WO2023280079A1 - 射线扫描设备 - Google Patents
射线扫描设备 Download PDFInfo
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- WO2023280079A1 WO2023280079A1 PCT/CN2022/103432 CN2022103432W WO2023280079A1 WO 2023280079 A1 WO2023280079 A1 WO 2023280079A1 CN 2022103432 W CN2022103432 W CN 2022103432W WO 2023280079 A1 WO2023280079 A1 WO 2023280079A1
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- radiation source
- ray
- conveying direction
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- G01V5/226—
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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Definitions
- the application belongs to the field of data radiation imaging, and in particular relates to a ray scanning device.
- the embodiment of the present application provides a ray scanning device, which can solve the problem of poor reliability and maintainability caused by the concentration of multiple ray sources in a single annular closed cavity.
- each detector group of the detector can be multiple The ray source modules are shared, thereby reducing the equipment cost.
- the detector can be easily replaced or maintained while shortening the coverage of the optical path as much as possible, and at the same time, the inclination angle between the center of the ray beam and the surface of the detector can be reduced. to improve image quality.
- the embodiment of the present application provides a radiation scanning device, which includes: a conveying device, which transports an object to be detected through the scanning area of the radiation scanning device; a radiation source, which includes a plurality of radiation source modules, each of which The source module includes at least one ray source point that emits a ray beam, and a 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 detected object; and a detector, which is used for detecting The ray that passes through the detected object is transmitted during scanning and includes a plurality of detector groups whose ends are connected to each other to be arranged around the scanning area, and the plurality of detector groups are fixed perpendicular to the conveying direction of the detected object In the plane; wherein, the detector is located between the radiation source and the scanning area along the vertical direction of the conveying direction of the detected object, the radiation source and the detector are arranged to at least partially overlap along the conveying direction of the detected object,
- the radiation scanning device In the radiation scanning device according to this embodiment, only the radiation source module is arranged around the scanning area above the conveying device, the radiation source module is not arranged below the conveying device, and the detector is arranged around the scanning area.
- a radiation scanning device can reduce the The high height facilitates the transfer of the detected object to the transmission device of the ray scanning equipment, and can reduce the manufacturing cost while ensuring the image quality.
- the radiation source module is a distributed multi-point source, and multiple radiation source modules surround the scanning area to form a non-closed structure with an opening below the conveying device.
- each of the multiple ray source modules is a linear distributed multi-point source
- the multiple linear distributed multi-point sources are arranged on the upper side, the left side and the right side of the scanning area, wherein the multiple linear distributed multi-point sources The ends of the sources are directly connected or spaced apart.
- the plurality of ray source modules includes a plurality of first distributed multipoint sources and a plurality of second distributed multipoint sources, and a plurality of first distributed multipoint sources and a plurality of second distributed multipoint sources Arranged alternately, and the ends are directly connected or arranged at intervals.
- the first distributed multipoint source is a straight line distributed multipoint source
- the second distributed multipoint source is a straight line distributed multipoint source or an arc distributed multipoint source shorter in length than the first distributed multipoint source.
- each of the plurality of ray source modules is a single-point source group, and the plurality of single-point source groups are arranged at least on the left viewing angle, the right viewing angle, the top viewing angle and the corner oblique viewing angle above the conveying device, and each A single point source group includes at least two single point sources.
- each radiation source module has an independent cavity for accommodating a respective radiation generating device.
- the individual cavity of each radiation source module is provided with a mounting and positioning structure, which is used to install and position the radiation source module, and is used to rotate the radiation source module to adjust the beam-out angle of the radiation beam.
- 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, rectangular structure, polygonal structure or elliptical structure surrounding the scanning area.
- each detector group is a linear detector array
- 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.
- 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, and the second linear detector array detects more than the first linear detector arrays.
- the detector array is short, and the first linear detector array and the second linear detector array are alternately arranged around the scanning area to form a polygonal structure.
- individual detector groups of detectors are detachable and installable independently of each other.
- each detector group of the detector is configured to move along the conveying direction of the object to be detected for disassembly and installation.
- each detector group of the detector is configured such 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 a direction perpendicular to the conveying direction of the detected object for disassembly and installation. Install.
- each detector group of the detector includes a detector arm
- the radiation scanning device includes a support frame fixed relative to the installation platform of the radiation scanning device, and the detector group moves along the conveying direction of the detected object or is detected by the detector arm. A movement perpendicular to the conveying direction of the object is detected to be attached to or detached from the support frame.
- each detector group of the detector is configured to avoid the radiation beam of the radiation source module on the same side and receive radiation from all the radiation source modules on the same side except the radiation source module on the same side.
- each detector unit of the detector group includes a detector crystal for receiving rays transmitted through the object to be detected during scanning, the detector crystal being arranged at the side of the detector unit along the direction of conveyance of the object to be detected. end, and arranged to be close to the edge of the radiation beam of the radiation source module on the same side in the conveying direction of the detected object, but not to block the radiation beam.
- the respective radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.
- each radiation source module is configured to rotate around the target axis so that the central position of the radiation beam irradiates the detector crystals of the detector group on the opposite side.
- the radiation scanning device further includes an image processing module configured to perform data compensation and/or reconstructed image restoration for missing projection data at the end of the radiation source module to obtain a complete reconstructed image.
- the image processing module is configured to perform image reconstruction by an iterative method, an image threshold inpainting method, or a combination of both.
- the embodiment of the present application also provides a radiation scanning device, including: a conveying device, which transports the detected object through the scanning area of the radiation scanning device; a radiation source, which includes a plurality of radiation source modules, and each radiation
- the source module includes at least one ray source point for emitting ray beams, and a plurality of ray source modules are arranged around the scanning area in a non-closed structure with openings on the left or right side of the scanning area, and are fixed in a direction perpendicular to the conveying direction of the detected object.
- a detector for detecting rays transmitted through the detected object during scanning including a plurality of detector groups whose ends are connected to each other so as to be arranged around the scanning area, and the plurality of detectors
- the group is fixed in a plane perpendicular to the conveying direction of the detected object, wherein the detector is located between the ray source and the scanning area along the vertical direction of the conveyed direction of the detected object, and the ray source and the detector are arranged along the direction of the detected object
- the conveying directions are at least partially overlapped, and multiple radiation source modules can be disassembled and installed independently of each other.
- the ray source modules are arranged around the scanning area on the upper side, the lower side, and the left or right side of the scanning area, and the detectors are arranged around the scanning area.
- Such a ray scanning device is suitable for detecting Airport carry-on luggage, taking advantage of the characteristics of large width and small thickness of airport carry-on luggage, and considering the influence of luggage item self-occlusion and ray attenuation on projection data, can reduce manufacturing costs while ensuring high image quality.
- the ray source module is a distributed multi-point source, and multiple ray source modules surround the scanning area to form an open structure opening on the left or right side of the scanning area.
- each of the plurality of ray source modules is a linear distributed multi-point source
- the plurality of linear distributed multi-point sources are respectively arranged on the upper side, the lower side, and the left or right side of the scanning area to form a linear distributed multi-point source.
- the plurality of ray source modules includes a plurality of first distributed multipoint sources and a plurality of second distributed multipoint sources, and a plurality of first distributed multipoint sources and a plurality of second distributed multipoint sources Arranged alternately, and the ends are directly connected or arranged at intervals.
- the first distributed multipoint source is a straight line distributed multipoint source
- the second distributed multipoint source is a straight line distributed multipoint source or an arc distributed multipoint source shorter in length than the first distributed multipoint source.
- each of the multiple ray source modules is a single-point source group
- the multiple single-point source groups are arranged at least on the top viewing angle, the bottom viewing angle, the left viewing angle or the right viewing angle, and at least part of the corner oblique viewing angles of the scanning area.
- each single-point source group includes at least two single-point sources.
- each radiation source module has an independent cavity for accommodating a respective radiation generating device.
- the chamber of each radiation source module includes a separate vacuum chamber for accommodating multiple targets.
- the spacing between the target points in each radiation source module is smaller than the spacing between the target points at the ends of adjacent radiation source modules.
- the individual cavity of each radiation source module is provided with a mounting and positioning structure, which is used to install and position the radiation source module, and is used to rotate the radiation source module to adjust the beam-out angle of the radiation beam.
- 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, rectangular structure, polygonal structure or elliptical structure surrounding the scanning area.
- each detector group is a linear detector array
- 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.
- 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, and the second linear detector array detects more than the first linear detector arrays.
- the detector array is short, and multiple first linear detector arrays and multiple second linear detector arrays are alternately arranged around the scanning area to form a polygonal structure.
- individual detector groups of detectors are detachable and installable independently of each other.
- the detector groups at the upper and lower sides of the scanning area and the opening of the radiation source structure are configured to move perpendicular to the conveying direction of the object to be detected for disassembly and installation, and the detection at the opposite side of the radiation source structure opening
- the device group is configured to move along the conveying direction of the object to be detected for disassembly and installation.
- each detector group of the detector includes a detector arm
- the radiation scanning device includes a support frame fixed relative to the installation platform of the radiation scanning device
- the detector group is mounted to or detached from the support frame via the detector arm .
- each detector group of the detector is configured to avoid the radiation beam of the radiation source module on the same side and receive radiation from all the radiation source modules on the same side except the radiation source module on the same side.
- each detector unit of the detector group includes a detector crystal for receiving rays transmitted through the object to be detected during scanning, the detector crystal being arranged at the side of the detector unit along the direction of conveyance of the object to be detected. end, and arranged to be close to the edge of the radiation beam of the radiation source module on the same side in the conveying direction of the detected object, but not to block the radiation beam.
- the respective radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.
- each radiation source module is configured to rotate around the target axis so that the central position of the radiation beam irradiates the detector crystals of the detector group on the opposite side.
- the radiation scanning device further includes an image processing module configured to perform data compensation and/or reconstructed image restoration for missing projection data at the end of the radiation source module to obtain a complete reconstructed image.
- the image processing module is configured to perform image reconstruction by an iterative method, an image threshold inpainting method, or a combination of both.
- the embodiment of the present application also provides a ray scanning device, which includes a conveying device, which transports the detected object through the scanning area of the ray scanning device; a ray source, which includes a plurality of ray source modules, and each ray
- the source module includes at least one ray source point that emits a ray beam, and viewed along the conveying direction of the object to be detected, a plurality of ray source modules are arranged around the scan area in a non-closed structure with an opening on one side of the scan area; and a detector, which It is used to detect the rays transmitted through the detected object during scanning and includes a plurality of detector groups, viewed along the conveying direction of the detected object, the ends of the plurality of detector groups are connected to each other and opened on one side of the scanning area
- the non-closed structure is arranged around the scanning area, wherein the opening of the non-closed structure of the radiation source and the opening of the non-closed structure of the detector are arranged oppositely, and a
- both the radiation source and the detector surround the scanning area on only three sides, as opposed to surrounding the scanning area on four sides (either one or both of the radiation source and the detector).
- enough data can be obtained for image reconstruction, and the cost and weight of the equipment can be reduced, so that light-weight ray scanning equipment can be provided.
- the radiation source module and the plurality of detector groups of the detector are fixed on the same plane perpendicular to the conveying direction of the detected object, and the other parts of the radiation source
- the ray source module is fixed in another plane perpendicular to the conveying direction of the detected object.
- other radiation source modules of the radiation source are fixed in another same plane perpendicular to the conveying direction of the detected object.
- a plurality of radiation source modules can be disassembled and installed independently of each other.
- each of the plurality of ray source modules is a distributed multi-point source, viewed along the conveying direction of the object to be detected, the plurality of distributed multi-point sources are respectively arranged on three sides of the scanning area to form a ray surrounding the scanning area A non-enclosed structure that is open on one side.
- 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 in the shape of a right-angled rectangle or a rounded rectangle with an opening on one side of the scanning area viewed from the conveying direction of the detected object , polygonal or elliptical structures.
- 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.
- each radiation source module has an independent cavity for accommodating a respective radiation generating device.
- the chamber of each radiation source module includes a separate vacuum chamber for accommodating multiple targets.
- the spacing between the target points in each radiation source module is smaller than the spacing between the target points at the ends of adjacent radiation source modules.
- the individual cavity of each radiation source module is provided with a mounting and positioning structure, which is used to install and position the radiation source module, and is used to rotate the radiation source module to adjust the beam-out angle of the radiation beam.
- each detector group is a detector array including a plurality of detector units, and the detector array includes a linear detector array, an arc detector array, or a combination of both.
- each detector group is a linear detector array
- the detector includes three linear detector arrays, and the three linear detector arrays are respectively arranged on three sides of the scanning area, forming an opening on one side of the scanning area. Rectangular or square structure.
- 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, and the second linear detector array detects more than the first linear detector arrays.
- the detector array is short, and multiple first linear detector arrays and multiple second linear detector arrays are alternately arranged around the scanning area to form a polygonal structure with an opening on one side of the scanning area.
- individual detector groups of detectors are detachable and installable independently of each other.
- the detector group of the detector is configured to move perpendicularly or parallel to the conveying direction of the detected object for disassembly and installation.
- each detector group of the detector includes a detector arm
- the radiation scanning device includes a support frame fixed relative to the installation platform of the radiation scanning device
- the detector group is mounted to or detached from the support frame via the detector arm .
- the detector viewed from the conveying direction of the detected object, is arranged between the radiation source and the scanning area; and along the conveying direction of the detected object, other radiation source modules at least partially overlap with the detector group on the same side.
- the detector group of the detector on the same side as other radiation source modules is configured to avoid the radiation beams of the radiation source modules on the same side and receive radiation beams from all radiation source modules on the same side except the radiation source modules on the same side. Rays.
- each detector unit of the detector group includes a detector crystal for receiving radiation transmitted through the detected object during scanning, and the detector crystal is arranged in the direction of conveyance of the detected object along the direction of the detector unit
- the end of the detector and the detector crystals of the detector group on the same side as other radiation source modules are arranged to be close to the edge of the radiation beam of the radiation source module on the same side in the conveying direction of the object to be detected, but not to block the radiation beam.
- the other radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.
- the other radiation source module is configured to rotate around the target axis so that the central position of the radiation beam irradiates the detector crystals of the detector group on the opposite side.
- the radiation scanning device further includes an image processing module configured to perform data compensation and/or reconstructed image restoration for missing projection data at the end of the radiation source module to obtain a complete reconstructed image.
- the image processing module is configured to perform image reconstruction by an iterative method, an image threshold inpainting method, or a combination of both.
- the embodiments of the present application provide an installation and positioning structure of a radiation source of a radiation scanning device.
- the radiation scanning device includes a radiation source and a fixed support frame.
