CN105759318A - Safety detection apparatus and detection method thereof - Google Patents
Safety detection apparatus and detection method thereof Download PDFInfo
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- CN105759318A CN105759318A CN201510100213.6A CN201510100213A CN105759318A CN 105759318 A CN105759318 A CN 105759318A CN 201510100213 A CN201510100213 A CN 201510100213A CN 105759318 A CN105759318 A CN 105759318A
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Abstract
The invention relates to a safety detection apparatus and a detection method thereof. The safety detection apparatus comprises a CT detection apparatus and a multi-view detection apparatus, wherein the CT detection apparatus and the multi-view detection apparatus share one detection channel. The safety detection apparatus further comprises a transmission apparatus which passes through the detection channel of the CT detection apparatus and the detection channel of the multi-view detection apparatus. The safety detection method comprises a detected object passing through the CT detection apparatus and the multi-view detection apparatus, or the detected object passing through the multi-view detection apparatus and the CT detection apparatus. The advantages are as follows: the multi-view detection apparatus and the CT detection apparatus are combined for application, three-dimensional tomography structure information of the detected object is obtained by use of the CT detection apparatus, and thus the detection precision of the detected object is improved; and at the same time, the multi-view detection apparatus makes up for the disadvantage of lowered atomic number detection precision of the CT detection apparatus in a high-density metal object environment, and the precision of the whole detection apparatus is improved while the equipment cost is decreased.
Description
Technical field
The present invention relates to safety detection technology field, be specifically related to a kind of safety detection device and detection method thereof.
Background technology
For explosive detection, the technological means that present stage is commonly used in the world is roughly divided into X-ray detection technology, neutron detection technology, electromagnetic surveying technology, steam traces Detection Techniques, and X-ray technology is owing to himself having the specific advantage that the safety inspection technology being most widely used at present.X-ray safety inspection technology mainly includes monoenergetic fluoroscopy techniques, dual intensity fluoroscopy techniques, various visual angles technology, backscattering technique, monoenergetic spectrum CT technology, dual intensity CT technology etc..Monoenergetic fluoroscopy techniques is the X ray safety check technology used the earliest, and it can only obtain the shape information of object in parcel, and cannot obtain material information, has been phased out at present, but has required that relatively low occasion is still being used in some detection.Dual intensity fluoroscopy techniques is to use maximum technological means in the technology of radioscopy safety check in the market, and it is peeled off means by material and obtains without the object high mental retardation projection under object circumstance of occlusion, and then determines the atomic number information of material.Although dual intensity perspective imaging technology can be similar to the effective atomic number determining material, but but cannot obtain the density information of object, various visual angles technology compensate for this shortcoming to a certain extent, this technology is rebuild by various visual angles projection CT can obtain approximate dangerous materials thickness information, based on thickness information and projection value, it is possible to the approximate density determining material.Owing to being difficult to rebuild exactly object section by the projection under a small amount of several visual angles, therefore the detecting error of this technology is relatively large.Backscattering technique is due to the sensitivity to low atomic number, high-density matter, and the detection packet that are used for wrap up in the dangerous goods on top layer more.And X ray computer fault imaging (CT, ComputedTomography) technology as a kind of important contactless in look detection means, play more and more important effect in medical diagnosis, Non-Destructive Testing, safety inspection field.Especially in safety inspection field, CT type equipment is traffic safety office of the current U.S. (TSA, TransportationSecurityAdministration) EDS (ExplosiveDetectionSystem) the type rays safety detection apparatus of unique authentication, reflects the x-ray ct technology status in safety inspection technical field.Usual x-ray ct technology can be divided into again monoenergetic spectrum CT technology and multi-power spectrum CT technology, monoenergetic spectrum CT technology can obtain the attenuation coefficient information (being equivalent to density by converting) of material, this technology is simply indiscriminately imitated by medicine CT technology, density information can only be obtained, therefore still there is certain limitation.And the X ray dual intensity CT technology in multi-power spectrum CT technology is owing to can obtain atomic number and the density information of material simultaneously, in X-ray safety inspection technology, there is the highest detection accuracy, in safety inspection, therefore obtain increasing application.But from the cost of equipment, the cost of monoenergetic spectrum CT will significantly lower than the cost of multi-power spectrum CT.It addition, even for multi-power spectrum CT, such as the most frequently used dual intensity CT, if there is high desnity metal object in detected luggage, the parsing precision of its atomic number can be decreased obviously.
