CN203012155U - Rackless CT device - Google Patents
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- CN203012155U CN203012155U CN 201220736705 CN201220736705U CN203012155U CN 203012155 U CN203012155 U CN 203012155U CN 201220736705 CN201220736705 CN 201220736705 CN 201220736705 U CN201220736705 U CN 201220736705U CN 203012155 U CN203012155 U CN 203012155U
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Abstract
The utility model discloses a rackless CT device comprising a scanning channel; X-ray sources, which are disposed along the scanning channel, and comprise a plurality of radiation emission points; a plurality of fixing detector modules, which are disposed along the scanning channel, and are corresponding to the X-ray sources. In one embodiment, viewed from the plane interested with the scanning channel, at least a part of the plurality of detector modules are arranged in an L shape, a semicircular shape, a U shape, an arc shape, a parabola shape, and a curvilinear shape. By using the rackless CT device, the small size of the fixing rack type CT system and the high data identification precision can be guaranteed.
Description
Technical field
The utility model relates to a kind of no frame CT device, especially for the no frame CT device of safety check.
Background technology
In the excellent performance aspect material density identification, make the application of CT technology in safe examination system constantly expand due to the CT technology.But the data that collect different angles due to the CT Technology Need are carried out data reconstruction, traditional solution is that the radioscopy data that the slip ring system with certain speed rotation gathers different angles are rebuild, the appearance of rotary part causes the complex structure of equipment, running noise is large, equipment volume is large, and operation and the cost of safeguarding are higher.In recent years, along with the development of x-ray source technology, particularly based on the appearance of the multiple spot x-ray source of carbon nanometer technology, carry out from different perspectives data reconstruction for the CT technology new thinking is provided.
By the regular hour sequence, the triggering sequential of the ray emission points of carbon nanometer x-ray source is controlled, if the ray emission points of x-ray source is abundant, the layout of detector receiving plane is effective, the sequential control that transmits and receives is reasonable, just can be met the needed enough data volumes of CT data reconstruction, thereby realization does not rely on the reconstruction that the slip ring system of rotation is realized the CT technology.The release of no frame CT technology, the data transmission problems of the complexity that the CT technology in the past of having solved faces, and operating cost is lower, and reliability is higher.But because no frame CT technology has been cancelled rotary part, also radiographic source and the detector layout of CT equipment are had higher requirement, how rational deployment has also become one of difficult problem that each no frame CT producer faces.
Because early stage no frame CT technology is applied to the medical examination field mostly, check to be scanned object more single, and can guarantee the fixed position in scan channel, thereby modal layout type is that the detector layout is linear pattern or circular arc, and the CT data reconstruction on the different angles direction is obtained in the ray emission points by the multiple spot x-ray source and the relative motion of detector receiving plane.Contrast early stage no frame CT system, no matter be the linear pattern layout, or circular arc layout, all do not consider scan channel to the impact of x-ray source and detector layout, namely how to guarantee enough large scan channel under the small size condition, when therefore being applied to the safety check field, the overall dimension of no frame CT equipment is larger, examination speed is slow, far can not satisfy the quick inspection in safety check field to the demand of the floor area of no frame CT equipment.In the safety check field, the size of scan channel, sweep velocity are two key factors that impact checks effect, therefore the scan channel of safety check CT equipment can be obviously greater than medical CT equipment, and speed is apparently higher than the Medical CT system, add that rays safety detection apparatus is in the public domain mostly, therefore the radiation protection of equipment self is had relatively high expectations, the requirement that these bring many harshnesses for the design of rays safety detection apparatus.
The utility model content
The purpose of this utility model is to provide a kind of no frame CT device, and this no frame CT device for example has less volume, can reduce floor area thus.
According to one side of the present utility model, the utility model provides a kind of no frame CT device, and this no frame CT device comprises: scan channel; Around the fixed x-ray source that scan channel is arranged, this x-ray source comprises a plurality of ray emission points; And fixed a plurality of detector modules of arranging around scan channel, described a plurality of detector modules and x-ray source are oppositely arranged.
According to one side of the present utility model, at least some detector modules when watching in the plane of intersecting with scan channel in described a plurality of detector modules are arranged to roughly L shaped.Or described plane substantially vertical with scan channel, described plane tilts with respect to scan channel.