- the installation and positioning structure includes a main body that can be fixedly connected to the radiation source and a supporting frame, so that the radiation source can be fixedly installed on the supporting frame through the main body, and the installation and positioning structure also includes: a moving device, the radiation source can be moved to a predetermined installation position on the first plane by the moving device; a first positioning device, which used for positioning the radiation source on the first plane; the lifting device, which is used to adjust the position of the radiation source along the first direction, wherein the first direction is perpendicular to the first plane; and the second positioning device, which is used for One direction fixes the position of the ray source.
- each radiation source module of the radiation source can be disassembled and installed separately, and the beam output angle of the radiation source module can also be adjusted.
- the moving device includes rollers arranged at both ends of the radiation source along the length direction.
- the first positioning device includes a first positioning pin and a first pin hole corresponding to the first positioning pin provided on the main body and the support frame.
- the lifting device is arranged at both ends of the radiation 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 jack wire.
- the second positioning device is formed as a positioning spacer, and the positioning spacer is placed under the main body after the radiation source is adjusted to a predetermined position along the first direction by the lifting device.
- the installation and positioning structure further includes: an adjustment device, which is used to rotate the radiation source along a predetermined axis to adjust the beam output angle of the radiation source.
- the radiation source is provided with an installation shaft, and the main body is provided with a corresponding shaft hole, and the main body is installed on the installation shaft of the radiation source through the shaft hole;
- the positioning installation structure also includes a positioning piece and a fastener, and the main body is positioned The cooperation between the fitting and the shaft hole and the installation shaft is positioned relative to the radiation source, and is fixedly connected to the radiation source through a fastener;
- the adjustment device includes a rotating drive device, which can be driven when the positioning member and the fastener are loosened.
- the ray source rotates around the installation axis.
- the rotation driving device includes an adjustment block fixed on the radiation source and a top wire provided on the main body that abuts against the adjustment block, and the top wire can be rotated to push the adjustment block to move so as to rotate the radiation source.
- the positioning member includes a second positioning pin and a corresponding second pin hole formed on the main body and the radiation source
- the fastener includes a fixing bolt and a corresponding threaded hole formed on the main body and the radiation source.
- a radiation scanning device which includes a radiation source and a fixed support frame, and the radiation source is fixedly installed on the support frame via the installation and positioning structure of any of the above embodiments.
- the radiation scanning device rotates the radiation source by installing the positioning structure to adjust the beam output angle of the radiation source.
- the embodiment of the present application also provides an installation and fixing structure for a detector of a radiation scanning device.
- the radiation scanning device includes a detector and a fixed support frame, and the detector includes one or more detector groups , the detector group is fixedly installed on or removed from the support frame via the installation and fixing structure.
- the installation and fixing structure includes: a first installation part, which is fixedly arranged on the detector group; a second installation part, which is fixedly arranged on the support on the frame and can move linearly with the first installation part, and the detector group can move to a predetermined installation position along the second installation part under the condition that the first installation part and the second installation part cooperate with each other; and the fixing device, which is arranged on One side of the detector group along the width direction is used for fixing the detector group relative to the installation reference plane on the support frame.
- each detector group of the detector can be disassembled and installed separately, and can be disassembled and maintained without disassembling the radiation source module when it is arranged inside the radiation source module, which improves the detection efficiency.
- the second installation part is further configured to support the detector group at a predetermined installation position in a state of being matched with the first installation part.
- the first installation part includes a slider extending along the length direction of the detector group, and the second installation part includes a fixed guide rail matched with the slider.
- the fixing device includes a fastener and a positioning piece arranged on the support frame, and the end surface of the positioning piece away from the support frame is formed as an installation reference surface for abutting against one side of the detector group along the width direction.
- the fastener passes through the positioning member and fastens the detector group relative to the end surface of the positioning member.
- the sliders are arranged on opposite sides of the detector group along the width direction, and have inner extensions extending inward from the edges of the detector group on opposite sides along the width direction; The outwardly extending extensions on opposite sides in the width direction; in the state where the first installation part is matched with the second installation part, the inner extension of the slider is located above the outer extension of the fixed guide rail and the two are in contact and overlapped , to hang the detector group on the fixed rail.
- the stationary rail supports the slider underneath the slider.
- the first mounting part is formed as a sliding groove extending along the width direction of the detector group, and the second mounting part is formed as a sliding rod matched with the sliding groove.
- a convex portion is formed at one end of the sliding rod close to the support frame, and the surface of the convex portion facing the detector group is formed as an installation reference surface for abutting against the surface on the other side of the detector group along the width direction.
- the fixing device is arranged at the other end of the sliding rod opposite to the convex portion, and is arranged to abut against the convex portion on both sides in the width direction of the detector group respectively.
- the fixing device includes a positioning sleeve and a fastener, the positioning sleeve is sleeved on the other end of the slide bar and abuts against one side of the detector along the width direction, and the fastener is used to fix the positioning sleeve to the slide on the other end of the rod.
- the second installation part includes two sliding rods
- the first installation part includes two slide slots formed at both ends of the detector group along the length direction
- the two slide bars and the two slide slots are connected to each other respectively. Cooperate to set the detector at the intended installation position.
- the first mounting part is formed as a fixed block fixed on one side of the detector group along the width direction, and the fixed block has an opening toward one side of the thickness direction of the detector group;
- the second mounting part is formed as The cantilever part fixed on the support frame is provided with an extension part on the end part of the cantilever part far away from the support frame, and the extension part can linearly move and cooperate with the opening of the fixed block.
- the fixing device includes a fixing piece and a fastening piece arranged on the supporting frame, and the end surface of the fixing piece away from the supporting frame is formed as an installation reference plane for abutting against one side of the detector group along the width direction. surface, and the fastener is used to fasten the detector group relative to the end face of the fixture.
- the cantilever part in a state where the first installation part is mated with the second installation part, supports the detector group at a predetermined installation position through the fixing block.
- a radiation scanning device which includes a detector and a fixed support frame, the detector includes one or more detector groups, and the detector groups are installed and fixed by the installation and fixing structure of any of the above embodiments to or from the supporting frame.
- the width direction of the detector group is parallel to the conveying direction of the detected object
- the length direction and the thickness direction of the detector group are perpendicular to the conveying direction of the detected object
- the conveying direction of the detected object is when the detected object is conveyed The direction of the scan area of the device through the ray scan.
- 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.
- the direction in which the first mounting part moves linearly relative to the second mounting part is parallel to or perpendicular to the conveying direction of the object to be detected.
- FIG. 1 shows a schematic structural diagram of a radiation scanning device provided according to some embodiments of the present application
- FIG. 2 shows a schematic structural diagram of a radiation source and a detector according to the radiation scanning device shown in FIG. 1;
- Fig. 3 shows a schematic diagram of the beam shape of the radiation source provided according to some embodiments of the present application
- Fig. 4 shows a schematic diagram of the distribution of radiation sources in the form of targets according to some embodiments of the present application
- Fig. 5 is a schematic diagram of the installation and positioning structure of the radiation source module provided according to some embodiments of the present application.
- Fig. 6 is a schematic diagram of the distribution of detectors according to some embodiments of the present application.
- Fig. 7 is a schematic structural diagram of a linear detector group according to some embodiments of the present application.
- Fig. 8 is a schematic structural diagram of a detector unit according to some embodiments of the present application.
- Fig. 9 is a schematic diagram of the installation and fixing structure of the detector group according to some embodiments of the present application.
- Fig. 10 is a schematic diagram of the corresponding relationship between the radiation source module and the detector group receiving its radiation according to some embodiments of the present application;
- Fig. 11 is a schematic cross-sectional structural diagram of the radiation scanning device shown in Fig. 1 along the centerline of the conveying direction of the detected object according to some embodiments of the present application;
- Fig. 12 is a schematic top view of the layout of detectors and radiation sources according to some embodiments of the present application.
- Fig. 13 is a combined schematic diagram of a detector and a radiation source according to some embodiments of the present application.
- Fig. 14 is a schematic diagram of the disassembly direction of the detector group in the combination of the detector and the radiation source shown in Fig. 13 according to some embodiments of the present application;
- Fig. 15 is a mounting and fixing structure suitable for detector groups according to some embodiments of the present application.
- Fig. 16 is a mounting and fixing structure suitable for detector groups according to other embodiments of the present application.
- Fig. 17 is a mounting and fixing structure suitable for detector groups according to some other embodiments of the present application.
- Fig. 18 is a schematic diagram of arrangement of radiation sources and detectors of a radiation scanning device according to some embodiments of the present application.
- Fig. 19 is a perspective schematic diagram of a layout of radiation sources and detectors of a radiation scanning device according to some embodiments of the present application.
- Fig. 20 is a side view of the radiation source and detector layout of the radiation scanning device shown in Fig. 19 along the Z-axis direction;
- Fig. 21 is a top view schematic diagram of the radiation source and detector layout of the radiation scanning device shown in Fig. 19;
- Fig. 22 is a schematic diagram of the distribution of a single point source of a radiation source of a radiation scanning device according to some embodiments of the present application.
- Fig. 23 is a schematic structural diagram of a detector of a radiation scanning device according to some embodiments of the present application.
- Fig. 24 is a schematic view of the detachment direction of the detector according to some embodiments of the present application.
- the static CT (distributed multi-point source) or multi-viewpoint (single-point source) device in the above-mentioned background technology usually includes multiple planar light paths, and the multiple planar light paths are along the length direction of the device (that is, the conveying direction of the detected object) arranged.
- This arrangement leads to a long coverage of the optical path of the static CT (distributed multi-point source) or multi-viewpoint (single point source) equipment, which is not conducive to shortening the length of the whole machine and reducing the weight of the whole machine.
- 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 in the whole machine, which is not conducive to reducing the cost of the whole machine equipment.
- the arrangement of the ray source ring and the detector ring can ensure that a single detector is shared by multiple ray sources, it still does not solve the problem of concentrating the ray sources on The problems of poor reliability and maintainability caused in a single annular closed cavity.
- the detector can only be replaced or maintained from the inside of the ring, and the maintainability of the detector is poor.
- the detector can be replaced or maintained from the outside of the ring, and this arrangement will increase the coverage of the optical path, resulting in an increase in the length of the device.
- There is an inclination angle with the surface of the detector crystal and the ray beam obliquely hits the detector crystal, which affects the image quality.
- an embodiment of the present application provides a radiation scanning device, which includes: a conveying device, which transports the detected object through the scanning area of the radiation scanning device; a radiation source, which includes a plurality of radiation source modules , each ray source module includes at least one ray source point that emits a ray beam, a plurality of ray source modules are arranged around the scanning area, and are fixed in a plane perpendicular to the conveying direction of the detected object; and a detector, which is used for detecting The ray that passes through the object to be inspected is transmitted during scanning and includes a plurality of detector groups whose ends are connected to each other to be arranged around the scanning area, and the plurality of detector groups are fixed in a direction perpendicular to the conveying direction of the object to be inspected.
- the detector is located between the radiation source and the scanning area along the vertical direction of the conveying direction of the detected object, the radiation source and the detector are arranged to at least partially overlap along the conveying direction of the detected object, and a plurality of radiation source modules Can be removed and installed independently of each other.
- the radiation source is formed by arranging a plurality of radiation source modules around the scanning area, and the plurality of radiation source modules can be disassembled and installed independently of each other, that is, each radiation source module has a separate cavity To accommodate their respective radiation generating devices.
- the radiation source formed by the combination of multiple radiation source modules of the present application can reduce the shell size of a single radiation source module and the volume of the internal vacuum cavity, so that the volume of a single radiation source module is small,
- the light weight makes it easy to disassemble and install the radiation source; in addition, multiple targets of a single radiation source module can use separate vacuum chambers, thus reducing the risk of ignition in the chamber during maintenance of the radiation source.
- the individual cavity of each radiation source module is provided with a mounting and positioning structure, and the mounting and positioning structure is used to fix the radiation source module at a relative position in the radiation scanning device, for example, positioning the radiation source relative to the support frame
- the module is also used to rotate the ray source module around a predetermined axis to adjust the beam-out angle of the ray beam.
- the position of each radiation source module can be determined, so as to ensure that a plurality of radiation source modules of the radiation 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). in plane).
- the radiation source module may be a distributed multi-point source to form a ring structure around the scanning area, such as a rectangular ring, a polygonal ring, or an elliptical ring.
- the ray source module can be a linear distributed multi-point source, each ray source module can include multiple target points, and the 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 scan area.
- the ends of the radiation source modules can be directly connected to form a continuous rectangular ring, or can be separated by a certain gap to form a discontinuous rectangular ring.
- the ray source may further include a plurality of shorter linear distributed multi-point sources, and the plurality of shorter linear distributed multi-point sources may be alternated with a plurality of longer linear distributed multi-point sources set, and the ends are directly connected to form a continuous polygonal arrangement, or the ends are arranged at intervals to form a non-continuous polygonal arrangement; or, the ray source can further include a plurality of arc-shaped distributed multi-points with shorter lengths Sources, multiple arc-shaped distributed multi-point sources can be alternately arranged with multiple longer straight-line distributed multi-point sources, and the ends are directly connected to form a continuous rounded rectangular arrangement, or the ends are arranged at intervals A discontinuous rectangular arrangement with rounded corners is formed; alternatively, the ray source may also include ray source modules of other numbers, shapes and/or lengths to form other polygonal or elliptical structures.
- each ray source module of the ray source can also be a single-point source group, and each single-point source group includes at least two single-point sources.
- multiple single-point source groups of the ray source are distributed around the scanning area Bottom viewing angles, left and right side viewing angles, top viewing angles and corner oblique viewing angles form a multi-viewing angle arrangement.
- the radiation source module can 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 or right side, etc. (here, it should be noted that , in this article, the upper side, lower side, left side and right side of the scanning area refer to the upper side, lower side, left side and right side when viewing the scanning area along the conveying direction of the detected object). Therefore, the ray source can be arranged in a non-closed structure with one side opening around the scanning area, such as a rectangular structure, a polygonal structure, or an elliptical structure with one side opening, and more specifically, it can be a structure with one side opening surrounding the scanning area.
- Discontinuous or continuous rectangular structures continuous polygonal structures, continuous rounded rectangles, discontinuous polygonal or discontinuous rounded rectangular structures, and other polygonal and elliptical structures, etc.
- the ray source is composed of a single point source, correspondingly, no single point source may be provided on one side of the scanning area.
- the detector is a structure surrounding the scanning area formed by connecting the ends of a plurality of detector groups to each other.
- various radiation sources for example, a structure surrounding the scanning area on four sides, up, down, left, and right, or a non-closed structure opening on one side of the scanning area, such as a rectangular structure opening on one side of the scanning area, Polygonal or elliptical structures (more specifically, such as continuous or non-continuous rectangular structures surrounding openings on one side of the scanning area, continuous or non-continuous polygonal structures, continuous or non-continuous rounded rectangular structures, and single-point source multi-angle Arrangement), multiple detector groups of the detector are arranged in a closed rectangular structure, square structure, polygonal structure or elliptical structure, etc.