The Chinese patent that publication number is CN101470082A discloses article detection apparatus and detection method thereof, this device includes an x-ray system and a CT system, the information of comprehensive utilization x-ray system collection and the information of CT system acquisition carry out the differentiation of dangerous materials, to increase the data message for judging, improve the precision differentiated.This device is just with the x-ray system at single visual angle, and simple in construction, precision are low.
The system and method for publication number a kind of many scanneies that have been the International Patent Publication of EP2676128A2, this system comprises a CT device and a multipotency scanner, during detection, object first passes around CT device, utilizes the information that the fault information of CT and multipotency scanner below obtain to combine the differentiation carrying out dangerous materials.The detection pattern that the CT that this device not adopts combines with various visual angles equipment.
Summary of the invention
It is an object of the invention to overcome deficiency of the prior art, it is provided that a kind of high-precision safety detection device and detection method thereof.
The present invention is achieved by the following technical solutions:
A kind of safety detection device, shares a sense channel including CT detecting device and the various visual angles detecting device being arranged at CT detecting device side, described CT detecting device and various visual angles detecting device；
Described CT detecting device and first controls and data handling machine connects；The inside of various visual angles detecting device is provided with various visual angles detector and radiation source module, and described various visual angles detector and second controls and data handling machine connects；Described first control and data handling machine, the second control and data handling machine are all connected with integrated data processing computer；
Described safety detection device also includes transmitting device, and described transmitting device passes the sense channel of CT detecting device and the sense channel of various visual angles detecting device.
Described technical scheme is preferably, and described CT detecting device includes CT radiation source module, CT frame, CT detector, and described CT radiation source module and CT detector may be contained within CT frame.
Described technical scheme is preferably, and described CT detecting device adopts the one in monoenergetic spectrum CT detecting device, multi-power spectrum CT detecting device.
Described technical scheme is preferably, and the channel diameter of described CT detecting device is 80cm 120cm.
Described technical scheme is preferably, and described CT detector adopts the one in single slice detector, double sandwich detector, photon counting detector.
Described technical scheme is preferably, and the visual angle number of described various visual angles detecting device is 2-4.
Described technical scheme is preferably, and described various visual angles detector adopts the one in single slice detector, double sandwich detector, photon counting detector.
The present invention provides a kind of safety detection method, at least comprises the following steps:
A: the transmission that object to be detected is positioned over operation is arranged, described object to be detected passes through CT detecting device, described first controls and data handling machine obtains the three-dimension disclocation structural information of object to be detected and density information and atomic number information, obtains the area-of-interest of object to be detected according to density information and atomic number information；
B: described object to be detected is by various visual angles detecting device, and described second control and data handling machine obtain the fluoroscopy images information at the multiple visual angle of object to be detected；In combination with the three-dimension disclocation structural information in step a, it is thus achieved that the effective atomic number information of area-of-interest；Or by atomic number modification method, atomic number information is modified, it is thus achieved that effective atomic number information；
C: described integrated data processing computer obtains the density information of object to be detected, effective atomic number information, by searching data base, decides whether to provide warning message.
The present invention also provides for a kind of safety detection method, at least comprises the following steps:
A: the transmission that object to be detected is positioned over operation is arranged, described object to be detected is by various visual angles detecting device, described second control and data handling machine obtain fluoroscopy images information and the atomic number information at the multiple visual angle of object to be detected, obtain the area-of-interest of object to be detected according to the fluoroscopy images information at the multiple visual angle of object to be detected and atomic number information；
B: described object to be detected passes through CT detecting device, the three-dimension disclocation structural information of described first control and data handling machine acquisition object to be detected and density information and atomic number information；In combination with the fluoroscopy images information in step a and atomic number information, it is thus achieved that the effective atomic number information of area-of-interest；Or by atomic number modification method, atomic number information is modified, it is thus achieved that effective atomic number information；
C: described integrated data processing computer obtains the density information of object to be detected, effective atomic number information, by searching data base, decides whether to provide warning message.
