CN109343135A - A kind of multilevel energy type static state safety check CT system and imaging method - Google Patents
A kind of multilevel energy type static state safety check CT system and imaging method Download PDFInfo
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- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
- G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
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Abstract
The invention discloses a kind of multilevel energy type static state safety check CT system and imaging methods.The static state safety check CT system includes N grades of image chain structures of at least one set, is provided with luggage carousel on the inside of N grades of Image chain structural bases, N grades of image chain structures and luggage carousel are fixed on the predeterminated position of static safety check CT system by rack；N grades of image chain structures of each group, which are expert in the direction of advance of Li Tongdao, successively sequentially arranges, also, staggered arrangement between N grades of image chain structures of adjacent sets.This static state safety check CT system produces the image for having more high time resolution, more multi-power spectrum rank than spiral CT, the discrimination and baggage check speed of the contraband in luggage can be improved by the exposure of timing radiographic sources different in N grades of image chain structures.On the other hand, this static state safety check CT system, which is got rid of, relies on slip ring, and multifocal x-ray source and detector do not need to rotate, and realize quiescent imaging without spin.
Description
Technical field
The present invention relates to a kind of multilevel energy type static state safety check CT system (hereinafter referred to as static safety check CT systems), while
It is related to the imaging method of the multilevel energy type static state safety check CT system, belongs to radiography field.
Background technique
With further increasing both at home and abroad to safety check technology acuracy requirement, in important places such as civil aviaton, customs, tradition is thoroughly
Have the tendency that gradually being replaced by CT equipment depending on rays safety detection apparatus；Also, while requiring to improve to safety check technology acuracy, detection speed
Higher requirements are also raised for degree.
Existing safety check CT equipment is divided into two classes, and one kind is the helical CT device based on slip ring.The helical CT device
In, radiographic source and detector need to rotate around testee, and safety check CT maximum speed can reach 4 circle per second left and right, rotation at present
Each component needs to bear huge centrifugal force during turning, and more stringent requirements are proposed for this design to critical component, especially right
For the safety check CT of large aperture, since the field angle of scanning is bigger, the distance of rotation center to critical component can be bigger, on an equal basis
Under revolving speed, the centrifugal force that critical component needs to bear will be bigger.Meanwhile after helical CT device rotation speed improves, entirely
The reliability of helical CT device, safety, stability and service life will receive a degree of influence.Therefore, rotation speed reaches
To certain degree, just it is difficult to be further continued for improving, and in practical application, safety check is higher and higher to the requirement for checking speed.In addition,
It will use slip ring in spiral safety check CT generally to be powered and data, the transmission for controlling signal, be used in slip ring system count
The carbon brush service life according to transmission and power supply is shorter, this makes, and maintenance cost increases and maintenance cycle shortens；Also, drive radiographic source
It is bad that user experience is also brought along with the noise of the transmission device of detector rotation.
Another kind of is static CT equipment.The static state CT equipment does not have slip ring, radiographic source and detector without opposite detected material
The rotary motion of body.Also, static CT equipment has compared to helical CT device checks that speed is fast, maintenance cost is low, reliability
The features such as high, is paid attention to by field of safety check in recent years.But existing static state CT technology is also difficult to take into account dual-energy imaging, imaging
A variety of requirements such as quality, scatter suppression, however it remains clearly disadvantageous.
Summary of the invention
Primary technical problem to be solved by this invention is to provide a kind of multilevel energy type static state safety check CT system.
Another technical problem to be solved by this invention be to provide a kind of multilevel energy type static state safety check CT system at
Image space method.
To achieve the goals above, the present invention uses following technical solutions:
According to a first aspect of the embodiments of the present invention, a kind of multilevel energy type static state safety check CT system is provided, including at least
One group of N grades of image chain structure is provided with luggage carousel, the N grades of image link on the inside of the N grades of Image chain structural base
Structure and the luggage carousel are fixed on the predeterminated position of the static safety check CT system by rack, and wherein N is positive integer；
N described in each group grades of image chain structure, which is expert in the direction of advance of Li Tongdao, successively sequentially arranges, also, adjacent sets institute
State staggered arrangement between N grades of image chain structures.
Wherein more preferably, N described in every group grades of image chain structure is made of N number of single-stage image chain element；
Each single-stage image chain element in N described in every group grades of image chain structure be expert in the direction of advance of Li Tongdao according to
Secondary sequence arrangement, also, staggered arrangement between the adjacent single-stage image chain element.
Wherein more preferably, each single-stage image chain element includes multifocal x-ray source and detector assembly；Its
In, multifocal x-ray source is formed by multiple focuses, is that equidistant straight line is arranged, angularly between adjacent focal spots
Circular arc type arrangement or angularly curvilinear style arrangement in any one.
