CN102175699B - Examining system, examining method, CT (computed tomography) device and detecting device - Google Patents
Examining system, examining method, CT (computed tomography) device and detecting device Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 22
- 238000002591 computed tomography Methods 0.000 title abstract 7
- 238000007689 inspection Methods 0.000 claims description 14
- 238000003384 imaging method Methods 0.000 abstract description 4
- 230000002250 progressing effect Effects 0.000 abstract 2
- 230000007547 defect Effects 0.000 abstract 1
- 239000002360 explosive Substances 0.000 description 11
- 239000013078 crystal Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000003814 drug Substances 0.000 description 4
- 229940079593 drug Drugs 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
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- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000013170 computed tomography imaging Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013056 hazardous product Substances 0.000 description 1
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Abstract
The invention provides an examining system, wherein the system comprises a CT (computed tomography) device which comprises a slip ring, a ray source connected to the slip ring, a detecting device opposite to the ray source and connected to the slip ring, and a transmitting device for transmitting examined objects; when the examined objects are progressed and approached to the plane at which the slip ring is positioned, the examined objects are slowed down for progressing at a low speed, and are accelerated for progressing at a high speed after the ray sources stops emitting rays, wherein the detecting device comprises N lines of detectors; a predetermined interval is reserved between two adjacent lines of detectors; N is an integer greater than one. By utilizing the examining system provided by the invention, the high-speed scan imaging of the CT device is realized, and the CT device and a scan imaging device for obtaining two-dimensional images are possibly used synchronously, so that the defects between the CT device and the scan imaging device are overcome.
Description
The application is that application number is 200710176528.4, denomination of invention for " check system, inspection method, CT device and sniffer ", the applying date be the divisional application of the patented claim on October 30th, 2007.
Technical field
The present invention relates to check system, inspection method, CT device and sniffer.
Background technology
In order to solve CT device sweep velocity problem, conventional method is used multi-detector exactly, thereby can gather many rows certificate, for example patented claim WO2005/119297 at every turn simultaneously.But because detector cost is higher, significantly increase row and seem so not real.
Summary of the invention
In the present invention, propose check system, inspection method, CT device and sniffer, wherein sniffer can, in the situation that increasing sniffer useful detection area, effectively reduce detector row, thereby reduce the cost of sniffer.
According to an aspect of the present invention, the present invention proposes a kind of check system, this system comprises: CT device, and this CT device comprises: slip ring, the radiographic source connecting with slip ring, relative with radiographic source and be connected to the sniffer on slip ring; And the conveyer of transmission inspected object, wherein said sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two row, wherein N is greater than 1 integer.
Described preset space length can be 5 to 80mm or 30 to 50mm.
According to a further aspect in the invention, in the inspection area of the every rotating 360 degrees of slip ring, every row's detector checks the fan-shaped part of the 360 degree/N in this region, every rotating 360 degrees/the N of slip ring simultaneously, the distance that conveyer moves object is the centre distance of adjacent two row's detectors, and the first row detector of the upstream side of the conveyer moving direction from described N row detector starts to detect respectively corresponding 360 degree/N to last row's detector successively thus.
According to an aspect of the present invention, described check system: also comprise the scanned imagery device for obtaining two dimensional image, described CT device and describedly can simultaneously move for the scanned imagery device that obtains two dimensional image, to be obtained and to be examined the 3-D view of article and to obtain two dimensional image by described for the scanned imagery device that obtains two dimensional image by CT device simultaneously.
Optimal way is, described CT device and described be 0.18-0.25m/s for obtain the speed that the scanned imagery device of two dimensional image moves simultaneously.
According to the one side of this religious name, the present invention proposes a kind of inspection method, the method comprises: transmit inspected object; And utilize CT device to check this object, wherein this CT device comprises: slip ring, the radiographic source connecting with slip ring, relative with radiographic source and be connected to the sniffer on slip ring, wherein said sniffer comprises N row detector, and there is predetermined interval between the described detecting device of adjacent two row, wherein N is greater than 1 integer
Optimal way is, every rotating 360 degrees/the N of slip ring, the distance that conveyer moves object is the centre distance of adjacent two row's detectors, and the first row detector of the upstream side of the conveyer moving direction from described N row detector starts to detect respectively corresponding 360 degree/N to last row's detector successively thus.