Described technical scheme is preferably, and described CT detecting device adopts monoenergetic spectrum CT detecting device, by atomic number modification method, atomic number information is modified, comprises the following steps:
1) obtain area-of-interest according to the three-dimension disclocation structural information of object to be detected, and analyze the described area-of-interest degree along each projection view angles overlapped object of ray projecting direction, obtain overlapped object extent index under each visual angle；
2), when described various visual angles detecting device obtains 2-4 perspective projection visual angle, overlapped object extent index is selected to carry out effective atomic number calculating；
Described CT detecting device adopts multi-power spectrum CT detecting device, by atomic number modification method, atomic number information is modified, comprises the following steps:
1) area-of-interest is obtained according to the three-dimension disclocation structural information of object to be detected, and analyze described area-of-interest along each projection view angles area-of-interest of ray projecting direction degree overlapping with metal object, it is thus achieved that each visual angle metal object overlapping degree parameter；
2), when described various visual angles detecting device obtains 2-4 perspective projection visual angle, metal object overlapping degree parameter is selected to carry out the calculating of effective atomic number.
Described technical scheme is preferably, the computational methods of described overlapped object extent index include: by projection gray level curve normalization, it is considered as the probability density function of positional information, calculates the mean square deviation under described probability density function, as the numerical value of overlapped object extent index；Numerical value is more big, illustrates that overlapped object degree is more low, otherwise more high；Or the area-of-interest of object to be detected is positioned, image values in described area-of-interest is set to 0, then according to the view directions of various visual angles and imaging geometry parameter carry out orthographic projection, obtain the project objects grey scale curve after removing described area-of-interest, calculate the average of data for projection of described area-of-interest correspondence projected position as overlapping degree parameter.Average is more little, illustrates that overlapped object degree is more little.
Described technical scheme is preferably, the computational methods of described metal object Overlapping parameters include: positioned by the area-of-interest of object to be detected and determine its internal metallic region by setting threshold values, image in area-of-interest and beyond metallic region is set to 0, image in metallic region is set to 1, then according to the view directions of various visual angles and imaging geometry parameter carry out orthographic projection, obtain the project objects grey scale curve after removing described area-of-interest, calculate the average of data for projection of described area-of-interest correspondence projected position as overlapping degree parameter.Average is more little, illustrates that overlapped object degree is more little.
Described technical scheme is preferably, and the density of described area-of-interest is 1.2-1.5g/cm3, atomic number is 6-8.
Compared with prior art, the superior effect of the present invention is in that: described various visual angles detecting device uses with the combination of CT detecting device, utilizes CT detecting device to obtain the three-dimension disclocation structural information of object to be detected, improves the detection accuracy of object to be detected；Adopt various visual angles detecting device to compensate for the shortcoming that CT detecting device declines for atomic number detection accuracy under high desnity metal physical environment simultaneously, while reducing equipment cost, improve the precision of whole detecting device.
Accompanying drawing explanation
Fig. 1 is safety detection device first embodiment structural representation of the present invention；
Fig. 2 be device described in Fig. 1 adopt first pass through dual intensity spectrum CT detecting device, after through the overhaul flow chart of various visual angles detecting device；
Fig. 3 is safety detection device of the present invention second example structure schematic diagram；
Fig. 4 be described in Fig. 3 device adopt first pass through various visual angles detecting device, after through dual intensity compose CT detecting device overhaul flow chart；
Fig. 5 be safety detection device adopt first pass through monoenergetic spectrum CT detecting device, after through the flow chart of various visual angles detecting device；
Fig. 6 be safety detection device adopt first pass through various visual angles detecting device, after through the flow chart of monoenergetic spectrum CT detecting device；
When Fig. 7 is CT detecting device employing monoenergetic spectrum CT detecting device, effective atomic mumber number calculating method flow chart；
Fig. 8 is that CT detecting device adopts dual intensity spectrum CT detecting device and area-of-interest when there is high desnity metal, effective atomic mumber number calculating method flow chart；
Fig. 9 is computational methods one schematic flow sheet of overlapped object extent index；
Figure 10 is computational methods two schematic flow sheet of overlapped object extent index；
Figure 11 is the computational methods schematic flow sheet of high desnity metal overlapped object extent index.
