embodiments.

[0090] According to some embodiments, the ray scanning device rotates the ray source through the installation and positioning structure to adjust the beam output angle of the ray source.

[0091] An embodiment of the present application also provides a mounting and fixing structure for a detector of a ray scanning device, the ray scanning device comprising the detector and a fixed support frame, the detector comprising one or more detector groups, the detector groups being fixedly mounted on or removed from the support frame via the mounting and fixing structure, the mounting and fixing structure comprising: a first mounting portion, which is fixedly mounted on the detector group; a second mounting portion, which is fixedly mounted on the support frame and capable of linearly moving with the first mounting portion, the detector group being capable of moving along the second mounting portion to a predetermined mounting position when the first mounting portion and the second mounting portion cooperate with each other; and a fixing device, which is arranged on one side of the detector group along the width direction, for fixing the detector group relative to a mounting reference surface on the support frame.

[0092] By using the installation and fixing structure according to the above embodiment, each detector group of the detector can be disassembled and installed separately, and can be disassembled and maintained without disassembling the ray source module when arranged inside the ray source module, thereby improving the convenience of disassembly and maintenance of the detector group.

[0093] According to some embodiments, the second mounting portion is further configured to support the detector group at the predetermined mounting position in a state of cooperation with the first mounting portion.

[0094] According to some embodiments, the first mounting portion includes a slider extending along the length direction of the detector group, and the second mounting portion includes a fixed guide rail matched with the slider.

[0095] According to some embodiments, the fixing device includes a fastener and a positioning member arranged on the supporting frame, the end surface of the positioning member away from the supporting frame is formed as the installation reference surface, which is used to abut against the surface of the one side of the detector group along the width direction, and the fastener passes through the positioning member and fastens the detector group relative to the end surface of the positioning member.

[0096] According to some embodiments, the slider is arranged on two opposite sides of the detector group in the width direction, and has an inner extension portion extending inward from the edges of the two opposite sides of the detector group in the width direction; the fixed guide rail includes an outer extension portion extending outward on two opposite sides in the width direction; when the first mounting portion is coordinated with the second mounting portion, the inner extension portion of the slider is located above the outer extension portion of the fixed guide rail and the two are in contact and overlapping arrangement to suspend the detector group on the fixed guide rail.

[0097] According to some embodiments, the fixed rail supports the slider below the slider.

[0098] According to some embodiments, the first mounting portion is formed as a slide groove extending along the width direction of the detector group, and the second mounting portion is formed as a slide rod matched with the slide groove.

[0099] According to some embodiments, a convex portion is formed at one end of the slide bar close to the support frame, and a surface of the convex portion facing the detector group is formed as the installation reference surface for abutting against a surface of the detector group on the other side along the width direction.

[0100] According to some embodiments, the fixing device is provided at the other end of the sliding rod opposite to the convex portion, and is arranged to abut against both sides of the width direction of the detector group with the convex portion respectively.

[0101] According to some embodiments, the fixing device includes a positioning sleeve and a fastener, wherein the positioning sleeve is mounted on the other end of the sliding rod and abuts against the one side of the detector along the width direction, and the fastener is used to fix the positioning sleeve to the other end of the sliding rod.

[0102] According to some embodiments, the second mounting portion includes two sliding bars, and the first mounting portion includes two sliding grooves formed at both ends of the detector group along the length direction, and the two sliding bars and the two sliding grooves respectively cooperate with each other to place the detector group at the predetermined mounting position.

[0103] According to some embodiments, the first mounting portion is formed as a fixed block fixed on the one side of the detector group along the width direction, and the fixed block has an opening on one side facing the thickness direction of the detector group; the second mounting portion is formed as a cantilever portion fixed on the supporting frame, and an extension portion is provided on the end of the cantilever portion away from the supporting frame, and the extension portion can cooperate with the opening of the fixed block in a linear movement.

[0104] According to some embodiments, the fixing device includes a fixing member and a fastener arranged on the supporting frame, the end surface of the fixing member away from the supporting frame is formed as the mounting reference surface, which is used to abut against the surface of the one side of the detector group along the width direction, and the fastener is used to fasten the detector group relative to the end surface of the fixing member.

[0105] According to some embodiments, when the first mounting portion is engaged with the second mounting portion, the cantilever portion supports the detector group at the predetermined mounting position via the fixing block.

[0106] According to some embodiments, a ray scanning device is also provided, which includes a detector and a fixed support frame, wherein the detector includes one or more detector groups, and the detector groups are installed and fixed to the support frame or removed from the support frame through the installation and fixing structure described in any of the above embodiments.

[0107] According to some embodiments, the width direction of the detector group is parallel to the conveying direction of the detected object, and the length direction and thickness direction of the detector group are perpendicular to the conveying direction of the detected object, and the conveying direction of the detected object is the direction in which the detected object is conveyed through the scanning area of ​​the X-ray scanning device.

[0108] According to some embodiments, when the detector includes a plurality of detector groups, a mounting reference surface for each of the plurality of detector groups is located in a same plane perpendicular to a conveying direction of the detected object.

[0109] According to some embodiments, a direction in which the first mounting portion moves linearly relative to the second mounting portion is parallel or perpendicular to a conveying direction of the detected object.

[0110] Other features and technical advantages of the present application will become more apparent from the following detailed description with reference to the accompanying drawings and other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0111] Figure 1 is a schematic structural diagram of a ray scanning device according to some embodiments of the present application;

[0112] Figure 2According to some embodiments of the present application Figure 1 A schematic diagram of the specific structure of the radiation source and detector of the radiation scanning device shown;

[0113] Figure 3 is a schematic diagram of a ray beam shape of a ray source according to some embodiments of the present application;

[0114] Figure 4 is a schematic diagram of ray source distribution in the form of target points according to some embodiments of the present application;

[0115] Figure 5 is a schematic diagram of an installation and positioning structure of a ray source module according to some specific embodiments;

[0116] Figure 6 is a schematic diagram of the distribution of detectors according to some embodiments;

[0117] Figure 7 is a schematic diagram of the structure of a linear detector group according to some embodiments;

[0118] Figure 8 is a schematic diagram of the structure of a detector unit according to some embodiments;

[0119] Fig. 9 is a schematic diagram of the installation and fixing structure of a detector group according to some embodiments;

[0120] Fig.10 is a schematic diagram of the corresponding relationship between a ray source module and a detector group receiving the ray thereof according to some embodiments;

[0121] Fig.11 According to some embodiments Figure 1 A schematic cross-sectional structure diagram of the ray scanning device shown along the center line of the conveying direction of the object to be detected;

[0122] Fig.12 is a schematic top view of the layout of detectors and radiation sources according to some embodiments;

[0123] Fig.13 is a schematic diagram of a combination of a detector and a radiation source according to some embodiments;

[0124] Fig.14 According to some embodiments Fig.13 A schematic diagram of the disassembly direction of the detector group in the combination of the detector and the radiation source shown;

[0125] Fig.15 is a mounting and fixing structure suitable for a detector group according to some embodiments;

[0126] Fig.16is a mounting and fixing structure suitable for a detector group according to other embodiments;

[0127] Fig.17 is a mounting and fixing structure suitable for a detector group according to still other embodiments;

[0128] Fig.18 is a schematic diagram of the arrangement of a radiation source and a detector of a radiation scanning device according to some embodiments;

[0129] Fig.19 is a three-dimensional schematic diagram of the layout of a radiation source and a detector of a radiation scanning device according to some embodiments;

[0130] Fig. 20 yes Fig.19 A side view of the arrangement of the radiation source and the detector of the radiation scanning device as viewed along the Z-axis direction;

[0131] Fig.21 yes Fig.19 A schematic top view of the layout of the radiation source and detector of the radiation scanning device shown;

[0132] Fig. 22 is a schematic diagram of the distribution of a single point source of a ray source of a ray scanning device according to some embodiments;

[0133] Fig.23 is a schematic diagram of the structure of a detector of a ray scanning device according to some embodiments; and

[0134] Fig.24 It is a schematic diagram of the disassembly and assembly direction of the detector according to some embodiments. DETAILED DESCRIPTION

[0135] In order to clearly describe the technical problems, technical solutions and beneficial effects to be solved by the present application, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the scope of the present application.

[0136] In order to solve the above-mentioned various technical problems, an embodiment of the present application provides a ray scanning device, which includes: a conveying device, which transports the object to be detected through a scanning area of ​​the ray scanning device; a ray source, which includes a plurality of ray source modules, each ray source module includes at least one ray source point for emitting a ray beam, and the plurality of ray source modules are arranged around the scanning area and fixed in a plane perpendicular to the conveying direction of the object to be detected; and a detector, which is used to detect rays transmitted through the object to be detected during scanning and includes a plurality of detector groups, the ends of the plurality of detector groups are interconnected to be arranged around the scanning area, and the plurality of detector groups are fixed in a plane perpendicular to the conveying direction of the object to be detected; wherein the detector is located between the ray source and the scanning area along a direction perpendicular to the conveying direction of the object to be detected, the ray source and the detector are arranged to at least partially overlap along the conveying direction of the object to be detected, and the plurality of ray source modules can be removed and installed independently of each other.

[0137] According to the ray scanning device of the embodiment of the present application, the ray source is formed by arranging a plurality of ray source modules around the scanning area, and the plurality of ray source modules can be disassembled and installed independently of each other, that is, each ray source module has a separate cavity to accommodate its own ray generating device. Compared with the integrated ray source surrounding the scanning area, the ray source formed by the combination of a plurality of ray source modules of the present application can reduce the outer shell size of a single ray source module and the volume of the internal vacuum cavity, so that a single ray source module is small in size and light in weight, thereby facilitating the disassembly and installation of the ray source; in addition, a plurality of target points of a single ray source module can use a separate vacuum cavity, thereby reducing the risk of ignition in the cavity when maintaining the ray source.

[0138] According to some embodiments of the present application, a separate cavity of each ray source module is provided with an installation positioning structure, and the installation positioning structure is used to fix the ray source module in a relative position in the ray scanning device, for example, to position the ray source module relative to the support frame, and also to rotate the ray source module around a predetermined axis to adjust the beam output angle of the ray beam. In addition, using the installation positioning structure, the position of each ray source module can be determined, thereby ensuring that the multiple ray source modules of the ray source are located in a plane perpendicular to the conveying direction of the detected object after installation (for example, in the same plane or in different planes).

[0139] Here, preferably, the ray source module can be a distributed multi-point source to form an annular structure around the scanning area, such as a rectangular ring, a polygonal ring or an elliptical ring. Specifically, the ray source module can be a linear distributed multi-point source, each ray source module can include multiple targets, and multiple ray source modules can be distributed on the upper side, lower side, left side and right side of the scanning area to form a rectangular ring around the scanning area. The ends of the ray source modules can be directly connected to form a continuous rectangular ring, or they can be separated by a certain gap to form a discontinuous rectangular ring. According to other embodiments, the ray source may further include a plurality of shorter straight-line distributed multi-point sources, which may be alternately arranged with a plurality of longer straight-line distributed multi-point sources, and the ends may be directly connected to form a continuous polygonal arrangement, or the ends may be arranged at intervals to form a non-continuous polygonal arrangement; or, the ray source may further include a plurality of shorter arc-shaped distributed multi-point sources, which may be alternately arranged with a plurality of longer straight-line distributed multi-point sources, and the ends may be directly connected to form a continuous rounded rectangular arrangement, or the ends may be arranged at intervals to form a non-continuous rounded rectangular arrangement; or, the ray source may also include ray source modules of other numbers, shapes and / or lengths to form other polygonal structures or elliptical structures, etc.

[0140] In addition, each ray source module of the ray source can also be a single point source group, each single point source group includes at least two single point sources. Preferably, multiple single point source groups of the ray source are distributed at the bottom viewing angle, left and right side viewing angles, top viewing angle and corner oblique viewing angle surrounding the scanning area to form a multi-viewing angle arrangement.

[0141] In addition, according to other embodiments, the ray source module may also be arranged around the scanning area on only three sides, for example, the upper side, the left side and the right side, the upper and lower sides and the left side or the right side, etc. (Here, it should be noted that in this article, the upper side, the lower side, the left side and the right side of the scanning area refer to the upper side, the lower side, the left side and the right side when the scanning area is observed along the conveying direction of the detected object). Thus, the ray source can be arranged into a non-enclosed structure with an opening on one side around the scanning area, such as a rectangular structure, a polygonal structure or an elliptical structure with an opening on one side, and more specifically, it can be a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon or a discontinuous rounded rectangle structure, and other polygonal and elliptical structures with an opening on one side around the scanning area. In the case where the ray source is composed of a single point source, correspondingly, the single point source may not be set on one side of the scanning area.

[0142] In the ray scanning device of the present application, the detector is a structure surrounding the scanning area formed by connecting the ends of multiple detector groups to each other. Preferably, in conjunction with the above-mentioned arrangement of various ray sources, such as a structure surrounding the scanning area on the four sides of the upper, lower, left and right, or a non-enclosed structure opened on one side of the scanning area, such as a rectangular structure, polygonal structure or elliptical structure opened on one side of the scanning area (more specifically, such as a continuous or discontinuous rectangular structure, a continuous or discontinuous polygonal structure, a continuous or discontinuous rounded rectangular structure and a single point source multi-viewing angle arrangement opened on one side of the scanning area), the multiple detector groups of the detector are arranged into a closed rectangular structure, square structure, polygonal structure or elliptical structure surrounding the scanning area. Specifically, each detector group of the detector may include a plurality of detector units and a detector arm, and the plurality of detector units are arranged in a straight line on the detector arm. The detector may include four detector groups arranged on the four sides of the upper, lower, left and right of the scanning area, respectively, to form a closed rectangular structure or square structure surrounding the scanning area. The detector may also include a plurality of longer detector groups and a plurality of shorter detector groups to form a closed polygonal structure surrounding the scanning area. Alternatively, according to other embodiments, in conjunction with the above-mentioned non-enclosed structure of the ray source that is open on one side of the scanning area, multiple detector groups of the detector can also be arranged into a non-enclosed structure that is open on one side of the scanning area, such as a rectangular structure, square structure, polygonal structure or elliptical structure that is open on one side.