According to one side of the present utility model, at least some in a plurality of ray emission points of described x-ray source are arranged to roughly linear or fold-line-shaped when watching in the plane of intersecting with scan channel.Or described plane substantially vertical with scan channel, described plane tilts with respect to scan channel.
According to one side of the present utility model, be arranged to first and last extreme ray launching site in the ray emission points of linear roughly or fold-line-shaped and scan channel center line angle and be arranged to first and last end detector module in roughly L shaped detector module and the angle sum of the line at scan channel center greater than 180 degree.Thereby guarantee that data acquisition system (DAS) can access enough scan-datas.
According to one side of the present utility model, the direction that the beam that a plurality of ray emission points of described x-ray source are launched advances along scan channel perpendicular to inspected object or perpendicular to scan channel, or tilt with respect to direction or the scan channel that object advances.
According to one side of the present utility model, the beam that a plurality of ray emission points of described x-ray source are launched and the ray receiving plane of detector module are in a plane.
According to one side of the present utility model, the ray receiving plane of detector module head and the tail are adjacent, make from the ray of a plurality of ray emission points emissions to pass through between the ray receiving plane.
According to one side of the present utility model, when watching in the plane of intersecting with scan channel, the mid point line of the ray receiving plane of detector receiver module can form two straight lines, and two lines cross at a point.Or described plane substantially vertical with scan channel, described plane tilts with respect to scan channel.
According to one side of the present utility model, a plurality of ray emission points of described x-ray source and the receiving plane of described a plurality of detector modules arrange in same plane, and the direction of beam is substantially vertical with the receiving plane of corresponding detector module.Or described plane substantially vertical with scan channel, described plane tilts with respect to scan channel.
According to one side of the present utility model, each detector module can receive from least one ray launched in a plurality of ray emission points of x-ray source.
According to one side of the present utility model, ray emission points and detector module in a plurality of ray emission points of described x-ray source and described a plurality of detector module, correspondence are arranged in same plane.Or described plane substantially vertical with scan channel, described plane tilts with respect to scan channel.
According to one side of the present utility model, be arranged at least one row at the above a plurality of ray emission points of direction of scan channel.
According to one side of the present utility model, described no frame CT device also comprises: regulate the front standard apparatus of beam energy, front standard apparatus is arranged between described a plurality of ray emission points and described detector module.
According to one side of the present utility model, described front standard apparatus is to proofread and correct grid.
According to one side of the present utility model, the distance of the receiving plane of described front standard apparatus distance detector module is greater than proofreading and correct the distance of grid apart from ray emission points.
According to one side of the present utility model, the distance of the receiving plane of described front standard apparatus distance detector module is to proofread and correct grid apart from least 5 times of the distance of ray emission points.
According to one side of the present utility model, described correction grid shape is the matched curve shape.
According to one side of the present utility model, described x-ray source is the carbon nano-tube x-ray source.
The utility model can adopt carbon nanometer x-ray source, by the rational deployment to x-ray source and detector module, overcome traditional no frame CT apparatus structure complicated, bulky shortcoming, realized the miniaturization of CT rays safety detection apparatus, reduce floor area, improved no frame CT system in the availability at safety check scene.
No frame CT system based on carbon nanometer x-ray source of the present utility model, by to the control emission in carbon nanometer source and optimizing distribution of detector jib, can guarantee to obtain enough needed data of no frame CT under than skinny device width dimensions condition, thereby reach the occupation of land that reduces no frame CT equipment, reduce the purpose of equipment cost.
Description of drawings
Fig. 1 is the schematic diagram according to the no frame CT device of embodiment of the present utility model;
Fig. 2 is the layout schematic diagram of radiographic source, detector and front standard apparatus according to embodiment of the present utility model; And
Fig. 3 is the layout schematic diagram according to the radiographic source of embodiment of the present utility model and detector.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the utility model is described further.