- each detector group of the detector may include a plurality of detector units and a detector arm, and the plurality of detector units are linearly arranged on the detector arm.
- the detectors may include four detector groups respectively arranged on the upper, lower, left, and right sides of the scanning area to form a closed rectangular or square structure surrounding the scanning area.
- the detectors 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.
- multiple detector groups of the detector in conjunction with the non-closed structure with an opening on one side of the scanning area of the above-mentioned radiation source, multiple detector groups of the detector can also be arranged in a non-closed structure with an opening on one side of the scanning area, for example, one side Open rectangular structure, square structure, polygonal structure or oval structure, etc.
- the plurality of detector groups of the detector are configured to be independently detachable and installable.
- each detector group can be disassembled and installed separately, which facilitates the maintenance of the detectors.
- the plurality of detector groups of the detector can be configured to move along the conveying direction of the object to be detected for assembly and disassembly.
- a part of the multiple detector groups of the detector can be moved along the vertical direction of the conveying direction of the object to be inspected for disassembly, and the other A part moves along the conveying direction of the detected object for disassembly.
- the detector group can be disassembled and maintained without disassembling the radiation source module, thereby Improve the operation convenience of detector disassembly and maintenance.
- the above-mentioned detector group can be disassembled by means of the detector arm of the detector group and its linear movement cooperation between the installation site of the radiation scanning device, such as the support frame of the radiation scanning device, such as linear sliding Or linear rolling fit, etc., for example, it can be the slider guide rail fit between the detector arm and the support frame or the linear ball bearing and the cylindrical shaft fit.
- each detector unit of the detector group includes a detector crystal for receiving radiation, and each detector unit of each detector group is arranged on the detector arm with the detector crystal facing the same direction. to arrange.
- each detector group is located in a plane perpendicular to the conveying direction of the object to be detected, especially 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.
- the detector groups can also be located in different planes perpendicular to the conveying direction of the object to be detected.
- the radiation source of any of the above embodiments is combined with the detector of any of the above embodiments.
- each radiation source module of the radiation source is located perpendicular to the detected In the plane (one or more planes) of the conveying direction of the object
- each detector group of the detector is located in other planes (especially in the same plane) perpendicular to the conveying direction of the detected object
- the detectors are in the conveying direction
- the vertical direction is located inside the radiation source, and the radiation source and the detector are arranged to at least partially overlap in the conveying direction of the object to be detected.
- the at least partial overlap of the radiation source and the detector in the conveying direction of the detected object can reduce the arrangement length of the radiation source and the detector, thereby helping to reduce the length of the entire radiation scanning system.
- 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, and at the same time can receive the ray from each ray source module on the other side, so that different ray source modules share the same Detector groups, which can reduce the total number of detectors.
- 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 object to be detected, and are arranged to be adjacent to the radiation source on the same side in the conveying direction of the object to be detected
- the ray beam of the module is arranged on the edge, but does not block the ray beam of the ray source module on the same side. In this way, the covering length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby further reducing the length of the device.
- each radiation source module is arranged such that the radiation beam avoids the same side detector group and illuminates the detector crystals of the opposite side detector group. More specifically, the ray source module can be rotated relative to a predetermined axis, such as the target axis (for example, by means of the installation and positioning structure of the aforementioned ray source module) to adjust the beam-out angle of the ray beam, so that the center of the ray beam of the ray source module The position illuminates the detector crystals of the opposite side detector set.
- a predetermined axis such as the target axis
- the radiation source module since the detector crystal of the detector is located at the end of the detector unit in the conveying direction of the detected object and is arranged close to the edge of the beam of the radiation source on the same side, the radiation source module only needs to rotate a small angle to make the radiation beam
- the detector crystal is irradiated at the central position of the detector crystal, so that the adverse effect on imaging caused by the ray beam obliquely incident on the surface of the detector crystal can be minimized.
- the adjustment of the beam output angle of the radiation source can also be realized by setting the opening direction of the radiation source module, adjusting the collimator and other suitable methods.
- 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 missing view angle data and/or repair the reconstructed image, so as to improve image quality.
- the image processing module is configured to perform image reconstruction with an iterative method, an image threshold inpainting method or a combination of the two. In this way, the lack of projection data caused by the increased distance between target points at the ends of adjacent ray source modules can be compensated, thereby improving the quality of the reconstructed image.
- Fig. 1 schematically shows a radiation scanning device according to some embodiments of the present application.
- the conveying device 1 is used to transport the detected object 6 through the scanning area of the radiation scanning device, and the scanning area is defined by the radiation source 3 and the detector 4 .
- the object 6 to be detected enters the channel 2 from the opening at one end of the channel 2 and exits from the opening at the other end of the channel 2 driven by the conveying device 1.
- the channel 2 can shield the rays of the radiation source 3 from the external environment, avoiding radiation near the equipment. Radiation damage caused to people, and at the same time, the volume of the detected object 6 entering the channel 2 can also be limited.
- the radiation source 3 is fixed on the supporting frame 5 outside the channel 2, and is used for emitting radiation beams to irradiate the detected object 6 during scanning.
- Detectors 4 are also fixed to the support frame 5 on the outside of the channel 2, which are used to detect the radiation transmitted through the detected object 6 during scanning.
- the support frame 5 is used to support and fix the transmission device 1, the channel 2, the radiation source 3, the detector 4 and other devices, which are 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, in the scanning area, the channel 2 is provided with an avoidance area, which will not block the ray beam of the ray source 3 and will not hinder the detector. 4 Receive rays.
- the radiation scanning device may further include a control device, which can control the operation of various components of the radiation scanning device, for example, control the emission of radiation from the radiation source 3, the data output from the detector 4, and the like.
- the control device can also include an image processing module, which can perform image reconstruction according to the information output by the detector 4 to obtain a scanned image of the detected object 6 .
- the conveying device 1 may be, for example, a conveyor belt; the object to be detected 6 may be, for example, parcels, luggage, and other items that require safety inspection.
- the radiation source 3 may include a plurality of radiation source modules, and each radiation source module is arranged around the scanning area and located in a plane perpendicular to the conveying direction of the detected object 6 .
- Each radiation source module can be arranged in the same plane perpendicular to the conveying direction of the detected object 6 or in different planes.
- each radiation source module is located in the same plane perpendicular to the conveying direction of the detected object 6 (specifically It refers to the fact that the radiation openings of each radiation source module are located in the same plane perpendicular to the conveying direction of the detected object 6) as an example, but it is also applicable to the case where each radiation source module is located on a different plane.
- the advancing direction Z of the detected object 6 is shown in Fig.
- conveying direction or Z direction is defined as the advancing direction of the detected object 6, including the reverse direction of the advancing direction .
- Figure 1 shows the XYZ coordinate system, which can be used as a reference coordinate system to describe the position of the components in the ray scanning device. These position descriptions are for clearly describing the principles of the present application and have no limiting effect.
- the advancing direction Z of the detected object 6 is the same as the Z direction of the XYZ coordinate system.
- each ray source module of the ray source 3 of the ray scanning device may be a distributed multi-point source, and multiple ray source modules may be arranged in a rectangular structure, a polygonal structure, an ellipse, etc. surrounding the scanning area. Shaped structure, etc., wherein part of the structure is located below the conveying device 1 to completely surround the conveying device 1.
- each ray source module can have a plurality of target points, and each target point of each ray source module can independently generate a ray beam, and each target point can be controlled by the control device according to
- the radiation beams are generated in predetermined timing.
- the beam of rays may be a fan beam with an aperture angle A, as shown in FIG. 3 .
- the shape of the ray beam is not limited to a fan beam, and may also be a ray beam of other shapes such as a cone beam and a parallel beam, which may be specifically set as required.
- Fig. 2 shows a schematic structural diagram of a radiation source and a detector according to some embodiments, where multiple radiation source modules of the radiation source 3 are arranged in a rectangular structure surrounding a scanning area.
- the ray source 3 includes four ray source modules 31, 32, 33, 34, each ray source module is a linear distributed multi-point source (that is, multiple target points are arranged in a straight line), 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 radiation source modules 31 , 32 , 33 , 34 are spaced apart by a certain distance, thus forming a non-continuous rectangular structure (as shown in (a) of FIG. 4 , the target points are also arranged in a non-continuous rectangular structure).
- the arrangement of the radiation source 3 is not limited to the embodiments shown in FIG. 2 and (a) of FIG. 4 , and may also include some other alternative arrangements.
- the ends of the ray source modules 31, 32, 33, and 34 can be directly connected so that the ray source 3 is arranged around the scanning area in a continuous rectangular structure (as shown in (b) of FIG. rectangular arrangement).
- the ray source 3 is arranged around the scanning area in a continuous rectangular structure (as shown in (b) of FIG. rectangular arrangement).
- the radiation source 3 may also include four other linear distributed radiation source modules 35, 36, 37, 38, whose length is shorter than that of the radiation source modules 31, 32, 33, 34, Alternately arranged with the radiation source modules 31, 32, 33, 34 and the ends are directly connected, so that the radiation sources 3 are arranged in a continuous polygonal structure (as shown in (c) of FIG. 4, the target points are arranged in a continuous polygonal shape).
- the ray source modules 35, 36, 37, 38 may be arc-shaped distributed ray sources, arranged alternately with the ray source modules 31, 32, 33, 34 and directly connected at the ends, so that the ray source 3 forms a continuous rounded rectangle structural arrangement.
- the ends of the ray source modules 31, 32, 33, 34, 35, 36, 37, 38 can also be spaced at a certain distance, so that the ray source 3 is arranged in a discontinuous polygonal structure or a discontinuous rounded rectangular structure (attached not shown in the figure).
- the length of the radiation source modules 35, 36, 37, 38 can be the same as or longer than the length of the radiation source modules 31, 32, 33, 34, or the radiation source 3 can include other numbers (multiple) and/or lengths
- the ray source module forms a polygonal structure different from the polygon shown in (c) of FIG. 4 .
- the radiation source 3 may include radiation source modules of other numbers (multiples), lengths and/or shapes, so as to form an elliptical structure.
- the radiation source modules included in the radiation source 3 are detachable and installable independently of each other, that is, each radiation source module has a separate cavity for accommodating its own radiation generating device.
- Each radiation source module has an independent chamber, which means that multiple targets of each radiation source module share a single vacuum chamber.
- the distance between multiple target points of each radiation 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 radiation source module may be 192, 264, etc., and the distance between target points in a single radiation source module may be 4 mm, 12 mm, etc.
- each ray source module has a separate cavity and has the following advantages: compared with the ray source of the integrated annular cavity (that is, all the target points of the ray source are located in the same annular vacuum cavity), the size of a single ray source module can be reduced.
- each radiation source module uses a separate vacuum chamber, which can reduce the impact on the radiation source. Risk of sparking in the cavity when the module is being serviced.
- each radiation source module of the radiation source 3 is provided with an installation and positioning structure, so as to facilitate the installation and adjustment of the radiation source modules.
- each radiation source module of the radiation source 3 can be installed and fixed at a predetermined position in the radiation scanning device (for example, at a specific position in the radiation scanning device relative to the XYZ reference coordinate system), for example to ensure Multiple radiation source modules are located in the same plane perpendicular to the conveying direction of the detected object 6 .
- the radiation source module can also be rotated to adjust the beam-out angle of the radiation beam.
- Each radiation source module of the radiation source 3 may adopt different installation methods due to different positions in the radiation scanning device, and have different installation and positioning structures.
- the ray source modules located above and to the side of the scanning area can be installed in a hoisting manner through equipment such as a crane.
- the ray source module located below the scanning area is not suitable for hoisting, and needs to be installed in other ways.
- embodiments of the present application provide an installation and positioning structure, which can easily install and fix radiation source modules that are not suitable for hoisting at a predetermined position of the radiation scanning equipment, and can also Rotate the ray source module to adjust the beam-out angle of the ray beam.
- the installation and positioning structure includes a main body, which can be fixedly connected to the support frame of the radiation source module and the radiation scanning device, so that the radiation source module can be fixedly installed on the support frame through the main body, wherein the installation and positioning structure includes: A moving device, by which the radiation source module can be moved to a predetermined installation position on a first plane (for example, the XZ plane in Fig. 1 ); a first positioning device, which positions the radiation source module on the first plane a lifting device, which is used to adjust the position of the ray source module along a first direction (for example, the Y direction in FIG. 1 , which is perpendicular to the XZ plane), wherein the first direction is perpendicular to the first plane; and a second positioning device, It is used to fix the position of the radiation source module in the first direction.
- a moving device by which the radiation source module can be moved to a predetermined installation position on a first plane (for example, the XZ plane in Fig. 1 );
- Fig. 5 shows a specific embodiment of the installation and positioning structure of the radiation source module.
- the mounting and positioning structure includes main bodies 11, 12, the main bodies 11, 12 are respectively located at both ends of the radiation source module along the length direction, and are fixedly connected to the radiation source module (here, the radiation source module is shown in Fig. 2
- the ray source module 33 of the ray source 3 is described as an example, and it can also be other suitable ray source modules), the ray source module 33 is fixedly installed on the support frame 5 (not shown in FIG. 5 ) via the main body 11 and 12 .
- the moving device for installing the positioning structure is specifically configured as rollers 13, 14, which are respectively arranged on the main bodies 11, 12, and the radiation source module 33 can be pushed through the rollers 13, 14 to move to a predetermined installation position on the XZ plane.
- the moving device for installing the positioning structure is not limited to rollers.
- the radiation source module can also be moved in a sliding manner. The source module 33 is moved to a predetermined installation position.
- the first positioning device includes first positioning pins 15, 16 and corresponding first pin holes (not shown) respectively arranged on the main body 11, 12 and the supporting frame 5 of the radiation scanning equipment, and the radiation source module 33 passes through After the rollers 13 and 14 are moved to the predetermined installation positions, the first positioning pins 15 and 16 are respectively inserted into the corresponding first pin holes, so that the radiation source module 33 can be positioned on the XZ plane.
- the lifting device includes a roller 13 arranged at the main body 11, wherein the roller 13 is specifically configured as a liftable roller, and also includes a lifting jack wire 17 arranged on the main body 12, and one end of the lifting jack wire 17 abuts against the support frame 5.
- the main body 12 and the radiation source module 33 can be lifted or lowered relative to the supporting frame 5 by twisting and lifting the jacking screw 17 .
- the position of the radiation source module 33 relative to the support frame 5 can be adjusted along the Y direction by adjusting the liftable roller 13 and the lift jack wire 17 .
- the second positioning device is formed as positioning pads 19, 20.
