CN117518282A - Miniaturized security inspection CT system - Google Patents
Miniaturized security inspection CT system Download PDFInfo
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- CN117518282A CN117518282A CN202311484794.9A CN202311484794A CN117518282A CN 117518282 A CN117518282 A CN 117518282A CN 202311484794 A CN202311484794 A CN 202311484794A CN 117518282 A CN117518282 A CN 117518282A
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- 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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Abstract
The invention discloses a miniaturized security inspection CT system, which comprises a security inspection CT machine and a transmission mechanism, wherein a through channel is formed in the side part of the security inspection CT machine, a rotating support provided with a slip ring is rotatably connected in the through channel, and an X-ray source is arranged at the side position of the rotating support. According to the invention, the plurality of detector modules are arranged at the same center of a circle with the target position of the X-ray source, the center of the circle coincides with the rotation center of the rotary support or is collinear in the vertical direction, the diameter of the rotary support is reduced by the layout mode, so that the width of the security CT system equipment and the weight of the whole machine are further reduced, the volume of the security CT system is obviously reduced under the condition that the scanning visual field is unchanged, the miniaturization is further realized, the installation and the arrangement are more convenient, and the adjusted security CT machine is matched with the rotary support driving mechanism to support higher rotation speed, thereby being beneficial to improving the scanning speed.
Description
Technical Field
The invention relates to the field of security inspection CT systems and detector devices, in particular to a miniaturized security inspection CT system.
Background
In a Computed Tomography (CT) technique based on X-ray radiation imaging, a common transmission imaging means is used to scan the interior of a baggage item to find hidden suspected dangerous objects, and also to identify dangerous objects by means of substance identification. In the security inspection field, the speed of scanning detection directly influences the passing speed, the scanning speed of a security inspection machine can be improved, the occupied area of equipment is reduced, and particularly the width of the equipment is a key factor influencing the mass application of CT technology in the security inspection field.
Generally, a CT apparatus comprises an X-ray source, a calibration device, a rotating support, a detecting component, a special computer system for performing data calculation, a power supply and control system, and the like, wherein main factors affecting CT performance and external dimensions of the apparatus include layout modes of the X-ray source, the calibration device and the detecting component.
The positions of the radiation source and the detector need to be accurately calculated and designed, so that the subsequent imaging effect is influenced, and the performance of the whole CT equipment is further influenced. The typical CT design takes the ray source bulls-eye as the origin, the source-detector distance is taken as the radius to obtain a section of circular arc, the detector elements of the detector are regularly arranged on the section of circular arc, and the intensity range of rays received by the detector at the same moment is consistent due to the same distance, so that the difficulty in algorithm is reduced. As in chinese patent 201210350516.X the invention provides a luggage CT security inspection system, which comprises: a scanning tunnel through which a baggage item enters and exits the baggage item CT security system; an X-ray source arranged at one side of the scanning channel; the detection arm support is arranged on the opposite side of the scanning channel, the plurality of detector assemblies are arranged on the detection arm support, the head top point of at least one group of detector crystal receiving surfaces on each of the plurality of detector assemblies is positioned on an arc taking the center of the scanning channel as the center of the circle, and the plurality of detector assemblies are sequentially connected and arranged; and all receiving surfaces of the detector crystals in the plurality of detecting assemblies are in the range of the radial ray beams taking the target point as the center of a circle, and the connecting line of the midpoint of the receiving surface of at least one group of detector crystals in each detecting assembly and the target point of the X-ray source is perpendicular to the receiving surface of the detector crystals.
However, in the technical scheme, the arc where the detector is positioned and the arc where the radiation source is positioned are not one circle, if the detector is processed into a common circle center, the detector is distributed in a semicircular arc shape, the curvature is very large, the conventional technology cannot make ASG for the detector in the shape, so that the conventional CT detector is smaller in general curvature and is not in common circle with the radiation source, the arrangement of the radiation source and the detector in the arrangement can lead to large equipment volume, large occupied installation space and limited scanning speed, the large-scale application of CT equipment is influenced, and the increasingly complex security inspection condition is difficult to deal with; aiming at the limitations of the traditional CT system, in order to reduce the volume of the security inspection CT equipment, partial manufacturers use a sectional combined detector to reduce the transverse width of the CT equipment, the sectional type CT equipment is simple, the response inconsistency among modules is more prominent, the subsequent data processing and reconstruction algorithm are difficult, and the whole scanning detection efficiency is also influenced; in part, a detector layout similar to a U-shaped structure is used, and in the detector layout structure of the structure, the influence caused by the focus jitter of the radiation source is considered, namely, transition is designed among detector modules, so as to solve the problem of generating artifacts.