Accompanying drawing mark is as follows:
1-CT radiation source module, 2-CT frame, 3-CT detector, 4-the first detector, 5-the second detector, 6-the second radiographic source, 7-the 3rd detector, 8-trilete rays source, 9-object to be detected, 10-first controls and data handling machine, 11-the first radiographic source, 12-integrated data processing computer, 13-second controls and data handling machine, 14-the 4th detector, 15-the 4th radiographic source, 16-transmitting device.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
Embodiment 1
As shown in Figure 1, safety detection device of the present invention, all share a sense channel including CT detecting device and the various visual angles detecting device being arranged at CT detecting device side, described CT detecting device and various visual angles detecting device.Described CT detecting device and first controls and data handling machine 10 connects；The inside of various visual angles detecting device is provided with various visual angles detector and radiation source module, and described various visual angles detector and second controls and data handling machine 13 connects；Described first control and data handling machine the 10, second control and data handling machine 13 are all connected with integrated data processing computer 12, carry out data interaction.Described safety detection device also includes transmitting device 16, and described transmitting device 16 passes the sense channel of CT detecting device and the sense channel of various visual angles detecting device.Described CT detecting device includes CT radiation source module 1, CT frame 2, CT detector 3, and described CT frame 2 is in toroidal, and described CT radiation source module 1, CT detector 3 are arranged in CT frame 2.
Further, described various visual angles detector includes first detector the 4, second detector the 5, the 3rd detector the 7, the 4th detector 14, and described radiation source module includes first radiographic source the 11, second radiographic source 6, trilete rays source the 8, the 4th radiographic source 15.The present invention passes through to arrange first detector the 4, second detector the 5, the 3rd detector the 7, the 4th detector the 14, first radiographic source the 11, second radiographic source 6, trilete rays source the 8, the 4th radiographic source 15 defines a kind of CT detecting device and the four combined safety detection devices of visual angle detecting device.
Wherein, described 4th detector 14 and the 4th radiographic source 15 constitute V1 visual angle, described 3rd detector 7 and trilete rays source 8 constitute V2 visual angle, and described second detector 5 and the second radiographic source 6 constitute V3 visual angle, and described first detector 4 and the first radiographic source 11 constitute V4 visual angle.
Safety detection device of the present invention, in use, be first placed on transmitting device 16 by object to be detected 9, starts safety detection device, and described transmitting device 16 is at the uniform velocity advanced to the right, is transported in sense channel by object to be detected 9；When object to be detected 9 arrives CT detecting device, CT frame 2 uniform rotation；Object to be detected 9 triggers CT radiation source module 1, and described CT radiation source module 1 sends X-ray beam transmission object to be detected 9, and described CT detector 3 receives the deamplification transmitted through object to be detected 9 of correspondence；CT frame 2 constantly rotates, and object to be detected 9 moves along with transmitting device 16 synchronous uniform velocity；Meanwhile, described CT detector 3 persistently receives the different angles X-ray beam deamplification data transmitted through object to be detected 9, and the data incoming first received are controlled and in data handling machine 10, described first control and data handling machine 10 carry out the CT of each layer data and rebuild and data process.
When object to be detected 9 leaves CT detecting device, after entering various visual angles detecting device, object to be detected 9 triggers first radiographic source the 11, second radiographic source 6, trilete rays source the 8, the 4th radiographic source 15 successively, and each radiographic source above-mentioned sends X-ray beam, transmission object to be detected 9 successively；Described first detector the 4, second detector the 5, the 3rd detector the 7, the 4th detector 14 receives the deamplification transmitted through object to be detected 9 of correspondence respectively, and by deamplification transmission to the second control and data handling machine 13, form the projection image signal at corresponding V4 visual angle, V3 visual angle, V2 visual angle, V1 visual angle.
Described first control and data handling machine 10, second control and in the data handling machine 13 incoming integrated data processing computer 12 of signal by reception, the data through integrated data processing computer 12 process, and draw final testing result.
Further, the side launching X ray at described first radiographic source the 11, second radiographic source 6, trilete rays source the 8, the 4th radiographic source 15 arranges collimator (not shown), and X ray becomes thin fan-ray beam after collimator.Described collimator is prior art.
Be illustrated in figure 2 safety detection device of the present invention adopt first pass through dual intensity spectrum CT detecting device, after through the overhaul flow chart of various visual angles detecting device.S11 completes the collection of CT data, and S12 carries out data reconstruction, it is thus achieved that the fault structure information of object to be detected 9, tomography electron density information and tomography effective atomic number information；Each tomography CT image is carried out region segmentation by S13, obtains the connected region that in tomography, each is independent；In S14, analyze electron density and the effective atomic number in each independent communication region, inquire about data base, primarily determine that out three dimensional area of interest；S15 carries out the data acquisition of various visual angles detecting device, in S16, the image information obtained in S15 is split, obtains two-dimensional regions of interest, in conjunction with the CT fault information in S14；In S17, three dimensional area of interest is carried out effective atomic number correction, it is thus achieved that the revised effective atomic number information of each three dimensional area of interest；Last connected region in S18 to each three dimensional area of interest, utilize the revised effective atomic number information obtained in the electron density information obtained in S14 and S17, testing result is provided by inquiring about data base, and testing result be shown on described integrated data processing computer 12, and decide whether to report to the police.
