CN202948145U - CT system and detecting device applied to the CT system - Google Patents
CT system and detecting device applied to the CT system Download PDFInfo
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- CN202948145U CN202948145U CN 201220496589 CN201220496589U CN202948145U CN 202948145 U CN202948145 U CN 202948145U CN 201220496589 CN201220496589 CN 201220496589 CN 201220496589 U CN201220496589 U CN 201220496589U CN 202948145 U CN202948145 U CN 202948145U
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- energy detector
- high energy
- low energy
- detector assembly
- sniffer
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Abstract
The utility model provides a CT system and a detecting device applied to the CT system. The detecting device comprises a low-energy detector assembly and a high-energy detector assembly arranged below the low-energy detector assembly. The high-energy detector assembly comprises multiple rows of high-energy detectors. The high-energy detectors are arranged with a predetermined gap therebetween. The detecting device which significantly reduces the detectors and data acquisition units achieves high-resolution three-dimension CT images and also realizes high-accuracy dangerous material alarming. The system is ensured to have high performances. Meanwhile, the manufacture cost of the system is greatly lowered.
Description
Technical field
The utility model relates to a kind of CT system and a kind of sniffer for the CT system.
Background technology
In order to solve CT system scan speed issue, conventional method is used area array detector exactly, can gather simultaneously many rows according to improving sweep velocity at every turn.Along with the requirement to the pin-point accuracy of dangerous material identification of safety check field, the dual intensity technical need is more and more urgent.Realize high-velocity scanning and high-resolution three-dimension dual intensity image, conventional method is that the height detector all adopts face array arrangement method, and the required detector of this system and data acquisition unit quantity are huge, and system's manufacturing cost is very high.
The utility model content
The purpose of this utility model is to provide a kind of CT system and a kind of sniffer for the CT system, thus in the situation that guarantee that high dangerous material recognition performance reduces costs.
According to one side of the present utility model, the utility model provides a kind of sniffer for the CT system, and this sniffer comprises: the low energy detector assembly; And being arranged on high energy detector assembly under described low energy detector assembly, wherein said high energy detector assembly comprises; Many row's high energy detectors have preset space length between described high energy detector.
According to one side of the present utility model, described sniffer also comprises filter plate, and described filter plate is arranged between low energy detector assembly and described high energy detector assembly.
According to one side of the present utility model, described CT system transmits inspected object on direction of transfer, and described many row's high energy detectors are roughly arranged on direction of transfer.
According to one side of the present utility model, described low energy detector assembly comprises the low energy detector of face array.
According to one side of the present utility model, the low energy detector of described array roughly is distributed on the face of cylinder.
According to one side of the present utility model, each in described high energy detector towards the surface of described low energy detector assembly substantially on the face of cylinder.
According to one side of the present utility model, the preset space length between described high energy detector is 5 to 80 millimeters.
According to one side of the present utility model, the preset space length between described high energy detector is 30 to 50 millimeters.
According to one side of the present utility model, described sniffer also comprises the parts that are arranged between adjacent described high energy detector.
According to one side of the present utility model, described parts are made by ray absorbent material.
According to one side of the present utility model, described parts are made by at least a alloy at least a or aluminium, iron, copper and lead in aluminium, iron, copper and lead.
According to one side of the present utility model, described high energy detector assembly and become to obtain dual intensity CT image with the section construction of the low energy detector of the overlapping low energy detector assembly of the high energy detector of described high energy detector assembly.
According to one side of the present utility model, the utility model provides a kind of CT system, and this CT system comprises: the conveyer that transmits inspected object on direction of transfer; Slip ring; The radiographic source that is connected with slip ring; And relative with radiographic source and be connected to sniffer on slip ring, wherein said sniffer comprises: the low energy detector assembly; And being arranged on high energy detector assembly under described low energy detector assembly, wherein said high energy detector assembly comprises; Many row's high energy detectors have preset space length between described high energy detector.
According to one side of the present utility model, described many row's high energy detectors are roughly arranged on direction of transfer.
According to one side of the present utility model, the every rotating 360 degrees/N of described slip ring, the distance that conveyer moves inspected object is the centre distance of adjacent two row's detectors, wherein N is the row of high energy detector.
According to one side of the present utility model, N is the row of high energy detector, every rotating 360 degrees/the N of described slip ring, the distance that conveyer moves inspected object is the centre distance of adjacent two row's detectors, described sniffer is exported data thus, and based on the described data of exporting, rebuild the image of inspected object.