[0143] According to some embodiments, the multiple detector groups of the detector are configured to be independently disassembled and installed. Thus, each detector group can be individually disassembled and installed, which facilitates the maintenance of the detector. In addition, the multiple detector groups of the detector can be configured to move along the conveying direction of the detected object for disassembly and assembly. Alternatively, in the case where the radiation source is arranged as a non-enclosed structure with an opening on one side around the scanning area, the multiple detector groups of the detector can be configured to move along the vertical direction of the conveying direction of the detected object for disassembly and assembly, and move along the conveying direction of the detected object for disassembly and assembly. Thus, even in the case where the detector is arranged on the inner side of the radiation source in the vertical direction of the conveying direction of the detected object, the detector group can be disassembled and maintained without disassembling the radiation source module, thereby improving the operational convenience of disassembly and assembly and maintenance of the detector.

[0144] In addition, according to some embodiments, the assembly and disassembly of the above-mentioned detector group can be completed with the help of linear movement cooperation between the detector arm of the detector group and its installation position in the radiation scanning device, such as the support frame of the radiation scanning device, such as linear sliding or linear rolling cooperation, etc. For example, it can be a slider guide cooperation set between the detector arm and the support frame, or a linear ball bearing and a cylindrical shaft cooperation, etc.

[0145] In addition, 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. In addition, as mentioned above, in the present application, each detector group is located in a plane perpendicular to the conveying direction of the detected object, and in particular, in the same plane, which specifically means that the detector crystals of each detector group are located in the same plane perpendicular to the conveying direction of the detected object. According to other embodiments, each detector group may also be located in different planes perpendicular to the conveying direction of the detected object.

[0146] In the ray scanning device according to the present application, the ray source of any embodiment described above is combined with the detector of any embodiment described above. In the combined state, each ray source module of the ray source is located in a plane (one or more planes) perpendicular to the conveying direction of the detected object, each detector group of the detector is located in other planes (especially the same plane) perpendicular to the conveying direction of the detected object, the detector is located on the inner side of the ray source in the vertical direction of the conveying direction, and the ray source and the detector are arranged to at least partially overlap in the conveying direction of the detected object. At least partial overlap of the ray source and the detector in the conveying direction of the detected object can reduce the arrangement length of the ray source and the detector, thereby facilitating the reduction of the length of the entire ray scanning system.

[0147] In some embodiments, each detector group of the detector is arranged so as not to block the ray beam of the ray source module on the same side, while being able to receive rays from each ray source module on the other sides, so that different ray source modules share the same detector group, which can reduce the total number of detectors.

[0148] In some embodiments, the detector crystals of each detector group of the detector are arranged at the end of the detector unit along the conveying direction of the detected object, and are arranged to be close to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object, but do not block the ray beam of the ray source module on the same side. In this way, the coverage length of the optical path between the ray source and the detector can be reduced as much as possible, thereby further reducing the length of the device.

[0149] In some embodiments, each ray source module is arranged so that the ray beam avoids the detector group on the same side and irradiates the detector crystals of the detector group on the opposite side. More specifically, the ray source module can be rotated relative to a predetermined axis, such as a target axis, etc. (for example, with the aid of the installation and positioning structure of the aforementioned ray source module) to adjust the beam output angle of the ray beam, so that the center position of the ray beam of the ray source module irradiates the detector crystals of the detector group on the opposite side. Since the detector crystals of the detector are located at the end position of the detector unit in the conveying direction of the detected object and are arranged close to the edge of the ray beam of the ray source on the same side, the ray source module only needs to rotate a small angle to make the center position of the ray beam irradiate the detector crystal, thereby minimizing the adverse effects of the ray beam obliquely incident on the detector crystal surface on imaging. The adjustment of the beam output angle of the ray source can also be achieved by setting the opening direction of the ray source module, adjusting the collimator, or other suitable methods.

[0150] According to some embodiments, the image processing module of the ray scanning device of the present application is configured to have a data compensation function, which can compensate for the missing data of the viewing angle and / or repair the reconstructed image to improve the 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 the two. Thus, the missing projection data caused by the increase in the target point spacing at the ends of adjacent ray source modules can be compensated, thereby improving the quality of the reconstructed image.

[0151] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0152] Figure 1 A ray scanning device according to some embodiments of the present application is schematically shown. Figure 1The ray scanning device shown includes a conveyor 1, a channel 2, a ray source 3, a detector 4 and a support frame 5. The conveyor 1 is used to transport the detected object 6 through the scanning area of ​​the ray scanning device, which is defined by the ray source 3 and the detector 4. Driven by the conveyor 1, the detected object 6 enters the channel 2 from the opening at one end of the channel 2 and leaves from the opening at the other end of the channel 2. The channel 2 can shield the rays of the ray source 3 from the external environment to avoid radiation damage to people near the device, and can also limit the volume of the detected object 6 entering the channel 2. The ray source 3 is fixed to the support frame 5 on the outside of the channel 2, which is used to emit a beam of rays to irradiate the detected object 6 during scanning. The detector 4 is also fixed to the support frame 5 on the outside of the channel 2, which is used to detect the rays transmitted through the detected object 6 during scanning. The support frame 5 is used to support and fix the conveyor 1, the channel 2, the ray source 3, the detector 4 and other devices, and is fixed relative to the ground. It should be noted that although the ray source 3 and the detector 4 are arranged outside the channel 2, the channel 2 is provided with an avoidance area in the scanning area, which will not block the ray beam of the ray source 3, nor prevent the detector 4 from receiving rays.

[0153] The ray scanning device according to the embodiment of the present application may further include a control device, which may control the operation of various components of the ray scanning device, such as controlling the emission of rays from the ray source 3, the data output of the detector 4, etc. The control device may further include an image processing module, which may perform image reconstruction based on the output information of the detector 4 to obtain a scanned image of the detected object 6.

[0154] The conveying device 1 may be, for example, a conveyor belt; the detected object 6 may be, for example, a package, luggage or other items that require safety inspection.

[0155] The ray source 3 may include a plurality of ray source modules, each of which is arranged around the scanning area and is located in a plane perpendicular to the conveying direction of the detected object 6. Each of the ray source modules may be arranged in the same plane perpendicular to the conveying direction of the detected object 6 or in different planes. This embodiment is described by taking the case where each of the ray source modules is located in the same plane perpendicular to the conveying direction of the detected object 6 (specifically, the ray openings of each of the ray source modules are located in the same plane perpendicular to the conveying direction of the detected object 6) as an example, but the same is applicable to the case where each of the ray source modules is located in different planes. Figure 1 The forward direction Z of the detected object 6 is shown in the figure. 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 XYZ coordinate system is shown in the figure, which can be used as a reference coordinate system to describe the positions of components in the ray scanning device. These position descriptions are for the purpose of clearly describing the principles of the present application and have no limiting effect. The forward direction Z of the object 6 to be detected is the same as the Z direction of the XYZ coordinate system.

[0156] According to some embodiments, each ray source module of the ray source 3 of the ray scanning device according to the embodiment of the present application can be a distributed multi-point source, and the multiple ray source modules can be arranged into a rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area, wherein part of the structure is located below the conveying device 1 to completely surround the conveying device 1.

[0157] Specifically, as a distributed multi-point source, each ray source module may have multiple target points, each target point of each ray source module may generate a ray beam independently, and each target point may generate a ray beam in a predetermined sequence under the control of the control device. The ray beam may be a fan-shaped beam with an opening angle A, such as Figure 3 Of course, the shape of the ray beam is not limited to the fan beam, and can also be a cone beam, parallel beam or other ray beams, which can be specifically set as needed.

[0158] The specific arrangement of the radiation source 3 is as follows. Figure 2 A schematic diagram of the structure of a ray source and a detector according to some embodiments is shown, wherein a plurality of ray source modules of the ray source 3 are arranged in a rectangular structure surrounding a scanning area. Specifically, the ray source 3 includes four ray source modules 31, 32, 33, 34, each of which is a linearly distributed multi-point source (i.e., a plurality of target points are arranged in a linear manner), and the four ray source modules 31, 32, 33, 34 are respectively arranged on the upper side, the lower side, the left side, and the right side of the scanning area, forming a rectangular structure surrounding the scanning area. The ends of the ray source modules 31, 32, 33, 34 are spaced a certain distance apart, thereby forming a non-continuous rectangular structure (e.g., Figure 4 As shown in (a), the targets are also arranged in non-continuous rectangles).

[0159] The arrangement of the radiation 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 ray source modules 31, 32, 33, and 34 may be directly connected so that the ray source 3 is arranged around the scanning area in a continuous rectangular structure (such as Figure 4 (b) shows that the target points are arranged in a continuous rectangle). In addition, the radiation source 3 can be Figure 2The embodiment shown in the figure further includes four linear distributed ray source modules 35, 36, 37, 38, which are shorter than the ray source modules 31, 32, 33, 34, and are arranged alternately with the ray source modules 31, 32, 33, 34 and are directly connected at their ends, so that the ray source 3 is arranged in a continuous polygonal structure (such as Figure 4 As shown in (c), the target points are arranged in a continuous polygon). In addition, the ray source modules 35, 36, 37, and 38 can be arc-shaped distributed ray sources, which are arranged alternately with the ray source modules 31, 32, 33, and 34 and the ends are directly connected, so that the ray source 3 is arranged in a continuous rounded rectangular structure. Of course, the ends of the ray source modules 31, 32, 33, 34, 35, 36, 37, and 38 can also be spaced a certain distance apart, so that the ray source 3 is arranged in a non-continuous polygonal structure or a non-continuous rounded rectangular structure (not shown in the drawings). In addition, the length of the ray source modules 35, 36, 37, and 38 can be the same as or longer than the length of the ray source modules 31, 32, 33, and 34, or the ray source 3 can include ray source modules of other numbers (multiple) and / or lengths, thereby forming a Figure 4 In addition, the ray source 3 may include ray source modules of other numbers (multiple), lengths and / or shapes, so as to form an elliptical structure.

[0160] In some embodiments, the ray source modules included in the ray source 3 are independently removable and installable, that is, each ray source module has a separate cavity for accommodating its own ray generating device. The fact that each ray source module has a separate cavity means that multiple target points of each ray source module share a single vacuum cavity. The spacing between multiple target points of each ray source module in the vacuum cavity can be determined by the number of target points and the length of the cavity. According to some embodiments, the number of target points in a single ray source module can be 192, 264, etc., and the target point spacing in a single ray source module can be 4 mm, 12 mm, etc. It should be noted here that the spacing between the target points at the ends of adjacent ray source modules is greater than the spacing between the target points in a single ray source module, even when the ends of adjacent ray source modules are directly connected, that is, when two separate cavities are directly connected. Each radiation source module has a separate cavity, which has the following advantages: compared with a radiation source with an integrated annular cavity (i.e., all target points of the radiation source are located in the same annular vacuum cavity), the outer shell size of a single radiation source module and the volume of the internal vacuum cavity can be reduced, so that the volume and weight of a single radiation source module are reduced, thereby facilitating the disassembly and installation of the radiation source; in addition, each radiation source module uses a separate vacuum cavity, which can reduce the risk of fire in the cavity when maintaining the radiation source module.

[0161] In addition, according to some embodiments, each ray source module of the ray source 3 is provided with an installation positioning structure to facilitate the installation and adjustment of the ray source module. With the help of the installation positioning structure, each ray source module of the ray source 3 can be installed and fixed at a predetermined position in the ray scanning device (for example, a specific position in the ray scanning device relative to the XYZ reference coordinate system), for example, to ensure that multiple ray source modules are located in the same plane perpendicular to the conveying direction of the detected object 6. In addition, with the help of the installation positioning structure, the ray source module can also be rotated to adjust the beam-out angle of the ray beam.

[0162] The various ray source modules of the ray source 3 can be installed in different ways and have different installation and positioning structures due to their different positions in the ray scanning device. For example, the ray source modules located above and to the side of the scanning area can be installed by hoisting through equipment such as an overhead crane. However, the ray source modules located below the scanning area are not suitable for hoisting and need to be installed in other ways. In order to facilitate the installation of such ray source modules, an embodiment of the present application provides an installation and positioning structure, which can easily install and fix the ray source modules that are not suitable for hoisting at a predetermined position of the ray scanning device, and can also rotate the ray source module to adjust the beam output angle of the ray beam. According to some embodiments, the installation and positioning structure includes a main body, which can be fixedly connected to the ray source module and the support frame of the ray scanning device, so that the ray source module can be fixedly installed to the support frame through the main body, wherein the installation and positioning structure includes: a moving device, through which the ray source module can be moved on a first plane (for example, Figure 1 The first positioning device positions the ray source module on the first plane; the lifting device is used to move the ray source module along the first direction (for example, the XZ plane in the first direction); Figure 1 A first positioning device is used to adjust the position of the ray source module according to a Y direction in the XZ plane, wherein the first direction is perpendicular to the first plane; and a second positioning device is used to fix the position of the ray source module in the first direction.

[0163] Figure 5 FIG. 2 shows a specific embodiment of the installation and positioning structure of the above-mentioned ray source module. Figure 5 As shown, the installation and positioning structure includes main bodies 11 and 12, which are respectively located at two ends of the ray source module along the length direction and are fixedly connected to the ray source module (here, the ray source module is Figure 2 The ray source module 33 of the ray source 3 in the embodiment is described as an example, and other suitable ray source modules may also be used. The ray source module 33 is fixedly mounted to the support frame 5 via the main body 11 and 12 (in Figure 5The moving device of the installation and positioning structure is specifically configured as rollers 13 and 14, which are respectively arranged on the main bodies 11 and 12. The ray source module 33 can be pushed by the rollers 13 and 14, so as to move to the predetermined installation position on the XZ plane. Of course, the moving device of the installation and positioning structure is not limited to rollers. According to other embodiments, the ray source module can also be moved in a sliding manner. For example, a linear sliding fit can be set between the installation and positioning structure and the support frame 5 to move the ray source module 33 to the predetermined installation position.

[0164] The first positioning device includes first positioning pins 15, 16 and corresponding first pin holes (not shown in the figure) respectively arranged on the main body 11, 12 and the support frame 5 of the X-ray scanning device. After the X-ray source module 33 is moved to the predetermined installation position via the rollers 13, 14, the first positioning pins 15, 16 are respectively inserted into the corresponding first pin holes to position the X-ray source module 33 on the XZ plane.