Embodiment 2
As shown in Figure 3, safety detection device of the present invention provides another embodiment, is distinctive in that with embodiment 1, is positioned on transmitting device 16 by object to be detected 9, described transmitting device 16 is advanced to the left, described object to be detected 16 first pass through various visual angles detecting device, after through CT detecting device.Fig. 4 show safety detection device workflow diagram shown in Fig. 3.Described CT detecting device adopts dual intensity spectrum CT detecting device, and idiographic flow includes: complete multi-view X ray data acquisition in S21；S22 completes image segmentation the effective atomic number information according to each cut zone, inquires about data base, primarily determine that each two-dimensional regions of interest；S23 completes CT data acquisition, the CT data gathered is carried out three-dimensional reconstruction by S24, it is thus achieved that each CT fault structure information, tomography electron density information and tomography effective atomic number information；According to the two-dimensional regions of interest in S22 in S25, each tomography CT image information is carried out region segmentation, obtain the three-dimensional sense interest connected region corresponding with various visual angles two-dimensional regions of interest；With reference to the two-dimensional regions of interest information of S22 in S26, three dimensional area of interest is carried out effective atomic number correction, it is thus achieved that the revised effective atomic number information of each three dimensional area of interest；Finally to each three dimensional area of interest in S27, according to the revised effective atomic number information that the S24 electron density information obtained and S26 obtain, testing result is provided by inquiring about data base, and testing result be shown on described integrated data processing computer 12, and decide whether to report to the police.
Embodiment 3
As shown in Figure 5, safety detection device of the present invention also provides for another embodiment, the present embodiment is distinguished by with embodiment 1, described CT detecting device adopts monoenergetic spectrum CT detecting device, the safety detection device of the present embodiment adopt first pass through monoenergetic spectrum CT detecting device, after through the detection method of various visual angles detecting device；Specifically include: S31 completes the collection of CT data, S32 carries out CT three-dimensional reconstruction, obtain fault structure information, tomography electron density information, each tomography CT image is carried out region segmentation by S33, obtain the connected region that in tomography, each is independent, S34, with reference to electron density information, primarily determines that three dimensional area of interest by inquiring about data base；S35 completes multi-view X ray image information collecting by various visual angles detecting device；Image in above-mentioned S35 is carried out segmentation by S36 and obtains corresponding two-dimensional regions of interest, simultaneously, in conjunction with the CT fault information in S34, finally in S37, three dimensional area of interest is carried out effective atomic number calculating, it is thus achieved that each three dimensional area of interest effective atomic number information；To each three-dimensional sense interest connected region in S38, and utilize the effective atomic number information obtained in the electron density information obtained in S34 and S37, by inquiring about data base, provide testing result, and testing result be shown on described integrated data processing computer 12, and decide whether to report to the police.
Embodiment 4
As shown in Figure 6, safety detection device of the present invention also provides for another embodiment, the present embodiment is distinguished by with embodiment 2, described CT detecting device adopts monoenergetic spectrum CT detecting device, the safety detection device of the present embodiment adopt first pass through various visual angles detecting device, after through the detection method of monoenergetic spectrum CT detecting device；Specifically include: object to be detected 9 is carried out image data acquiring by S41 various visual angles detecting device, the image information gathered is split by S42, and the effective atomic number information according to each cut zone, inquiry data base, primarily determine that each two-dimensional regions of interest, object to be detected 9 is carried out data acquisition by S43, S44 obtains the CT fault structure information of object to be detected 9, tomography electron density information, S45 is according to the two-dimensional regions of interest determined in S42, each tomography CT image is carried out region segmentation, obtain each three-dimensional sense interest connected region corresponding with various visual angles two-dimensional regions of interest, then in conjunction with the result of S42 in S46, three dimensional area of interest is carried out effective atomic number calculating, obtain the effective atomic number information of each three dimensional area of interest；In S47, to each three-dimensional sense interest connected region, utilize the effective atomic number information that the S44 electron density information obtained and S46 obtain, inquiry data base, provide testing result, and testing result is shown on described integrated data processing computer 12, and decide whether to report to the police.