Therefore, it is necessary to invent a miniaturized security CT system to solve the above problems.
Disclosure of Invention
The invention aims to provide a miniaturized security CT system so as to solve the defects in the background technology.
In order to achieve the above object, the present invention provides the following technical solutions: the miniaturized security inspection CT system comprises a security inspection CT machine and a transmission mechanism, wherein a through channel is formed in the side part of the security inspection CT machine, a rotating support provided with a slip ring is rotatably connected in the through channel, an X-ray source is arranged at the side position of the rotating support, a detector support is arranged at one side of the rotating support and at the position of one end opposite to the X-ray source, a plurality of uniformly distributed detector modules are arranged on the detector support, a scanning channel is arranged in the rotating support, the transmission mechanism penetrates through the scanning channel, the X-ray source is fixedly installed on the rotating support, the cross section of the detector support is in a semi-annular shape, and a plurality of detector modules are attached to the inner side surface of the detector support in a surrounding shape;
the connecting line between the detector modules which are diametrically opposite to the X-ray source and the X-ray source target is set to be L, the rotation center of the rotating bracket is positioned on the line L, the line L is taken as the diameter to construct a track circle O, the circle center point of the track circle O is positioned on the line L, and the X-ray source target and the center point receiving surface of each detector module are tangent to the circular arc of the track circle O;
two adjacent detector modules are closely attached, and a plurality of detector modules form a near circular arc surface.
As a preferred embodiment of the present invention, the detector module includes:
the upper surface of the detection plate is fixedly provided with a detector matrix, the detector matrix consists of a plurality of detector units distributed in a matrix shape, copper sheets are alternately arranged on the detector units distributed in the matrix shape, and the upper surface of the detection plate is covered with the detector units of the copper sheets and is used for filtering low-energy rays;
the mounting plate is arranged at the bottom of the detection plate in a bonding way, and the mounting plate is fixedly connected with the detection plate through screws;
the collimator mechanism comprises a front collimator and a plurality of rear collimators, wherein the front collimator is arranged on the outer side of an X-ray source target point and is perpendicular to a line from the X-ray source target point to the rotation center of the rotating support.
As a preferable scheme of the invention, the two sides of the bottom of the mounting plate are covered with the radiator for radiating and cooling the detector module.
As a preferred embodiment of the present invention, the front collimator is configured to constrain a beam of radiation emitted from the X-ray source into a conical radial shape;
the post-collimator is arranged in front of the receiving surface of the detector matrix and is used for suppressing scattered ray interference.
As a preferable scheme of the invention, the rear collimator consists of a plurality of grid units distributed in a matrix shape, and the tops of the grid units are arranged in an opening shape;
the included angle formed between the inner wall of the grid unit and the matrix receiving surface of the detector is set to be an acute angle, and a plurality of grid unit openings face the corresponding ray directions from the X-ray source respectively, and different opening orientations are set along with the change of the ray directions;
each grid unit opening is arranged towards an X-ray source target point, and the inclination angles between the grid unit openings of the rear collimator and the matrix receiving surface of the detector are increased progressively;
the corresponding post-collimator layouts on the plurality of detector modules remain identical.
As a preferable scheme of the invention, the distances from two detector modules positioned at the head end and the tail end of the detector bracket to an X-ray source target point are equal;
the maximum fan angle of the X-ray source beam is larger than the included angle between the X-ray source target spot and the connecting line of the outer edges of the receiving faces of the detector matrix on the two detector modules at the head end and the tail end of the detector support, and the maximum fan angle of the X-ray source beam is smaller than the angle between the X-ray source target spot and the head end and the tail end of the detector support, so that the response of the detector edge channel is improved, and the condition that an object cannot be scanned due to exceeding the coverage area of the detector is prevented.
As a preferable scheme of the invention, the areas of the receiving surfaces of the detector matrixes of the plurality of detector modules are equal, and the covering angles from the ray beams emitted by the X-ray sources to the detector modules are designed to be equal angles, so that the included angles of the ray beams covering each detector module are equal.
As a preferred embodiment of the invention, the line between the rotation center of the rotating support and the detector module directly opposite to the X-ray source is set as r, and the geometrical center of the side of the scanning channel is set on the line r.