- the positioning pads 19, 20 are respectively placed on the Below the main bodies 11 and 12, the height of the radiation source module 33 relative to the support frame 5 can be fixed, so that the radiation source module 33 can be positioned along the first direction Y.
- the positioning block 20 below the main body 12 can be arranged in a U-shape, and the lower part of the lifting jack wire 17 is located in the opening of the U-shaped positioning block 20 to prevent the two from interfering with each other.
- the installation and positioning structure may also include first fixing bolts 21, 22 and corresponding first threaded holes provided in the main bodies 11, 12, positioning spacers 19, 20 and the support frame 5, and the first fixing bolts 21, 22 are respectively By inserting into corresponding first threaded holes and tightening, the positioning pads 19 , 20 can be fixed relative to the main bodies 11 , 12 and the support frame 5 , and the radiation source module 33 can be fixedly connected to the support frame 5 .
- the mounting and positioning structure further includes an adjustment device, which is used to rotate the radiation source module along a predetermined axis to adjust its beam output angle.
- the radiation source module 33 is provided with a mounting shaft 331, and the main bodies 11 and 12 are respectively provided with shaft holes, and the main bodies 11 and 12 are mounted on the mounting shaft 331 through the shaft holes;
- the mounting positioning structure also includes The second positioning pins 23, 24, the main bodies 11, 12 and the radiation source module 33 are respectively provided with second pin holes corresponding to the second positioning pins 23, 24, by fitting the shaft holes of the main bodies 11, 12 on the installation shaft 331 , and inserting the second positioning pins 23 , 24 into the corresponding second pin holes respectively, the main bodies 11 , 12 can be positioned relative to the radiation source module 33 .
- the installation and positioning structure also includes second fixing bolts 25 and 26 for fixing and connecting the main bodies 11 and 12 relative to the radiation source module 33 , and corresponding second threaded holes provided on the main bodies 11 and 12 and the radiation source module 33 , by screwing the second fixing bolts 25 , 26 into the corresponding second threaded holes, the main bodies 11 , 12 can be fixedly connected to the radiation source module 33 . Pulling out the second positioning pins 23, 24 and loosening the second fixing bolts 25, 26 can make the main body 11, 12 loosen relative to the radiation source module 33. In this state, the adjustment device can drive the radiation source module 33 Rotate relative to the main bodies 11 and 12 around the installation shaft 331 .
- the adjustment device includes a rotation drive mechanism
- the rotation drive mechanism includes an adjustment block 27 fixed on the radiation source module 33 and a top wire 28 arranged on the main body 11 against the adjustment block 27, the top wire 28 It can be screwed to push the adjustment block 27 to move so as to rotate the radiation source module 33 .
- the rotation driving mechanism is only arranged on one main body of the mounting and positioning structure, that is, only on one end of the radiation source module 33 along the length direction. Since both ends of the radiation source module 33 are supported by the installation shaft 331, the radiation source module 33 is pushed to rotate at one end of the radiation source module 33, and the radiation source module 33 as a whole can rotate accordingly.
- the main bodies 11 and 12 can be fixedly connected to the radiation source module 33 .
- the installation axis 331 on the radiation source module 33 can coincide with the virtual connection line of multiple target points in the radiation source module 33, therefore, rotating the radiation source module 33 around the installation axis 331 can make the radiation source module 33 Rotate around the target axis.
- the installation and positioning structure according to the above embodiment is described by taking the radiation source module 33 of the radiation source 3 in FIG. 2 as an example, the above installation and positioning structure can be applied to the installation, positioning and adjustment.
- the installation, positioning and adjustment of the radiation source module 33 of the radiation source 3 in FIG. 2 are not limited to the installation and positioning structure of the above embodiment, and any other suitable structure may also be adopted.
- the lifting device is realized by the lifting roller 13 and the lifting jack wire 17, but the lifting device is not limited to the specific structure of this embodiment, and can also be realized as other suitable structures, such as Lifting jackscrews are used on both main bodies for lifting.
- the specific implementation of the moving device, the first positioning device, the second positioning device and the adjusting device are not limited to the specific structures in the above embodiments, and other suitable structures can be adopted as long as their functions can be realized.
- a single point source group includes at least two single point sources.
- Each single point source can individually emit a beam of rays, for example a fan beam with an aperture angle A (as shown in FIG. 3 ).
- Each single point source of the radiation source 3 can emit radiation according to a predetermined time sequence under the control of the control device of the radiation scanning system.
- (d) of FIG. 4 shows a layout of radiation sources including multiple single-point source groups according to some embodiments.
- the ray source includes a plurality of single-point source groups arranged around the scanning area at bottom viewing angle, left viewing angle, right viewing angle, top viewing angle and corner oblique viewing angle, wherein: bottom viewing angle single point The source group includes 3 single point sources, which are respectively arranged at the left bottom viewing angle, the middle bottom viewing angle and the right bottom viewing angle; the top viewing angle single point source group includes 3 single point sources, which are respectively arranged at the left top viewing angle, the middle top viewing angle and the right top viewing angle Angle of view; the single-point source group of the left view angle includes 2 single-point sources, which are respectively arranged in the upper left view angle and the lower left view angle; the right view angle single-point source group includes 2 single point sources, which are respectively arranged in the upper right view angle and the lower right view Side view; corner oblique view single-point source group includes 4 single-point sources, which are respectively arranged at left upper oblique angle, right upper oblique angle, left lower oblique angle and
- each single point source group may also respectively include more single point sources.
- each single-point source may include its own installation and positioning structure to install and position the single-point source, so as to ensure that multiple single-point sources are located in the same plane perpendicular to the conveying direction of the detected object 6 .
- the installation and positioning structure can also be used to rotate the single-point source to adjust the beam-out angle of the rays of each single-point source.
- 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 each detector group are connected to each other to be arranged around the scanning area.
- Multiple detector groups can be located in the same plane perpendicular to the conveying direction of the detected object 6 or in different planes, and can optionally be arranged in the same plane. This embodiment is described as an example of being located in the same plane, but it is also applicable on different planes.
- each detector group of the detector 4 is a detector array including a plurality of detector units, and the plurality of detector groups can be arranged in a closed square structure, a rectangular structure, a polygonal structure or an elliptical structure surrounding the scanning area. , wherein part of the structure is located below the conveying device 1 to completely surround the conveying device 1 .
- Figure 2 shows an arrangement of detectors according to some embodiments, wherein the detector 4 comprises four detector groups 41, 42, 43, 44, each detector group 41, 42, 43, 44 being a linear detector array , including multiple detector units arranged along a line.
- the four detector groups 41 , 42 , 43 , 44 are arranged on the upper, lower, left, and right sides of the scanning area and their ends are connected to each other to form a closed rectangular structure (as shown in FIG. 6( a )) or a square structure.
- the arrangement of the detectors 4 is not limited to the embodiments shown in FIG. 2 and (a) of FIG. 6 , and alternatively, other structures may also be arranged.
- the detector 4 can include four longer linear detector arrays and four shorter linear detector arrays, these detector arrays are alternately arranged around the scanning area and the ends are connected to each other to form a closed polygonal structure (such as Figure 6 (b) shown).
- the detector 4 may include other numbers of multiple longer linear detector arrays and other numbers of multiple shorter linear detector arrays, these detector arrays are alternately arranged around the scanning area and the ends are connected to each other to form a closed other polygonal structures.
- the detector 4 may also include detector groups of other numbers, lengths and/or shapes to form closed structures of other shapes, such as elliptical structures and the like.
- 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 shown in FIG. 7 .
- the detector group includes a plurality of detector units 45 and a detector arm 46 , and 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 shown in FIG. 8 , and of course other suitable structures can also be adopted.
- 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 the embodiment shown in FIG.
- the detector group of the present application is not limited to the form of a linear detector array, and may also be in the form of an arc-shaped detector array to form a detector with an elliptical structure.
- the arc detector array may comprise a plurality of arc detector units and arc detector arms, and the plurality of arc detector units are arranged side by side on the arc detector arms, wherein the detector crystals of the detector units face the same direction.
- each detector group of the detector 4 is independently detachable and installable, thereby improving the maintainability of the detector.
- a plurality of 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 along the ray perpendicular to the conveying direction of the detected object 6 When the source 3 is inside, the detector group can be disassembled, adjusted and maintained without dismantling the radiation source, further improving the maintainability of the detector.
- the detector group of the detector 4 can be moved along the conveying direction of the detected object 6 relative to its installation position (for example, the support frame 5) in the radiation scanning device. Move to remove from or install to said mounting position.
- the installation and fixing structure of the detector group specifically includes a first installation part, which is fixedly arranged on the detector group; a second installation part, which is fixedly arranged on the support frame of the radiation scanning device, and Cooperate with the first installation part for linear movement, wherein the detector group can move to a predetermined installation position along the second installation part in the state where the first installation part and the second installation part cooperate with each other; and a fixing device, which is arranged on the detector group One side along the width direction is used to fix the detector group relative to the installation reference plane on the support frame.
- the detector group is installed and fixed on the support frame of the radiation scanning equipment via the detector arm, wherein the first mounting part is fixedly arranged on the detector arm of the detector group, and the fixing device is arranged on the detector arm One side along the width direction, fix the detector arm to the supporting frame to fix the detector group.
- FIG. 9 shows the installation and fixing structure of the detector group according to some specific embodiments, wherein figure (a) shows the exploded perspective view of the detector arm and the installation and fixing structure, and figure (b) is the detector group in the fixed state A partial cross-sectional view of the detector arm.
- the complete detector group is not shown in FIG. 9 , only the detector arm is shown, where multiple detector units can be arranged side by side along the length direction on the shown detector arm to form a complete detector group.
- the first installation part of the installation 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, when installed to the support frame 5 of the radiation scanning device In this state, the width direction of the detector arm 47 is consistent with the conveying direction of the detected object 6 .
- the second mounting portion is formed as a sliding rod 472 matched with the sliding groove 471 .
- the sliding groove 471 is formed as a semicircular opening sliding groove, and the sliding rod 472 is correspondingly formed as a cylindrical sliding rod.
- the sliding rod 472 is fixedly arranged on the supporting frame 5 , or is integrally formed with the supporting frame 5 , and its length direction is consistent with the conveying direction of the detected object 6 .
- One end of the sliding rod 472 close to the support frame 5 is configured to increase in size relative to the rest of the sliding rod 472 to form a convex portion 473 .
- An end surface of the protrusion 473 facing the probe arm 47 is formed as a mounting reference surface 474 for abutting against a surface 475 of the probe arm 47 on one side in the width direction.
- the surface 475 is the installation surface of the detector arm 475, which is processed to have good flatness with the installation reference surface 474.
- the fixing device is provided at the other end of the slide bar 472 opposite to the convex portion 473, and is arranged to abut against the convex portion 473 on both sides of the detector arm 471 in the width direction, thereby limiting the width of the detector arm 47 in the width direction.
- the fixing device includes a positioning sleeve 476 and a fastener 477.
- the positioning sleeve 476 is sleeved on the other end of the sliding rod 472 opposite to the convex portion 473 and abuts against the other side of the detector arm 47 along the width direction.
- the fastener 477 fixes the positioning sleeve 476 to the other end of the slide bar 472 opposite the protrusion 473 .
- the fastener 477 can be a fastening screw, and the positioning sleeve 476 and the other end of the sliding rod 472 are provided with a threaded hole, and the fastening screw is screwed in the threaded hole to tighten relative to the sliding rod 472.
- the positioning sleeve 476 is fixed so as to fix the detector arm 47 in the width direction relative to the sliding rod 472 (ie, the support frame 5 ).
- the shape fit between the slide bar 472 and the sliding slot 471 restricts other degrees of freedom, the detector arm 47 can be completely positioned and fixed.
- 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 cooperates along the conveying direction of the detected object, and the fixing device is arranged on the detector One side of the group along the width direction, and the width direction of the detector group is consistent with the conveying direction of the detected object 6 .
- the detector group can be moved along the conveying direction of the detected object 6 to be installed or disassembled, 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, and even if the detector is arranged inside the radiation source perpendicular to the conveying direction, its disassembly or maintenance can also avoid the radiation source
- the obstruction can be carried out without dismantling the radiation source, thereby improving the convenience of disassembling and maintaining the detector.
- the second installation part of the above-mentioned installation and fixing structure is configured to support the detector group at a predetermined installation position in a state of being matched with the first installation part.
- the second mounting part includes two sliding rods 472, and two sliding grooves 471 are formed on the detector arm 47 correspondingly, which are arranged at both ends of the detector arm 47 along the length direction, so that the detector arm 47 After the two slide bars 472 are moved to the predetermined installation position, the two slide bars 472 can support the detector group at the predetermined installation position without needing other auxiliary structures and/or tools. In this way, when the detector group is fastened, it can be operated without additional tools and without the operator supporting the detector group, thereby improving the convenience of operation.
- the above-mentioned installation and fixing structure is not limited to the installation and removal of the detector group arranged vertically in the radiation scanning equipment, and the detector group arranged in other directions
- the above-mentioned mounting and fixing structure can also be used.
- the installation and fixing structure between the detector group and the support frame 5 is not limited to the embodiment shown in FIG. 9 , and other suitable installation and fixing structures can also be used. It is other suitable fits, such as linear rolling fits such as the fit of linear ball bearings and cylindrical shafts.
- the cross section of the chute 471 is not limited to a semicircle, but can be a semi-rectangular shape, and correspondingly, the slide bar 472 is not limited to a cylinder, and can also be a prism matching with the slide groove 471 and the like.
- the detector when the detector includes a plurality of detector groups, setting the installation reference planes of each of the plurality of detector groups in the same plane perpendicular to the conveying direction of the detected object 6 can ensure that the plurality of detector groups After installation, it is in the same plane perpendicular to the conveying direction of the detected object 6 .
- each detector group is installed using an installation and fixing structure as shown in FIG. In the same plane where the conveying direction of the detected object 6 is vertical, and the installation surfaces 475 of each detector group along the width direction are all fixed against the respective installation reference planes 474, a plurality of detector groups must be positioned at In the same plane perpendicular to the conveying direction of the detected object 6 .
- the radiation source 3 includes a plurality of radiation source modules, each radiation source module is arranged around the 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, A plurality of detector groups are located in the same plane perpendicular to the conveying direction of the detected object 6 , and the ends of the respective detector groups are connected to each other so as to be arranged around the scanning area.
- the detector 4 is arranged inside the radiation source 3 in the vertical direction to the conveying direction of the detected object 6, and the radiation source 3 and the detector 4 are arranged in a
- the conveying direction of the object 6 to be detected is at least partially overlapped, wherein the multiple radiation source modules of the radiation source 3 can be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc.