Safety detection device accompanying drawing 7,8 of the present invention gives the computational methods of effective atomic number, further, in Fig. 7, described CT detecting device adopts monoenergetic spectrum CT detecting device, by atomic number modification method, atomic number information is modified, three-dimension disclocation structural information according to object to be detected obtains area-of-interest, and analyzes the described area-of-interest degree along each projection view angles overlapped object of ray projecting direction, obtains overlapped object extent index under each visual angle；When described various visual angles detecting device obtains 2-4 perspective projection visual angle, the visual angle selecting overlapped object extent index minimum carries out effective atomic number calculating.In fig. 8, described CT detecting device adopts multi-power spectrum CT detecting device, by atomic number modification method, atomic number information is modified, three-dimension disclocation structural information according to object to be detected obtains area-of-interest, and analyze described area-of-interest along each projection view angles area-of-interest of ray projecting direction degree overlapping with metal object, it is thus achieved that each visual angle metal object overlapping degree parameter；When described various visual angles detecting device obtains 2-4 perspective projection visual angle, the visual angle selecting metal object overlapping degree parameter minimum carries out the calculating of effective atomic number.
The computational methods of overlapped object extent index are given as shown in accompanying drawing 9,10,11, further, in Fig. 9, the computational methods of described overlapped object extent index, including by projection gray level curve normalization, it is considered as the probability density function of positional information, calculates the mean square deviation under described probability density function, as the numerical value of overlapped object extent index；Numerical value is more big, illustrates that overlapped object degree is more low, otherwise more high.Figure 10 gives another computational methods of overlapped object extent index, the area-of-interest of object to be detected is positioned, image values in described area-of-interest is set to 0, then according to the view directions of various visual angles and imaging geometry parameter carry out orthographic projection, obtain the project objects grey scale curve after removing described area-of-interest, calculate the average of data for projection of described area-of-interest correspondence projected position as overlapping degree parameter.Average is more little, illustrates that overlapped object degree is more little.The computational methods giving described metal object Overlapping parameters in Figure 11 include: positioned by the area-of-interest of object to be detected and determine its internal metallic region by setting threshold values, image in area-of-interest and beyond metallic region is set to 0, image in metallic region is set to 1, then according to the view directions of various visual angles and imaging geometry parameter carry out orthographic projection, obtain the project objects grey scale curve after removing described area-of-interest, calculate the average of data for projection of described area-of-interest correspondence projected position as overlapping degree parameter.Average is more little, illustrates that overlapped object degree is more little.
Various visual angles detector of the present invention and radiation source module are prior art, for common detector and radiation source module, and the quantity of various visual angles detector and radiation source module is combined according to the actual requirements, CT detecting device and the three combined safety detection devices of visual angle detecting device, CT detecting device and the combined safety detection device of Double-visual angle detecting device can be formed.It addition, described CT detecting device, various visual angles detecting device, the first control and data handling machine 10, the 12, second control of integrated data processing computer and data handling machine 13 are also prior art, operator select according to practical situation.
The present invention is not limited to above-mentioned embodiment, and when without departing substantially from the flesh and blood of the present invention, any deformation that it may occur to persons skilled in the art that, improvement, replacement each fall within the scope of the present invention.
Claims (10)
1. a safety detection device, it is characterised in that include CT detecting device and be arranged at the various visual angles detecting device of CT detecting device side, described CT detecting device and various visual angles detecting device share a sense channel；
Described CT detecting device and first controls and data handling machine connects；The inside of various visual angles detecting device is provided with various visual angles detector and radiation source module, and described various visual angles detector and second controls and data handling machine connects；Described first control and data handling machine, the second control and data handling machine are all connected with integrated data processing computer；
Described safety detection device also includes transmitting device, and described transmitting device passes the sense channel of CT detecting device and the sense channel of various visual angles detecting device.
2. safety detection device according to claim 1, it is characterised in that described CT detecting device includes CT radiation source module, CT frame, CT detector, and described CT radiation source module and CT detector may be contained within CT frame；Described CT detector adopts the one in single slice detector, double sandwich detector, photon counting detector.
3. safety detection device according to claim 1 and 2, it is characterised in that described CT detecting device adopts the one in monoenergetic spectrum CT detecting device, multi-power spectrum CT detecting device；And the channel diameter of CT detecting device is 80cm 120cm.