As the preferable scheme of the invention, the bottom of one side of the security inspection CT machine is fixedly connected with a driving part, and the driving part is used for transmitting the rotary bracket to make the rotary bracket rotate stably.
In the technical scheme, the invention has the technical effects and advantages that:
1. the detector modules are arranged at the same center with the X-ray source target point, the center of the circle coincides with the rotation center of the rotary support or is collinear in the vertical direction, the diameter of the rotary support is reduced by the layout mode, so that the width of the security CT system equipment is further reduced, the weight of the whole machine is further reduced, the size of the security CT system is obviously reduced under the condition that the scanning visual field is unchanged, the miniaturization is further realized, the installation and the arrangement are more convenient, and the adjusted security CT machine is matched with the rotary support driving mechanism to support higher rotation speed, so that the scanning speed is improved, compared with the prior art, the layout is closer to an ideal circle, and the detection precision is also greatly improved;
2. the center point receiving surfaces of the detector modules are tangent to the circular arc of the track circle O, the rotation center of the rotating support coincides with or is collinear with the center point of the track circle O, the X-ray source target point is tangent to the track circle O, the detector modules are mutually attached to form a near-circle receiving surface, the problem of image artifact caused by the shaking of the focus of the ray source is solved, in the prior art, a manufacturer uses a sectional combined detection plate to form a U-shaped detector when processing the detector modules, the sectional combined detection plates are distributed in a transitional ladder shape and are matched with gaps, the problem that the shaking of the focus of the ray source of the structure affects images still exists, the scheme provides a concept of different layouts, the problem of shaking of the focus of the ray source is solved, and the influence on the images is smaller;
3. through installing the back collimator on every detector module, and the back collimator overall arrangement is different from the scheme that the comparison document provided, in the detector module, the grid opening orientation of back collimator installation is the same with the ray direction, promptly along with the ray direction change, and set up different opening orientations, the inclination between back collimator and the detector matrix receiver surface progressively increases from inside to outside makes the detector matrix aim at every ray, eliminates the interference of other rays, avoids scattered ray interference, further solves the artifact problem that focus shake brought.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic diagram of the overall structure of a security CT system provided by the invention;
fig. 2 is a schematic diagram of a three-dimensional structure of a security inspection CT machine (with X-ray beam demonstration) provided by the present invention;
FIG. 3 is a front view of a security CT machine (with X-ray beam demonstration) provided by the present invention;
fig. 4 is a perspective view of a first view angle of the security inspection CT machine provided by the present invention;
FIG. 5 is a second perspective view of the security CT machine provided by the invention;
FIG. 6 is a rear view of a security CT machine provided by the present invention;
FIG. 7 is a perspective view of a detector module provided by the present invention;
FIG. 8 is a front view of a detector module provided by the present invention;
FIG. 9 is a top view of a detector module provided by the present invention;
FIG. 10 is a schematic diagram showing a layout of a plurality of detector modules and an X-ray source in a security CT apparatus according to the present invention;
FIG. 11 is a diagram showing the effect of obtaining the ray angle of an X-ray source by a plurality of detector modules in a security CT machine;
fig. 12 is a schematic layout diagram of a collimator mechanism in a security inspection CT machine provided by the present invention.
Reference numerals illustrate:
a security inspection CT machine-1; a transmission mechanism-2; rotating the bracket-3; a detector module-4; an X-ray source-5; a detector support-6; scanning channel-7; a driving unit (8); a collimator mechanism-9; a tensioning mechanism-10;
a mounting plate-41; a probe plate-42; copper sheet-43; a heat sink-44; a detector matrix-45;
driving a motor-801; pulley-802; a drive belt-803;
a front collimator-91; a rear collimator-92;
l-shaped limit rails-101; rail car-102; a push rod-103; and a press roll-104.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
The invention provides a miniaturized security inspection CT system as shown in figures 1-12, which comprises a security inspection CT machine 1 and a transmission mechanism 2, wherein a through channel is formed in the side part of the security inspection CT machine 1, a rotating support 3 provided with a slip ring is rotatably connected in the through channel, an X-ray source 5 is arranged at the side position of the rotating support 3, a detector support 6 is arranged at one side of the rotating support 3 and at the position opposite to the X-ray source 5, a plurality of uniformly distributed detector modules 4 are arranged on the detector support 6, a scanning channel 7 is arranged in the rotating support 3, the transmission mechanism 2 passes through the scanning channel 7, the X-ray source 5 is fixedly arranged on the rotating support 3, the cross section of the detector support 6 is in a semi-annular shape, and a plurality of detector modules 4 are attached to the inner side surface of the detector support 6 in a surrounding shape;
wherein the detector module 4 comprises:
the upper surface of the detection plate 42 is fixedly provided with a detector matrix 45, the detector matrix 45 consists of a plurality of detector units distributed in a matrix shape, copper sheets 43 are alternately arranged on the detector units distributed in the matrix shape, and the upper surface of the detection plate is covered with the detector units of the copper sheets 43 and used for filtering low-energy rays;
as another embodiment, the arrangement of the copper sheets 43 is based on rows, and the arrangement is not limited to the arrangement position, but may be a row of high energy, a row of low energy, or other configurations.