- the detector groups are arranged in a square structure, a rectangular structure, a polygonal structure, an elliptical structure, etc., as in any embodiment described above.
- the four linear distributed radiation source modules 31, 32, 33 of the radiation source 3 , 34 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.
- the detailed arrangement in the combined state described in FIG. 2 is also applicable to the radiation source 3 and any other combination of detector 4.
- each detector group 41 , 42 , 43 , 44 of the detector 4 is arranged so as not to block the radiation beams of the radiation source modules on the same side, while being able to receive radiation from each radiation source module on the other side. Since both the radiation source 3 and the detector 4 are arranged in a ring shape, the same detector group can be shared by different radiation source modules of the radiation source.
- Fig. 10 shows the corresponding relationship between each radiation source module and the detector group receiving its radiation, wherein, the radiation beams of each target point of each radiation source module 31, 32, 33, 34 of the radiation source 3 are in the form of a fan beam (such as The ray beam with opening angle A) shown in FIG.
- a ray's detector group and its parts are indicated by thick solid lines.
- FIG. 10 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 rays from the ray source module 31
- FIG. 10 shows the corresponding detector group and part thereof of the ray beam of the ray source module 32 on the right side of the scanning area, wherein the detector group 41, 43, 44 of the detector 4 receives the ray beam from the ray source module
- FIG. 10 (c) has shown the corresponding detector group and part thereof of the ray beam of the ray source module 33 of scanning area lower side, wherein the detector group 41,42,44 of detector 4 receives from The ray beam of the ray source module 33; (d) of Fig. 10 shows the corresponding detector group and part thereof of the ray beam of the ray source module 34 on the left side of the scanning area, wherein the detector groups 41, 42, 43 receives the ray beam from the ray source module 34 . It can be seen from Fig.
- the rays of a radiation source module can be received by other side detector groups except the detector group on the same side, and different radiation source modules can share the same detector group, for example, radiation source modules 31 and 32 share The detector groups 43, 44, the radiation source modules 32, 33 share the detector groups 41, 44, and the radiation source modules 33, 34 share the detector groups 41, 42, etc.
- the rays of each ray source module can be detected by the detector group on the opposite side, and can also be received by detector groups on other sides except the detectors on the same side. Therefore, the rays of each ray source module can be received as much as possible. May be detected by detectors as many times as possible. Therefore, the detector of the present application can reduce the number of detector groups while improving image quality, and reduce equipment cost.
- 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 arranged so as to be adjacent to the same crystal in the conveying direction of the detected object 6 .
- the edge of the ray beam of the side ray source module but does not block the ray beam of the same side ray source module.
- the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the length of the device.
- Fig. 11 is a schematic cross-sectional structural view of the radiation scanning device shown in Fig. 1 along the centerline of the conveying direction of the detected object according to some embodiments.
- the detector unit can be, for example, the detector unit 45 shown in Figure 7, and the detector crystal can be, for example, the detector crystal 451 shown in Figure 7; the surface of the detector crystal 451 is parallel to the surface of the detected object 6.
- FIG. 12 shows a schematic top view of the layout of detectors and radiation sources according to some embodiments.
- the radiation source modules on the left and right sides of the figure are the radiation source modules 34 and 32 of the radiation source 3 respectively.
- the detectors on the left and right sides Detector crystals 451-4 and 451-2 represent the positions of the detector crystals of detector sets 44 and 42, respectively. It can be seen from FIG. 12 that the detector crystal 451-4 is arranged adjacent 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 radiation beam of the radiation source module 32 on the same side in the conveying direction of the detected object 6 , and does not block the radiation beam of the radiation source module 32 on the same side.
- each radiation source module of the radiation source 3 is arranged such 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.
- the ray beam of the ray source module 34 can also cover and irradiate the detector crystal 451-2 of the detector group 42 on the opposite side while avoiding the detector group 44 on the same side, and the ray beam of the ray source module 32 While avoiding the detector set 42 on the same side, the beam can also cover and illuminate the detector crystal 451-4 of the detector set 44 on the opposite side.
- each radiation source module of the radiation source 3 is arranged to irradiate the detector crystals of the detector group on the opposite side with the central position of the radiation beam.
- the ray source module can be rotated by 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 central position of the ray beam irradiates the detector crystal.
- the target axis refers to a virtual line connecting multiple target points in the radiation 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 beam of the radiation source on the same side, the radiation source module can only rotate by a very small predetermined angle, for example, is 1.5 degrees, that is, the center position of the ray beam can irradiate the detector crystal.
- 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 than the target axis to adjust the beam output angle of the ray beam, wherein the rotation of the ray source relative to the target axis or other axes can be achieved through the aforementioned
- the installation and positioning structure of the above-mentioned radiation source module is realized.
- the method of adjusting the beam emission angle of the ray beam is not limited to the above-mentioned embodiments, and other methods, such as changing the opening direction of the ray source module, adjusting the collimator, and other suitable methods to change the emission angle of the ray beam, It is sufficient as long as the above arrangement of the radiation source can be realized.
- the radiation source is composed of multiple radiation source modules, and the ends of the multiple radiation source modules are directly connected or arranged at intervals.
- the radiation source points between adjacent radiation source modules must be discontinuous, for example, the target at the ends of two adjacent radiation source modules The distance between the points is obviously larger than the distance between the target points inside the radiation source module; this is especially true in the case of the end portions of the radiation source module being arranged at intervals. Therefore, projection data is missing at the ends of adjacent radiation source modules due to lack of target points during the scanning process.
- the image processing module of the radiation scanning device of the present application is configured to have a data compensation function, which can compensate for missing view data and/or repair the reconstructed image, so as to improve image quality.
- the image processing module is configured to perform image reconstruction with an iterative method, an image threshold inpainting method or a combination of the two.
- the iterative method specifically includes the following steps:
- Step 1 Use the missing data for image reconstruction, where the missing data is the initial data measured by the detector, which lacks the projection data of the viewing angle at the non-target point, for example, when the ray scanning device uses Figure 2 or Figure 2
- the initial data measured by the detector lacks the projection data at the oblique angles of the four corners of the rectangular structure;
- Step 2 Perform forward reprojection on the reconstructed image obtained in step 1 according to the complete geometry.
- the reconstructed image obtained in step 1 may present an object with an incomplete geometric structure due to the use of missing data from the perspective, and proceed forward according to the complete geometry.
- Forward reprojection refers to performing forward reprojection when the geometric shape is completed. Specifically, the geometric shape can be completed by guessing, assuming, etc.;
- Step 3 Using the reprojection data obtained in step 2 as a reference, use the image restoration algorithm to repair the missing data in the projection domain, and use the repaired data to reconstruct the image again;
- Step 4 The aforementioned forward reprojection step, the missing data repair step and the image reconstruction step are iterated several times, and the image obtained in the last image reconstruction step is used as the final reconstructed image.
- the convergence threshold can be set in advance.
- the iteration is stopped, and the image is used as the final reconstructed image;
- the image obtained in the image reconstruction step does not meet the set convergence threshold, continue to One iteration, namely, the forward reprojection step, the viewpoint missing data repair step and the image reconstruction step, until the image obtained in the image reconstruction step satisfies the set convergence threshold.
- the image restoration algorithm in step 2 includes various traditional algorithms, such as methods based on TV regularization terms, wavelet analysis, dictionary learning, etc., and artificial neural network methods.
- image reconstruction methods include commonly used algorithms such as analytical algorithms and iterative algorithms.
- the image processing module may also use an image threshold inpainting method to obtain the reconstructed image.
- the image processing module can use the missing view data, that is, the initial data measured by the detector, to perform image reconstruction, and use an image restoration algorithm to perform artifact removal and data correction processing on the reconstructed image at the image threshold, to obtain The final reconstructed image.
- the image restoration algorithm includes various traditional algorithms, such as methods based on TV regularization terms, wavelet analysis, dictionary learning, and artificial neural network methods.
- 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, so as to improve image quality.
- the image processing module can first use the above 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 image threshold repair method to reconstruct the image obtained by the above iterative method
- the image inpainting algorithm is used to remove the artifacts and correct the data, and obtain the final reconstructed image.
- the source points of the ray source in the form of a single point source are relatively sparse, and the image processing module can use an image reconstruction algorithm suitable for sparse viewing angle data to obtain scanned images.
- the radiation source surrounds the scanning area on four sides, up, down, left, and right.
- the present application also provides a radiation scanning device, the arrangement of which is basically the same as that of the foregoing embodiments, the difference mainly lies in the arrangement of the radiation sources, wherein the radiation sources are only on the upper side, the lower side and the left and right sides Surround the scan area on one side.
- the following description takes the example that the radiation source is arranged on the upper side, the lower side and the right side of the scanning area, but it is also applicable to the case where the radiation source is arranged on the upper side, the lower side and the left side of the scanning area.
- each ray source module of the ray source 3 is a distributed multi-point source, and multiple ray source modules can be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc. surrounding the scanning area.
- the multiple ray source modules of the ray source can still be distributed multi-point sources, the difference is that the multiple ray source modules are arranged in an unclosed structure that surrounds the scanning area and opens on the left side of the scanning area, for example, the left A rectangular structure, a polygonal structure, an elliptical structure, etc. with side openings.
- the left side of the scanning area refers to the left side of the scanning area in the vertical direction to the conveying direction of the detected object 6 .
- the ray source 3 has a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon or a discontinuous rounded rectangular structure, and other polygonal and elliptical structures.
- the ray source has a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon or a rounded rectangular structure with openings on the left side of the scanning area.
- the radiation source 3 in this embodiment does not include at least the radiation source module on the left side of the detected object 6 .
- the ray source in this embodiment can also be composed of multiple single-point source groups.
- the ray source 3 in this embodiment does not include the single-point source at the left viewing angle. , or excluding single-point sources at left-hand angles and oblique left-up and left-lower angles.
- the characteristics of various aspects of the detector of this embodiment are basically the same as those of the detector 4 in the previous embodiments, the only difference is that in this embodiment, the detector and the detector are only scanned around the upper side, the lower side and the right side.
- the dismounting and installation of each detector group of the detector 4 can be adopted in addition to the same manner as the foregoing embodiment, and can also be adopted in a manner different from the foregoing embodiment as described below to further facilitate the disassembly and assembly of the detector. maintain.
- the detector 4 can be disassembled and installed in the following manner: the detector group 41', 43', 44' is perpendicular to the conveying direction of the detected object 6 (as shown in Figure 14, along the X direction ) is disassembled or installed relative to the support frame 5 , and the detector group 42 ′ is disassembled or installed relative to the support frame 5 along the conveying direction of the detected object 6 (as shown in FIG. 14 , along the Z direction).
- the detector group 42' can be disassembled or installed relative to the support frame 5 by using the same installation and fixing structure (as shown in FIG. 9 ) as in the previous embodiment.
- the installation and fixing structures of the foregoing embodiments are not suitable for the disassembly or installation of the detector groups 41', 43', 44' along the X direction, so different installation and fixing structures are required. Specific embodiments of these mounting and fixing structures will be described in detail below.
- the installation and fixing structure suitable for the disassembly and assembly of the detector groups 41 ′, 43 ′, 44 ′ in the X direction also specifically includes a first installation part, which is fixedly arranged on the detector group ; the second installation part, which is fixedly arranged on the support frame of the ray scanning equipment, and moves in a straight line with the first installation part, wherein the detector group can move along the second installation part in the state where the first installation part and the second installation part cooperate with each other The second installation part moves to a predetermined installation position; and a fixing device, which is arranged on one side of the detector group along the width direction, is used to fix the detector group relative to the installation reference plane on the support frame.
- the detector groups 41', 43', 44' are installed and fixed on the support frame of the X-ray scanning equipment via the detector arm, wherein the first mounting part is fixedly arranged on the detector arm, and the fixing device is arranged On one side of the detector arm in the width direction, it fixes the detector arm to the support frame to fix the detector group.
- FIG. 15 shows an installation and fixing structure suitable for a detector group 41' according to some specific embodiments, wherein figure (a) shows a perspective view of a detector group in an installed state, and figure (b) is a detector group in an installed state The side view below, figure (c) is a perspective view of the detector group in a disassembled state, and figure (d) is a cross-sectional view of a detector group with a fixing device in an installed state.
- the first installation part of the installation and fixing structure of the detector group 41' includes a slider 412 arranged on the detector arm 411, and the slider 412 extends along the length direction of the detector arm 411, wherein the detector When the group 41 ′ is installed in the radiation scanning device, the length direction of the detector arm 411 is perpendicular to the conveying direction of the detected object 6 .
- the slider 412 extends over a part of the length of the detector arm 411 , and in other embodiments, the slider 412 can also be configured to extend over the entire length of the detector arm 411 or other lengths.
- the slider 412 may be fixed to the detector arm 411 by bolting or the like. According to other embodiments, the slider 412 may also be integrally formed with the detector arm 411 .
- the second mounting portion is formed as a fixed guide rail 413 matched with the slider 412 .
- the fixed guide rail 413 is fixedly connected to the support frame 5 (not shown in FIG. 15 ) of the radiation scanning device, and may also 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 detected object 6 of the radiation scanning device.
- One end of the fixed guide rail 413 along the length direction can be provided with a limiting part (not shown in the figure), when the detector group 41' is installed, the slider 412 is aligned with the fixed guide rail 413, and the detector group is pushed along the fixed guide rail 413 41' until the detector arm 411 abuts against the limiting part, thereby moving the detector group 41' to a predetermined installation position.
- the fixing device is arranged on one side of the detector group 41' along the width direction, and abuts against the surface 414 of the detector arm 411 on one side along the width direction.
- the fixing device includes a positioning piece 415 and a fastener 416, wherein the positioning piece 415 is fixedly connected to the support frame 5, and its end face away from the support frame 5 is formed as an installation reference surface 417, which is used to resist Close to the surface 414 of one side along the width direction of the detector arm 411 .
- the surface 414 is the installation surface of the detector arm 411, and it and the installation reference surface 417 are all processed to have good flatness, so that when the installation surface 414 of the detector arm 411 is fixed against the installation reference surface 417, it can be fixed in the width direction.
- the fastener 416 can pass through the positioning piece 415, and fasten the detector group 41' relative to the end surface of the positioning piece 415.
- the fastener 416 may be, for example, a fastening bolt.
- Corresponding threaded holes are provided on the sides of the positioning piece 415 and the detector arm 411 opposite to the positioning piece 415, and the fastening bolt 416 is passed through the corresponding threaded hole and By tightening, the detector group 41 ′ can be fastened relative to the end face of the positioning member 415 .
- Multiple fixing devices such as at least two, can be provided along the length direction of the detector group 41', so as to firmly fix the detector group 41' on the support frame 5.