4. safety detection device according to claim 1, it is characterised in that the visual angle number of described various visual angles detecting device is 2-4.
5. safety detection device according to claim 1, it is characterised in that described various visual angles detector adopts the one in single slice detector, double sandwich detector, photon counting detector.
6. one kind based on the safety detection method of safety detection device in claim 1, it is characterised in that at least comprise the following steps:
A: the transmission that object to be detected is positioned over operation is arranged, described object to be detected passes through CT detecting device, described first controls and data handling machine obtains the three-dimension disclocation structural information of object to be detected and density information and atomic number information, obtains the area-of-interest of object to be detected according to density information and atomic number information；
B: described object to be detected is by various visual angles detecting device, and described second control and data handling machine obtain the fluoroscopy images information at the multiple visual angle of object to be detected；In combination with the three-dimension disclocation structural information in step a, it is thus achieved that the effective atomic number information of area-of-interest；Or by atomic number modification method, atomic number information is modified, it is thus achieved that effective atomic number information；
C: described integrated data processing computer obtains the density information of object to be detected, effective atomic number information, by searching data base, decides whether to provide warning message.
7. one kind based on the safety detection method of safety detection device in claim 1, it is characterised in that at least comprise the following steps:
A: the transmission that object to be detected is positioned over operation is arranged, described object to be detected is by various visual angles detecting device, described second control and data handling machine obtain fluoroscopy images information and the atomic number information at the multiple visual angle of object to be detected, obtain the area-of-interest of object to be detected according to the fluoroscopy images information at the multiple visual angle of object to be detected and atomic number information；
B: described object to be detected passes through CT detecting device, the three-dimension disclocation structural information of described first control and data handling machine acquisition object to be detected and density information and atomic number information；In combination with the fluoroscopy images information in step a and atomic number information, it is thus achieved that the effective atomic number information of area-of-interest；Or by atomic number modification method, atomic number information is modified, it is thus achieved that effective atomic number information；
C: described integrated data processing computer obtains the density information of object to be detected, effective atomic number information, by searching data base, decides whether to provide warning message.
8. the safety detection method according to claim 6 or 7, it is characterised in that
Described CT detecting device adopts monoenergetic spectrum CT detecting device, by atomic number modification method, atomic number information is modified, comprises the following steps:
1) obtain area-of-interest according to the three-dimension disclocation structural information of object to be detected, and analyze the described area-of-interest degree along each projection view angles overlapped object of ray projecting direction, obtain overlapped object extent index under each visual angle；
2), when described various visual angles detecting device obtains 2-4 perspective projection visual angle, overlapped object extent index is selected to carry out effective atomic number calculating；
Described CT detecting device adopts multi-power spectrum CT detecting device, by atomic number modification method, atomic number information is modified, comprises the following steps:
1) area-of-interest is obtained according to the three-dimension disclocation structural information of object to be detected, and analyze described area-of-interest along each projection view angles area-of-interest of ray projecting direction degree overlapping with metal object, it is thus achieved that each visual angle metal object overlapping degree parameter；
2), when described various visual angles detecting device obtains 2-4 perspective projection visual angle, metal object overlapping degree parameter is selected to carry out the calculating of effective atomic number.
9. safety detection method according to claim 8, it is characterized in that, the computational methods of described overlapped object extent index include: by projection gray level curve normalization, it is considered as the probability density function of positional information, calculate the mean square deviation under described probability density function, as the numerical value of overlapped object extent index；Or the area-of-interest of object to be detected is positioned, image values in described area-of-interest is set to 0, then according to the view directions of various visual angles and imaging geometry parameter carry out orthographic projection, obtain the project objects grey scale curve after removing described area-of-interest, calculate the average of data for projection of described area-of-interest correspondence projected position as overlapping degree parameter.
10. safety detection method according to claim 8, it is characterized in that, the computational methods of described metal object Overlapping parameters include: positioned by the area-of-interest of object to be detected and determine its internal metallic region by setting threshold values, image in area-of-interest and beyond metallic region is set to 0, image in metallic region is set to 1, then according to the view directions of various visual angles and imaging geometry parameter carry out orthographic projection, obtain the project objects grey scale curve after removing described area-of-interest, calculate the average of data for projection of described area-of-interest correspondence projected position as overlapping degree parameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510100213.6A CN105759318B (en) | 2015-03-06 | 2015-03-06 | Safety detection device and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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