According to an aspect of the present invention, described inspection method also comprises that utilization checks described object for the scanned imagery device that obtains two dimensional image, described CT device and describedly simultaneously move for the scanned imagery device that obtains two dimensional image, to be obtained and to be examined the 3-D view of article and to obtain two dimensional image by described for the scanned imagery device that obtains two dimensional image by CT device simultaneously.
Optimal way is, described CT device and described be 0.18-0.25m/s for obtain the speed that the scanned imagery device of two dimensional image moves simultaneously.
According to an aspect of the present invention, the present invention proposes a kind of CT device, this CT device comprises: slip ring, the radiographic source connecting with slip ring, relative with radiographic source and be connected to the sniffer on slip ring, wherein said sniffer comprises N row detector, and between the described detecting device of adjacent two row, have predetermined interval, wherein N is greater than 1 integer.
In accordance with a further aspect of the present invention, the present invention proposes a kind of sniffer for CT device, described sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two row, and wherein N is greater than 1 integer.
Optimal way is, described preset space length is 5 to 80mm.Preferred mode is that described preset space length is 30 to 50mm.
Brief description of the drawings
These and/or other aspect of the present invention and advantage are understood below in conjunction with becoming in accompanying drawing description of preferred embodiments obviously and easily, wherein:
Fig. 1 is according to the schematic diagram of the check system of the embodiment of the present invention.
Fig. 2 is according to the schematic diagram of the CT device of the embodiment of the present invention.
Fig. 3 is according to the schematic diagram of the sniffer of the embodiment of the present invention.
Fig. 4 describes according to the diagrammatic top view of the arrangement of the detector on the sniffer of the embodiment of the present invention.
Fig. 5 is the structural representation of scintillator detector.
Fig. 6 is the vertical view of scintillator detector.
Fig. 7 is the 3 d effect graph of scintillator detector.
Fig. 8 is the vertical view of the single row detector that is combined into by multiple detector modules.
Fig. 9 is the schematic diagram of the wide detecting for spaces device of many rows.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical label represents identical element from start to finish.Below by embodiment is described with reference to the drawings so as to explain the present invention.
As shown in figs. 1 and 2, check system according to the present invention comprises: CT device, and this CT device comprises: slip ring, the radiographic source connecting with slip ring, relative with radiographic source and be connected to the sniffer on slip ring; And the conveyer of transmission inspected object, wherein said sniffer comprises N row detector, and has predetermined interval between the described detecting device of adjacent two row, wherein N is greater than 1 integer.
In one embodiment of the invention, check system can also comprise the scanned imagery device for obtaining two dimensional image, described CT device and describedly can simultaneously move for the scanned imagery device that obtains two dimensional image, to be obtained and to be examined the 3-D view of article and to obtain two dimensional image by described for the scanned imagery device that obtains two dimensional image by CT device simultaneously.
In the embodiment shown in Fig. 1, check system according to the present invention comprises scanned imagery device and the CT device for obtaining the two-dimensional transmission image that is examined article.The scanned imagery device that acquisition is examined the two dimensional image of article can be existing any type of scanned imagery device, comprises the scanned imagery device of monoenergetic and dual intensity DR.Check system can check explosive and drugs etc.CT imaging device can accurately obtain the information of 3D shape, size, equivalent atom ordinal number Z value and the density D value of object to be detected, the distribution in Z-D figure according to explosive and drugs, can accurately judge above-mentioned prohibited items, it adopts multi-detector structure simultaneously, can add to a great extent fast scan speed, improve currency rate.
Check system according to the present invention also comprises: the belt conveyor being made up of support 1, travelling belt 6, belt position scrambler 5.
For the scanned imagery device that obtains two dimensional image comprise support 2, the radiographic source 7 that connects with support 2, relative with radiographic source 7 and be connected to detector and the data acquisition unit 8 on support 2.