- the detector group 41' when installing the detector group 41', in the state where the detector unit of the detector group 41' faces 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 limit part on the fixed guide rail 413; then, the fastening bolt 416 is passed through the corresponding threaded hole on the positioning piece 415 and the detector arm 411 and tightened, thereby The detector group 41 ′ is positioned relative to the end surface of the positioning member 415 , that is, the installation reference surface 417 .
- the opposite operation can be carried out.
- the detector The group 41 ′ can be detached or installed relative to the support frame 5 perpendicular to the conveying direction of the detected object 6 of the radiation scanning device.
- the fixing device is arranged on one side of the detector group along the width direction, that is, the side of the detector along the Z direction. Therefore, the detector group can be fastened while avoiding the shielding of the radiation source, and the disassembly of the detector group is facilitated. installation and maintenance.
- the second installation part is configured to support the detector group 41' at a predetermined installation position in a state of being matched with the first installation part.
- the slider 412 is disposed on opposite sides of the detector arm 411 in the width direction, and has inner extensions 4121, 4122 extending inward from the edges of the detector arm 411 on the two sides opposite in the width direction (see Fig. 15 (b));
- the fixed rail 413 includes outwardly extending extensions 4131, 4132 (see Fig.
- the inner extensions 4121 , 4122 of the slider 412 are located above the outer extensions 4131 , 4132 of the fixed guide rail 413 and are in contact with and overlapped.
- the detector group 41' can be suspended on the outer extension parts 4131, 4132 of the fixed guide rail 413 through the inner extension parts 4121, 4122 of the slider 412 .
- 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 fastened, the operator does not need to fix the detector.
- the group 41' can be operated with support, thereby improving the convenience of operation.
- Fig. 16 shows an installation and fixing structure suitable for a detector group 43' according to some specific embodiments, wherein figure (a) shows a perspective view of the detector group in an installed state, and figure (b) is a detector Side view of the group installed.
- the first installation part of the installation 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 the detector
- 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 through bolt connection or the like, and can also be integrally formed with the detector arm 431 .
- the detector arm 431 is formed with a groove 433 extending in the length direction, and the slider 432 is disposed in the groove 433 .
- the second mounting portion is formed as a fixed guide rail 434 matched with the slider 432 .
- the fixed guide rail 434 is fixedly connected to the support frame 5 of the X-ray scanning device, and may 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 .
- One end of the fixed guide rail 434 along the length direction can be provided with a limiting part (not shown in the figure), when the detector group 43' is installed, the slide block 432 is aligned with the fixed guide rail 434, and the detector group is pushed along the fixed guide rail 434 43' until the detector arm 431 abuts against the limiting part, thereby moving the detector group 43' to a predetermined installation position.
- the fixing device of the installation and fixing structure of the detector group 43' adopts the same fixing device as that of the detector group 41', and the specific structure of the fixing device will not be described in detail here.
- the detector group 43' can be fastened and fixed against the corresponding installation 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 plane on the support frame 5 are all processed to have good flatness, When the installation surface of the detector arm 431 abuts against the installation reference surface, the detector group 43 ′ can be accurately positioned in the width direction.
- multiple fixing devices can be provided along the length direction of the detector group 43', such as at least two, so as to firmly fix the detector group 43' on the support frame 5.
- the detector The group 43' can be detached or installed relative to the support frame 5 perpendicular to the conveying direction of the detected object 6 of the radiation scanning device.
- the fixing device is arranged on one side of the detector group 43' along the width direction, that is, the side of the detector along the Z direction. Therefore, the detector group can be fastened while avoiding the shielding of the radiation source, which facilitates the detection of the detector group. disassembly and maintenance.
- the second installation part is configured to support the detector group 43' at a predetermined installation position in a state of being matched with the first installation part.
- the fixed guide rail 434 includes supporting parts 4341, 4342.
- the supporting parts 4341, 4342 also support the sliding block 432 under the sliding block 432, thereby After the detector group 43' moves to the predetermined installation position along the fixed guide rail 434, the detector group 43' is supported at the predetermined installation position from below. In this way, when the detector group 43' is fastened, it can be operated without additional tools and without the operator supporting the detector group 43', thereby improving the convenience of operation.
- FIG. 17 shows an installation and fixing structure suitable for a detector group 44' according to some specific embodiments, wherein figure (a) shows a perspective view of the detector group in an installed state, and figure (b) is the first installation and fixing structure of the detector group.
- FIG. 17 shows an installation and fixing structure suitable for a detector group 44' according to some specific embodiments, wherein figure (a) shows a perspective view of the detector group in an installed state, and figure (b) is the first installation and fixing structure of the detector group.
- Figures (c) and (d) are perspective views of different viewing angles when the first mounting part and the second mounting part of the mounting and fixing structure are mated.
- the first installation portion of the installation 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 a direction toward the detector arm 441 along the thickness direction.
- the width direction of the detector arm 441 is consistent with the conveying direction of the detected object 6 of the radiation 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 means of bolt fixing or the like, and can also be integrally formed with the detector arm 441 .
- the second mounting part is formed as a cantilever part 444 fixed on the support frame 5, and an extension part 445 is provided at the end of the cantilever part 444 away from the support frame 5, and the extension part 445 is linearly moved and matched with the opening 443 on the fixed block 442, That is, the extension part 445 can move straightly 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 detected object 6 of the radiation scanning device.
- the bottom of the opening 443 can be used as a stopper.
- the fixing device is arranged on one side of the detector arm 441 along the width direction (disposed on the same side as the fixing block 442), the end surface of the fixing device is formed as a mounting reference plane, and the fixing device fastens the detector arm 441 relative to the mounting reference plane .
- the fixing device may include a fixing piece 446 and a fastener 447, and the end surface of the fixing piece 446 away from the support frame 5 is formed as a mounting reference plane 448, which is used to abut against one side of the detector arm 441 along the width direction. Surface 449.
- the surface 449 is the installation surface of the detector arm 441, and it and the installation reference surface 448 are all processed to have good flatness, when the installation surface 449 of the detector arm 441 is fixed against the installation reference surface 448, it can Accurately position detector set 44'.
- the fastener 447 is used to fasten the detector arm 441 relative to the end surface 448 of the fixing piece 446 .
- the fastening member 447 can be a fixing bolt, and the side opposite to the fixing member 446 along the width direction of the detector arm 441 is formed with a corresponding threaded hole on the fixing member 446, and the fixing bolt 447 can pass through the fixing member 446 and the detector.
- the fixing device may include a plurality, 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', so as to securely fix and position the detector group 44'.
- the detector group 44' when installing the detector group 44', in the state where the detector unit is facing the scanning area and the width direction is consistent with the conveying direction of the detected object 6, firstly, the fixed block 442 on the detector group 44' The opening 443 of the cantilever part 444 is aligned with the extension 445 of the cantilever part 444, and the detector group 44' is moved along the extension 445 until the bottom of the opening 443 is against the extension 445; then, the fastener 447 is passed through the fixing part 446 and the detection Corresponding threaded holes on the arm 441 and tightened, thereby positioning the detector set 44 ′ relative to the installation reference surface 448 of the fixing member 446 .
- the opposite operation can be carried out.
- the cantilever portion 444 extends along the conveying direction of the detected object 6 in the radiation scanning device, the width direction of the detector group 44 ′ is parallel to the conveying direction of the detected object 6 , and the fixed block 442
- the opening 443 of the detector group 44' faces one side in the thickness direction, and the detector group 44' can be installed or removed along the direction perpendicular to the conveying direction of the detected object 6 by making the detector crystal face to the scanning area.
- the second installation part is configured to support the detector group 44' at a predetermined installation position in a state of being matched with the first installation part. That is, the cantilever part 444 can support the entire detector group 44' through the fixing block 442 after the detector group 44' moves to a predetermined installation position relative to the extension part 445 of the cantilever part 444, without requiring other auxiliary structures or tools. In this way, when the detector group 44' is fastened, it can be operated without additional tools and without the operator supporting the detector group 44', thereby improving the convenience of operation.
- each detector group 41', 42', 43', 44' adopts different fixed installation structures to disassemble or install relative to the support frame 5, each detector group can still be vertical to other detector groups after installation. In the same plane as the conveying direction of the detected object 6 . Specifically, setting the installation reference planes 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 position after being installed in place. In the same plane perpendicular to the conveying direction of the detected object 6 .
- the radiation source 3 includes a plurality of radiation source modules, each radiation source module is arranged around the scanning area, and is located in a plane perpendicular to the conveying direction of the detected object 6, especially in the same plane;
- the detector 4 includes A plurality of detector groups, the plurality of detector groups are located in other planes perpendicular to the conveying direction of the detected object 6, especially in the same plane, and the ends of each detector group are connected to each other to be arranged around the scanning area, and further Specifically, in the combined state of the ray source 3 and the detector 4, the detector 4 is arranged inside the ray source 3 along the vertical direction of the conveying direction of the detected object 6, and the ray source 3 and the detector 4 are arranged so that the detected object 6 6 at least partially overlap in the conveying direction, wherein the plurality of detector groups of the detector 4 can be any one of the closed square structure,
- the multiple radiation source modules of the radiation source 3 are arranged in a non-closed structure that surrounds the scanning area and opens on the left side of the scanning area, such as a rectangular structure, a polygonal structure, and an elliptical structure with an opening on the left side etc., as any structure described above in this embodiment.
- each detector group of the detector 4 in this embodiment is optionally arranged so as not to block the radiation beams of the radiation source modules on the same side, while being able to receive radiation from the radiation source modules on the other sides. Since the radiation source 3 and the detector 4 are arranged in a ring (wherein the radiation source 3 is a semi-closed ring with an opening on the left), the same detector group can be shared by different radiation source modules of the radiation source. In addition, the rays of each radiation source module of the radiation source 3 can be detected by other side detector groups in addition to being detected by the detector group on the opposite side. Therefore, the radiation of each radiation source module can be detected by as much as possible. detected by the detector. Therefore, the detector of this embodiment can also improve the image quality while reducing the number of detector groups and reducing equipment costs.
- 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 in a manner that the detected object 6 In the conveying direction, it is close to the edge of the radiation beam of the radiation source module on the same side, but does not block the radiation beam of the radiation source module on the same side.
- the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the length of the device.
- each radiation source module of the radiation source 3 is arranged such 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.
- the ray source module can be rotated at a predetermined angle relative to the target axis to adjust the beam output angle of the ray beam of the ray source module, so that the central position of the ray beam irradiates the detector crystal.
- the radiation source module can only rotate by a very small predetermined angle, for example, is 1.5 degrees, that is, the center position of the ray beam can irradiate the detector crystal. In this way, it is possible to minimize the adverse effect of the ray beam obliquely incident on the surface of the detector crystal on the imaging. Similar to the foregoing embodiments, the radiation source module can be rotated around the target axis or other axes, or through other suitable methods mentioned in the foregoing embodiments to adjust the beam-out angle of the radiation beam.
- projection data is also lacking at the end of the adjacent radiation source module of the radiation source in this embodiment, so the image processing module of the radiation scanning device in this embodiment is also configured to have a data compensation function, It can compensate for missing perspective data and/or repair reconstructed images to improve image quality.
- the image processing module of the radiation scanning device in this embodiment uses the same method as that in the previous embodiment to perform image reconstruction.
- the radiation scanning device of this embodiment also has the following advantages.
- the ray scanning device of this embodiment is particularly suitable for use in the security inspection of hand luggage at airports.
- Airport hand luggage has the characteristics of small size (for example, usually within 600mm*400mm), large length, wide width and small thickness, and when it is placed on the conveyor for detection, the thickness is usually along the up and down direction, the width along the left and right directions, and the length along the Conveying direction.
- radiation source modules are arranged on 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 with smaller dimensions.
- the projection data in the thickness direction is less affected by self-occlusion and ray attenuation.
- the projection data in the thickness direction is more accurate and clear than other directions, which is conducive to improving image quality.
- the ray source module 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.
- the projection data is greatly affected by the self-occlusion of the luggage item and the ray attenuation. Therefore, the projection data The quality is poorer than the projection data quality in the thickness direction. Setting the ray source module on only one side in the width direction of the luggage can reduce the cost of the ray source while ensuring the image quality.
- 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 side detector group opposite to the left side of the scanning area, and the right side detector group can receive radiation from the upper and lower sides
- the corresponding detection data of the rays of the ray source modules on the upper and lower sides are added. Therefore, image quality can be improved compared to the case where the detector group is only arranged on the opposite side of each ray source module.
- this embodiment is described by taking the multiple radiation source modules of the radiation source arranged in the same plane perpendicular to the conveying direction of the detected object as an example, but it is also applicable to the multiple radiation source modules of the radiation source being arranged in the same plane perpendicular to The situation in different planes of the conveying direction of the detected object.
- the embodiment has been described with the example that multiple detector groups of the detector are arranged in the same plane of the conveying direction of the object to be detected, but it is also applicable to the multiple detector groups of the detector being arranged on a plane perpendicular to the object to be detected The situation in different planes of the conveying direction.
- the present application also provides a radiation scanning device, the arrangement of which is basically the same as that of the foregoing embodiment, the difference mainly lies in the arrangement of the radiation source, wherein in this embodiment, the radiation source is only on the The scanning area is surrounded by three sides, the left side and the right side, that is, the radiation source surrounds the scanning area only above the conveying device, and no radiation source module is arranged below the conveying device (see FIG. 18 for details.
- FIG. 18 shows the The schematic diagram of the layout of the ray source and the detector in this embodiment).
- the above of the conveying device includes not only directly above the conveying device, but also above the side of the conveying device; in addition, the above of the conveying device is not strictly limited to be higher than the conveying device in height, and is approximately the same in height as the conveying device , or slightly lower than the transmission device is also included in the scope of this embodiment.
- each ray source module of the ray source 3 is a distributed multi-point source, and multiple ray source modules can be arranged in a rectangular structure, a polygonal structure, or an elliptical structure surrounding the scanning area. Wait.
- the multiple ray source modules of the ray source can still be distributed multi-point sources, the difference is that the multiple ray source modules are arranged in a non-closed structure that surrounds the scanning area and opens below the conveying device, for example, in the conveying Rectangular structures, polygonal structures, elliptical structures, etc. with openings below the device.
- the ray source 3 has a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal or discontinuous rounded rectangular structure, and other polygonal and elliptical structures.
- the radiation source is in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon or a discontinuous rounded rectangular structure with openings below the conveying device and other polygonal and elliptical structural arrangements.
- the radiation source shown in FIG. 34 below the conveying device 1; for example, compared to the radiation source shown in (b)-(c) in FIG.
- the ray source in this embodiment can also be composed of multiple single-point source groups, the only difference is that the ray source 3 in this embodiment does not include bottom angle of view, left oblique angle of view and right lower oblique angle of view. single point source.