[0165] The lifting device includes a roller 13 arranged at the main body 11, wherein the roller 13 is specifically arranged as a liftable roller, and further includes a lifting screw 17 arranged on the main body 12, one end of the lifting screw 17 abuts against the support frame 5, and screwing the lifting screw 17 can make the main body 12 and the ray source module 33 rise or fall relative to the support frame 5. By adjusting the liftable roller 13 and the lifting screw 17, the position of the 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 the ray source module 33 is adjusted to a predetermined position along the Y direction by adjusting the liftable roller 13 and the lifting screw 17, the positioning pads 19 and 20 are placed below the main bodies 11 and 12 respectively, and the height of the ray source module 33 relative to the support frame 5 can be fixed, so that the ray source module 33 is positioned along the first direction Y. Here, in particular, the positioning pad 20 below the main body 12 can be set to a U-shape, and the lower part of the lifting screw 17 is located in the opening of the U-shaped positioning pad 20 to prevent the two from interfering with each other. In addition, the installation positioning structure can also include first fixing bolts 21, 22 and corresponding first threaded holes set in the main body 11, 12, the positioning pads 19, 20 and the support frame 5. The first fixing bolts 21, 22 are respectively inserted into the corresponding first threaded holes and tightened, so that the positioning pads 19, 20 can be fixed relative to the main body 11, 12 and the support frame 5, and the ray source module 33 can be fixedly connected to the support frame 5.

[0166] In addition, according to some embodiments, the installation and positioning structure further includes an adjustment device, which is used to rotate the ray source module along a predetermined axis to adjust its beam output angle. Figure 5In a specific embodiment, the ray source module 33 is provided with a mounting shaft 331, and shaft holes are respectively provided on the main bodies 11 and 12, and 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, and second pin holes corresponding to the second positioning pins 23 and 24 are respectively provided on the main bodies 11 and 12 and the ray source module 33. By fitting the shaft holes of the main bodies 11 and 12 on 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 ray source module 33. In addition, the mounting and positioning structure also includes second fixing bolts 25 and 26 for fixing the main bodies 11 and 12 relative to the ray source module 33, and corresponding second threaded holes provided on the main bodies 11 and 12 and the 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 ray source module 33. By pulling out the second positioning pins 23 and 24 and loosening the second fixing bolts 25 and 26 , the main bodies 11 and 12 can be loosened relative to the radiation source module 33 . In this state, the adjustment device can drive the radiation source module 33 to rotate relative to the main bodies 11 and 12 around the mounting axis 331 .

[0167] In a specific embodiment, the adjusting device includes a rotation driving mechanism, which includes an adjusting block 27 fixed on the ray source module 33 and a top screw 28 arranged on the main body 11 and abutting against the adjusting block 27, and the top screw 28 can be screwed to push the adjusting block 27 to move so that the ray source module 33 rotates. Here, the rotation driving mechanism is only arranged on one main body of the installation and positioning structure, that is, only arranged at one end of the ray source module 33 along the length direction. Since both ends of the ray source module 33 are supported by the installation shaft 331, the ray source module 33 is pushed to rotate at one end of the ray source module 33, and the ray source module 33 as a whole can rotate accordingly. After the ray source module 33 is rotated through a predetermined angle, the second positioning pins 23 and 24 are inserted into the corresponding second pin holes again, and the second fixing bolts 25 and 26 are screwed into the corresponding second threaded holes again, so that the main bodies 11 and 12 can be fixedly connected relative to the ray source module 33.

[0168] In the above embodiment, the installation axis 331 on the ray source module 33 can coincide with the virtual connecting line of multiple target points in the ray source module 33 . Therefore, rotating the ray source module 33 around the installation axis 331 can cause the ray source module 33 to rotate around the target axis.

[0169] In addition, although Figure 2 The installation and positioning structure according to the above embodiment is described by taking the ray source module 33 of the ray source 3 as an example, but the above installation and positioning structure can be applied to the installation, positioning and adjustment of the ray source of any suitable ray scanning device. Of course, Figure 2The installation, positioning and adjustment of the ray source module 33 of the ray source 3 in the embodiment are not limited to the installation and positioning structure of the above embodiment, and any other suitable structure may be adopted. Figure 5 In the embodiment shown, the lifting device is implemented by a lifting roller 13 and a lifting screw 17, but the lifting device is not limited to the specific structure of this embodiment, and can also be implemented as other suitable structures, such as using lifting screws on both bodies for lifting. Similarly, the specific implementation of the moving device, the first positioning device, the second positioning device and the adjusting device is not limited to the specific structure in the above embodiment, and other suitable structures can be used as long as their functions can be achieved.

[0170] In the above embodiment, Figure 1 The ray source module of the ray source 3 of the ray scanning device shown is a distributed ray source, but alternatively, the ray source 3 can also be composed of a plurality of single point source groups, wherein each single point source group includes at least two single point sources. Each single point source can emit a ray beam individually, for example, a fan-shaped beam with an opening angle A (such as Figure 3 Each single point source of the ray source 3 can emit rays in a predetermined time sequence under the control of the control device of the ray scanning system. Figure 4 (d) shows a layout of ray sources including a plurality of single point source groups according to some embodiments. Figure 4 As shown in (d), the ray source includes a plurality of single point source groups arranged around the scanning area at the bottom viewing angle, the left viewing angle, the right viewing angle, the top viewing angle and the corner oblique viewing angle, wherein: the bottom viewing angle single point source group includes 3 single point sources, which are arranged at the left bottom viewing angle, the middle bottom viewing angle and the right bottom viewing angle respectively; the top viewing angle single point source group includes 3 single point sources, which are arranged at the left top viewing angle, the middle top viewing angle and the right top viewing angle respectively; the left viewing angle single point source group includes 2 single point sources, which are arranged at the upper left side viewing angle and the lower left side viewing angle respectively; the right viewing angle single point source group includes 2 single point sources, which are arranged at the upper right side viewing angle and the lower right side viewing angle respectively; the corner oblique viewing angle single point source group includes 4 single point sources, which are arranged at the upper left oblique viewing angle, the upper right oblique viewing angle, the lower left oblique viewing angle and the lower right oblique viewing angle respectively. According to other embodiments, each single point source group may further include more single point sources. Similarly, each single point source may include its own mounting and positioning structure to mount and position the single point source, thereby ensuring that the multiple single point sources are located in the same plane perpendicular to the conveying direction of the detected object 6. The mounting and positioning structure can also be used to rotate the single point source to adjust the beam angle of the rays of each single point source.

[0171] The following describes the Figure 1Arrangement of the detector 4 of the X-ray scanning device shown. The detector 4 may include a plurality of detector groups, the plurality of detector groups are located in a plane perpendicular to the conveying direction of the detected object 6, and the ends of the respective detector groups are interconnected to be arranged around the scanning area. The plurality of detector groups may be located in the same plane or in different planes perpendicular to the conveying direction of the detected object 6, and are preferably arranged in the same plane. This embodiment is described as being located in the same plane, but is also applicable to the case of being located in different planes. Specifically, each detector group of the detector 4 is a detector array including a plurality of detector units, and the plurality of detector groups may be arranged into a closed square structure, a rectangular structure, a polygonal structure or an elliptical structure surrounding the scanning area, wherein a portion of the structure is located below the conveying device 1 to completely surround the conveying device 1.

[0172] Figure 2 4 shows the arrangement of detectors according to some embodiments, wherein the detector 4 includes four detector groups 41, 42, 43, 44, each of which is a linear detector array including a plurality of detector units arranged along a straight line. The four detector groups 41, 42, 43, 44 are arranged at the upper, lower, left, and right sides of the scanning area and the ends are connected to each other to form a closed rectangular structure (such as Figure 6 (a) or a square structure. The arrangement of the detector 4 is not limited to Figure 2 and Figure 6 The embodiment shown in (a) of FIG. 1 may be alternatively arranged in other structures. For example, the detector 4 may include four longer linear detector arrays and four shorter linear detector arrays, which are alternately arranged around the scanning area and connected at their ends to form a closed polygonal structure (such as Figure 6 (b)). The detector 4 may include other numbers of multiple longer linear detector arrays and other numbers of multiple shorter linear detector arrays, which are alternately arranged around the scanning area and connected at their ends to form other closed polygonal structures. The detector 4 may also include other numbers, lengths and / or shapes of detector groups to form closed structures of other shapes, such as elliptical structures.

[0173] The detector group in the form of a linear detector array may adopt any suitable structure, and according to some embodiments, its specific structure may be as follows: Figure 7 As shown. Figure 7 As shown, the detector group includes a plurality of detector units 45 and a detector arm 46. The plurality of detector units 45 are arranged side by side along a straight line on the detector arm 46. The specific structure of the detector unit 45 can be as follows: Figure 8 As shown, other suitable structures can also be used. Figure 8As shown, the detector unit 45 includes a detector crystal 451 for receiving radiation. A plurality of detector units 45 are arranged side by side on the detector arm 46 with the detector crystals 451 facing the same direction. The structure of the detector arm 46 is not limited to Figure 7 The embodiment shown in the figure may also adopt other suitable structures (hereinafter referred to as Fig. 9 , Figure 15-17 The detector arm structure shown in FIG. 1 ). The detector group of the present application is not limited to the form of a linear detector array, but may also be in the form of an arc detector array to form an elliptical detector. The arc detector array may include a plurality of arc detector units and an arc detector arm, wherein the plurality of arc detector units are arranged side by side on the arc detector arm, wherein the detector crystals of the detector units face the same direction.

[0174] According to some embodiments, each detector group of the detector 4 can be independently disassembled and installed, thereby improving the maintainability of the detector. In addition, in particular, the multiple detector groups of the detector 4 are configured to be disassembled, installed and adjusted along the conveying direction of the detected object 6, so that when the detector 4 is arranged inside the radiation source 3 along a direction perpendicular to the conveying direction of the detected object 6, the detector group can be disassembled, installed, adjusted and maintained without disassembling the radiation source, further improving the maintainability of the detector.

[0175] Specifically, with the aid of the mounting and fixing structure of the detector group of the present application, the detector group of the detector 4 can be moved relative to its mounting position in the X-ray scanning device (for example, the support frame 5) along the conveying direction of the detected object 6 to be removed from or installed to the mounting position.

[0176] The following is a detailed description of the mounting and fixing structure for the detector group according to some embodiments of the present application. The mounting and fixing structure of the detector group according to some embodiments of the present application specifically includes a first mounting portion, which is fixedly arranged on the detector group; a second mounting portion, which is fixedly arranged on the support frame of the ray scanning device and cooperates with the first mounting portion for linear movement, wherein the detector group can be moved along the second mounting portion to a predetermined mounting position when the first mounting portion and the second mounting portion cooperate with each other; and a fixing device, which is arranged on one side of the detector group along the width direction, and is used to fix the detector group relative to the mounting reference surface on the support frame. In some specific embodiments, the detector group is mounted and fixed to the support frame of the ray scanning device via a detector arm, wherein the first mounting portion is fixedly arranged on the detector arm of the detector group, and the fixing device is arranged on one side of the detector arm along the width direction, and the detector arm is fixed to the support frame to fix the detector group.

[0177] Fig. 9The mounting and fixing structure of the detector group according to some specific embodiments is shown, wherein Figure (a) shows a decomposed stereoscopic 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 mounting and fixing state of the detector group. Fig. 9 The complete detector set is not shown in the figure, only the detector arm is shown, wherein a plurality of detector units can be arranged side by side along the length direction on the shown detector arm to form a complete detector set.

[0178] like Fig. 9 As shown, the first mounting portion of the mounting and fixing structure of the detector group is specifically formed as a slide groove 471 extending in the width direction of the detector arm 47, wherein the width direction of the detector arm 47 is consistent with the conveying direction of the detected object 6 when it is mounted on the support frame 5 of the ray scanning device. The second mounting portion is formed as a slide bar 472 that matches the slide groove 471. The slide groove 471 is formed as a semicircular open slide groove, and the slide bar 472 is correspondingly formed as a cylindrical slide bar. The slide bar 472 is fixedly arranged on the support frame 5, or is formed integrally with the support frame 5, and its length direction is consistent with the conveying direction of the detected object 6. One end of the slide bar 472 close to the support frame 5 is set to be larger in size relative to the rest of the slide bar 472 to form a convex portion 473. The end surface of the convex portion 473 facing the detector arm 47 is formed as a mounting reference surface 474, which is used to abut against a surface 475 on one side of the detector arm 47 along the width direction. The surface 475 is the mounting surface of the detector arm 475, and both the surface 475 and the mounting reference surface 474 are processed to have good flatness. When the mounting surface 475 of the detector group is positioned against the mounting reference surface 474, the detector group can be accurately positioned in the width direction, that is, in the conveying direction of the detected object 6. The protrusion 473 can also be used as a limiting portion. When installing the detector group, the slide groove 471 is aligned with the slide bar 472 and the detector arm 47 is pushed toward the support frame 5 along the slide bar 472 until the detector arm 47 abuts against the protrusion 473, so that the detector arm 47 can be moved to a predetermined installation position.

[0179] The fixing device is provided at the other end of the slide bar 472 opposite to the protrusion 473, and is arranged to abut against the two sides of the detector arm 471 along the width direction with the protrusion 473, so as to define 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 bar 472 opposite to the protrusion 473 and abuts against the surface 478 of the other side of the detector arm 47 along the width direction, and the fastener 477 fixes the positioning sleeve 476 to the other end of the slide bar 472 opposite to the protrusion 473. Specifically, the fastener 477 can be a fastening screw, and the positioning sleeve 476 and the other end of the slide bar 472 are both provided with threaded holes. The positioning sleeve 476 is fastened relative to the slide bar 472 by screwing the fastening screw into the threaded hole, so as to fix the detector arm 47 relative to the slide bar 472 (i.e., the support frame 5) in the width direction. At the same time, since the shape matching between the slide rod 472 and the slide groove 471 limits other degrees of freedom, the detector arm 47 can be completely positioned and fixed.

[0180] Through the above-mentioned installation and fixing structure, when installing the detector group, in the state where the detector unit faces the scanning area and the width direction is consistent with the conveying direction of the detected object 6, first align the slide groove 471 of the detector arm 47 with the slide bar 472, so that the detector arm 47 moves along the slide bar 472 until it abuts against the convex portion 473; then, the positioning sleeve 476 is sleeved on the end of the slide bar 472 opposite to the convex portion 473, and is fixed relative to the slide bar 472 with a screw, thereby fixing the detector arm 47. When disassembling the detector group, the opposite operation can be performed.