As shown in Figures 1 to 3, according to embodiment of the present utility model, no frame CT device comprises scan channel 4; Fixed x-ray source 7, this x-ray source comprise a plurality of ray emission points 71; And fixed a plurality of detector module 10, detector module 10 is arranged on detector jib 5, detector jib 5 is oppositely arranged with x-ray source 7, and when watching in the plane of intersecting with scan channel 4 (this plane can be with scan channel substantially vertical or this plane can tilt with respect to scan channel), detector module 10 is arranged to roughly L shaped, obvious transverse arm 13 and perpendicular arm 11 are namely arranged, and transverse arm 13 interconnects with perpendicular arm 11, without disconnecting.The plane that the ray emission points 71 of x-ray source 7 and detector jib 5 or detector module 10 forms is substantially vertical with the direct of travel of scan channel 4 or conveying device 1 or with respect to the direct of travel inclination of scan channel 4 or conveying device 1.A plurality of ray emission points 71 and detector jib 5 or detector module 10 are arranged around scan channel 4.As shown in the figure, in a kind of preferred embodiment, this no frame CT device also comprises for the light barrier system 3 that surveys inspected object turnover scan channel, gathers control module 6, computer reconstruction unit 8, for delivery of the conveying device 1 of inspected object 2.
As shown in Figure 2, all fan-shaped x-ray beams that x-ray source 7 is launched can be full of the effective scanning zone 15 in scan channel 4, unobstructed dead angle.The X ray of each ray emission points 71 of x-ray source 7 goes out bundle and is gathered control module 6 controls, and the launch time of X ray launching site 71, interval and intensity are adjustable.Ray emission points 71 can interval or stepless control triggering.The head end ray emission points 9 of x-ray source 7 and end ray emission points 17 are β with the angle of the line of (xsect) center C of scan channel 4, first and end detector module 10 in a plurality of detector modules 10 is α with the angle of the line of (xsect) center C of passage, and satisfies β and α sum greater than 180 degree.
As shown in Figure 2, detector jib 5 comprises transverse arm 13 and perpendicular arm 11, and the perpendicular arm of detector transverse arm and detector intersects, without disconnecting.Wherein on detector transverse arm 13, the mid point of the ray receiving plane of detector receiver module 10 is positioned on straight line, and on the perpendicular arm 11 of detector, the mid point of the ray receiving plane of detector receiver module 10 is positioned on another straight line, and intersects at a point between these two.The ray of a plurality of ray emission points 71 emissions can not pass through between detector jib 5.In the plane of the ray that X ray launching site 71 sends, detector module 10 tandem arrays, without disconnecting, namely the ray of all X ray point emissions must be through the receiving plane of detector.Detector module 10 in diagram can be made of line detector, also can be made of the planar array type detector.
As shown in Figure 2, when watching in the plane of intersecting with scan channel 4, ray emission points 71 is linear array, can be arranged as linear pattern (as Fig. 2) or broken line type (as Fig. 3), first and last extreme ray launching site 9 in ray emission points and 17 and the angle α sum of the angle β of the C of channel center (center of channel cross-section) line and the first and last end detector module in detector module and the C of channel center line greater than 180 degree, to guarantee that obtaining enough tomoscan data rebuilds.In Fig. 3, the direction of x-ray source divergent-ray is substantially vertical with the throughput direction of scan channel 4 or conveying device 1 or tilt with respect to the throughput direction of scan channel 4 or conveying device 1, and directions of rays is consistent with detector receiving plane direction.
On detector jib 5, detector module 10 can receive the ray from least a portion in a plurality of ray emission points 71 of x-ray source 7, in these rays, have perpendicular to receiving plane, what have tilts with respect to receiving plane.
As shown in Figure 2, when watching in the plane of intersecting with scan channel 4, ray emission points 71 is arranged in a row, detector module 10 is arranged in a row, and ray goes out Shu Fangxiang can be substantially vertical with the throughput direction of scan channel 4 or conveying device 1 or tilt with respect to the throughput direction of scan channel 4 or conveying device 1.On the baggage conveyor system direct of travel, the detector receiving plane can be arranged in single row or multiple rows.As be arranged as many rows, corresponding front calibrating installation need to correspond to many row's structures.
As shown in Figure 2, also comprise according to no frame CT device of the present utility model: to the front standard apparatus 16 that the dosage of beam is controlled, this front standard apparatus 16 is arranged between a plurality of ray emission points 71 and a plurality of detector module 10.The correction grid that front standard apparatus 16 can be the matched curve shape or other suitable correction grid.At least 5 times of the distances of front standard apparatus 16 distance detector module 10 receiving planes are to the distance of ray emission points 71 with front standard apparatus 16.