Optimal way is based on the described data of output, to utilize the cross sectional reconstruction method to rebuild the image of inspected object.
According to one side of the present utility model, described high energy detector assembly and become to obtain dual intensity CT image with the section construction of the low energy detector of the overlapping low energy detector assembly of the high energy detector of described high energy detector assembly.
According to one side of the present utility model, described low energy detector assembly obtains low energy CT image, and high energy detector assembly and obtain dual intensity CT image with the part of the low energy detector of the overlapping low energy detector assembly of the high energy detector of described high energy detector assembly, by low energy CT image and dual intensity CT image are carried out fusion treatment, obtain thus three-dimensional dual intensity CT image.
According to one side of the present utility model, described low energy detector assembly comprises the low energy detector of face array.
The utility model proposes that low energy detector face array is arranged, high energy detector is sparse arranges, greatly reduced thus detector and data acquisition unit, both obtained high-resolution three dimensional CT image, realized that again the dangerous material of pin-point accuracy are reported to the police.Guaranteeing to greatly reduce the manufacturing cost of system under high system performance.
Description of drawings
Fig. 1 is the schematic diagram according to the CT system that is used for luggage safety checking of embodiment of the present utility model;
Fig. 2 is the schematic diagram according to the sniffer that is used for the CT system of embodiment of the present utility model;
Fig. 3 is the schematic diagram according to the CT system that is used for luggage safety checking of embodiment of the present utility model;
Fig. 4 is the constructed profile according to the sniffer that is used for the CT system of embodiment of the present utility model; And
Fig. 5 is the constructed profile according to the sniffer that is used for the CT system of embodiment of the present utility model.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the utility model is described further.
As shown in figs. 1 and 3, the CT system 10 according to embodiment of the present utility model comprises: the conveyer 17 that transmits inspected object on direction of transfer V; The slip ring 12 that can rotate around rotation, rotation can with direction of transfer V almost parallel; The radiographic source 11 that is connected with slip ring 12; Relative with radiographic source 11 and be connected to sniffer 16 on slip ring 12, sniffer 16 and radiographic source 11 can rotate with slip ring 12 together; Be used for to control the control device 18 of CT system 10 operations; Be used for data processing equipment 15 that the data that sniffer 16 detects are processed; And the warning device 19 of reporting to the police when having suspicious item in inspected object.
As shown in Fig. 2 and 4, sniffer 16 comprises low energy detector assembly 1; And be arranged on high energy detector assembly 3 under described low energy detector assembly 1.
As shown in Fig. 2 and 4, low energy detector assembly 1 comprises the low energy detector of face array.The low energy detector of face array roughly is distributed on the face of cylinder, and roughly by the focus of radiographic source 11, perhaps the central axis on the described face of cylinder is roughly parallel to the rotation of slip ring 12 to the central axis on the described face of cylinder.As selection, the center of each low energy detector of face array can be distributed in focus take radiographic source 11 on the circular arc in the center of circle.
As shown in Fig. 2 and 4, high energy detector assembly 3 comprises many row's high energy detectors 31, has preset space length between described high energy detector 31.Many row's high energy detectors 31 are roughly arranged on direction of transfer V.Each in high energy detector 31 towards the surface of described low energy detector assembly 1 substantially on the face of cylinder, roughly by the focus of radiographic source 11, perhaps the central axis on the described face of cylinder is roughly parallel to the rotation of slip ring 12 to the central axis on the described face of cylinder.In addition, arrange high energy detector more and can adopt any suitable arrangement well known in the art.Described high energy detector assembly and become to obtain dual intensity CT image with the section construction of the low energy detector of the overlapping low energy detector assembly of the high energy detector of described high energy detector assembly.Described low energy detector assembly is configured to obtain low energy CT image, by low energy CT image and dual intensity CT image are carried out fusion treatment, obtains thus three-dimensional dual intensity CT image.
As shown in Fig. 2 and 4, between low energy detector assembly 1 and high energy detector assembly 3, filter plate 2 can be set.The thickness of filter plate decides according to the energy of the X ray of radiographic source 11 emissions.Filter plate 2 absorbs a part of ray energy, the energy difference distance of surveying effectively to pull open high low energy detector.The material of filter plate 2 can be copper, silver or golden, or cupric, silver or golden alloy material etc.