CT device comprises: support 3, be arranged on the slip ring 11 on support 3, the radiographic source 9 connecting with slip ring 11, relative with radiographic source 9 and be connected to detector and data acquisition unit or the sniffer 10 on slip ring 11 rotationally.
In addition, check system according to the present invention also comprises: for the computer data processor 13 of determining the luggage case locating device 4 of luggage case position, process for the data of controlling the control module 12 of check system, obtain for the scanned imagery device to two dimensional image and the computer data processor 14 of processing for the data that CT device is obtained.
Described luggage case locating device 4 can adopt light barrier or other equipment to realize, and for judging starting point and the terminal of luggage case, coordinates belt position scrambler 5, can determine the position of luggage case in luggage passage.
Described detector and data acquisition unit are integral module structure, and data acquisition unit comprises that signal amplifies, A/D converts and data transfer circuit.
Described radiographic source 7 is placed in luggage passage one side, the ray beam that described detector and data acquisition unit 8 are placed in luggage passage opposite side and just radiographic source 7 are being penetrated; Radiographic source 9 and detector and data acquisition unit 10 are all fixed on slip ring 11, the ray beam that detector and data acquisition unit 10 are just penetrating radiographic source 9.
Control module 12 and luggage case locating device 4, belt position scrambler 5, belt conveyer 6, radiographic source 7, detector and data acquisition unit 8, radiographic source 9, detector and data acquisition unit 10, slip ring 11, computer data processor 13, computer data processor 14 are all connected and the duty of synchro control each several part.
The data output cable of detector and data acquisition unit 8 is connected with computer data processor 13, and the data output cable of detector and data acquisition unit 10 is connected with computer data processor 14.
As shown in Figure 2, also can only comprise CT device according to check system of the present invention.
As shown in Figure 3-4, comprise for the sniffer 10 of CT device: multi-detector, wherein has predetermined interval between the described detecting device of adjacent two row.Described multi-detector can be arranged in has the surface of cylindrical substantially.Multi-detector can adopt any suitable arrangement well known in the art, as long as have predetermined interval between the described detecting device of adjacent two row.
T in Fig. 4 represents that adjacent two row's detectors are along the centre distance on the direction of transfer of the travelling belt 6 in Fig. 1, and d represents that detector is along the width on the direction of transfer of the travelling belt 6 in Fig. 1.Described spacing is the difference of t and d.
According to the centre distance t > > d of adjacent two row's detectors in the detector of sniffer 10 of the present invention, thereby effectively reduce crystalline areas, reduced cost.In contrast to single detector, can increase exponentially detection speed.Obviously, do like this and reduced spatial resolution, but consider for different needs, for example explosive detection, spatial resolution requires lower, generally do not constitute a threat to because be less than the explosive of some scale, be also that law allows.
According to an example of the present invention, described preset space length can be 5 to 80mm.
According to another example of the present invention, described preset space length can be 10 to 70mm.
According to another example of the present invention, described preset space length can be 20 to 60mm.
According to another example of the present invention, described preset space length is 30 to 50mm.
According to a further example of the present invention, described preset space length can be 35 to 45mm.
According to another example of the present invention, described preset space length can be 36 to 40mm, or 38mm.
Described preset space length can adopt different spacing as required, and for example, for explosive, in the time that the width d of detector is 2mm, if spacing is 38mm, explosive does not generally constitute a threat to, and is also that law allows.In addition also can be according to actual conditions and the correspondingly spacing of definite detector of legal requiremnt for cutter, rifle etc.
The width d of the common detector is 1-10mm.The present invention also can adopt centre distance to limit the arrangement of multi-detector, and for example, according to an example of the present invention, described centre distance can be 15 to 65mm.According to another example of the present invention, described preset space length can be 25 to 55mm.
According to another example of the present invention, described preset space length can be 35 to 45mm.According to another example of the present invention, described preset space length can be 40mm.
Can be applied to range detector according to detector arrangement of the present invention, such as scintillator detector etc.Taking scintillator detector as example, the structure of detector of the present invention is described below.
As shown in Fig. 5-8, scintillator detector comprises: scintillation crystal; Photodiode; And preamplifier circuit.X-ray bombardment is after scintillation crystal, and scintillation crystal sends visible ray, and this visible ray becomes electric signal by photodiode converts.Electric signal passes to back-end circuit again and processes after amplifier.