In fixed frame no frame CT device as shown in Figure 3, detector jib 5 is L shaped structure, or detector module 10 is arranged to roughly L shaped, the ray emission points 71 of x-ray source 7 can be also that broken line type is arranged, and the first and last extreme ray launching site 9 in ray emission points 71 and 17 is spent greater than 180 with the angle α sum of the line of the C of channel center with angle β and the first and last end detector module in detector module 10 10 of the line of the C of channel center.As selection, detector module 12 also can be arranged to other shape, for example semicircle, U-shaped, circular arc, parabola shaped, shaped form etc.That the ray emission points 71 of x-ray source 7 also can be arranged to is L shaped, U-shaped, semicircle, circular arc, parabola shaped, shaped form etc.
In the certain hour section, arrive the X ray energy on the detector module 10 on detector jib 5, can come from the single ray emission points 71 of x-ray source 7, also can come from the combination of several ray emission points 71 of x-ray source 7.But the X ray intensity programmed control of different ray emission points 71 emissions of x-ray source 7.The size of the ray emission points quantity of x-ray source 7, detector transverse arm and perpendicular arm is relevant to regional 15 sizes of the effective scanning in scan channel 4.The X-ray beam that all ray emission points 71 are launched covers scan channel 4.
The triggering mode of X ray launching site 71 is relevant to the collection control mode of fixed frame no frame CT device, and whether single ray emission points 71 triggers by the collection control module 6 of no frame CT device is controlled.Under the order that gathers control module 6, but the ray emission points 71 sequential firing X ray of x-ray source 7, and ray emission points transmission interval, frequency are gathered the order of control module 6 and are arranged.
In no frame of the present utility model system, gather control module 6 and control by the Can bus, comprise control to x-ray source 7, to the control of detector module 10.When being examined luggage 2 and triggering light barrier system 3, computer system 8 conveys to control command and gathers control module 6 by agreement, require detector module 10 to begin to gather, gather control module and gather the order of control module 6 by parsing, issue beginning acquisition and image data is transmitted and error correction, the data transmission after detector module 10 gathers is in computer reconstruction unit 8.
The effect of scan channel 4 is to provide and is scanned luggage 2 and carries the passage of advancing and the barrier shield of irrelevant X ray.Barrier shield is radiation-resistant material, and this radiation-resistant material can be heavy metal, as lead or steel.
in checking process, being examined luggage 2 is transported in scan channel 4 with the travelling belt of certain speed by conveying device 1, when being examined luggage 2 triggering light barrier systems 3 or photoelectric sensor 3, x-ray source 7 enters out the bundle standby condition, when luggage 2 enters scanning effective coverage 15 when interior, gather control module 6 and control the ray emission points 71 of x-ray source 7 by predetermined time sequence divergent bundle, continuous or interval produces X ray, simultaneously, gather the order that control module 6 issues begin to gather, the correspondence position of detector module 10 begins image data, record simultaneously the time point of institute's image data and the location point of detector module 10, the data that collect by client cables (for example, optical fiber) be transferred in computer reconstruction unit 8, by computer reconstruction unit 8 by the control ray emission points command information of contrast in synchronization and the data message that collects, proofread and correct with data and process, then the data of corresponding position are rebuild, foundation is based on the matrix of the substance characteristics that is scanned luggage 2, undertaken Converse solved by the computing module in computer reconstruction unit 8, draw one or more substance characteristics of the material that the corresponding position is scanned luggage 2, set up the substance characteristics data in a position of fault.Along with luggage 2 moves with certain speed, computer reconstruction unit 8 can successively obtain the substance characteristics data of whole luggage, recognizer by special use is carried out collective analysis and judgement to the layer data characteristic, substance characteristics table in the contrast existing database, draw and be scanned the conclusion that whether comprises the material-specific that the user is concerned about in luggage 2, and show by the display that computer system is connected.
In the utility model, utilize the conversion of ray emission points 71 positions of x-ray source 7, regional by conversion ray emission points and scanning collection, obtain being scanned under different sequential the image data of luggage, and then can utilize traditional computed tomography (being the CT technology), in the situation that do not rotate scanned object or not rotary detector and x-ray source, realize being scanned the tomoscan of luggage.