- the characteristics of various aspects of the detector of this embodiment are basically the same as the detector 4 in the previous embodiment, the only difference is that in this embodiment, the detector is surrounded only on the upper side, the left side and the right side.
- the radiation source combination of the scanning area, the detector group below the scanning area of the detector 4 has no radiation source module on the same side, and the disassembly and installation of the detector group below the scanning area of the detector 4 will not be affected by the radiation from the lower side Blocking of source modules. Therefore, except that each detector group of the detector can be disassembled using the same installation and fixing structure as the previous embodiment, the detector group located below the scanning area is not hindered by the left or right ray source module. , can also be disassembled or installed relative to the support frame 5 along a direction perpendicular to the conveying direction of the detected object 6, specifically, the installation and fixing structure described above with reference to FIG. 16 can be used for disassembly and assembly.
- the relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device of this embodiment is basically the same as that of the foregoing embodiment.
- the radiation source 3 includes a plurality of radiation source modules, each radiation source module is arranged around the scanning area, and is located in a plane perpendicular to the conveying direction of the detected object 6, especially in the same plane;
- the detector 4 includes a plurality of detector groups, the plurality of detector groups are located in other planes perpendicular to the conveying direction of the detected object 6, especially in the same plane, and the ends of the respective detector groups are connected to each other to surround the scanning area arrangement, and further, in the combined state of the radiation source 3 and the detector 4, the detector 4 is arranged inside the radiation source 3 along the vertical direction of the conveying direction of the detected object 6, and the radiation source 3 and the detector 4 are arranged
- the detection objects 6 are at least partially overlapped in the conveying direction, wherein the plurality of detector groups of the detector 4 can be any of the enclosed square structures, rectangular structures
- the multiple radiation source modules of the radiation source 3 are arranged in a non-closed structure that is opened below the conveying device around the scanning area, such as a rectangular structure, a polygonal structure, an elliptical structure that is opened below the conveying device Shaped structure, etc., such as any structure described above in this embodiment.
- each detector group of the detector 4 in this embodiment is optionally arranged so as not to block the radiation beams of the radiation source modules on the same side, while being able to receive radiation from the radiation source modules on the other sides. Since both the radiation source 3 and the detector 4 are arranged in a ring shape (wherein the radiation source 3 is a semi-closed ring with a lower opening), thus, the same detector group can be shared by different radiation source modules of the radiation source.
- the radiation of each radiation source module of the radiation source 3 can be detected by other side detector groups besides being detected by the detector group on the opposite side, therefore, the radiation of each radiation source module can be detected as much as possible detected by the device. Therefore, the detector of this embodiment can also improve the image quality while reducing the number of detector groups and reducing equipment costs.
- 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 in a manner that the detected object 6 In the conveying direction, it is close to the edge of the radiation beam of the radiation source module on the same side, but does not block the radiation beam of the radiation source module on the same side.
- the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the length of the device.
- each radiation source module of the radiation source 3 is arranged such 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.
- the ray source module can be rotated at a predetermined angle relative to the target axis to adjust the beam output angle of the ray beam of the ray source module, so that the central position of the ray beam irradiates the detector crystal.
- the radiation source module can only rotate by a very small predetermined angle, for example, is 1.5 degrees, that is, the center position of the ray beam can irradiate the detector crystal. In this way, it is possible to minimize the adverse effect of the ray beam obliquely incident on the surface of the detector crystal on the imaging. Similar to the foregoing embodiments, the radiation source module can be rotated around the target axis or other axes, or through other suitable methods mentioned in the foregoing embodiments to adjust the beam-out angle of the radiation beam.
- projection data is also lacking at the end of the adjacent radiation source module of the radiation source in this embodiment, so the image processing module of the radiation scanning device in this embodiment is also configured to have a data compensation function, It can compensate for missing perspective data and/or repair reconstructed images to improve image quality.
- the image processing module of the radiation scanning device in this embodiment uses the same method as that in the previous embodiment to perform image reconstruction.
- the radiation scanning device of this embodiment also has the following advantages.
- the radiation scanning device of this embodiment does not arrange a radiation source module under the conveying device, so the height of the conveying device can be reduced, and the transport of the detected items to the conveying device is facilitated; in addition, compared with the aforementioned arrangement of the radiation source module under the conveying device Embodiment, this embodiment can save equipment cost.
- the ray scanning device in this embodiment is not provided with a lower ray source, it still has an upper detector group opposite to the lower position, which can receive rays from the ray source modules on the left and right sides, increasing the left and right sides.
- the corresponding detection data of the rays of the side ray source module Therefore, image quality can be improved compared to the case where the detector group is only arranged on the opposite side of each ray source module.
- this embodiment is described by taking the multiple radiation source modules of the radiation source arranged in the same plane perpendicular to the conveying direction of the detected object as an example, but it is also applicable to the multiple radiation source modules of the radiation source being arranged in the same plane perpendicular to The situation in different planes of the conveying direction of the detected object.
- the embodiment has been described with the example that multiple detector groups of the detector are arranged in the same plane of the conveying direction of the object to be detected, but it is also applicable to the multiple detector groups of the detector being arranged on a plane perpendicular to the object to be detected The situation in different planes of the conveying direction.
- the radiation scanning device is described in which the radiation source and the detector surround the scanning area on four sides: up, down, left, and right.
- the present application also provides a radiation scanning device, which is basically the same in structure as the radiation scanning device in the foregoing embodiment, except that the arrangement of radiation sources and detectors is different.
- multiple radiation source modules of the radiation source are arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area, and multiple detection modules of the detector
- the detector group is also arranged around the scanning area with a non-closed structure opening on one side of the scanning area, and the opening of the non-closed structure of the detector is set opposite to the opening of the non-closed structure of the radiation source; in addition, multiple detectors of the detector
- the detector group is fixed in the same plane perpendicular to the conveying direction of the detected object, and the multiple radiation source modules of the radiation source are fixed in multiple different planes perpendicular to the conveying direction of the detected object.
- the arrangement of the radiation source is in The radiation source module on the opening side of the non-closed structure of the detector and each detector group of the detector are fixed in the same plane perpendicular to the conveying direction of the object to be detected, while the other radiation source modules of the radiation source are fixed in the same plane perpendicular to the direction of the detected object. Detect objects in other planes of the conveying direction.
- the radiation source of the radiation scanning device in this embodiment includes multiple radiation source modules, and each radiation source module may be a distributed multi-point source.
- each ray source module can have multiple targets, and each target point of each ray source module can generate ray beams independently, and each target point can be generated according to a predetermined timing under the control of the control device beam of rays.
- the beam of rays may be a fan beam with an aperture angle A, as shown in FIG. 3 .
- the shape of the ray beam is not limited to a fan beam, and may also be a ray beam of other shapes such as a cone beam and a parallel beam, which may be specifically set as required.
- the plurality of radiation source modules of the radiation source surround the scanning area on four sides, while in this embodiment, viewed along the conveying direction of the detected object, the rays
- the plurality of radiation source modules of the source are arranged around the scanning area only on three sides, ie in a non-closed structure that is open on one side of the scanning area.
- Fig. 19-Fig. 21 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 is the layout of the radiation source and the detector shown in Fig. 19 A schematic side view of the object to be detected viewed from the conveying direction.
- Figure 21 is a schematic top view of the layout of the radiation source and detector shown in Figure 19, where the radiation source modules on the left and right sides of the scanning area are arranged perpendicular to the object to be detected in the same plane as the conveying direction (as shown by the solid line ray exit position in Figure 21), 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 by the dotted line in Figure 21 As shown in the position of the ray outlet)), viewed from the conveying direction of the object to be detected, the ray source 3 includes ray source modules 31, 32, 33 arranged on the left side, the right side and the lower side of the scanning area respectively.
- the ray source modules 31, 32 and 33 form a non-closed structure surrounding the scanning area with an opening on the upper side of the scanning area.
- the radiation source module is a linear distributed multi-point source
- the non-closed structure of the radiation source is a right-angled rectangular structure with an 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, may also be in the shape of an arc, a broken line, or the like.
- Linear, arc-shaped or broken-line ray source modules can be arranged or combined as required, so that viewed from the conveying direction of the detected object, the ray source 3 can be in the form of a rounded rectangular structure with an opening on the upper side of the scanning area surrounding the scanning area, Polygonal structures, elliptical structures, etc.
- the radiation source modules of the radiation source 3 are not limited to being arranged on the left, right and lower sides of the scanning area, and can also be arranged on, for example, the upper, left and right sides, The upper, lower, and left sides, and the upper, lower, and right sides can be set according to actual usage scenarios.
- the case where the radiation source module is arranged on the left side, the right side and the lower side of the scanning area is taken as an example for description, but the described principle is also applicable to any other three-side arrangement of the radiation source module Case.
- the multiple radiation source modules of the radiation source in this embodiment can also be disassembled and installed independently of each other, that is, each radiation source module has a separate cavity for accommodating its own radiation generating device , each radiation source module has a separate cavity, which means that multiple targets of each radiation source module share a single vacuum chamber.
- the distance between multiple target points of each radiation 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 radiation source module may be 192, 264, etc., and the distance between target points in a single radiation source module may be 4 mm, 12 mm, etc.
- Each ray source module has a separate cavity and has the following advantages: Compared with the ray source of the integrated annular cavity (that is, all the target points of the ray source are located in the same annular vacuum cavity), the size of a single ray source module can be reduced. The size of the outer shell and the volume of the internal vacuum chamber reduce the volume and weight of a single radiation source module, so it is convenient to disassemble and install the radiation source; in addition, each radiation source module uses a separate vacuum chamber, which can reduce the impact on the radiation source. Risk of sparking in the cavity when the module is being serviced.
- each radiation source module of the radiation source 3 is provided with an installation and positioning structure, so as to facilitate the installation and adjustment of the radiation source module.
- each radiation source module of the radiation source 3 can be installed and fixed at a predetermined position in the radiation scanning device.
- the radiation source module can also be rotated to adjust the beam-out angle of the radiation beam.
- Each radiation source module of the radiation source 3 may adopt different installation methods due to different positions in the radiation scanning device, and have different installation and positioning structures.
- the ray source modules located on the left and right sides of the scanning area can be installed by hoisting through equipment such as cranes, and the ray source modules located on the lower side of the scanning area are not suitable for hoisting.
- the installation and positioning structure described in the embodiments (such as the installation and positioning structure shown in FIG. 5 ) is used to install and fix or adjust the outgoing beam angle of the ray beam.
- the radiation source 3 may also be composed of multiple single-point sources, and each radiation source module may be a single-point source group, and each single-point source group includes at least two single-point sources.
- Each single point source can individually emit a beam of rays, for example a fan beam with an aperture angle A (as shown in FIG. 3 ).
- Each single point source of the radiation source 3 can emit radiation according to a predetermined time sequence under the control of the control device of the radiation scanning system.
- each ray source module is a single-point source group, viewed 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 angle and the lower right oblique angle, and even further include the upper left oblique angle and the upper right oblique angle (as shown in FIG. 22 ).
- the detector 4 may include a plurality of detector groups, and the plurality of detector groups are optionally located in the same plane perpendicular to the conveying direction of the detected object 6 .
- the detector group in this embodiment is also a detector array including a plurality of detector units.
- a plurality of detector groups of the detector 4 are arranged around the scanning area on four sides to form a closed structure surrounding the scanning area, while in the present embodiment Among them, viewed along the conveying direction of the object to be detected, the detector groups of the detector 4 are only arranged around the scanning area on three sides, that is, they are arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area. Specifically, as shown in FIGS. 19-21 , the detector 4 includes detector groups 41 , 42 , and 43 respectively arranged on the left, right, and upper sides of the scanning area.
- the detector groups 41 , 42 , and 43 The ends of the detector groups 41 , 42 , and 43 The interconnections form a non-enclosed structure surrounding the scanning area that is open on the underside of the scanning area.
- the detector group 41, 42, 43 is a linear detector array including a plurality of detector units arranged in a straight line, thus forming a non-closed detector with an opening on the lower side of the scanning area. Rectangular or square structure.
- the detector 4 of this embodiment is not limited to the above-mentioned structure, and can also be arranged in other structures.
- the detector 4 may include 3 longer linear detector arrays and 2 shorter linear detector arrays, these detector arrays are alternately arranged around the scanning area and the ends are connected to each other to form an opening on the lower side of the scanning area.
- the non-closed polygonal structure (as shown in Figure 23).
- the detector 4 may also include other numbers of multiple longer linear detector arrays and other numbers of multiple shorter linear detector arrays, these detector arrays are alternately arranged around the scanning area and the ends are connected to each other, so as to Form other non-closed polygonal structures with openings on the lower side of the scanning area.
- the detector group of the detector 4 of this embodiment can also be an arc detector array, and a plurality of arc detector arrays are arranged around the scanning area and the ends are connected to each other to form a non-closed ellipse with an opening on the lower side of the scanning area. structure.
- the detector group of the detector 4 in this embodiment can also be a combination of a linear detector array and an arc detector array to form a non-closed structure with openings on the lower side of the scanning area, for example, an opening on the lower side of the scanning area The rounded rectangular structure, etc.
- the structure of the detector unit and the structure of the detector groups in the form of a linear detector array and in the form of an arc detector array are exactly the same as those described in the foregoing embodiment.
- the detector groups of the detector 4 are not limited to being arranged on the left, right and upper sides of the scanning area as shown in FIGS.
- the case where the detector groups shown in Figures 19-21 are arranged on the left, right and upper sides of the scanning area is used as an example to describe, but this embodiment is also applicable to the detector groups arranged on the any other three-sided situation.
- each detector group of the detector 4 is detachable and installable independently, thereby improving the maintainability of the detector.
- the plurality of detector groups of the detector 4 of the present embodiment are configured to move along the conveying direction of the detected object 6 to be disassembled and installed, so that when the detector groups of the detector 4 move along the direction perpendicular to When the conveying direction of the detected object 6 is arranged inside the radiation source 3, the detector group can be disassembled, adjusted and maintained without dismantling the radiation source, further improving the maintainability of the detector.
- the detector groups 41, 42, 43 can be moved along the conveying direction parallel to the detected object 6 for disassembly and installation, so that the radiation source modules 31, 32 can be disassembled , 33 for disassembly, adjustment and maintenance.
- the detector groups 41, 42, 43 of the detector 4 can adopt the same installation and fixing structure as described in the foregoing embodiments (the embodiment shown in FIG. 9 and its variants, etc.)
- the installation position in the apparatus is moved in the conveying direction of the object 6 to be detected to be detached from or installed to the installation position.
- the detector groups 41 , 42 , 43 can be mounted to or detached from the support frame 5 of the radiation scanning device via a detector arm.