Conventionally, consider the problem such as technique and cost, the size of crystal is generally all very little, and large-sized detector is general all by realizations that be stitched together of little module, has both reduced cost and has also been convenient to maintenance.
Fig. 5-7 show a detector module.As shown in Figure 8, multiple module spliced are connected together becomes single row detector, and single row detector can be arranged in a straight line or arc.
By increasing the mode of spacing between adjacent two row's detectors, increase the effective width of detector.Consider that hazardous material detection is to spatial resolution demand, the spacing between adjacent two row's detectors can be set to 80mm.In addition,, in the case of the larger object of inspection size, the spacing between adjacent two row's detectors can be set to larger size, for example, be greater than 80mm.Spacing between adjacent two row's detectors can be selected according to actual conditions.In addition, according to the demand to speed and the control of cost in reality use, carry out the row of choice for use detector.
Can carry out various scanning according to detector of the present invention, for example this detector can be used for circular orbit scan, and this detector can be used for conventional helical orbit scanning, and this detector can be used for meeting the helical orbit scanning of specified conditions.
As example, a kind of scan mode of the present invention is described below with reference to Fig. 9.
The spacing designing between adjacent two row's detectors is t, total N row, and the rotating speed of slip ring is r
0, the speed of travelling belt is s, can design the scan mode that meets following relation:
In the inspection area of the every rotating 360 degrees of slip ring, every row's detector checks the fan-shaped part of the 360 degree/N in this region, every rotating 360 degrees/the N of slip ring simultaneously, the distance that conveyer moves object is the centre distance of adjacent two row's detectors, and the first row detector of the upstream side of the conveyer moving direction from described N row detector starts to detect respectively corresponding 360 degree/N to last row's detector successively thus.
If the initial position of the 1st row's detector is T
0, the 2nd row is T
0-t, the 3rd row is T
0-2t, the like.
Be easy to get by co-relation formula, when slip ring (being detector) rotates 1/N when circle, detector at axial traveling apart from t, so now the position of detector becomes the 1st row T
0+ t, the 2nd row is T
0, the 3rd row is T
0-t, the like.Now, n+1 row detector fall within rotate before the same axial location of n row detector, angle differs
hence one can see that, and when slip ring rotates after a whole circle, N row detector is just booked T
0to T
02 π angles within the scope of+t.
Concrete scanning step will be described below:
1, setting slip ring rotational speed is r
0(r/s), the speed of setting travelling belt is s (m/s), and makes both meet relation
wherein t (m) is adjacent two row detector intervals, and N is detector row.
2, starting control motor makes slip ring and travelling belt according to above-mentioned setting speed uniform motion.
3, in the time that slip ring turns to a certain angle, we are assumed to be 0 degree, control x-ray source and send X ray, and start detector and carry out data acquisition.For sake of clarity, we suppose taking first row detector as benchmark, but are not limited to this.Now first row detector is T with respect to belt position
0, corresponding second row is positioned at T
0-t, N ranking is in T
0-(N-1) t.
4, slip ring rotates to from 0 degree
degree, carries out continuous acquisition to this interval censored data.Because rotating speed and line speed meet
relation, now travelling belt range ability is t.The data area of first row detector collection is, angle direction collection
degree, conveyer belt direction scope is T
0to T
0the data of+t.Now, first row detector is positioned at T
0+ t position, second row is positioned at T
0position, the like, N ranking is in T
0-(N-2) t
5, slip ring from
degree turns to
degree, carries out continuous acquisition to this interval censored data.The scope of easily being known the collection of second row detector by step 4 is, angle direction collection collection
degree, conveyer belt direction scope is T
0to T
0the data of+t.Now, first row detector is positioned at T
0+ 2t position, second row is positioned at T
0+ t position, the like, N ranking is in T
0-(N-3) t.
6, similar step 4 and step 5, slip ring continuous rotation, when N-1 row detector has gathered
degree, T
0to T
0within the scope of+t, when data, N row detector is positioned at T
0position.