The mounting plate 41 is arranged at the bottom of the detection plate 42 in a bonding way, and the mounting plate 41 is fixedly connected with the detection plate 42 through screws;
the collimator mechanism 9 comprises a front collimator 91 and a plurality of rear collimators 92, wherein the front collimator 91 is arranged outside a target point of the X-ray source 5, and the front collimator 91 is perpendicular to a line connecting the target point of the X-ray source 5 to the rotation center of the rotating bracket 3;
the front collimator 91 is used for restricting the ray beam emitted by the X-ray source 5 into a conical radial shape;
the rear collimator 92 is placed in front of the receiving face of the detector matrix 45 to suppress scattered radiation interference;
in the advancing direction of object scanning, a plurality of rows of detector units are arranged, so that a plurality of groups of fault data of an object can be acquired at the same time during one X-ray emission, the scanning efficiency is improved, the collimator arrangement of each row of detectors is kept consistent, the irradiation path and range of conical radial rays in the space are shown in fig. 2-3, and the timeliness and the precision of detection are improved;
the connecting line between the detector modules 4 which are diametrically opposite to the X-ray source 5 and the target point of the X-ray source 5 is set to be L, the rotation center of the rotating bracket 3 is positioned on the line L, the line L is taken as the diameter to construct a track circle O, the center point of the track circle O is positioned on the line L, and the X-ray source 5 target point and the center point receiving surface of each detector module 4 are tangent to the circular arc of the track circle O;
the two adjacent detector modules 4 are closely attached, and the plurality of detector modules 4 form a near circular arc surface, so that rays with focus jitter do not influence the adjacent detector modules 4, a sectional combined detection plate is used for forming a U-shaped detector in the prior art, the sectional combined detection plates are distributed in a transitional step shape, and an obtained detection picture can still be influenced.
Further, in the above technical scheme, the two sides of the bottom of the mounting plate 41 are covered with the radiator 44, so as to radiate heat and cool the detector module 4, ensure stability and sensitivity of the device after long-time working, and reduce errors caused by clamping of the detector after long-time working.
Further, in the above technical solution, unlike the vertical arrangement of the comparison document, the rear collimator 92 is composed of a plurality of grid units distributed in a matrix shape, and the top of the grid units is arranged in an opening shape;
the included angle formed between the inner wall of the grid unit and the receiving surface of the detector matrix 45 is set to be an acute angle, and the openings of the grid units face the corresponding ray directions from the X-ray source 5 respectively, and different opening orientations are set along with the change of the ray directions;
each grid cell opening is disposed toward a target of the X-ray source 5, and the inclination angles between the plurality of grid cell openings of the rear collimator 92 and the receiving face of the detector matrix 45 are progressively increased;
the corresponding back collimator 92 layout on a plurality of said detector modules 4 remains consistent.
Further, in the above technical solution, the distances from the two detector modules 4 located at the front and rear ends of the detector support 6 to the target point of the X-ray source 5 are equal;
the maximum fan angle of the X-ray source 5 beam is larger than the included angle of the connecting line of the outer edges of the receiving surfaces of the detector matrix 45 on the two detector modules 4 at the head end and the tail end of the detector support 6 and is larger than the maximum fan angle of the X-ray source 5 beam, the response of the detector edge channel is prevented from being too bad, and the maximum fan angle of the X-ray source 5 beam is smaller than the angle between the head end and the tail end of the X-ray source 5 target and the detector support 6 and is used for improving the response of the detector edge channel and preventing the condition that an object cannot be scanned due to exceeding the coverage of the detector, so that the purposes of reducing errors and false alarms and improving the detection precision are realized.