Wherein more preferably, for the same single-stage image chain element, multifocal x-ray source is formed by more
In focus, the line of two focuses on the outermost side to virtual rotation center is respectively with centrally located focus to virtually
Angle is formed by between the line of rotation center no more than 5 °, also, two focuses on the outermost side are into virtual rotation
The line of the heart is formed by angle no more than 10 °.
Wherein more preferably, multifocal x-ray source is formed by multiple focuses, ray corresponding with each focus
The edge in the fan angle covering luggage channel of Shu Zhangkai；Also, the multifocal x-ray source of each single-stage image chain element
Not less than 180 °+max of the equivalent rotary angle formed with the detector assembly (theta1, theta2, theta3 ...,
ThetaM), wherein max (theta1, theta2, theta3 ..., thetaM) for multifocal x-ray source institute shape
At the fan angle opened of the corresponding beam of multiple focuses in choose maximum fan angle.
Wherein more preferably, it is additionally provided in the multilevel energy type static state safety check CT system for controlling each single-stage shadow
The grid-control switch emitted as each ray tube or radiographic source transmitting/stopping of chain element.
Wherein more preferably, the detector assembly includes arc-shaped detector carriage and multiple detectors, multiple spies
It surveys device to be arranged in using the center in luggage channel as in the circular arc detector carriage in the center of circle, and multiple detector faces
The middle position of multiple focuses in multifocal x-ray source.
Wherein more preferably, the detector is any in single energy detector, dual intensity sandwich detectors, photon counting detector
One or more combinations.
Wherein more preferably, when the detector is the single row detector, the single row detector and the multifocal X
The focus of light emission line source is total to X/Y plane, and multiple focuses in multifocal x-ray source described in the single row detector face
Middle position；
When the detector is the multi-detector, intermediate row detector in the multi-detector and described more
Multiple focuses of focus X-ray light emission line source are total to X/Y plane, and multifocal x-ray source described in the multi-detector face is more
The middle position of a focus.
According to a second aspect of the embodiments of the present invention, a kind of imaging method is provided, it is static by above-mentioned multilevel energy type
Safety check CT system is realized, is included the following steps:
Luggage or package enter luggage channel, and according to default timing, the multifocal X-ray for controlling each single-stage image chain element is penetrated
Focus in line source successively exposes, and acquires luggage or package by each single-stage image chain element by corresponding detector assembly
When data for projection；
When the luggage or package reach the last one single-stage image chain element of every group of N grades of image chain structures, from row
First faultage image of Lee or package starts, and successively each faultage image is rebuild and identified；
After the last one single-stage image chain element of N grades of image chain structures described in leaving every group when luggage or package, complete
The acquisition of data for projection, and continue that successively remaining faultage image is rebuild and identified；
After the reconstruction and identification of completing each faultage image of the entire luggage or package, warning message is provided, with
Complete the complete detection of the luggage or package.
Multilevel energy type static state safety check CT system provided by the present invention, on the one hand using multiple by multifocal x-ray
The single-stage image chain element in source and detector assembly composition, constitutes N grades of image chain structures.By different in N grades of image chain structures
The exposure of timing radiographic source produces the image for having more high time resolution, more multi-power spectrum rank than spiral CT, improves luggage
In contraband discrimination and baggage check speed.On the other hand, this static state safety check CT system, which is got rid of, relies on slip ring, and
And multifocal x-ray source and detector do not need to rotate, and realize quiescent imaging without spin.Simultaneously because this static state safety check CT system
No rotary part of uniting to reduce the maintenance cost and noise of equipment improves the stability of equipment.
Detailed description of the invention
Fig. 1 is the sectional view of static safety check CT system provided by the present invention；
Fig. 2 is the internal structure chart of static safety check CT system provided by the present invention；
Fig. 3 is the structure chart of N grades of image chain structures in static safety check CT system provided by the present invention；
Fig. 4 is the light path schematic diagram of adjacent single-stage image chain element in static safety check CT system provided by the present invention；
Fig. 5 is the light path schematic diagram of single-stage image chain element in static safety check CT system provided by the present invention；
Fig. 6 is the structure chart of single row detector in static safety check CT system provided by the present invention；
Fig. 7 is the structure chart of multi-detector in static safety check CT system provided by the present invention；
Fig. 8 is the imaging method flow chart of static safety check CT system provided by the present invention.
Specific embodiment
Technology contents of the invention are described in further detail in the following with reference to the drawings and specific embodiments.