[0181] Through the above-mentioned installation and fixing structure, since the slide bar 472 extends along the conveying direction of the detected object 6, that is, the linear movement between the detector group and the support frame 5 is coordinated along the conveying direction of the detected object, and the fixing device is arranged on one side of the detector group along the width direction, and the width direction of the detector group is consistent with the conveying direction of the detected object 6. Therefore, with the help of the above-mentioned installation and fixing structure, the detector group can be moved along the conveying direction of the detected object 6 for installation or removal, and the fastening operation can also be performed on one side of the detector group along the conveying direction of the detected object. Therefore, the detector can be disassembled or maintained from the side along the conveying direction of the detected object. Even in the case where the detector is arranged on the inner side of the radiation source perpendicular to the conveying direction, its disassembly or maintenance can avoid the obstruction of the radiation source and can be performed without disassembling the radiation source, thereby improving the convenience of disassembly and maintenance of the detector.

[0182] In addition, preferably, the second mounting portion of the above-mentioned mounting and fixing structure is configured to support the detector group at a predetermined mounting position in a state of matching with the first mounting portion. Specifically, the second mounting portion includes two slide bars 472, and two slide grooves 471 are correspondingly formed on the detector arm 47, which are arranged at both ends of the detector arm 47 along the length direction, so that after the detector arm 47 moves to the predetermined mounting position on the two slide bars 472, the two slide bars 472 can support the detector group at the predetermined mounting position without the need for other auxiliary structures and / or tools. In this way, when the detector group is tightened, no additional tools are required and the operator does not need to support the detector group to operate, thereby improving the convenience of operation.

[0183] Although in Fig. 9 The middle detector arm is shown in a vertical direction, but the above-mentioned installation and fixing structure is not limited to being used only for the installation and removal of the detector group arranged vertically in the ray scanning device, and the detector groups arranged in other directions can also use the above-mentioned installation and fixing structure.

[0184] Of course, the mounting and fixing structure between the detector group and the support frame 5 is not limited to Fig. 9 The illustrated embodiment may also adopt other suitable mounting and fixing structures. For example, according to some embodiments, the linear moving fit of the mounting and fixing structure may be other suitable fits, such as a linear rolling 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 semicircle, but may be a semi-rectangular shape or the like. Accordingly, the slide rod 472 is not limited to a cylinder, but may be a prism or the like that matches the slide groove 471.

[0185] In addition, when the detector includes multiple detector groups, the installation reference surfaces of each of the multiple detector groups are set in the same plane perpendicular to the conveying direction of the detected object 6, which can ensure that the multiple detector groups are in the same plane perpendicular to the conveying direction of the detected object 6 after installation. Fig. 9 The mounting and fixing structure shown is used for installation, so that the end surface of the protrusion 473 corresponding to 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 6 to be detected, and the mounting surfaces 475 of each detector group along the width direction are all fixed against their respective mounting reference surfaces 474. After the multiple detector groups are installed in place, they must be located in the same plane perpendicular to the conveying direction of the object 6 to be detected.

[0186] The following further describes the relative arrangement of the ray source 3 and the detector 4 of the ray scanning device according to the embodiment of the present application. As described above, the ray source 3 includes a plurality of ray source modules, each of which is arranged around a scanning area and is located in the same plane perpendicular to the conveying direction of the detected object 6; the detector 4 includes a plurality of detector groups, each of which is located in the same plane perpendicular to the conveying direction of the detected object 6, and the ends of each detector group are interconnected to be arranged around the scanning area. Further, in the combined state of the ray source 3 and the detector 4, the detector 4 is arranged on the inner side of the ray source 3 in a direction perpendicular to the conveying direction of the detected object 6, and the ray source 3 and the detector 4 are arranged to at least partially overlap in the conveying direction of the detected object 6, wherein the plurality of ray source modules of the ray source 3 can be arranged into a rectangular structure, a polygonal structure, an elliptical structure, etc., as in the structure of any of the embodiments described above, and the plurality of detector groups of the detector 4 are arranged into a square structure, a rectangular structure, a polygonal structure, an elliptical structure, etc., as in the structure of any of the embodiments described above. The following describes the relative arrangement of the ray source 3 and the detector 4 in the embodiment of the present application. Figure 2 The embodiment shown in the figure is used as an example to describe the detailed arrangement of the radiation source 3 and the detector 4 in the combined state. Figure 2 In the embodiment, the four linear distributed ray source modules 31, 32, 33, 34 of the ray source 3 are arranged in a non-continuous rectangular structure, and the four linear detector arrays 41, 42, 43, 44 of the detector 4 are arranged in a closed rectangular structure. Figure 2 The detailed arrangement in the combined state described as an example is also applicable to any other structural combination of the radiation source 3 and the detector 4 .

[0187] Preferably, the detector groups 41, 42, 43, 44 of the detector 4 are arranged so as not to block the ray beam of the ray source module on the same side, and at the same time can receive the rays from the ray source modules on the other sides. Since the ray source 3 and the detector 4 are both arranged in a ring shape, the same detector group can be shared by different ray source modules of the ray source. Fig.10 FIG. 1 shows the corresponding relationship between each ray source module and the detector group receiving the ray, wherein the ray beams of each target point of each ray source module 31, 32, 33, 34 of the ray source 3 are fan-shaped beams (such as Figure 3 Taking the ray beam with an opening angle A as shown in FIG. 1 as an example, the ray beam emitted by each ray source module 31, 32, 33, and 34 can be detected by the three-side detector groups of the detector 4, and the detector groups and parts thereof that can receive the rays are represented by thick solid lines. Fig.10 (a) shows the detector group and its part corresponding to the ray beam of the ray source module 31 above the scanning area, wherein the detector groups 42, 43, 44 of the detector 4 receive the ray beam from the ray source module 31; Fig.10(b) shows the detector group and its part corresponding to the ray beam of the ray source module 32 on the right side of the scanning area, wherein the detector groups 41, 43, 44 of the detector 4 receive the ray beam from the ray source module 32; Fig.10 (c) shows the detector group and its part corresponding to the ray beam of the ray source module 33 at the lower side of the scanning area, wherein the detector groups 41, 42, 44 of the detector 4 receive the ray beam from the ray source module 33; Fig.10 (d) shows the detector group and its part corresponding to the ray beam of the ray source module 34 on the left side of the scanning area, wherein the detector groups 41, 42, 43 of the detector 4 receive the ray beam from the ray source module 34. Fig.10 It can be seen that the rays of a ray source module can be received by the detector groups on other sides except the detector group on the same side, and different ray source modules can share the same detector group, for example, ray source modules 31 and 32 share detector groups 43 and 44, ray source modules 32 and 33 share detector groups 41 and 44, and ray source modules 33 and 34 share detector groups 41 and 42, etc. In addition, in addition to being detected by the detector group on the opposite side, the rays of each ray source module can also be received by the detector groups on other sides except the detector on the same side, so the rays of each ray source module can be detected by the detector as much as possible. Therefore, the detector of the present application can reduce the number of detector groups and reduce equipment costs while improving image quality.

[0188] In addition, preferably, the detector crystals of each detector group of the detector 4 are arranged at the end of the detector unit along the conveying direction of the detected object 6, and are arranged to be close to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object 6, but do not block the ray beam of the ray source module on the same side. In this way, the coverage length of the optical path between the ray source and the detector can be reduced as much as possible, thereby reducing the length of the device. Specifically, as shown in 11 and Fig.12 shown. Fig.11 According to some embodiments Figure 1 The cross-sectional structure diagram of the ray scanning device shown in FIG. Fig.11 As shown, the detector unit may be, for example, Figure 7 The detector unit 45 shown, the detector crystal may be, for example, Figure 7 The detector crystal 451 shown in the figure; the surface of the detector crystal 451 is arranged parallel to the conveying direction of the detected object 6, and is located at the end of the detector unit 45 along the conveying direction of the detected object 6. At the same time, other components of the detector group, 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, and avoid the beam exit of the radiation source on the same side. In addition, Fig.12A schematic top view of the layout of detectors and radiation sources according to some embodiments is shown, in which the radiation source modules on the left and right sides are radiation source modules 34 and 32 of radiation source 3, and the detector crystals 451-4 and 451-2 on the left and right sides represent the positions of the detector crystals 44 and 42 of the detector group, respectively. Fig.12 It can be seen that the detector crystal 451-4 is arranged close to the edge of the ray beam of the ray source module 34 on the same side in the conveying direction of the detected object 6, and does not block the ray beam of the ray source module 34 on the same side; the detector crystal 451-2 is arranged close to the edge of the ray beam of the ray source module 32 on the same side in the conveying direction of the detected object 6, and does not block the ray beam of the ray source module 32 on the same side. With the above configuration, the ray source 3 and the detector 4 can overlap to the greatest extent in the conveying direction of the detected object 6, so that the coverage length of the optical path between the ray source and the detector can be reduced as much as possible, thereby reducing the length of the device.

[0189] More specifically, each radiation source module of the radiation source 3 is arranged so that the radiation beam avoids the detector group on the same side and irradiates the detector crystals of the detector group on the opposite side. Fig.12 As shown, the ray beam of the ray source module 34 can cover and illuminate the detector crystal 451-2 of the detector group 42 on the opposite side while avoiding the detector group 44 on the same side, and the ray beam of the ray source module 32 can cover and illuminate the detector crystal 451-4 of the detector group 44 on the opposite side while avoiding the detector group 42 on the same side. Further, each ray source module of the ray source 3 is arranged to illuminate the detector crystal of the detector group on the opposite side with the center position of the ray beam. Specifically, the ray source module can rotate a predetermined angle relative to the target axis to adjust the beam-out angle of the ray beam of the ray source module, so that the center position of the ray beam illuminates the detector crystal. Here, the target axis refers to a virtual line connecting multiple target points in the ray source module. Since the detector crystal of the detector is located at the end position of the detector unit in the conveying direction of the detected object 6 and is arranged close to the edge of the ray beam of the ray source on the same side, the ray source module can only rotate a very small predetermined angle, for example, 1.5 degrees, so that the center position of the ray beam can illuminate the detector crystal. In this way, the adverse effect of the ray beam obliquely incident on the detector crystal surface on imaging can be minimized. In addition, the rotation of the ray source module is not limited to the rotation around the target axis, and can also be rotated relative to other axes other than the target axis to adjust the beam angle of the ray beam, wherein the rotation of the ray source relative to the target axis or other axes can be achieved by the installation and positioning structure of the ray source module described above. In addition, the method of adjusting the beam angle of the ray beam is not limited to the above embodiment, and can also be changed by other methods, such as changing the opening direction of the ray source module, adjusting the collimator, and other suitable methods, as long as the above arrangement of the ray source can be achieved.

[0190] In the ray scanning device of the embodiment of the present application, the ray source is composed of a plurality of ray source modules, and the ends of the plurality of ray source modules are directly connected or spaced apart. In the case where the ends of the ray source modules are directly connected, due to the presence of a mechanical connection structure between the ends, the ray source points between adjacent ray source modules are necessarily discontinuous, for example, the spacing between the target points at the ends of two adjacent ray source modules is significantly greater than the spacing between the target points inside the ray source modules; this is even more true when the ends of the ray source modules are spaced apart. Therefore, during the scanning process, projection data is lacking at the ends of adjacent ray source modules due to the lack of target points. In this regard, according to some embodiments, the image processing module of the ray scanning device of the present application is configured to have a data compensation function, which can compensate for the missing data of the viewing angle and / or repair the reconstructed image to improve the 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 the two.

[0191] The iterative method specifically includes the following steps:

[0192] Step 1: Use the missing view data to reconstruct the image, where the missing view data is the initial data measured by the detector, which lacks the projection data of the view without the target point. For example, when the X-ray scanning device uses Figure 2 or Figure 4 When the ray source is a non-continuous rectangular structure as shown in (a), the initial data measured by the detector lacks the projection data at the oblique angles of the four corners of the rectangular structure;

[0193] Step 2: forward reproject 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 perspective missing data. Forward reprojection according to the complete geometry means forward reprojection when the geometric shape is complete. Specifically, the geometric shape can be completed by speculation, assumption, etc.;

[0194] Step 3: Using the reprojected data obtained in step 2 as a reference, an image restoration algorithm is used to restore the missing view data in the projection domain, and the restored data is used to reconstruct the image again;

[0195] Step 4: Iterate the aforementioned forward reprojection step, perspective 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.

[0196] In the above iterative method, a convergence threshold can be set in advance. When the image obtained in the image reconstruction step satisfies the set convergence threshold, the iteration is stopped 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 is continued, that is, the forward reprojection step, the perspective missing data repair step and the image reconstruction step, until the image obtained in the image reconstruction step meets the set convergence threshold.

[0197] In the above iterative method, the image restoration algorithm in step 2 includes various traditional algorithms, such as methods based on TV regularization terms, wavelet analysis, dictionary learning, etc., as well as artificial neural network methods, etc.

[0198] In the above-mentioned iterative methods, image reconstruction methods include common algorithms such as analytical algorithms and iterative algorithms.

[0199] According to other embodiments, the image processing module may also use an image threshold restoration method to obtain a reconstructed image. Specifically, the image processing module may use the viewpoint missing data, i.e., the initial data measured by the detector, to perform image reconstruction, and use an image restoration algorithm at the image threshold to perform artifact removal and data correction processing on the reconstructed image to obtain a final reconstructed image. In this embodiment, the image restoration algorithm includes various traditional algorithms, such as methods based on TV regularization terms, wavelet analysis, dictionary learning, etc., and artificial neural network methods, etc.

[0200] According to other embodiments, the image processing module may use a combination of the above-mentioned iterative method and the above-mentioned image threshold repair method to perform image reconstruction to improve image quality. Specifically, the image processing module may first use the above-mentioned iterative method to complete the missing data in the projection domain and obtain a reconstructed image that meets the set convergence threshold, and then use the above-mentioned image threshold repair method to remove artifacts and perform data correction processing on the reconstructed image obtained by the above-mentioned iterative method using an image repair algorithm at the image threshold, and obtain the final reconstructed image.

[0201] Compared with a ray source using a distributed multi-point source, a ray source using a single point source has relatively sparse source points, and the image processing module can use an image reconstruction algorithm suitable for sparse viewing angle data to obtain a scanned image.