Low energy detector and high energy detector can be formed by the same scintillator material, and perhaps low energy detector and high energy detector can be formed by different scintillator materials.Scintillator material can be selected from a kind of in following material: CsI (Tl), CdWO4, GOS, ZnSe, YAG.
As shown in Figure 5, according to a kind of embodiment of the present utility model, sniffer 16 also comprises the parts 4 that are arranged between adjacent described high energy detector 31.Described parts 4 are made by ray absorbent material.For example, described parts 4 are made by at least a alloy at least a or aluminium, iron, copper and lead in aluminium, iron, copper and lead.Parts 4 can suppress scattered signal, and can play the effect of certain radiation-screening.
As shown in figs. 1 and 3, conveyer 17 can comprise travelling belt 7, these travelling belt 7 horizontal positioned, and the surfaces of revolution of slip ring 12 is can be roughly vertical with the surface level of travelling belt 7 or can be roughly vertical with direction of transfer V.
High energy detector and the distribution of low energy detector on the surfaces of revolution of slip ring 12 can be circular-arc, can be the circular arcs that a plurality of flat panel detectors are spliced into.High energy detector and the distribution of low energy detector in the surfaces of revolution can be adopted and meet scan channel and require various forms with the CT system requirements.
As selection, low energy detector assembly 1 can comprise than the row's of manying high energy detector arranges more intensive many rows low energy detector.The orientation that should arrange the low energy detectors consistent with the orientation of many row's high energy detectors more, and every row's high energy detector has with it overlapping low energy detector.
In the safety inspection process, luggage is placed on travelling belt 7 and moves horizontally, slip ring 12 rotation, and slip ring 12 drives radiographic sources 11 and sniffer 16 rotations, and the rotation of slip ring 12 can be parallel with surface level, is helical cone-beam scanning to the scanning process of luggage.Control device 18 is controlled the action of travelling belt 7 and slip ring 12, controls the data acquisition that bundle and sniffer 16 of radiographic source 11.Data processing equipment 15 obtains data that sniffer 16 detects, carries out data processing, user interactive and notice warning device 19.Warning device 19 is responsible for sending alerting signal.
The data of the low energy detector of face array undergo reconstruction and can obtain high-resolution image.Many row's high energy detectors and obtain the dual intensity data for projection together with the overlapping low energy detector of many rows high energy detector obtain CT image, the dual intensity CT image that this CT image can be large bed thickness by this dual intensity data for projection.Calculate the information that can accurately obtain the high low energy attenuation coefficient images of object to be detected, equivalent atom ordinal number Z value and density D value through algorithm, the distribution in Z-D figure according to explosive and drugs can accurately judge above-mentioned prohibited items.The dual intensity CT image of high-resolution low energy CT image and large bed thickness is carried out fusion treatment, and whole CT system can obtain high-resolution three-dimensional dual intensity CT image.Based on high-resolution image, can provide the position of the contraband goodss such as drugs, explosive, further can analyze shape, size and the quality of contraband goods.This CT system has realized the comprehensive benefit of high-definition picture, cost control and material identification.
The data for projection that the low energy detector obtains can be used various method for reconstructing, such as the FDK algorithm is realized.The data for projection of dual intensity sniffer data acquisition can be used various classic algorithm, realizes as iterative algorithm, FDK algorithm or cross sectional reconstruction, uses sill decomposition or economic benefits and social benefits to answer decomposition method to realize material identification.
Comprise according to the major function of CT of the present utility model system:
1. can carry out the scanning of CT helical cone-beam to article such as case and bag;
2. can obtain high-resolution low energy CT sectioning image and 3-D view;
3. can obtain the dual intensity CT sectioning image of large bed thickness;
4. obtain high-resolution dual intensity CT image by image interfusion method;
5. can present and identify cutter, gun etc. according to three-dimensional dual intensity CT image;
6. thereby the atomic number, density and the high low energy attenuation coefficient images data that obtain case and bag according to dual intensity CT view data can be identified checking matter whether drug hidden, explosive and other contraband goodss; And
7. position, size, classification and the weight that can obtain drugs, explosive and contraband goods are estimated.
Below, the concrete operations mode according to the high energy detector 31 of CT of the present utility model system is described.