7, when N row detector has gathered
degree, T
0to T
0within the scope of+t, when data, complete the data acquisition of one-period.
8,, from step 4-7, we use N row detector, have collected T
0to T
0the data (image data scope schematic diagram when figure below is N=4) of the 0-360 degree within the scope of+t.By these group data are carried out to cross sectional reconstruction, can obtain T
0to T
0faultage image within the scope of+t.
9, due to the continuous operation of slip ring and travelling belt, known step 4-7 is continuous continuous carrying out, thereby can obtain the faultage image of checking matter at each diverse location.
Again taking 4 row's detectors as example, scan mode of the present invention is described below with reference to Fig. 9.
Every row's detector scans respectively the 360/4=90 degree in 360 scopes, gets detector pitch t=40mm.
Slip ring rotating speed is 1.5r/s, can calculate sweep velocity to be:
s＝Nr
0t
s＝4×1.5×0.04＝0.24m/s。
These data can be rebuild by the fan-beam reconstruction algorithm of considering cone angle effects.
In the time that source is 1000mm to detector distance, maximum cone angle:
be less than the limit cone angle 5 that in experience, circular orbit cone-beam is rebuild and spend, can not cause serious reconstruction artifact.According to normal spiral scan reconstruction method, the effective width of detector is 120mm.Equivalence is 60mm (λ=2) to center.If slip ring is with the speed rotation of 1.5r/s, 2 times of pitch are calculated.Wherein 2 times of pitch are the maximum pitch that can rebuild in current known helical reconstruction algorithms.
If detector effective width is q (mm), amplification ratio is λ (λ > 1), and slip ring rotating speed is r
0(r/s), pitch is p, and the fast S of travelling belt can be calculated as follows.
In summary, this scan method can effectively improve sweep velocity.
Described CT device and described can be 0.18-0.25m/s for obtain the speed that the scanned imagery device of two dimensional image moves simultaneously.
For the CT device shown in Fig. 1-2, if slip ring speed adopts 1.5r/s, the focus of radiographic source 9 is 500mm to slip ring centre distance, and the focus of radiographic source 9 is 1000mm to detector distance, and amplification ratio is: λ=1000/500=2.
If adopt four row's detectors, detector crystal size d is 2mm, and adjacent two row's centre distance t are 40mm, and whole detector width is q=120mm, adopts 2 times of pitch to rebuild, and can obtain the transfer rate of belt:
S＝P*r
0*(q/λ)＝2*1.5*(0.120/2)＝0.18m/s
Wherein: " pitch " is an important parameter of helical orbit, in document, the definition of pitch has multiplely, and the distance that in this paper, pitch P is defined as helical orbit two adjacent rings and detector zoom to the ratio of the height after rotation center.Detector effective width is q (mm), and amplification ratio is λ (λ > 1), and slip ring rotating speed is r
0.
In most business with in check system, CT device and for the scanned imagery device that obtains two dimensional image because scanning imagery speed difference is larger, can not use simultaneously.General flow process is in the time that DR is tested with suspicious item, re-uses CT and scans.Increase so undoubtedly the rate of failing to report of system.Adopt CT device of the present invention, realized the high-velocity scanning imaging of CT device, make CT device and use simultaneously and become possibility for obtaining the scanned imagery device of two dimensional image, thus the deficiency between having made up mutually.
Now, be 20mm in the resolution of Z direction (horizontal direction), XY direction (perpendicular) resolution, higher than 10mm, is considered various possible laying methods, detectable minimum volume is about 10cm
3.Common explosive density is at 1.5-1.9g/cm
3between, the minimum explosive of 20g can be detected.Due to impacts such as system noises, it is 50 grams that system actual measurement can detect minimum explosive.
Below with reference to figure Fig. 1,2,4,9, describe according to inspection method of the present invention.
A kind of inspection method according to the present invention comprises: transmit inspected object; And utilize CT device to check this object, wherein this CT device comprises: slip ring, the radiographic source connecting with slip ring, relative with radiographic source and be connected to the sniffer on slip ring, wherein said sniffer comprises N row detector, and between the described detecting device of adjacent two row, have predetermined interval, wherein N is greater than 1 integer.