Further, in the above technical solution, the receiving areas of the detector matrices 45 of the plurality of detector modules 4 are equal, and the coverage angles of the beams emitted by the X-ray sources 5 to the detector modules 4 are set to be equal, so that the included angles of the beams covering each detector module 4 are equal.
Further, in the above technical solution, the connection line between the rotation center of the rotating bracket 3 and the detector module 4 opposite to the X-ray source 5 is set as r, and the geometric center of the side surface of the scanning channel 7 is set on the line r, and the center of the scanning channel 7 may coincide with the rotation center of the rotating bracket 3, or may be set in a collinear manner, so that the layout relationship between the detector module 4 and the detector module 4 is not changed, and only the channel design is changed and still considered to be within the protection scope of the present patent.
Furthermore, in the above technical scheme, the bottom of one side of the security inspection CT machine 1 is fixedly connected with the driving part 8, and the driving part 8 is used for driving the rotating bracket 3 to rotate stably;
as an embodiment of the driving part 8 of the invention, the driving part 8 comprises a driving motor 801, a belt pulley 802 is connected with an output shaft of the driving motor 801 in a transmission way, a transmission belt 803 is sleeved between the belt pulley 802 and the outer side of the end part of the rotating bracket 3, and the belt pulley 802 is connected with the rotating bracket 3 in a transmission way through the transmission belt 803;
the safety inspection CT machine 1 is also provided with a tensioning mechanism 10, the tensioning mechanism 10 comprises an L-shaped limit rail 101, the L-shaped limit rail 101 is fixedly connected with the safety inspection CT machine 1, the L-shaped limit rail 101 is connected with a rail car 102 in a sliding manner, a push rod 103 is fixedly connected to the rail car 102 through a screw, one end of the push rod 103 away from the rail car 102 is rotationally connected with a press roller 104, the end of the L-shaped limit rail 101 is in threaded connection with an adjusting screw rod, the end of the adjusting screw rod is rotationally connected with the rail car 102, the rail car 102 is pushed to move through rotating the adjusting screw rod, and therefore the push rod 103 drives the press roller 104 to press a transmission belt 803, and the rotary support 3 is conveniently transmitted through a driving motor 801 and a belt pulley 802;
as another embodiment of the driving part 8 of the present invention, the driving part 8 includes a direct-drive motor, and an output end of the direct-drive motor directly engages the rotating bracket 3 through a flat gear.
As in the prior art, the connection end of the detector module 4 is provided with a data acquisition/control module, and all the CT data acquisition systems can employ a set of data acquisition modules and control modules, and further, all the acquired data can be processed by a set of algorithms, thereby improving the speed of the CT apparatus for executing scanning operation and improving the speed of data transmission and processing.
When the miniaturized security inspection CT system provided by the invention is used, luggage or other objects to be detected are placed on the transmission mechanism 2, and through the scanning channel 7 of the security inspection CT machine 1, the scanning channel is driven to move by rotating the adjusting screw rod, so that the push rod 103 drives the press roller 104 to press the transmission belt 803, the transmission of the rotary support 3 through the driving motor 801 and the belt pulley 802 is facilitated, the plurality of detector modules 4 to the X-ray source 5 is carried out to circulate around the rotation center of the rotary support 3, the X-ray source 5 emits X-ray beams, the front collimator 91 is used for restraining the beams emitted by the X-ray source 5 into a conical radial shape, the rear collimator 92 is used for restraining scattering ray interference before being placed on the receiving surface of the detector matrix 45, the detector matrix 45 of the detector module 4 collects X-ray data, and the data is reconstructed into a 3D image through the data processing center, so that CT tomographic images are obtained, and the types of the objects to be detected are further analyzed.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (9)
1. The utility model provides a miniaturized security inspection CT system, includes security inspection CT machine (1) and transport mechanism (2), the through-channel has been seted up to security inspection CT machine (1) lateral part, the inside runing of through-channel is connected with rotary support (3) of installing the sliding ring, and rotary support (3) avris position department is provided with X-ray source (5), rotary support (3) one side and the relative one end position department of X-ray source (5) are provided with detector support (6), be equipped with a plurality of evenly distributed's detector module (4) on detector support (6), rotary support (3) inside is provided with scanning channel (7), transport mechanism (2) pass in scanning channel (7), rotary support (3) fixed mounting X-ray source (5), its characterized in that, detector support (6) cross-section are semi-annular setting, and a plurality of detector modules (4) are the laminating in detector support (6) medial surface of encircling;
the connecting line between the detector module (4) and the target point of the X-ray source (5) which are diametrically opposite to each other of the X-ray source (5) is set to be L, the rotation center of the rotating bracket (3) is positioned on the line L, a track circle O is constructed by taking the line L as the diameter, the center point of the track circle O is positioned on the line L, and the target point of the X-ray source (5) and the center point receiving surface of each detector module (4) are tangent to the circular arc of the track circle O;
two adjacent detector modules (4) are closely attached, and a plurality of detector modules (4) form a near circular arc surface.