[0202] In the ray scanning device of the aforementioned embodiment, the ray source surrounds the scanning area on four sides: top, bottom, left, and right. According to other embodiments, the present application also provides a ray scanning device, the arrangement of which is basically the same as that of the ray scanning device of the aforementioned embodiment, and the difference mainly lies in the arrangement of the ray source, wherein the ray source surrounds the scanning area only on one of the upper side, the lower side, and the left and right sides. The following description is made by taking the arrangement of the ray source on the upper side, the lower side, and the right side of the scanning area as an example, but it is also applicable to the case where the ray source is arranged on the upper side, the lower side, and the left side of the scanning area.

[0203] Specifically, in the ray scanning device of the aforementioned embodiment, each ray source module of the ray source 3 is a distributed multi-point source, and the plurality of ray source modules can be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area. In the present embodiment, the plurality of ray source modules of the ray source can still be a distributed multi-point source, but the difference is that the plurality of ray source modules are arranged in a non-enclosed structure surrounding the scanning area and opening on the left side of the scanning area, such as a rectangular structure, a polygonal structure, an elliptical structure, etc. opening on the left side, where the left side of the scanning area refers to the left side of the scanning area in the vertical direction of the conveying direction of the detected object 6. In the aforementioned embodiment, the ray source 3 is arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon or a discontinuous rounded rectangle structure, as well as other polygonal and elliptical structures. Accordingly, in the present embodiment, the ray source is arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon or a rounded rectangle structure, as well as other polygonal and elliptical structures opening on the left side of the scanning area, such as relative to Figure 2 The ray source 3 of this embodiment at least does not include the ray source module 34 on the left side of the scanning area; for example, relative to Figure 4 (b)- Figure 4 As shown in (c), the ray source 3 of this embodiment at least does not include a ray source module on the left side of the detected object 6.

[0204] In addition, similar to the aforementioned embodiment, the ray source of this embodiment can also be composed of multiple single point source groups. The only difference from the aforementioned embodiment is that the ray source 3 of this embodiment does not include a single point source at the left side viewing angle, or does not include a single point source at the left side viewing angle and the upper left oblique viewing angle and the lower left oblique viewing angle.

[0205] Except for the above differences, other features of the ray source of this embodiment are the same as those of the ray source 3 in the above embodiment.

[0206] The features of the detector of this embodiment are basically the same as those of the detector 4 in the previous embodiment, except that in this embodiment, the detector is combined with a radiation source that surrounds the scanning area only on the upper side, the lower side, and the right side, and there is no radiation source module on the same side of the detector group of the detector 4 located on the left side of the scanning area. Therefore, in addition to the same method as the previous embodiment, the disassembly and installation of each detector group of the detector 4 can also be carried out in a different manner from the previous embodiment as described below, so as to further facilitate the disassembly, assembly, and maintenance of the detector. Specifically, Fig.13 As an example, the combination of the detector group and the radiation source shown in FIG. Figure 2 The detector set shown is the same as the Figure 2 Compared with the ray source shown in the figure, the ray source module on the left side of the scanning area is missing. The detector 4 can be disassembled and installed in the following manner: the detector groups 41', 43', 44' are perpendicular to the conveying direction of the detected object 6 (such as Fig.14 As shown, the detector group 42' is disassembled or installed relative to the support frame 5 along the X direction, and the detector group 42' is transported along the conveying direction of the detected object 6 (as shown in FIG. Fig.14 As shown, it is disassembled or installed relative to the supporting frame 5 along the Z direction).

[0207] The detector group 42' can adopt the same installation and fixing structure as the above-mentioned embodiment (such as Fig. 9 The mounting and fixing structures of the above-mentioned embodiments are not suitable for the disassembly or installation of the detector groups 41', 43', 44' along the X direction, so different mounting and fixing structures are required. The specific embodiments of these mounting and fixing structures will be described in detail below.

[0208] Similar to the mounting and fixing structure of the aforementioned embodiment, the mounting and fixing structure suitable for the assembly and disassembly of the detector groups 41', 43', and 44' in the X direction also specifically includes a first mounting portion, which is fixedly arranged on the detector group; a second mounting portion, which is fixedly arranged on the support frame of the ray scanning device and cooperates with the first mounting portion for linear movement, wherein the detector group can be moved to a predetermined mounting position along the second mounting portion when the first mounting portion and the second mounting portion cooperate with each other; and a fixing device, which is arranged on one side of the detector group along the width direction and is used to fix the detector group relative to the mounting reference surface on the support frame. In some specific embodiments, the detector groups 41', 43', and 44' are mounted and fixed to the support frame of the ray scanning device via a detector arm, wherein the first mounting portion is fixedly arranged on the detector arm, and the fixing device is arranged 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.

[0209] Fig.15The figure shows a mounting and fixing structure suitable for the detector group 41' according to some specific embodiments, wherein Figure (a) shows a stereoscopic view of the detector group in the installed state, Figure (b) is a side view of the detector group in the installed state, Figure (c) is a stereoscopic view of the detector group in the disassembled state, and Figure (d) is a cross-sectional view of the detector group with a fixing device in the installed state. Fig.15 As shown, the first mounting portion of the mounting and fixing structure of the detector group 41' includes a slider 412 disposed on the detector arm 411, and the slider 412 extends along the length direction of the detector arm 411, wherein when the detector group 41' is mounted in the ray scanning device, the length direction of the detector arm 411 is perpendicular to the conveying direction of the detected object 6. Fig.15 In the embodiment, the slider 412 extends over a portion of the length of the detector arm 411. In other embodiments, the slider 412 may also be configured to extend over the entire length or other lengths of the detector arm 411. In addition, the slider 412 may 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.

[0210] The second mounting portion is formed as a fixed guide rail 413 that matches the slider 412. The fixed guide rail 413 is fixedly connected to the support frame 5 ( Fig.15 The fixed guide rail 413 is formed on the support frame 5 (not shown in the figure), or can be integrally formed with the support frame 5. The length direction of the fixed guide rail 413 is perpendicular to the conveying direction of the object 6 to be detected by the ray scanning device. A limiting portion (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 group 41', the slider 412 is aligned with the fixed guide rail 413, and the detector group 41' is pushed along the fixed guide rail 413 until the detector arm 411 abuts against the limiting portion, thereby moving the detector group 41' to a predetermined installation position.

[0211] The fixing device is arranged on one side of the detector group 41' in the width direction, and abuts against the surface 414 of the detector arm 411 on one side in the width direction. Specifically, the fixing device includes a positioning member 415 and a fastener 416, wherein the positioning member 415 is fixedly connected to the support frame 5, and its end surface away from the support frame 5 is formed as a mounting reference surface 417, and the mounting reference surface 417 is used to abut against the surface 414 of the detector arm 411 on one side in the width direction. The surface 414 is the mounting surface of the detector arm 411, and both the surface 414 and the mounting reference surface 417 are processed 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 group 41' can be accurately positioned in the width direction. The fastener 416 can pass through the positioning member 415 and fasten the detector group 41' relative to the end surface 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 are provided with corresponding threaded holes on their sides opposite to the positioning member 415. The fastening bolt 416 is passed through the corresponding threaded hole and tightened to fasten the detector group 41' relative to the end surface of the positioning member 415. A plurality of fixing devices may be provided along the length direction of the detector group 41', for example, at least two, to firmly fix the detector group 41' on the support frame 5.

[0212] Through the above-mentioned installation and fixing structure, when installing the detector group 41', with the detector unit of the detector group 41' facing downward, first align the slider 412 on the detector group 41' with the fixed guide rail 413, so that the detector group 41' moves along the fixed guide rail 413 until it abuts against the limiting portion on the fixed guide rail 413; then, pass the fastening bolt 416 through the corresponding threaded holes on the positioning member 415 and the detector arm 411 and tighten it, so as to position the detector group 41' relative to the end surface of the positioning member 415, that is, the installation reference surface 417. When disassembling the detector group 41', the opposite operation can be performed.

[0213] Since the length direction of the fixed rail is perpendicular to the conveying direction of the detected object 6 of the ray scanning device, and there is no obstruction of the ray source on one side of the detector group 41' along the X direction, the detector group 41' can be disassembled or installed relative to the support frame 5 perpendicular to the conveying direction of the detected object 6 of the ray scanning device by means of the above-mentioned installation and fixing structure. In addition, the fixing device is arranged on one side of the detector group along the width direction, that is, one side of the detector along the Z direction, so the detector group can be fastened without being blocked by the ray source, which is convenient for the disassembly, assembly and maintenance of the detector group.

[0214] In addition, preferably, in the above-mentioned installation and fixing structure, the second installation portion is configured to support the detector group 41' at a predetermined installation position in a state of matching with the first installation portion. Specifically, the slider 412 is arranged on two opposite sides of the detector arm 411 along the width direction, and has inner extensions 4121, 4122 extending inward from the edges of the two opposite sides of the detector arm 411 along the width direction (see Fig.15 The fixed guide rail 413 includes extensions 4131 and 4132 extending outwardly on opposite sides along the width direction (see Fig.15 (b)); and, when the slider 412 is matched with the fixed guide rail 413, the inner extensions 4121, 4122 of the slider 412 are located above the outer extensions 4131, 4132 of the fixed guide rail 413 and the two are in contact and overlapped arrangement. Thus, after the detector group 41' is moved to the predetermined installation position along the fixed guide rail 413, the detector group 41' can be suspended on the outer extensions 4131, 4132 of the fixed guide rail 413 through the inner extensions 4121, 4122 of the slider 412. In this way, the fixed guide rail 413 can support the detector group 41' at the predetermined installation position without the need for other additional auxiliary structures or tools, and when the detector group 41' is tightened, the operator does not need to support the detector group 41' to operate, thereby improving the convenience of operation.

[0215] The detector group 43' is similar to the detector group 41' in that it is assembled and disassembled by using a combination of a slide block and a fixed guide rail. Specifically, Fig.16 The figures show the installation and fixing structure suitable for the detector group 43' according to some specific embodiments, wherein Figure (a) shows a stereoscopic view of the detector group in the installed state, and Figure (b) is a side view of the detector group in the installed state.

[0216] like Fig.16 As shown, the first mounting portion of the mounting and fixing structure of the detector group 43' includes a slider 432 arranged on the detector arm 431, and the slider 432 extends along the length direction of the detector arm 431, wherein when the detector group 43' is installed in the radiation scanning device, the length direction of the detector arm 431 is perpendicular to the conveying direction of the detected object 6 of the radiation scanning device. The slider 432 can be fixed to the detector arm 431 by bolt connection or the like, or can be integrally formed with the detector arm 431. The detector arm 431 is formed with a groove 433 extending along the length direction, and the slider 432 is arranged in the groove 433.

[0217] The second mounting portion 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 ray scanning device, and can also be integrally formed with the support frame 5. The length direction of the fixed guide rail 434 is perpendicular to the conveying direction of the detected object 6. A limiting portion (not shown in the figure) can be provided at one end of the fixed guide rail 434 along the length direction. When installing the detector group 43', align the slider 432 with the fixed guide rail 434, and push the detector group 43' along the fixed guide rail 434 until the detector arm 431 abuts against the limiting portion, thereby moving the detector group 43' to a predetermined installation position.

[0218] The fixing device of the mounting and fixing structure of the detector group 43' adopts the same fixing device as the detector group 41', and the specific structure of the fixing device will not be described in detail here. With the use of this fixing device, the detector group 43' can be fastened and fixed against the corresponding mounting reference surface on the support frame 5. The detector arm 431 of the detector group 43' is also provided with a mounting surface on one side along the width direction, and similarly, the mounting surface and the mounting reference surface on the support frame 5 are both processed to have good flatness, so that when the mounting surface of the detector arm 431 is against the mounting reference surface, the detector group 43' can be accurately positioned in the width direction. Similarly, a plurality of fixing devices, for example, at least two, can be provided along the length direction of the detector group 43' to firmly fix the detector group 43' on the support frame 5.

[0219] Through the above-mentioned installation and fixing structure, when installing the detector group 43', with the detector unit facing upward, first align the slider 432 on the detector group 43' with the fixed guide rail 434, so that the detector group 43' moves along the fixed guide rail 434 until it abuts against the limiting part on the fixed guide rail 434; then, pass the fastening bolts through the corresponding threaded holes on the positioning member and the detector arm and tighten them, so as to position the detector group 43' relative to the installation reference surface on the positioning member. When disassembling the detector group 43', just perform the opposite operation.

[0220] Since the length direction of the fixed rail is perpendicular to the conveying direction of the detected object 6 of the ray scanning device, and there is no obstruction of the ray source on one side of the detector group 43' along the X direction, the detector group 43' can be disassembled or installed relative to the support frame 5 perpendicular to the conveying direction of the detected object 6 of the ray scanning device by means of the above-mentioned installation and fixing structure. In addition, the fixing device is arranged on one side of the detector group 43' along the width direction, that is, one side of the detector along the Z direction, so the detector group can be fastened without being blocked by the ray source, which is convenient for the disassembly, assembly and maintenance of the detector group.

[0221] In addition, preferably, in the above-mentioned installation and fixing structure, the second installation portion is configured to support the detector group 43' at a predetermined installation position in a state of matching with the first installation portion. Fig.16 As shown, the fixed guide rail 434 includes supporting parts 4341 and 4342. In addition to being slidably matched with the slider 432, the supporting parts 4341 and 4342 also support the slider 432 below the slider 432, so that after the detector group 43' moves to the predetermined installation position along the fixed guide rail 434, the detector group 43' is supported from below at the predetermined installation position. In this way, when the detector group 43' is fastened, no additional tools are required and the operator does not need to support the detector group 43', so that the operation convenience is improved.

[0222] Fig.17 An installation and fixing structure suitable for a detector group 44' according to some specific embodiments is shown, wherein Figure (a) shows a stereoscopic view of the detector group in an installed state, Figure (b) is a schematic diagram of the first installation part and the second installation part of the installation and fixing structure in a separated state, and Figures (c) and (d) are stereoscopic views of the first installation part and the second installation part of the installation and fixing structure in a mating state from different perspectives.

[0223] The first mounting portion of the mounting and fixing structure of the detector group 44' is specifically formed as a fixing block 442 disposed on one side of the detector arm 441 along the width direction, and the fixing block 442 has an opening 443 facing one side of the detector arm 441 along the thickness direction. In the installed state of the detector group 44', the width direction of the detector arm 441 is consistent with the conveying direction of the detected object 6 of the ray scanning device, and the thickness direction is perpendicular to the conveying direction of the detected object 6. 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 bolt fixing or the like, or can be formed integrally with the detector arm 441.