The centre distance that designs adjacent two row's high energy detectors 31 is t, total N row (wherein N is the integer greater than 1), and the rotating speed of slip ring is r
0, the speed of travelling belt is s, can design the scan mode that satisfies following relation:
in the inspection area of slip ring 12 every rotating 360 degrees, every row's high energy detector 31 checks the fan-shaped part of the 360 degree/N in this zone, every rotating 360 degrees/the N of while slip ring, conveyer 17 is the centre distance t of adjacent two row's detectors with the distance of movement of objects, the first row detector of the upstream side of the conveyer 17 moving direction V from described N row high energy detector 31 begins to detect respectively 360 corresponding degree/N to last row's detector successively thus, described sniffer is exported data thus, and based on the described data of exporting, for example, utilize the cross sectional reconstruction method, rebuild the image of inspected object.
If the initial position of the 1st row's high energy detector 31 is T
0, the 2nd row is T
0-t, the 3rd row is T
0-2t, the like.
Be easy to get by the co-relation formula, when slip ring 12 (being detector 31) rotates the 1/N circle, with respect to mobile inspected object high energy detector 31 slip ring 12 axially on walked apart from t, so this moment detector the position become the 1st row and be T
0+ t, the 2nd row is T
0, the 3rd row is T
0-t, the like.At this moment, n+1 row high energy detector falls within and the same axial location that rotates front n row detector, and angle differs 2 π/N.Hence one can see that, and after slip ring rotated a whole circle, N row high energy detector just was booked T
0To T
02 π angles in+t scope.
For the dual intensity data for projection that high low energy detector obtains, can rebuild with various method for reconstructing in theory.As mentioned above, after slip ring rotated a whole circle, N row high energy detector just was booked T
0To T
02 π angles in+t scope.So can preferably rebuild the method simple and fast with the cross sectional reconstruction method.
As shown in Figure 4, the t in figure represents adjacent two row's high energy detectors along the centre distance on the direction of transfer V of travelling belt 17, and d represents that detector 31 is along the width of V on the direction of transfer of travelling belt 17.Described spacing is the difference of t and d.Spacing between high energy detector 31 can be 5 to 80 millimeters, 10 to 70 millimeters, 20 to 60 millimeters, 30 to 50 millimeters, 35 to 45 millimeters, 36 to 40 millimeters, perhaps 38 millimeters.
The centre distance t of adjacent two row's detectors in detector according to sniffer of the present utility model＞＞d, thus effectively reduce crystalline areas, reduced cost.In contrast to single detector, can increase exponentially detection speed.
Can carry out image co-registration to the CT image of low energy, high low energy attenuation coefficient images, density image, atomic number image according to CT of the present utility model system, present the image that various clients need.The dual intensity CT image of high-resolution low energy CT image and large bed thickness is carried out fusion treatment, whole system can obtain high-resolution three-dimensional dual intensity CT image, carry out the dangerous material Intelligent Recognition by dual intensity CT image and process, obtain the dangerous material recognition result of pin-point accuracy.In addition, also can obtain by the method for interpolation high-resolution density image and atomic number image.
Claims (18)
1. a sniffer that is used for the CT system, is characterized in that, comprising:
The low energy detector assembly; And
Be arranged on the high energy detector assembly under described low energy detector assembly, wherein said high energy detector assembly comprises many row's high energy detectors, has preset space length between described high energy detector.
2. the sniffer for the CT system according to claim 1, is characterized in that, also comprises:
Filter plate, described filter plate are arranged between low energy detector assembly and described high energy detector assembly.
3. the sniffer for the CT system according to claim 1, is characterized in that, described CT system transmits inspected object on direction of transfer, and described many row's high energy detectors are roughly arranged on direction of transfer.
4. the sniffer for the CT system according to claim 1, is characterized in that, described low energy detector assembly comprises the low energy detector of face array.
5. the sniffer for the CT system according to claim 4, is characterized in that, the low energy detector of described array roughly is distributed on the face of cylinder.
6. the sniffer for the CT system according to claim 1, is characterized in that, each in described high energy detector towards the surface of described low energy detector assembly substantially on the face of cylinder.
7. the sniffer for the CT system according to claim 1, is characterized in that, the preset space length between described high energy detector is 5 to 80 millimeters.
8. the sniffer for the CT system according to claim 1, is characterized in that, the preset space length between described high energy detector is 30 to 50 millimeters.
9. the sniffer for the CT system according to claim 1, is characterized in that, also comprises the parts that are arranged between adjacent described high energy detector.
10. the sniffer for the CT system according to claim 9, is characterized in that,
Described parts are made by ray absorbent material.