2. A miniaturized security CT system as in claim 1, wherein the detector module (4) comprises:
the upper surface of the detection plate (42) is fixedly provided with a detector matrix (45), the detector matrix (45) consists of a plurality of detector units distributed in a matrix shape, copper sheets (43) are alternately arranged on the detector units distributed in the matrix shape, and the upper surface of the detection plate is covered with the detector units of the copper sheets (43) and is used for filtering low-energy rays;
the mounting plate (41) is arranged at the bottom of the detection plate (42) in a bonding manner, and the mounting plate (41) is fixedly connected with the detection plate (42) through screws;
the collimator mechanism (9) comprises a front collimator (91) and a plurality of rear collimators (92), wherein the front collimator (91) is arranged outside a target point of the X-ray source (5), and the front collimator (91) is perpendicular to a line from the target point of the X-ray source (5) to the rotation center of the rotating bracket (3).
3. A miniaturized security CT system according to claim 2, characterized in that the two sides of the bottom of the mounting plate (41) are covered with heat sinks (44) for heat dissipation and cooling of the detector module (4).
4. A miniaturized security CT system according to claim 2, characterized in that the front collimator (91) is adapted to constrain the beam of radiation emitted by the X-ray source (5) to a conical radial;
the post-collimator (92) is placed in front of the receiving face of the detector matrix (45) for suppressing scattered radiation interference.
5. The miniaturized security CT system as set forth in claim 4, wherein the back collimator (92) is composed of a plurality of grid units distributed in a matrix shape, and the top of the grid units is provided in an opening shape;
the included angle formed between the inner wall of the grid unit and the receiving surface of the detector matrix (45) is set to be an acute angle, a plurality of grid unit openings face to the corresponding ray directions from the X-ray source (5) respectively, and different opening orientations are set along with the change of the ray directions;
each grid unit opening is arranged towards a target point of the X-ray source (5), and the inclination angles between the grid unit openings of the rear collimator (92) and the receiving surface of the detector matrix (45) are increased progressively;
the corresponding back collimator (92) layout on a plurality of said detector modules (4) remains consistent.
6. A miniaturized security CT system according to claim 2, characterized in that the distances from the two detector modules (4) located at the front and rear ends of the detector support (6) to the target of the X-ray source (5) are equal;
the maximum fan angle of the X-ray source (5) beam is larger than the included angle of the connecting line of the outer edges of the receiving surfaces of the detector matrix (45) on the two detector modules (4) at the head end and the tail end of the detector support (6), and the maximum fan angle of the X-ray source (5) beam is smaller than the angle between the head end and the tail end of the detector support (6) and the target point of the X-ray source (5) beam, so that the response of the detector edge channel is improved.
7. A miniaturized security CT system according to claim 4, characterized in that the receiving surface areas of the detector arrays (45) of the plurality of detector modules (4) are equal, and the coverage angles of the ray beams emitted by the X-ray sources (5) to the detector modules (4) are set to be equal-angle designs, and the included angles of the ray beams covering each detector module (4) are equal.
8. A miniaturized security CT system according to claim 1, characterized in that the line between the rotation center of the rotating gantry (3) and the detector module (4) diametrically opposite to the X-ray source (5) is set as r, and the geometrical center of the side of the scanning channel (7) is set on line r.