[0224] The second mounting portion is formed as a cantilever portion 444 fixed on the support frame 5, and an extension portion 445 is provided at the end of the cantilever portion 444 away from the support frame 5, and the extension portion 445 is linearly movable with the opening 443 on the fixed block 442, that is, the extension portion 445 can be linearly moved from the edge of the opening 443 to the inside of the opening 443. The length direction of the cantilever portion 444 is consistent with the conveying direction of the object 6 to be detected by the ray scanning device. The bottom of the opening 443 can be used as a limiting portion. When installing the detector group 44', the opening 443 of the fixed block 442 on the detector arm 441 is aligned with the extension portion 445, and the detector arm 441 is linearly moved relative to the extension portion 445 until the bottom of the opening 443 abuts against the extension portion 445, thereby limiting the detector group 44' to a predetermined installation position.

[0225] The fixing device is arranged on one side of the detector arm 441 in the width direction (the same side as the fixing block 442), the end face of the fixing device is formed as a mounting reference face, and the fixing device fastens the detector arm 441 relative to the mounting reference face. 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 face 448, which is used to abut against a surface 449 on one side of the detector arm 441 in the width direction. Surface 449 is the mounting surface of the detector arm 441, and both the surface 449 and the mounting reference face 448 are processed to have good flatness. When the mounting surface 449 of the detector arm 441 is fixed against the mounting reference face 448, the detector group 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. The fastener 447 may be a fixing bolt, and corresponding threaded holes are formed on the side of the detector arm 441 opposite to the fixing member 446 in the width direction and on the fixing member 446. The fixing bolt 447 may pass through the corresponding threaded holes on the fixing member 446 and the detector arm 441 and be tightened to fasten the detector group 44' relative to the mounting reference surface 448. In addition, the fixing device may include a plurality of, for example, at least two, and the plurality of fixing devices may be arranged at intervals along the length direction of the detector group 41' to firmly fix and position the detector group 44'.

[0226] Through the above-mentioned installation and fixing structure, when installing the detector group 44', in a state where the detector unit faces the scanning area and the width direction is consistent with the conveying direction of the detected object 6, first align the opening 443 of the fixing block 442 on the detector group 44' with the extension 445 of the cantilever part 444, so that the detector group 44' moves 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, so as to position the detector group 44' relative to the installation reference surface 448 of the fixing member 446. When disassembling the detector group 44', the opposite operation can be performed.

[0227] Therefore, using the above-mentioned installation and fixing structure, since the cantilever portion 444 extends along the conveying direction of the object to be detected 6 in the X-ray scanning device, the width direction of the detector group 44' is parallel to the conveying direction of the object to be detected 6, and the opening 443 of the fixed block 442 is toward one side of the thickness direction of the detector group 44', by making the detector crystal face the scanning area, the detector group 44' can be installed or removed in a direction perpendicular to the conveying direction of the object to be detected 6.

[0228] In addition, preferably, in the above-mentioned installation and fixing structure, the second installation part is configured to support the detector group 44' at a predetermined installation position in a state of matching with the first installation part. That is, after the detector group 44' moves to the predetermined installation position relative to the extension part 445 of the cantilever part 444, the cantilever part 444 can support the entire detector group 44' through the fixing block 442 without the need for other auxiliary structures or tools. In this way, when the detector group 44' is fastened, no additional tools are required and the operator does not need to support the detector group 44', so that the operation can be carried out, thereby improving the convenience of operation.

[0229] Although each detector group 41', 42', 43', 44' adopts different fixed installation structures to be disassembled or installed relative to the support frame 5, each detector group can still be located in the same plane perpendicular to the conveying direction of the detected object 6 with other detector groups after installation. Specifically, setting the installation reference surface of each detector group in the same plane perpendicular to the conveying direction of the detected object 6 can ensure that each detector group 41', 42', 43', 44' is located in the same plane perpendicular to the conveying direction of the detected object 6 after installation.

[0230] also, Figure 15-16 The linear movement cooperation between the first mounting part and the second mounting part of the fixed mounting structure adopts a slider guide rail cooperation. According to other embodiments, the fixed mounting structure of the present application can also adopt other linear movement cooperation, such as linear sliding or linear rolling cooperation, such as linear ball bearing and cylindrical shaft cooperation.

[0231] The above describes the installation and fixing structure of the detector group of the detector 4 of the ray scanning device of this embodiment. The following continues to describe other features of the ray scanning device of this embodiment.

[0232] The relative arrangement of the ray source 3 and the detector 4 of the ray scanning device of this embodiment is basically the same as that of the previous embodiment. Similar to the aforementioned embodiment, the ray source 3 includes a plurality of ray source modules, each of which is arranged around the scanning area and is located in a plane perpendicular to the conveying direction of the detected object 6, in particular, in the same plane; the detector 4 includes a plurality of detector groups, each of which is located in other planes perpendicular to the conveying direction of the detected object 6, in particular, in the same plane, and the ends of each detector group are interconnected to be arranged around the scanning area, and further, in the combined state of the ray source 3 and the detector 4, the detector 4 is arranged on the inner side of the ray source 3 along the perpendicular direction of the conveying direction of the detected object 6, and the ray source 3 and the detector 4 are arranged to at least partially overlap in the conveying direction of the detected object 6, wherein the plurality of detector groups of the detector 4 may be any of the closed square structures, rectangular structures, polygonal structures or elliptical structures surrounding the scanning area as described in the aforementioned embodiment; different from the aforementioned embodiment, the plurality of ray source modules of the ray source 3 are arranged into a non-closed structure surrounding the scanning area and 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, such as any of the structures described above in this embodiment.

[0233] Similar to the aforementioned embodiment, each detector group of the detector 4 of this embodiment is preferably arranged so as not to block the ray beam of the ray source module on the same side, while being able to receive rays from each ray source module on the other sides. Since the ray source 3 and the detector 4 are both arranged in a ring shape (wherein the ray source 3 is a semi-closed ring with an opening on the left side), the same detector group can be shared by different ray source modules of the ray source. In addition, in addition to being detected by the detector group on the opposite side, the rays of each ray source module of the ray source 3 can also be detected by the detector group on the other side, so the rays of each ray source module can be detected by the detector as much as possible. Therefore, the detector of this embodiment can also reduce the number of detector groups and reduce equipment costs while improving image quality.

[0234] In addition, similar to the above-mentioned embodiment, preferably, the detector crystals of each detector group of the detector 4 are arranged at the end of the detector unit along the conveying direction of the detected object 6, and are arranged to be close to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object 6, but do not block the ray beam of the ray source module on the same side. In this way, the coverage length of the optical path between the ray source and the detector can be reduced as much as possible, thereby reducing the length of the device.

[0235] In addition, similar to the aforementioned embodiment, more preferably, each ray source module of the ray source 3 is arranged so that the 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 embodiment, the ray source module can rotate a predetermined angle relative to the target axis to adjust the beam-out angle of the ray beam of the ray source module, so that the center position of the ray beam irradiates the detector crystal. Since the detector crystal of the detector is located at the end position of the detector unit in the conveying direction of the detected object 6 and is arranged close to the edge of the ray beam of the ray source on the same side, the ray source module can only rotate a very small predetermined angle, such as 1.5 degrees, so that the center position of the ray beam can irradiate the detector crystal. In this way, the adverse effect of the ray beam obliquely incident on the detector crystal surface on imaging can be minimized. Similar to the aforementioned embodiment, the ray source module can rotate around the target axis or other axis, or adjust the beam-out angle of the ray beam by other suitable methods mentioned in the aforementioned embodiment.

[0236] In addition, similar to the previous embodiment, the ends of the adjacent ray source modules of the ray source of this embodiment also lack projection data, so the image processing module of the ray scanning device of this embodiment is also configured to have a data compensation function, which can compensate for the missing data of the viewing angle and / or repair the reconstructed image to improve the image quality. The image processing module of the ray scanning device of this embodiment uses the same method as the previous embodiment to reconstruct the image.

[0237] In addition to having the same advantages as the ray scanning device of the previous embodiment, the ray scanning device of this embodiment also has the following advantages.

[0238] The ray scanning device of this embodiment is particularly suitable for use in airport hand luggage security inspection. Airport hand luggage has the characteristics of small volume (for example, usually within 600mm*400mm), large length, width and small thickness, and when it is placed on a conveyor for inspection, the thickness is usually along the up and down direction, the width is along the left and right direction, and the length is along the conveying direction. The ray scanning device of this embodiment arranges ray source modules on both the upper and lower sides of the scanning area to scan the luggage in the thickness direction. In this way, more projection data can be obtained in the thickness direction of the smaller size. In addition, due to the small thickness of the luggage, the projection data in the thickness direction is less affected by self-shading and ray attenuation. Therefore, the projection data in the thickness direction is more accurate and clear compared with other directions, which is conducive to improving image quality. At the same time, the ray source of the ray scanning device of the present invention is only provided with a ray source module on one side in the width direction of the luggage. In the width direction, the projection data is greatly affected by the self-shading and ray attenuation of the luggage items. Therefore, the quality of the projection data is poorer than the quality of the projection data in the thickness direction. The ray source module is only provided on one side in the width direction of the luggage, which can reduce the cost of the ray source while ensuring the image quality.

[0239] In addition, although the ray scanning device of this embodiment does not have a ray source on the left side of the scanning area, it still has a right detector group opposite to the left side of the scanning area, and the right detector group can receive the rays of the ray source modules on the upper and lower sides, and increase the corresponding detection data of the rays of the ray source modules on the upper and lower sides. Therefore, compared with the case where only the detector group is set on the opposite side of each ray source module, the image quality can be improved.

[0240] In addition, this embodiment is described by taking the example of multiple radiation source modules of the radiation source being arranged in the same plane perpendicular to the conveying direction of the object to be detected, but it is also applicable to the situation where multiple radiation source modules of the radiation source are arranged in different planes perpendicular to the conveying direction of the object to be detected.

[0241] In addition, the embodiment is described by taking the case where multiple detector groups of detectors are arranged in the same plane of the conveying direction of the detected object as an example, but it is also applicable to the case where multiple detector groups of detectors are arranged in different planes perpendicular to the conveying direction of the detected object.

[0242] In the aforementioned embodiment, a ray scanning device is described in which a ray source surrounds a scanning area on four sides: top, bottom, left, and right. According to other embodiments, the present application also provides a ray scanning device, the arrangement of which is basically the same as that of the ray scanning device in the aforementioned embodiment, and the difference mainly lies in the arrangement of the ray source. In this embodiment, the ray source surrounds the scanning area only on three sides: top, left, and right. That is, the ray source surrounds the scanning area only above the conveying device, and no ray source module is provided below the conveying device (for details, see Fig.18 , Fig.18 ) Here, the above of the conveying device includes not only the directly above the conveying device, but also the side above the conveying device; in addition, the above of the conveying device is not strictly limited to being higher than the conveying device in height, and the situation that the above of the conveying device is substantially the same as the conveying device in height, or slightly lower than the conveying device is also included in the scope of this embodiment.

[0243] Specifically, in the ray scanning device of the aforementioned embodiment, each ray source module of the ray source 3 is a distributed multi-point source, and the plurality of ray source modules can be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area. In the present embodiment, the plurality of ray source modules of the ray source can still be a distributed multi-point source, but the difference is that the plurality of ray source modules are arranged in a non-enclosed structure opening below the conveying device surrounding the scanning area, such as a rectangular structure, a polygonal structure, an elliptical structure, etc. opening below the conveying device. In the aforementioned embodiment, the ray source 3 is arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon, or a discontinuous rounded rectangle structure, as well as other polygonal and elliptical structures, while in the present embodiment, the ray source is arranged in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon, or a discontinuous rounded rectangle structure, as well as other polygonal and elliptical structures opening below the conveying device, such as with respect to Figure 2 The ray source 3 of this embodiment at least does not include the ray source module 33 below, and in some cases does not include the portion of the ray source modules 32 and 34 below the conveying device 1; for example, relative to Figure 4 As for the ray sources shown in (b)-(c), the ray source 3 of this embodiment at least does not include a ray source module below the detected object 6.

[0244] In addition, similar to the aforementioned embodiment, the ray source of this embodiment can also be composed of multiple single point source groups, the only difference is that the ray source 3 of this embodiment does not include single point sources at the bottom viewing angle, the lower left oblique viewing angle and the lower right oblique viewing angle.

[0245] Except for the above differences, other features of the ray source of this embodiment are the same as those of the ray source 3 in the aforementioned embodiment.

[0246] The features of the detector of this embodiment in various aspects are basically the same as those of 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 side, the left side, and the right side, and there is no radiation source module on the same side of the detector group of the detector 4 located below the scanning area, and the disassembly and installation of the detector group of the detector 4 located below the scanning area will not be hindered by the radiation source module on the lower side. Therefore, in addition to being able to use the same mounting and fixing structure as the aforementioned embodiment for disassembly and assembly, the detector group located below the scanning area can also be disassembled or installed relative to the support frame 5 in a direction perpendicular to the conveying direction of the detected object 6 without being hindered by the radiation source module on the left or right side. Specifically, the aforementioned reference method can be used. Fig.16 The described installation and fixing structure is disassembled and assembled.

[0247] In addition, the relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device of this embodiment is substantially the same as that of the aforementioned embodiment. Specifically, similar to the aforementioned embodiment, the ray source 3 includes a plurality of ray source modules, each of which is arranged around the scanning area and is located in a plane perpendicular to the conveying direction of the detected object 6, in particular, in the same plane; the detector 4 includes a plurality of detector groups, each of which is located in other planes perpendicular to the conveying direction of the detected object 6, in particular, in the same plane, and the ends of each detector group are interconnected to be arranged around the scanning area, and further, in the combined state of the ray source 3 and the detector 4, the detector 4 is arranged on the inner side of the ray source 3 along the perpendicular direction of the conveying direction of the detected object 6, and the ray source 3 and the detector 4 at least partially overlap in the conveying direction of the detected object 6, wherein the plurality of detector groups of the detector 4 may be any of the closed square structures, rectangular structures, polygonal structures or elliptical structures surrounding the scanning area as described in the aforementioned embodiment; different from the aforementioned embodiment, the plurality of ray source modules of the ray source 3 are arranged into a non-enclosed structure opening below the conveying device surrounding the scanning area, such as a rectangular structure, polygonal structure, elliptical structure, etc. opening below the conveying device, such as any of the structures described above in this embodiment.