11. according to claim 1 or 4 described sniffers for the CT system is characterized in that,
Described high energy detector assembly and become to obtain dual intensity CT image with the section construction of the low energy detector of the overlapping low energy detector assembly of the high energy detector of described high energy detector assembly.
12. a CT system is characterized in that, comprising:
Transmit the conveyer of inspected object on direction of transfer;
Slip ring;
The radiographic source that is connected with slip ring; And
Relative with radiographic source and be connected to sniffer on slip ring, wherein said sniffer is sniffer according to claim 1.
13. CT according to claim 12 system is characterized in that, described many row's high energy detectors are roughly arranged on direction of transfer.
14. CT according to claim 13 system is characterized in that, the every rotating 360 degrees/N of described slip ring, and the distance that conveyer moves inspected object is the centre distance of adjacent two row's detectors, wherein N is the row of high energy detector.
15. CT according to claim 13 system, it is characterized in that, N is the row of high energy detector, every rotating 360 degrees/the N of described slip ring, the distance that conveyer moves inspected object is the centre distance of adjacent two row's detectors, described sniffer is exported data thus, and based on the described data of exporting, rebuilds the image of inspected object.
16. CT according to claim 12 system is characterized in that,
Described high energy detector assembly and become to obtain dual intensity CT image with the section construction of the low energy detector of the overlapping low energy detector assembly of the high energy detector of described high energy detector assembly.
17. CT according to claim 12 system, it is characterized in that, described low energy detector assembly obtains low energy CT image, and high energy detector assembly and obtain dual intensity CT image with the part of the low energy detector of the overlapping low energy detector assembly of the high energy detector of described high energy detector assembly, by low energy CT image and dual intensity CT image are carried out fusion treatment, obtain thus three-dimensional dual intensity CT image.
18. CT according to claim 17 system is characterized in that described low energy detector assembly comprises the low energy detector of face array.
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| CN 201220496589 CN202948145U (en) | 2012-09-26 | 2012-09-26 | CT system and detecting device applied to the CT system |
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|---|---|---|---|
| CN 201220496589 CN202948145U (en) | 2012-09-26 | 2012-09-26 | CT system and detecting device applied to the CT system |
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| CN103675931A (en) * | 2012-09-26 | 2014-03-26 | 同方威视技术股份有限公司 | CT system and detecting device used for same |
| CN103792565A (en) * | 2014-01-14 | 2014-05-14 | 北京国药恒瑞美联信息技术有限公司 | Photon digital detector |
| WO2015196857A1 (en) * | 2014-06-25 | 2015-12-30 | 清华大学 | Detector device, dual energy ct system and detection method using same |
| CN105510363A (en) * | 2015-12-29 | 2016-04-20 | 同方威视技术股份有限公司 | Device, system and method for double-energy detection |
| CN105758873A (en) * | 2015-03-04 | 2016-07-13 | 公安部第研究所 | CT detection device and data processing method thereof |
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| CN111157555A (en) * | 2019-12-20 | 2020-05-15 | 北京航星机器制造有限公司 | High-energy sparse CT detector, CT detection system and detection method |
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| CN105758873A (en) * | 2015-03-04 | 2016-07-13 | 公安部第研究所 | CT detection device and data processing method thereof |
| CN105758873B (en) * | 2015-03-04 | 2019-12-31 | 公安部第一研究所 | CT detection device and data processing method thereof |
| CN105510363A (en) * | 2015-12-29 | 2016-04-20 | 同方威视技术股份有限公司 | Device, system and method for double-energy detection |
| US10401308B2 (en) | 2015-12-29 | 2019-09-03 | Nuctech Company Limited | Dual-energy detection apparatus, system and method |
| CN107202801A (en) * | 2016-03-16 | 2017-09-26 | 临沂大学 | A kind of computed tomograph scanner system |
| WO2020125080A1 (en) * | 2018-12-17 | 2020-06-25 | 同方威视技术股份有限公司 | Ct system and detection device for ct system |
| US11768163B2 (en) | 2018-12-17 | 2023-09-26 | Nuctech Company Limited | CT system and detection device for CT system |
| CN111157555A (en) * | 2019-12-20 | 2020-05-15 | 北京航星机器制造有限公司 | High-energy sparse CT detector, CT detection system and detection method |
| EP4187287A3 (en) * | 2021-11-26 | 2023-08-16 | Nuctech Company Limited | Area array detector, detection method and corresponding container/vehicle inspection system |
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| CX01 | Expiry of patent term |
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| CX01 | Expiry of patent term |