- the detector group of the detector 4 can also move along the vertical direction of the conveying direction of the detected object to disassemble and Install.
- FIG. 24 viewed along the conveying direction of the detected object, the openings of the non-closed structure of the radiation source modules 31, 32, 33 of the radiation source face to the left side of the scanning area, and the detector groups 41, 42, The opening of the non-closed structure of 43 is towards the right side of the scanning area.
- the detector groups 41, 42, 43 can be moved relative to the installation position (such as the support frame 5) along the direction perpendicular to the conveying direction of the detected object to be disassembled or installed.
- the specific moving direction is shown in (b) of FIG. ) indicated by the arrow in the figure. Since there is no radiation source module on the left side of the scanning area, the radiation source does not hinder the above-mentioned movement of the detector, and the detector group can be easily disassembled.
- the installation and fixing structure described above that is suitable for disassembling and installing the detector group along the vertical direction of the conveying direction of the object to be detected can be used, for example, the installation and fixing structure described with reference to Fig. 15-Fig. installation method.
- the detector group of the detector 4 can also be arranged so that a part moves along the conveying direction of the detected object for disassembly and installation, and another part moves along the direction perpendicular to the conveying direction of the detected object for disassembly and installation.
- the detector group 41 can also be Move along the vertical direction of the conveying direction of the detected object to remove and install.
- the specific installation and fixing structure can adopt the embodiment shown in FIG. 15 and its modifications.
- the lower detectors of detector 4 are arranged on the left, right and lower sides of the scanning area, and the lower detector groups are lower than the lowest points of the left and right ray source modules, the lower detectors
- the group can also be moved in a direction perpendicular to the conveying direction of the object to be detected for disassembly and installation.
- the specific installation and fixing structure can adopt the embodiment shown in FIG. 16 and its modifications.
- a plurality of detector groups of detectors are mounted on the same plane by virtue of their respective installation surfaces and corresponding installation reference planes (set in the same plane perpendicular to the conveying direction of the object 6 to be detected). and then in the same plane perpendicular to the conveying direction of the detected object 6 .
- the relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device will be further described.
- the relative arrangement of the radiation source 3 and the detector 4 in this embodiment is different from the previous embodiments.
- the opening of the non-closed structure of the radiation source is arranged opposite to the opening of the non-closed structure of the detector, and a plurality of detector groups of the detector are fixed perpendicular to the In the same plane of the conveying direction of the detection object, and 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 is arranged in the opening of the non-closed structure of the detector
- the ray source module on one side and each detector group of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, while the other ray source modules of the ray source are fixed in other planes perpendicular to the conveying direction of the detected object Inside.
- Other ray source modules of the ray source can be located in other single planes perpendicular to the conveying direction of the object to be detected or in other multiple different planes, optionally in other single planes.
- other ray source modules are arranged in vertical
- the description is made in another single plane (as shown in FIG. 21 ) in the conveying direction of the object to be detected as an example, but it is also applicable to the situation of other multiple different planes.
- the ray source can be the structure of any embodiment 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 object to be detected.
- the detector can be the structure of any embodiment described above, such as a square structure, a rectangular structure, a polygonal structure, an elliptical structure, etc., with openings on one side of the scanning area, as long as the openings of the radiation source and the detector structure are arranged relatively .
- the detailed arrangement of the radiation source 3 and the detector 4 in the combined state will be described by taking the embodiment shown in FIGS. 19-21 as an example, but the same principle is also applicable to any other structure of the radiation source 3 and detector 4 combination.
- the detector group 41 of the detector 4 , 42, 43 can be respectively arranged to be able to receive radiation from each radiation source module on the other side, so that multiple radiation source modules of the radiation source can share each detector group of the detector. Thereby, the number of detector groups can be reduced.
- the rays of the ray source modules 31 and 32 can be detected by the detector groups 42 and 41 on the opposite side respectively, they can also be received by other side detector groups except the detectors on the same side, the ray source module 33
- the radiation of each radiation source module can be received by all the detector groups 41, 42, 43, therefore, the radiation of each radiation source module can be detected by the detectors as much as possible.
- the radiation scanning device of this embodiment can still obtain enough detection data for image reconstruction.
- the group can reduce the weight of the equipment, which is beneficial to the construction of light-weight ray scanning equipment.
- the radiation source module 33 of the radiation source 3 is arranged to be in the same plane as each detector group 41, 42, 43 of the detector 4, which is perpendicular to the conveying direction of the detected object. This specifically means that the radiation exit of the radiation source module 33 is facing the detector crystals of each detector group (as shown in FIG. 21 ).
- the ray beam of the ray source module 33 can cover more detector crystals, which is beneficial to obtain more detection data and improve image quality.
- the detector 4 and other rays are respectively arranged between the other radiation source modules 31, 32 of the radiation source 3 and the scanning area, and along the conveying direction of the detected object, the other radiation source modules 31, 32 It at least partially overlaps with the detector groups 41 and 42 on the same side (as shown in FIG. 21 ).
- the length of the device covered by the optical path between the radiation source and the detector can be reduced, thereby reducing the total length of the device.
- the detector group 41 , 42 when the detector groups 41, 42 overlap at least partially with the radiation source modules 31, 32 in the conveying direction of the detected object, the detector group 41 , 42 are configured to respectively avoid the radiation beams of the radiation source modules 31, 32 on the same side and receive radiation from all the radiation source modules on the same side except the radiation source modules on the same side.
- 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 object to be detected, and the detector 4 is connected with other radiation sources
- the detector groups 41 and 42 on the same side of the modules 31 and 32 are arranged to be adjacent to the beam edges of the radiation source modules 31 and 32 on the same side respectively in the conveying direction of the detected object, but do not block the beams of the radiation source modules 31 and 32 on the same side. beam of rays.
- 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 equipment length covered by the optical path between the ray source and the detector can be reduced as much as possible, thereby reducing the The overall length of the small device.
- the radiation source modules 31 and 32 of the radiation source 3 are arranged so that the radiation beams avoid the detector groups 41 and 42 on the same side respectively and illuminate the detectors of the detector groups on the opposite side crystals. Furthermore, similar to the foregoing embodiments, the ray source modules 31 and 32 can rotate a predetermined angle relative to their respective target axes to adjust the beam-out angles of the respective ray beams, so that the central positions of the respective ray beams can irradiate relative side of the detector crystal.
- the radiation source module can only rotate by a very small predetermined angle, for example, 1.5 degrees, that is, the center position of the ray beam can irradiate the detector crystal. In this way, it is possible to minimize the adverse effect of the ray beam obliquely incident on the surface of the detector crystal on the imaging.
- the radiation source module can be rotated around the target axis or other axes, or through other suitable methods mentioned in the above-mentioned embodiments to adjust the beam-out angle of the radiation beam.
- projection data may also be lacking at the ends of adjacent radiation source modules of the radiation source in this embodiment.
- the distance between the target points at the adjacent ends of the radiation source modules 31, 33 and the adjacent ends of the radiation source modules 33, 32 may be greater than The spacing between target points within each ray source, therefore, projection data is missing at these ends.
- the image processing module of the ray scanning device in this embodiment is also configured to have a data compensation function, which can compensate for the missing data of the angle of view and/or repair the reconstructed image to improve the image quality. quality.
- the image processing module of the radiation scanning device in this embodiment uses the same method as that in the previous embodiment to perform image reconstruction.
- the adjacent ends of the ray source modules 31, 33 can be And/or the adjacent ends of the ray source modules 33, 32 are 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 distance between the target points is not greater than the distance between the target points in each ray source. In this case, there is no missing projection data, and correspondingly, there is no need to use the data compensation function of the image processing module for image reconstruction.
- the radiation scanning device of this embodiment also has the following advantages.
- Both the radiation source and the detector in this embodiment surround the scanning area on three sides, compared with the situation of surrounding the scanning area on four sides (either one or both of the radiation source and the detector), sufficient Image reconstruction can also reduce the cost and weight of the equipment, so as to provide lightweight X-ray scanning equipment.
- the ray source module on one side of the scanning area is directly facing 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 amount of data. Improve image quality.
- the radiation scanning device in which the radiation source surrounds the scanning area on four sides, up, down, left, and right, or on any three of them. According to other embodiments, the radiation source can also be arranged to surround the scanning area only on any two of the four sides, up, down, left, and right. .
- each radiation source module used for the radiation source has been described above, and the above installation and positioning structure is not limited to use in the radiation scanning device of the present application, and can also be used in other suitable radiation scanning devices.
- installation and fixing structures for detector groups have been described above.
- the above installation and fixing structures are not limited to use in the radiation scanning equipment of the present application, and can also be used in other suitable radiation scanning equipment.
- the installation and fixing structures of various embodiments can be used individually or combined in a single X-ray scanning device.
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Abstract
Description
Claims (21)
- 一种射线扫描设备,包括:传送装置,其运送被检测物体通过所述射线扫描设备的扫描区域;射线源,其包括多个射线源模块,每个射线源模块包括发射射线束的至少一个射线源点,所述多个射线源模块在所述传送装置上方围绕所述扫描区域布置,并且固定在垂直于所述被检测物体的输送方向的平面内;以及探测器,其用于检测在扫描期间传输通过所述被检测物体的射线并且包括多个探测器组,所述多个探测器组的端部相互连接以围绕所述扫描区域布置,并且所述多个探测器组固定在垂直于所述被检测物体的输送方向的平面内,其中,所述探测器沿所述被检测物体的输送方向的垂直方向位于所述射线源和所述扫描区域之间,所述射线源和所述探测器布置成沿所述被检测物体的输送方向至少部分重叠,并且所述多个射线源模块可相互独立地拆卸和安装。
- 根据权利要求1所述的射线扫描设备,其中,所述射线源模块为分布式多点源,所述多个射线源模块围绕所述扫描区域构成在所述传送装置下方开口的非封闭结构。
- 根据权利要求2所述的射线扫描设备,其中,所述多个射线源模块的各个为直线分布式多点源,多个直线分布式多点源布置在所述扫描区域的上侧、左侧和右侧,其中所述多个直线分布式多点源的端部直接连接或间隔布置。
- 根据权利要求2所述的射线扫描设备,其中,所述多个射线源模块包括多个第一分布式多点源和多个第二分布式多点源,所述多个第一分布式多点源与所述多个第二分布式多点源交替布置,且端部之间直接连接或间隔设置。
- 根据权利要求4所述的射线扫描设备,其中,所述第一分布式多点源是直线分布式多点源,所述第二分布式多点源是长度比所述第一分布式多点源短的直线分布式多点源或弧形分布式多点源。
- 根据权利要求1所述的射线扫描设备,其中,所述多个射线源模块的各个是单点源组,多个单点源组至少布置在所述传送装置上方的左侧视角、右侧视角、顶视角和角落斜视角上,并且每个单点源组包括至少两个单点源。
- 根据权利要求1-5中任一项所述的射线扫描设备,其中,每个射线源模块具有单独的腔体以用于容纳各自的射线发生装置。
- 根据权利要求7所述的射线扫描设备,其中,每个射线源模块的单独腔体设置有安装定位结构,所述安装定位结构用于对所述射线源模块进行安装和定位,并且用于转动所述射线源模块以调节射线束的出束角度。
- 根据权利要求1-6和8中任一项所述的射线扫描设备,其中,每个探测器组是包括多个探测器单元的探测器阵列,所述多个探测器组布置成围绕所述扫描区域的封闭的方形结构、矩形结构、多边形结构或椭圆形结构。
- 根据权利要求9所述的射线扫描设备,其中,每个探测器组是直线探测器阵列,所述探测器包括四个直线探测器阵列,所述四个直线探测器阵列布置在扫描区域的上下左右四侧,形成矩形或方形结构。
- 根据权利要求9所述的射线扫描设备,其中,每个探测器组是直线探测器阵列,所述探测器包括多个第一直线探测器阵列和多个第二直线探测器阵列,所述第二直线探测器阵列比所述第一直线探测器阵列短,所述第一直线探测器阵列和所述第二直线探测器阵列环绕所述扫描区域交替布置以形成多边形结构。
- 根据权利要求9所述的射线扫描设备,其中,所述探测器的各个探测器组是可相互独立地拆卸和安装的。
- 根据权利要求12所述的射线扫描设备,其中,所述探测器的各个探测器组构造成沿所述被检测物体的输送方向移动以拆卸和安装。
- 根据权利要求12所述的射线扫描设备,其中,所述探测器的各个探测器组构造成一部分探测器组沿所述被检测物体的输送方向移动以拆卸和安装,另一部分探测器组沿所述被检测物体的输送方向的垂直方向移动以拆卸和安装。
- 根据权利要求13或14所述的射线扫描设备,其中,所述探测器的各个探测器组包括探测器臂,所述射线扫描设备包括相对于所述射线扫描设备的安装平台固定的支撑框架,所述探测器组经由所述探测器臂沿所述被检测物体的输送方向或所述被检测物体的输送方向的垂直方向移动以安装到所述支撑框架或从所述支撑框架拆卸。
- 根据权利要求9所述的射线扫描设备,其中,所述探测器的各个探测器组被构造成避开同侧射线源模块的射线束并且接收除了同侧射线源模块之外的其余所有侧射线源模块的射线。
- 根据权利要求9所述的射线扫描设备,其中,所述探测器组的每个探测器单元包括用于接收在扫描期间传输通过所述被检测物体的射线的探测器晶体,所述探测器晶体布置在所述探测器单元的沿所述被检测物体的输送方向的端部,并且布置成在所述被检测物体的输送方向上紧邻同侧射线源模块的射线束边缘,但不遮挡所述射线束。
- 根据权利要求17所述的射线扫描设备,其中,所述射线源的各个射线源模块布置成使得射线束避开同侧探测器组并且照射相对侧的探测器组的探测器晶体。
- 根据权利要求18所述的射线扫描设备,其中,各个射线源模块构造成绕靶轴转动以使得射线束的中心位置照射相对侧的探测器组的探测器晶体。
- 根据权利要求1-6、8、10-14以及16-19中任一项所述的射线扫描设备,还包括:图像处理模块,所述图像处理模块配置成针对所述射线源模块的端部处的投影数据缺失进行数据补偿和/或重建图像修复以得到完整的重建图像。
- 根据权利要求20所述的射线扫描设备,其中,所述图像处理模块构造成通过迭代方法、图像阈修复方法或者两者的组合来进行图像重建。
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2021
- 2021-07-07 CN CN202110769674.8A patent/CN115097537A/zh active Pending
-
2022
- 2022-07-01 EP EP22836830.4A patent/EP4369055A1/en active Pending
- 2022-07-01 KR KR1020237044638A patent/KR20240021831A/ko unknown
- 2022-07-01 WO PCT/CN2022/103432 patent/WO2023280079A1/zh active Application Filing
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