[0248] Similar to the aforementioned embodiment, each detector group of the detector 4 of this embodiment is preferably arranged so as not to block the ray beam of the ray source module on the same side, while being able to receive rays from each ray source module on the other sides. Since the ray source 3 and the detector 4 are both arranged in a ring shape (wherein the ray source 3 is a semi-closed ring with an opening at the bottom), the same detector group can be shared by different ray source modules of the ray source. In addition, in addition to being detected by the detector group on the opposite side, the rays of each ray source module of the ray source 3 can also be detected by the detector group on the other side, so the rays of each ray source module can be detected by the detector as much as possible. Therefore, the detector of this embodiment can also reduce the number of detector groups and reduce equipment costs while improving image quality.

[0249] In addition, similar to the above-mentioned embodiment, preferably, the detector crystals of each detector group of the detector 4 are arranged at the end of the detector unit along the conveying direction of the detected object 6, and are arranged to be close to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object 6, but do not block the ray beam of the ray source module on the same side. In this way, the coverage length of the optical path between the ray source and the detector can be reduced as much as possible, thereby reducing the length of the device.

[0250] In addition, similar to the aforementioned embodiment, more preferably, each ray source module of the ray source 3 is arranged so that the 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 embodiment, the ray source module can rotate a predetermined angle relative to the target axis to adjust the beam-out angle of the ray beam of the ray source module, so that the center position of the ray beam irradiates the detector crystal. Since the detector crystal of the detector is located at the end position of the detector unit in the conveying direction of the detected object 6 and is arranged close to the edge of the ray beam of the ray source on the same side, the ray source module can only rotate a very small predetermined angle, such as 1.5 degrees, so that the center position of the ray beam can irradiate the detector crystal. In this way, the adverse effect of the ray beam obliquely incident on the detector crystal surface on imaging can be minimized. Similar to the aforementioned embodiment, the ray source module can rotate around the target axis or other axis, or adjust the beam-out angle of the ray beam by other suitable methods mentioned in the aforementioned embodiment.

[0251] In addition, similar to the previous embodiment, the ends of the adjacent ray source modules of the ray source of this embodiment also lack projection data, so the image processing module of the ray scanning device of this embodiment is also configured to have a data compensation function, which can compensate for the missing data of the viewing angle and / or repair the reconstructed image to improve the image quality. The image processing module of the ray scanning device of this embodiment uses the same method as the previous embodiment to reconstruct the image.

[0252] In addition to having the same advantages as the ray scanning device of the aforementioned embodiment, the ray scanning device of this embodiment also has the following advantages.

[0253] The ray scanning device of this embodiment does not have a ray source module arranged under the conveying device, so the height of the conveying device can be lowered to facilitate the transportation of the inspected items to the conveying device; in addition, compared with the aforementioned embodiment in which a ray source module is also arranged under the conveying device, this embodiment can save equipment costs.

[0254] In addition, although the ray scanning device of this embodiment is not provided with a lower ray source, an upper detector group opposite to the lower position is still provided, and the upper detector group can receive the rays from the ray source modules on the left and right sides, and increase the corresponding detection data of the rays from the ray source modules on the left and right sides. Therefore, compared with the case where only the detector group is provided on the opposite side of each ray source module, the image quality can be improved.

[0255] In addition, this embodiment is described by taking the example of multiple radiation source modules of the radiation source being arranged in the same plane perpendicular to the conveying direction of the object to be detected, but it is also applicable to the situation where multiple radiation source modules of the radiation source are arranged in different planes perpendicular to the conveying direction of the object to be detected.

[0256] In addition, the embodiment is described by taking the case where multiple detector groups of detectors are arranged in the same plane of the conveying direction of the detected object as an example, but it is also applicable to the case where multiple detector groups of detectors are arranged in different planes perpendicular to the conveying direction of the detected object.

[0257] In the aforementioned embodiment, a ray scanning device is described in which a ray source and a detector surround a scanning area on four sides, up, down, left, and right. According to other embodiments, the present application also provides a ray scanning device, which has a substantially same structure as the ray scanning device of the aforementioned embodiment, except that the arrangement of the ray source and the detector is different. The specific differences are as follows: In this embodiment, from the perspective of the conveying direction of the detected object, a plurality of ray source modules of the ray source are arranged around the scanning area in a non-enclosed structure with an opening on one side of the scanning area, and a plurality of detector groups of the detector are also arranged around the scanning area in a non-enclosed structure with an opening on one side of the scanning area, and the opening of the non-enclosed structure of the detector is arranged opposite to the opening of the non-enclosed structure of the ray source; in addition, a plurality of detector groups of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, while a plurality of ray source modules of the ray source are fixed in a plurality of different planes perpendicular to the conveying direction of the detected object, for example, a ray source module of the ray source arranged on one side of the opening of the non-enclosed structure of the detector and each detector group of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, while other ray source modules of the ray source are fixed in other planes perpendicular to the conveying direction of the detected object.

[0258] The structure and arrangement of the radiation source of the radiation scanning device according to this embodiment are described in detail below.

[0259] Similar to the above-mentioned embodiment, the ray source of the ray scanning device of this embodiment includes a plurality of ray source modules, and each ray source module may be a distributed multi-point source. As a distributed multi-point source, each ray source module may have a plurality of target points, each target point of each ray source module may generate a ray beam separately, and each target point may generate a ray beam in a predetermined time sequence under the control of the control device. The ray beam may be a fan-shaped beam with an opening angle A, such as Figure 3 Of course, the shape of the ray beam is not limited to the fan beam, and can also be a cone beam, parallel beam or other ray beams, which can be specifically set as needed.

[0260] In the aforementioned embodiment, the plurality of radiation source modules of the radiation source surround the scanning area on four sides when viewed along the conveying direction of the detected object, while in the present embodiment, the plurality of radiation source modules of the radiation source are arranged around the scanning area on only three sides when viewed along the conveying direction of the detected object, that is, they are arranged around the scanning area in a non-enclosed structure that is open on one side of the scanning area. Specifically, Figure 19-21 As shown ( Fig.19 is a three-dimensional schematic diagram of the layout of the radiation source and the detector of the radiation scanning device according to this embodiment, Fig. 20 yes Fig.19 The schematic side view of the ray source and the detector as viewed along the conveying direction of the detected object is shown. Fig.21 yes Fig.19 The schematic top view of the layout of the radiation source and the detector shown in FIG. 1 , wherein the radiation source modules on the left and right sides of the scanning area are arranged in the same plane perpendicular to the conveying direction of the detected object (eg Fig.21 The solid line ray exit position in FIG. 1 is shown), and the ray source module below the scanning area is arranged in another plane perpendicular to the conveying direction of the detected object (as shown in FIG. Fig.21As shown in the dotted ray outlet position in the figure), when viewed from the conveying direction of the detected object, the ray source 3 includes ray source modules 31, 32, 33 respectively arranged on the left, right and bottom sides of the scanning area, and the ray source modules 31, 32, 33 form a non-enclosed structure surrounding the scanning area with an opening on the upper side of the scanning area. In the illustrated embodiment, the ray source module is a linear distributed multi-point source, and the non-enclosed structure of the ray source is a right-angled rectangular structure opening on the upper side of the scanning area. The ray source modules 31, 32, 33 of the ray source 3 are not limited to linear distributed multi-point sources, and according to other embodiments, they can also be in the shape of an arc, a broken line, etc. The linear, arc-shaped or broken line-shaped ray source modules can be arranged or combined as needed, so that when viewed from the conveying direction of the detected object, the ray source 3 can be in the shape of a rounded rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area with an opening on the upper side of the scanning area. In addition, when viewed along the conveying direction of the detected object, the ray source module of the ray source 3 is not limited to being arranged on the left side, right side and bottom side of the scanning area, and can also be arranged, for example, on the top side, left side and right side, both upper and lower sides and the left side, and both upper and lower sides and the right side, and can be specifically arranged according to the actual use scenario. In the following description of this embodiment, the case where the ray source module is arranged on the left side, right side and bottom side of the scanning area is described as an example, but the described principle is also applicable to the case where the ray source module is arranged on any other three sides.

[0261] Similar to the aforementioned embodiment, the multiple ray source modules of the ray source of this embodiment can also be independently disassembled and installed, that is, each ray source module has a separate cavity for accommodating its own ray generating device, and each ray source module has a separate cavity, which means that multiple targets of each ray source module share a single vacuum cavity. The spacing of multiple targets of each ray source module in the vacuum cavity can be determined by the number of targets and the length of the cavity. According to some embodiments, the number of targets in a single ray source module can be 192, 264, etc., and the target spacing in a single ray source module can be 4mm, 12mm, etc. Each ray source module has a separate cavity, which has the following advantages: relative to the ray source of an integrated annular cavity (that is, all the targets of the ray source are located in the same annular vacuum cavity), the outer shell size of a single ray source module and the volume of the internal vacuum cavity can be reduced, so that the volume of a single ray source module is reduced and the weight is reduced, thereby facilitating the disassembly and installation of the ray source; in addition, each ray source module uses a separate vacuum cavity, which can reduce the risk of ignition in the cavity when the ray source module is maintained.

[0262] Further, similar to the aforementioned embodiment, each ray source module of the ray source 3 is provided with an installation and positioning structure to facilitate the installation and adjustment of the ray source module. With the help of the installation and positioning structure, each ray source module of the ray source 3 can be installed and fixed at a predetermined position in the ray scanning device. In addition, with the help of the installation and positioning structure, the ray source module can also be rotated to adjust the beam-out angle of the ray beam. Due to the different positions of each ray source module of the ray source 3 in the ray scanning device, different installation methods can be adopted and different installation and positioning structures can be provided. For example, the ray 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 the ray source modules located on the lower side of the scanning area are not suitable for hoisting and can be installed by using the installation and positioning structure described in the aforementioned embodiment (such as Figure 5 The installation and positioning structure shown in the figure is used to install and fix or adjust the beam output angle of the ray beam.

[0263] In addition, similar to the above-mentioned embodiment, the ray source 3 may also be composed of a plurality of single point sources, and each ray source module may be a single point source group, each single point source group including at least two single point sources. Each single point source may emit a ray beam individually, for example, a fan-shaped beam with an opening angle A (such as Figure 3 As shown). Each single point source of the ray source 3 can emit rays according to a predetermined timing under the control of the control device of the ray scanning system. In the case where each ray source module is a single point source group, when observed from the conveying direction of the detected object 6, the single point source group is at least distributed at the bottom viewing angle, the left viewing angle and the right viewing angle, and can be further distributed at the corner oblique viewing angle, such as the lower left oblique viewing angle and the lower right oblique viewing angle, and even further includes the upper left oblique viewing angle and the upper right oblique viewing angle (such as Fig. 22 shown).

[0264] The arrangement of the detector 4 of the ray scanning device of this embodiment is described in detail below. As in the aforementioned embodiment, the detector 4 may include a plurality of detector groups, and the plurality of detector groups are preferably located in the same plane perpendicular to the conveying direction of the detected object 6. In addition, as in the aforementioned embodiment, the detector group of this embodiment is also a detector array including a plurality of detector units.

[0265] Furthermore, in the aforementioned embodiment, the plurality of detector groups of the detector 4 are arranged around the scanning area on four sides when viewed along the conveying direction of the detected object, forming a closed structure surrounding the scanning area, whereas in the present embodiment, the detector groups of the detector 4 are arranged around the scanning area on only three sides when viewed along the conveying direction of the detected object, i.e., 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 19-21As shown, the detector 4 includes detector groups 41, 42, 43 respectively arranged on the left, right and upper sides of the scanning area, and the ends of the detector groups 41, 42, 43 are connected to each other to form a non-enclosed structure surrounding the scanning area and opening at the lower side of the scanning area. Figure 19-21 In the illustrated embodiment, the detector groups 41, 42, and 43 are linear detector arrays including a plurality of detector units arranged along a straight line, thereby forming a non-enclosed rectangular or square structure that is open at the bottom of the scanning area. However, the detector 4 of the present embodiment is not limited to the above structure, and may also be arranged in other structures. For example, the detector 4 may include three longer linear detector arrays and two shorter linear detector arrays, which are alternately arranged around the scanning area and connected at their ends to form a non-enclosed polygonal structure that is open at the bottom of the scanning area (e.g., Fig.23 As shown). In addition, the detector 4 may also include another number of multiple longer linear detector arrays and another number of multiple shorter linear detector arrays, which are alternately arranged around the scanning area and connected at their ends to form other non-enclosed polygonal structures that are open at the bottom of the scanning area. The detector group of the detector 4 of this embodiment may also be an arc-shaped detector array, and multiple arc-shaped detector arrays are arranged around the scanning area and connected at their ends to form a non-enclosed elliptical structure that is open at the bottom of the scanning area. The detector group of the detector 4 of this embodiment may also be a combination of a linear detector array and an arc-shaped detector array to form other shapes of non-enclosed structures that are open at the bottom of the scanning area, such as a rounded rectangular structure that is open at the bottom of the scanning area. Here, the structure of the detector unit and the structure of the detector group in the form of a linear detector array and an arc-shaped detector array are exactly the same as the structure described in the aforementioned embodiment.

[0266] In addition, the detector group of the detector 4 is not limited to Figure 19-21 The arrangement shown is on the left side, right side and upper side of the scanning area, and can also be arranged, for example, on the lower side, left side and right side, both upper and lower sides and left side, and both upper and lower sides and right side, as long as the opening of the non-enclosed structure of the ray source can be opposite to the opening of the non-enclosed structure of the ray source. Figure 19-21 The case where the detector groups are arranged on the left side, right side and top side of the scanning area is described as an example, but this embodiment is also applicable to the case where the detector groups are arranged on any other three sides.

[0267] In addition, similar to the aforementioned embodiment, in some embodiments, each detector group of the detector 4 can be independently disassembled and installed, thereby improving the maintainability of the detector. Moreover, similar to the aforementioned embodiment, the multiple detector groups of the detector 4 of this embodiment are configured to be moved along the conveying direction of the detected object 6 for disassembly and installation, so that when the detector groups of the detector 4 are arranged inside the radiation source 3 along a direction perpendicular to the conveying direction of the detected 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 in the figure, the detector groups 41, 42, 43 can be moved in a direction parallel to the conveying direction of the detected object 6 for disassembly and installation, so that they can be disassembled, adjusted and maintained without disassembling the radiation source modules 31, 32, 33. The detector groups 41, 42, 43 of the detector 4 can adopt the same installation and fixing structure as described in the above-mentioned embodiment (such as Fig. 9 The detector groups 41, 42, and 43 are moved relative to their installation positions in the radiation scanning device along the conveying direction of the detected object 6 to be removed from or installed to the installation positions. For example, similar to the aforementioned embodiments, the detector groups 41, 42, and 43 can be installed to or removed from the support frame 5 of the radiation scanning device via the detector arms.