9. The miniaturized security inspection CT system according to claim 1, wherein a driving part (8) is fixedly connected to the bottom of one side of the security inspection CT machine (1), and the driving part (8) is used for driving the rotating bracket (3) to rotate stably.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998015817A1 (en) * | 1996-10-07 | 1998-04-16 | Analogic Corporation | Ct scanner with simulated parallel beam design |
| US6687326B1 (en) * | 2001-04-11 | 2004-02-03 | Analogic Corporation | Method of and system for correcting scatter in a computed tomography scanner |
| US20110176663A1 (en) * | 2010-01-21 | 2011-07-21 | Analogic Corporation | Focal spot position determiner |
| CN103674979A (en) * | 2012-09-19 | 2014-03-26 | 同方威视技术股份有限公司 | CT (computed tomography) luggage safety inspection system and detector device of CT safety inspection system |
| US20140146948A1 (en) * | 2012-11-27 | 2014-05-29 | Ge Medical Systems Global Technology Company, Llc | Ct collimator and ct system including the ct collimator |
| CN104065889A (en) * | 2014-06-25 | 2014-09-24 | 山东大学 | Pseudo dual energy X-ray line array imaging system |
| CN104316547A (en) * | 2014-11-05 | 2015-01-28 | 同方威视技术股份有限公司 | Rotary arc detector box for X-ray testing device |
| CN107315019A (en) * | 2017-07-25 | 2017-11-03 | 清华大学 | Transmission of radiation and fluorescence CT imaging systems and imaging method |
| CN108387593A (en) * | 2017-12-12 | 2018-08-10 | 北京航星机器制造有限公司 | A kind of CT detection devices |
| CN110133739A (en) * | 2019-04-04 | 2019-08-16 | 南京全设智能科技有限公司 | A kind of X-ray rays safety detection apparatus and its drawing method is known automatically |
| CN112748133A (en) * | 2020-12-24 | 2021-05-04 | 北京航星机器制造有限公司 | High-energy sparse CT detector, CT detection system and detection method |
| DE102020208094A1 (en) * | 2020-06-30 | 2021-12-30 | Siemens Healthcare Gmbh | Method for producing a lattice-shaped collimator element and lattice-shaped collimator element for a scattered ray collimator |
| CN113960086A (en) * | 2021-09-18 | 2022-01-21 | 中国航天科工集团第二研究院 | Grid collimation imaging system and method for compensation type back scattering detector |
-
2023
- 2023-11-09 CN CN202311484794.9A patent/CN117518282A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998015817A1 (en) * | 1996-10-07 | 1998-04-16 | Analogic Corporation | Ct scanner with simulated parallel beam design |
| US6687326B1 (en) * | 2001-04-11 | 2004-02-03 | Analogic Corporation | Method of and system for correcting scatter in a computed tomography scanner |
| US20110176663A1 (en) * | 2010-01-21 | 2011-07-21 | Analogic Corporation | Focal spot position determiner |
| US20140314200A1 (en) * | 2012-09-19 | 2014-10-23 | Nuctech Company Limited | Ct security inspection system for baggage and detector arrangement thereof |
| CN103674979A (en) * | 2012-09-19 | 2014-03-26 | 同方威视技术股份有限公司 | CT (computed tomography) luggage safety inspection system and detector device of CT safety inspection system |
| US20140146948A1 (en) * | 2012-11-27 | 2014-05-29 | Ge Medical Systems Global Technology Company, Llc | Ct collimator and ct system including the ct collimator |
| CN104065889A (en) * | 2014-06-25 | 2014-09-24 | 山东大学 | Pseudo dual energy X-ray line array imaging system |
| CN104316547A (en) * | 2014-11-05 | 2015-01-28 | 同方威视技术股份有限公司 | Rotary arc detector box for X-ray testing device |
| CN107315019A (en) * | 2017-07-25 | 2017-11-03 | 清华大学 | Transmission of radiation and fluorescence CT imaging systems and imaging method |
| CN108387593A (en) * | 2017-12-12 | 2018-08-10 | 北京航星机器制造有限公司 | A kind of CT detection devices |
| CN110133739A (en) * | 2019-04-04 | 2019-08-16 | 南京全设智能科技有限公司 | A kind of X-ray rays safety detection apparatus and its drawing method is known automatically |
| DE102020208094A1 (en) * | 2020-06-30 | 2021-12-30 | Siemens Healthcare Gmbh | Method for producing a lattice-shaped collimator element and lattice-shaped collimator element for a scattered ray collimator |
| CN112748133A (en) * | 2020-12-24 | 2021-05-04 | 北京航星机器制造有限公司 | High-energy sparse CT detector, CT detection system and detection method |
| CN113960086A (en) * | 2021-09-18 | 2022-01-21 | 中国航天科工集团第二研究院 | Grid collimation imaging system and method for compensation type back scattering detector |
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