In the process of computer reconstruction, computing machine is to the layer data precision of rebuilding and the Angular correlation of observing being scanned luggage.The utility model can adopt the x-ray source based on carbon nanomaterial, in the certain-length scope, the spacing between ray emission points can be identical, can carry out programmed control by gathering control module 6, the order of ray emission points divergent-ray can along line spread, can be also to arrange along broken line.Detector can be divided into line detector or planar array type detector, thus the problem of workout cost and system identification precision farthest.
Generally, be scanned luggage and pass through scanning area with certain speed.To scanning demanding occasion, be scanned material and also can keep static in scanning area, after then a mobile section moves, continue static scanning, until scanning is completed.Computer system is distinguished material by the substance characteristics of identification luggage tomography.In process to material identification, system should comprise a kind of substance characteristics at least, as density and atomic number.
No frame CT device of the present utility model has taken into full account the application of CT technology in the safety check field, scan channel, carbon nanometer radiographic source and detector system are considered, solved no frame CT system equipment huge, the problem that acquisition precision is low has realized the rapid and miniaturization of CT technology.
Claims (20)
1. a no frame CT device, is characterized in that, comprising:
Scan channel;
Around the fixed x-ray source that scan channel is arranged, this x-ray source comprises a plurality of ray emission points; And
Around fixed a plurality of detector modules that scan channel is arranged, described a plurality of detector modules and x-ray source are oppositely arranged.
2. no frame CT device according to claim 1, is characterized in that
At least some detector modules when watching in the plane of intersecting with scan channel in described a plurality of detector modules are arranged to roughly L shaped, semicircle, U-shaped, circular arc, parabola shaped or shaped form.
3. no frame CT device according to claim 1 and 2, is characterized in that
At least some in a plurality of ray emission points of described x-ray source are arranged to roughly linear or fold-line-shaped when watching in the plane of intersecting with scan channel.
4. no frame CT device according to claim 3, is characterized in that
Be arranged to first and last extreme ray launching site in the ray emission points of linear roughly or fold-line-shaped and scan channel center line angle and be arranged to first and last end detector module in roughly L shaped detector module and the angle sum of the line at scan channel center greater than 180 degree.
5. no frame CT device according to claim 1, is characterized in that
The direction that the beam that a plurality of ray emission points of described x-ray source are launched advances along scan channel perpendicular to inspected object or perpendicular to scan channel, or tilt with respect to direction or the scan channel that object advances.
6. no frame CT device according to claim 1, is characterized in that
The beam that a plurality of ray emission points of described x-ray source are launched and the ray receiving plane of detector module are in a plane.
7. no frame CT device according to claim 1, is characterized in that
The ray receiving plane head and the tail of detector module are adjacent, make from the ray of a plurality of ray emission points emissions and can not pass through between the ray receiving plane.
8. no frame CT device according to claim 1, is characterized in that
When watching in the plane of intersecting with scan channel, the mid point line of the ray receiving plane of detector receiver module can form two straight lines, and two lines cross at a point.
9. no frame CT device according to claim 1, is characterized in that
A plurality of ray emission points of described x-ray source and the receiving plane of described a plurality of detector modules arrange in same plane, and the direction of beam is substantially vertical with the receiving plane of corresponding detector module.
10. no frame CT device according to claim 1, is characterized in that
Each detector module can receive from least one ray launched in a plurality of ray emission points of x-ray source.
11. no frame CT device according to claim 1 is characterized in that
Ray emission points and detector module in a plurality of ray emission points of described x-ray source and described a plurality of detector module, correspondence are arranged in same plane.
12. no frame CT device according to claim 1 is characterized in that
The above a plurality of ray emission points of direction at scan channel are arranged at least one row.
13. no frame CT device according to claim 1 is characterized in that, also comprises: regulate the front standard apparatus of beam energy, front standard apparatus is arranged between described a plurality of ray emission points and described detector module.
14. no frame CT device according to claim 1 is characterized in that
Described front standard apparatus is to proofread and correct grid.
15. according to claim 13 or 14 described no frame CT devices is characterized in that
The distance of the receiving plane of described front standard apparatus distance detector module is greater than proofreading and correct the distance of grid apart from ray emission points.