[0268] In addition, when the opening of the non-enclosed structure of the radiation source or the detector faces the left or right side of the scanning area, the detector group of the detector 4 can also be moved in the vertical direction of the conveying direction of the detected object to be disassembled and installed. Fig.24 As shown in the figure, when viewed along the conveying direction of the detected object, the opening of the non-enclosed structure of the ray source modules 31, 32, 33 of the ray source faces the left side of the scanning area, and the opening of the non-enclosed structure of the detector group 41, 42, 43 of the detector 4 faces the right side of the scanning area. In this case, the detector group 41, 42, 43 can be moved relative to the installation position (for example, the support frame 5) in a direction perpendicular to the conveying direction of the detected object to be removed or installed. The specific moving direction is as follows: Fig.24 As shown by the arrow in (b) of FIG. 1 . Since there is no ray source module on the left side of the scanning area, the ray source does not hinder the above-mentioned movement of the detector, and the detector group can be easily disassembled. The mounting and fixing structure for disassembling the detector group in the vertical direction along the conveying direction of the detected object described above can be used, for example, referring to Figure 15-17 The described installation and fixing structure and its variations realize such an assembly and disassembly method.

[0269] In addition, the detector group of the detector 4 can also be arranged so that part of it moves along the conveying direction of the detected object for disassembly and installation, and the other part moves along the direction perpendicular to the conveying direction of the detected object for disassembly and installation. Figure 19-21 In the embodiment shown, if the highest point of the ray source modules 31, 32 on the left or right side of the scanning area is lower than the detector group 41 above the scanning area, the detector group 41 can also be moved in the vertical direction of the conveying direction of the detected object for removal and installation. Fig.15 Similarly, if the detector groups of the detector 4 are arranged on the left, right and lower sides of the scanning area, and the detector group on the lower side is lower than the lowest point of the left and right ray source modules, the detector group on the lower side can also be moved in the vertical direction of the conveying direction of the detected object to be disassembled and installed. The specific installation and fixing structure can be adopted Fig.16 The illustrated embodiments and their variations.

[0270] In addition, similar to the aforementioned embodiment, the multiple detector groups of the detector are located in the same plane perpendicular to the conveying direction of the detected object 6 after installation by means of their respective mounting surfaces and corresponding mounting reference planes (arranged in the same plane perpendicular to the conveying direction of the detected object 6).

[0271] The relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device according to the present embodiment is further described below. The relative arrangement of the radiation source 3 and the detector 4 of the present embodiment is different from that of the aforementioned embodiment. In the present embodiment, in the combined state of the radiation source and the detector, the opening of the non-enclosed structure of the radiation source is arranged relative to the opening of the non-enclosed structure of the detector, and the multiple detector groups of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, while the multiple radiation source modules of the radiation source are arranged in multiple planes perpendicular to the conveying direction of the detected object. For example, the radiation source module of the radiation source arranged on one side of the opening of the non-enclosed structure of the detector is fixed in the same plane perpendicular to the conveying direction of the detected object as are the respective detector groups of the detector, while the other radiation source modules of the radiation source are fixed in other planes perpendicular to the conveying direction of the detected object. The other radiation source modules of the radiation source may be located in other single planes perpendicular to the conveying direction of the detected object or in other multiple different planes, preferably in other single planes. In the present embodiment, the other radiation source modules are arranged in other single planes perpendicular to the conveying direction of the detected object (such as Fig.21 The description is made with reference to the example of FIG. 1 , but the same is applicable to the cases of other multiple different planes.

[0272] In the combined state of the radiation source and the detector, the radiation source can be a structure of any embodiment as described above, such as a rectangular, polygonal, or elliptical structure with an opening on one side of the scanning area when viewed along the conveying direction of the detected object, and the detector can be a structure of any embodiment as described above, 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 radiation source and the detector structures are arranged relative to each other. Figure 19-21 The illustrated embodiment is used as an example to describe the detailed arrangement of the ray source 3 and the detector 4 in a combined state, but the same principle is also applicable to any other structural combination of the ray source 3 and the detector 4.

[0273] In particular, similar to the aforementioned embodiment, based on the combination of the ray source 3 and the detector 4 as described above, in view of the annular arrangement (semi-closed ring) of the detector, the detector groups 41, 42, 43 of the detector 4 can be respectively arranged to receive the rays from each ray source module on the remaining sides, so that multiple ray source modules of the ray source can share each detector group of the detector. Thus, the number of detector groups can be reduced. In addition, since the rays of the ray source modules 31 and 32 can be respectively detected by the detector groups 42 and 41 on the opposite sides, they can also be received by the detector groups on other sides except the detector on the same side, and the rays of the ray source module 33 can be received by all the detector groups 41, 42, 43, therefore, the rays of each ray source module can be detected by the detector as much as possible. As a result, although the ray source modules and detectors are arranged only on three sides of the scanning area, the ray scanning device of this embodiment can still obtain sufficient detection data for image reconstruction. At the same time, since the ray source modules and detector groups are reduced, the weight of the device can be reduced, which is conducive to the construction of a lightweight ray scanning device.

[0274] In addition, in particular, the ray source module 33 of the ray source 3 is arranged to be in the same plane as the detector groups 41, 42, 43 of the detector 4, which is perpendicular to the conveying direction of the detected object. This specifically means that the ray outlet of the ray source module 33 is directly opposite to the detector crystals of each detector group (such as Fig.21 As shown). Thus, the ray beam of the ray source module 33 can cover more detector crystals, which is beneficial for obtaining more detection data and improving image quality.

[0275] In addition, similar to the detector groups in the above-mentioned embodiments, when viewed from the conveying direction of the detected object, that is, in the vertical direction of the conveying direction of the detected object, the detector groups 41 and 42 on the same side as the other ray source modules 31 and 32 of the detector 4 are respectively arranged between the other ray source modules 31 and 32 of the ray source 3 and the scanning area, and along the conveying direction of the detected object, the other ray source modules 31 and 32 at least partially overlap with the detector groups 41 and 42 on the same side (e.g., Fig.21 As shown). Thus, the length of the device covered by the optical path between the ray source and the detector can be reduced, thereby reducing the total length of the device.

[0276] In addition, similar to the various detector groups in the aforementioned embodiments, when the detector groups 41, 42 at least partially overlap with the radiation source modules 31, 32 in the conveying direction of the detected object, the detector groups 41, 42 are configured to avoid the radiation beams of the radiation source modules 31, 32 on the same side, respectively, and receive radiation from all other side radiation source modules except the radiation source modules on the same side.

[0277] Furthermore, similar to the aforementioned embodiment, the detector crystals of each detector group of the detector 4 are arranged at the end of the detector unit along the conveying direction of the detected object, and the detector groups 41 and 42 of the detector 4 on the same side as the other ray source modules 31 and 32 are arranged to be close to the edges of the ray beams of the ray source modules 31 and 32 on the same side in the conveying direction of the detected object, but do not block the ray beams of the ray source modules 31 and 32 on the same side. As a result, the ray source 3 and the detector 4 can overlap to the greatest extent in the conveying direction of the detected object 6, so that the device length covered by the optical path between the ray source and the detector can be reduced as much as possible, thereby reducing the total length of the device.

[0278] More specifically, similar to the aforementioned embodiment, the ray source modules 31 and 32 of the ray source 3 are arranged so that the ray beams avoid the detector groups 41 and 42 on the same side and irradiate the detector crystals of the detector group on the opposite side. Further, similar to the aforementioned embodiment, the ray source modules 31 and 32 can rotate by a predetermined angle relative to their respective target axes to adjust the beam-out angles of their respective ray beams, so that the center positions of their respective ray beams irradiate the detector crystals on the opposite sides. Since the detector crystals of the detectors are located at the end positions of the detector units in the conveying direction of the detected objects and are arranged close to the edge of the ray beams of the ray source on the same side, the ray source modules can be rotated by only a very small predetermined angle, such as 1.5 degrees, so that the center position of the ray beams can irradiate the detector crystals. In this way, the adverse effects of the oblique incidence of the ray beams on the surface of the detector crystals on the imaging can be minimized. In addition, similar to the aforementioned embodiment, the ray source modules can be rotated around the target axis or other axis, or the beam-out angles of the ray beams can be adjusted by other suitable methods mentioned in the aforementioned embodiments.

[0279] In addition, similar to the above-mentioned embodiment, the ends of the adjacent ray source modules of the ray source of this embodiment may also lack projection data. Figure 19-21 In the illustrated embodiment, the spacing between the target points at the adjacent ends of the ray source modules 31 and 33 and the adjacent ends of the ray source modules 33 and 32 may be greater than the spacing between the target points in each ray source, and therefore, projection data is missing at these ends. Therefore, similar to the aforementioned embodiment, the image processing module of the ray scanning device of this embodiment is also configured to have a data compensation function, which can compensate for the missing data of the viewing angle and / or repair the reconstructed image to improve the image quality. The image processing module of the ray scanning device of this embodiment uses the same method as the aforementioned embodiment to reconstruct the image.

[0280] Of course, according to other embodiments, since the ray source modules 31, 32 and the ray source module 33 are arranged in different planes perpendicular to the conveying direction of the detected object, the adjacent ends of the ray source modules 31, 33 and / or the adjacent ends of the ray source modules 33, 32 can be arranged to overlap along the conveying direction of the detected object, so that the target points at the adjacent ends of the adjacent ray source modules 31, 33 or 32, 33 overlap, or the target point spacing is not greater than the spacing between the target points in each ray source. In this case, there is no missing projection data, and accordingly, there is no need to use the data compensation function of the image processing module to perform image reconstruction.

[0281] In addition to having the same advantages as the ray scanning device of the aforementioned embodiment, the ray scanning device of this embodiment also has the following advantages.

[0282] In this embodiment, the ray source and detector only surround the scanning area on three sides. Compared with the case where the scanning area is surrounded on four sides (which can be one or both of the ray source and the detector), sufficient data can be obtained for image reconstruction, and the equipment cost and weight can be reduced, thereby providing a lightweight ray scanning device.

[0283] In addition, this embodiment individually enables the ray source module on one side of the scanning area to face the detector crystal of the detector, so that the rays of the ray source module can cover more detector units, which is beneficial to increase the data volume and improve the image quality.

[0284] The above describes a ray scanning device in which the ray source surrounds the scanning area on four sides or any three of them. According to other embodiments, the ray source can also be arranged to surround the scanning area on only any two of the four sides.

[0285] The above describes the installation and positioning structure of each ray source module used for the ray source. The above installation and positioning structure is not limited to use in the ray scanning device of the present application, but can also be used in other suitable ray scanning devices.

[0286] Various mounting and fixing structures for the detector group are described above. The above mounting and fixing structures are not limited to use in the ray scanning device of the present application, but can also be used in other suitable ray scanning devices. The mounting and fixing structures of each embodiment can be used alone or in combination in a single ray scanning device.

[0287] The above description of the present application is for the purpose of explanation and description, not for exhausting the present application or limiting the present application to the exact form described. There may be many modifications or changes without departing from the scope of the inventive principles of the present application. The described embodiments are intended to best explain the principles of the present application and its practical application. The above description enables other persons skilled in the art to better utilize and practice the various embodiments and various modifications of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A mounting and fixing structure for a detector of a ray scanning device, the ray scanning device comprising the detector and a fixedly arranged support frame, the detector comprising one or more detector groups, the detector groups being fixedly mounted on the support frame or detached from the support frame via the mounting and fixing structure, the mounting and fixing structure comprising: A first mounting portion, which is fixedly disposed on the detector group; a second mounting portion, which is fixedly arranged on the support frame and can cooperate with the first mounting portion in a linear motion, and the detector group can move along the second mounting portion from the outside of the ray scanning device to a predetermined mounting position in the ray scanning device when the first mounting portion and the second mounting portion cooperate with each other; as well as A fixing device is arranged on one side of the detector group along the width direction, and is used to fix the detector group relative to the mounting reference surface on the support frame, wherein the width direction of the detector group is parallel to the conveying direction of the detected object in the ray scanning device, The first mounting portion is formed as a fixing block fixed on the one side of the detector group in the width direction, and the fixing block has an opening facing one side of the detector group in the thickness direction. The second mounting portion is formed as a cantilever portion fixed on the support frame, and an extension portion is provided on the end of the cantilever portion away from the support frame, and the extension portion can be linearly moved and matched with the opening of the fixing block. The fixing device comprises a fixing member and a fastener arranged on the supporting frame, an end surface of the fixing member away from the supporting frame is formed as the installation reference surface for abutting against the surface of the one side of the detector group along the width direction, and the fastener is used to fasten the detector group relative to the end surface of the fixing member, The extension portion can relatively move from the edge of the opening of the fixing block to the inside of the opening and abut against the bottom of the opening so that the detector group moves to the predetermined installation position, and The fastener can pass through the fixing member and enter the detector group to be fastened to the fixing member and the detector group.

2. The mounting and fixing structure according to claim 1, wherein: When the first mounting portion is matched with the second mounting portion, the cantilever portion supports the detector group at the predetermined mounting position through the fixing block.

3. A ray scanning device, comprising a detector and a fixed support frame, wherein the detector comprises one or more detector groups, and the detector groups are mounted and fixed to the support frame or removed from the support frame through a mounting and fixing structure as described in any one of claims 1 to 2.

4. The ray scanning device according to claim 3, wherein: The width direction of the detector group is parallel to the conveying direction of the detected object, and the length direction and thickness direction of the detector group are perpendicular to the conveying direction of the detected object. The conveying direction of the detected object is the direction in which the detected object is conveyed through the scanning area of ​​the X-ray scanning device.

5. The ray scanning device according to claim 4, wherein: In the case where the detector includes a plurality of detector groups, the mounting reference planes for each of the plurality of detector groups are located in the same plane perpendicular to the conveying direction of the detected object.

6. The ray scanning device according to claim 3 or 4, wherein: The direction in which the first mounting portion moves linearly relative to the second mounting portion is perpendicular to a conveying direction of the detected object.

Images