According to embodiments of the invention, every rotating 360 degrees/the N of slip ring, the distance that conveyer moves object is the centre distance of adjacent two row's detectors, and the first row detector of the upstream side of the conveyer moving direction from described N row detector starts to detect respectively corresponding 360 degree/N to last row's detector successively thus.
Described inspection method can also comprise that utilization checks described object for the scanned imagery device that obtains two dimensional image, described CT device and describedly simultaneously move for the scanned imagery device that obtains two dimensional image, to be obtained and to be examined the 3-D view of article and to obtain two dimensional image by described for the scanned imagery device that obtains two dimensional image by CT device simultaneously.Optimal way is, described CT device and described be 0.18-0.25m/s for obtain the speed that the scanned imagery device of two dimensional image moves simultaneously.
Describe the operation of check system of the present invention in detail below with reference to Fig. 1 and 2.
1. connect the power supply of luggage case locating device 4, belt position scrambler 5, belt conveyer 6, radiographic source 7, detector and data acquisition unit 8, radiographic source 9, detector and data acquisition unit (detector) 10, the slip ring 11 controlled by control module 12, computer data processor 13, computer data processor 14, under the control of control module 12, belt high-speed cruising, slip ring 11 starts, with specific speed rotation, then luggage case to be positioned on belt.
2. luggage case marches to luggage case locating device 4, and luggage case locating device 4 is determined the starting point of luggage case; Control module 12 is according to the position of the counting real-time follow-up luggage case of this starting point and belt position scrambler 5; When luggage case leaves luggage case locating device 4, luggage case locating device 4 is determined the terminal of luggage cases, and control module 12 can calculate the length of luggage case according to the starting point of luggage case and terminal.
3. luggage case marches to while approaching radiographic source 7 and detector and data acquisition unit 8 place plane, and radiographic source 7 starts divergent-ray.The ray that radiographic source 7 is launched is through object to be detected and by just the detector to ray beam and data acquisition unit 8 receive and form data for projection.Control module 12 is controlled detector and data acquisition unit 8 according to certain speed sampling, and the data for projection that sampling obtains is sent to computer data processor 13.In the time that the terminal of luggage case leaves radiographic source 7 and detector and data acquisition unit 8 place plane, radiographic source 7 stops divergent-ray.
4. computer data processor 13 is proofreaied and correct, is rebuild data for projection, obtains the two dimensional image of object to be detected.
5. luggage case marches to while approaching slip ring 11 place plane, and radiographic source 9 starts divergent-ray.The ray that radiographic source 9 is launched receives and forms data for projection through object to be detected and by the detector to ray beam and data acquisition unit (detector) 10 just.Control module 12 is controlled slip ring 11 with the rotation of certain speed, simultaneously detector and data acquisition unit 10 also under the control of control module 12 according to certain speed sampling.The data for projection that sampling obtains is sent to computer data processor 14.In the time that the terminal of luggage case leaves slip ring 11 place plane, radiographic source 9 stops divergent-ray.Optimal way is, luggage case marches to while approaching slip ring 11 place plane, belt be decelerated to that low speed is advanced and, after radiographic source 9 stops divergent-ray, belt accelerates at a high speed and advances.
6. in the time can not judging by X-Y scheme whether object to be detected comprises explosive or drugs, the equivalent atom ordinal number and the density information that obtain object to be detected can be proofreaied and correct data for projection, be rebuild to computer data processor 14, utilize the data of suspicion thing in these information comparison databases, and make final judgement in conjunction with size and the shape of suspicion thing, and intuitively show the detection information of inspected object, in two-dimension projection, mark suspicion thing if any suspicion thing.
Adopt the sniffer of present design, not only can be for security staff provides familiar X-Y scheme, and can provide accurate 3 Vc T to rebuild images, for whether security staff is to keeping explosive in luggage case and drugs provide basis for estimation comprehensively and accurately.