16. according to claim 13 or 14 described no frame CT devices is characterized in that
The distance of the receiving plane of described front standard apparatus distance detector module is to proofread and correct grid apart from least 5 times of the distance of ray emission points.
17. no frame CT device according to claim 14 is characterized in that
Described correction grid shape is the matched curve shape.
18. no frame CT device according to claim 1 is characterized in that
Described x-ray source is the carbon nano-tube x-ray source.
19. no frame CT device according to claim 1 is characterized in that
Described x-ray source comprises a plurality of ray emission points with intervening sequences or launches continuously X ray.
20. no frame CT device according to claim 1 is characterized in that
That the ray emission points of described x-ray source is arranged to is L shaped, U-shaped, semicircle, circular arc, parabola shaped or shaped form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736705 CN203012155U (en) | 2012-12-27 | 2012-12-27 | Rackless CT device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736705 CN203012155U (en) | 2012-12-27 | 2012-12-27 | Rackless CT device |
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| Publication Number | Publication Date |
|---|---|
| CN203012155U true CN203012155U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220736705 Expired - Lifetime CN203012155U (en) | 2012-12-27 | 2012-12-27 | Rackless CT device |
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| CN (1) | CN203012155U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901493A (en) * | 2012-12-27 | 2014-07-02 | 同方威视技术股份有限公司 | Rackless CT device |
| WO2014101391A1 (en) * | 2012-12-27 | 2014-07-03 | 同方威视技术股份有限公司 | Fixed ct device |
| CN104567758A (en) * | 2013-10-29 | 2015-04-29 | 同方威视技术股份有限公司 | Three-dimensional imaging system and method thereof |
| CN105092612A (en) * | 2014-05-06 | 2015-11-25 | 阿斯特菲公司 | Computed tomography system for cargo and transported containers |
| CN105738958A (en) * | 2015-09-08 | 2016-07-06 | 同方威视技术股份有限公司 | Safety inspection equipment |
| CN114167506A (en) * | 2020-09-11 | 2022-03-11 | 同方威视技术股份有限公司 | Security check system and method |
| CN114167507A (en) * | 2020-09-11 | 2022-03-11 | 同方威视技术股份有限公司 | Multi-channel static CT device |
-
2012
- 2012-12-27 CN CN 201220736705 patent/CN203012155U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901493B (en) * | 2012-12-27 | 2016-12-28 | 同方威视技术股份有限公司 | A kind of no frame CT device |
| WO2014101391A1 (en) * | 2012-12-27 | 2014-07-03 | 同方威视技术股份有限公司 | Fixed ct device |
| WO2014101392A1 (en) * | 2012-12-27 | 2014-07-03 | 同方威视技术股份有限公司 | Rackless ct device |
| CN103901493A (en) * | 2012-12-27 | 2014-07-02 | 同方威视技术股份有限公司 | Rackless CT device |
| US9551808B2 (en) | 2012-12-27 | 2017-01-24 | Nutech Company Limited | CT apparatus without gantry |
| CN104567758A (en) * | 2013-10-29 | 2015-04-29 | 同方威视技术股份有限公司 | Three-dimensional imaging system and method thereof |
| CN105092612A (en) * | 2014-05-06 | 2015-11-25 | 阿斯特菲公司 | Computed tomography system for cargo and transported containers |
| CN105738958A (en) * | 2015-09-08 | 2016-07-06 | 同方威视技术股份有限公司 | Safety inspection equipment |
| CN114167506A (en) * | 2020-09-11 | 2022-03-11 | 同方威视技术股份有限公司 | Security check system and method |
| CN114167507A (en) * | 2020-09-11 | 2022-03-11 | 同方威视技术股份有限公司 | Multi-channel static CT device |
| WO2022053024A1 (en) * | 2020-09-11 | 2022-03-17 | 同方威视技术股份有限公司 | Multi-channel static ct equipment |
| CN114167506B (en) * | 2020-09-11 | 2023-10-13 | 同方威视技术股份有限公司 | Security check system and method |
| US11906447B2 (en) | 2020-09-11 | 2024-02-20 | Nuctech Company Limited | Multi-channel static CT device |
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Granted publication date: 20130619 |