Claims (6)
1. check a system for prohibited items, this system comprises:
CT device, this CT device comprises: slip ring, the radiographic source connecting with slip ring, relative with radiographic source and be connected to the sniffer on slip ring; And
Transmit the conveyer of inspected object, inspected object marches to while approaching slip ring place plane, and be decelerated to that low speed is advanced and after radiographic source stops divergent-ray, accelerate at a high speed and advance,
Wherein said sniffer comprises N row detector, and has preset space length between the described detector of adjacent two row, and wherein N is greater than 1 integer, and
In the inspection area of the every rotating 360 degrees of slip ring, every row's detector checks the fan-shaped part of the 360 degree/N in this region, the every rotating 360 degrees/N of slip ring simultaneously, and the distance that conveyer moves object is the centre distance of adjacent two row's detectors,
Described system also comprises the scanned imagery device for obtaining two dimensional image, described CT device and describedly can simultaneously move for the scanned imagery device that obtains two dimensional image, to obtain the 3-D view of inspected object and to obtain two dimensional image by described for the scanned imagery device that obtains two dimensional image by CT device simultaneously
Wherein said CT device and described be 0.18-0.25m/s for obtain the speed that the scanned imagery device of two dimensional image moves simultaneously.
2. system according to claim 1, wherein
Described preset space length is 5 to 80mm.
3. system according to claim 1, wherein
Described preset space length is 30 to 50mm.
4. a method that checks prohibited items, comprising:
Transmit inspected object; And
Utilize CT device to check this object, wherein this CT device comprises: slip ring, the radiographic source connecting with slip ring, relative with radiographic source and be connected to the sniffer on slip ring, inspected object marches to while approaching slip ring place plane, be decelerated to that low speed is advanced and after radiographic source stops divergent-ray, inspected object accelerates at a high speed and advances
Wherein said sniffer comprises N row detector, and has preset space length between the described detector of adjacent two row, and wherein N is greater than 1 integer,
In the inspection area of the every rotating 360 degrees of slip ring, every row's detector checks the fan-shaped part of the 360 degree/N in this region, the every rotating 360 degrees/N of slip ring simultaneously, and the distance that conveyer moves object is the centre distance of adjacent two row's detectors,
Described method also comprises that utilization checks described object for the scanned imagery device that obtains two dimensional image, described CT device and describedly simultaneously move for the scanned imagery device that obtains two dimensional image, to obtain the 3-D view of inspected object and to obtain two dimensional image by described for the scanned imagery device that obtains two dimensional image by CT device simultaneously
Wherein said CT device and described be 0.18-0.25m/s for obtain the speed that the scanned imagery device of two dimensional image moves simultaneously.
5. method according to claim 4, wherein
Described preset space length is 5 to 80mm.
6. method according to claim 4, wherein
Described preset space length is 30 to 50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010621644.4A CN102175699B (en) | 2007-10-30 | 2007-10-30 | Examining system, examining method, CT (computed tomography) device and detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010621644.4A CN102175699B (en) | 2007-10-30 | 2007-10-30 | Examining system, examining method, CT (computed tomography) device and detecting device |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710176528A Division CN101424648B (en) | 2007-10-30 | 2007-10-30 | Check system, and check method |
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| Publication Number | Publication Date |
|---|---|
| CN102175699A CN102175699A (en) | 2011-09-07 |
| CN102175699B true CN102175699B (en) | 2014-10-22 |
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| CN106996939B (en) * | 2017-04-07 | 2024-09-24 | 清华大学 | Tomographic inspection apparatus |
| CN111272786A (en) * | 2020-03-30 | 2020-06-12 | 赵磊 | CT scanning imaging system |
| CN112557425B (en) * | 2020-12-24 | 2023-01-10 | 北京航星机器制造有限公司 | CT detection device and tape stop control method |
| CN115598717B (en) * | 2021-07-07 | 2024-05-14 | 同方威视技术股份有限公司 | Inspection system and method |
| CN115598715B (en) * | 2021-07-07 | 2024-10-15 | 同方威视技术股份有限公司 | Inspection system and method |
| CN115113289B (en) * | 2021-07-07 | 2024-04-26 | 同方威视技术股份有限公司 | Inspection system and method |
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| Polad M. Shikhaliev et al.Photon counting computed tomography:Concept and initial results.《Medical Physics》.2005, * |
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