As depicted in figs. 1 and 2, multilevel energy type static state safety check CT system provided by the present invention includes sequentially connected outer
Shell 1, mouth of stocking up shielding curtain 2 and output port shield curtain 7, at least one set of N grades of image chain structure 5 are internally provided in shell 1, in N
Luggage carousel 4 is provided on the inside of 5 bottom of grade image chain structure, N grades of image chain structures 5 and luggage carousel 4 pass through rack 8
It is fixed on the predeterminated position of this static state safety check CT system, in order to which tested luggage or package 3 are transported to N by luggage carousel 4
Grade image chain structure 5, the acquisition of data for projection is completed by N grades of image chain structures 5, and data for projection collected is transmitted to
Computer generates the tested luggage or wraps up 3 three-dimensional tomographic image.
Wherein, every group of N grades of image chain structures 5 are made of N number of single-stage image chain element, the range of N preferably 10~30.Example
Such as, it is assumed that in this static state safety check CT system, every group of N grades of image chain structures 5 are 5 grades be made of 5 single-stage image chain elements
Image chain structure, as shown in figure 3,5 grades of image chain structures respectively include single-stage image chain element 5-1, single-stage image chain element
5-2, single-stage image chain element 5-3, single-stage image chain element 5-4 and single-stage image chain element 5-5.
As shown in figure 4, multiple scanning viewing angle requirements in order to realize different luggage or package, every group of N grades of image chain structures 5
In each single-stage image chain element successively sequence of being expert in the direction of advance of Li Tongdao arrange, also, adjacent single-stage Image chain list
It can be laid out between member with identical or different angular misalignment, i.e., need the certain angle that is staggered between adjacent single-stage image chain element
θ (offset angular θ between such as single-stage image chain element 5-1 and single-stage image chain element 5-2).For example, every group of N grades of image chain structures
In 5, first single-stage image chain element is arranged in 0 ° of position, and second single-stage image chain element is relative to first single-stage image
Chain element circumferentially offsets angle, θ, and third single-stage image chain element is relative to second single-stage image chain element along circle
Circumferential direction offset angular θ, and so on go down ....Wherein, the angle, θ being staggered between adjacent single-stage image chain element and every group
The selection of the quantity of the single-stage image chain element of N grades of image chain structures needs to be adjusted according to actual imaging demand.For example, according to every
The drop shadow spread around object rotation of each formed certain angle of single-stage image chain element of N grades of image chain structures 5 of group (encloses
The angle rotated around object), adjust the angle, θ that is staggered between adjacent single-stage image chain element in every group of N grades of image chain structures and
The quantity of single-stage image chain element.
Equally, in order to realize different luggage or package multiple imaging angles demand, N grades of image chain structures 5 of each group exist
Successively sequence is arranged in the direction of advance in luggage channel, also, can be with identical or not between N grades of image chain structures 5 of adjacent sets
Same angular misalignment is laid out, i.e. needs the certain angle that is staggered between adjacent sets N grades of image chain structures 5.Wherein, adjacent sets N grades of shadows
As the selection of the group number for angle and N grade image chain structure being staggered between chain structure 5 needs to be adjusted according to actual imaging demand.
As shown in figure 5, each single-stage image chain element includes multifocal x-ray source 9 and detector assembly 10.Multifocal
X-ray source 9 can be packaged into a whole radiographic source by M ray tube, and the range of M preferably 2~24；Multifocal X-ray is penetrated
Line source 9 can also be assembled into a component by multiple small radiographic sources.Wherein, multifocal x-ray source 9 is formed by multiple focuses
In, it can arrange, can also arrange at angularly circular arc type or curvilinear style at equidistant straight line between adjacent focal spots.
Specifically, since there are one in X/Y plane between each single-stage image chain element of every group of N grades of image chain structures 5
A virtual rotation center, the coordinate of the virtual rotation center in X/Y plane be (0,0), each single-stage image chain element it is virtual
Rotation center coordinate is identical, that is, shares rotation center.It is every group N grades that virtual coordinate of the rotation center in X/Y plane, which is (0,0),
The central coordinate of circle for the arcuate structure that each single-stage image chain element of image chain structure 5 is enclosed.Wherein, such as Fig. 1 and Fig. 2 institute
Show, X/Y plane is referred to using the direction parallel with 4 width direction of luggage carousel as X-axis, perpendicular to luggage carousel 4
Surface upwardly direction is as Y-axis, using 4 length direction of luggage carousel as Z axis；It is as X-axis and plane composed by Y-axis
X/Y plane.
Visual field in order to guarantee this static state safety check CT system is sufficiently large (FOV is sufficiently large), so that each single-stage image
Multiple focuses in the multifocal x-ray source 9 of chain element can share the same detector assembly, and also guarantee that this static state is pacified
When examining CT system realization dual-energy imaging, the pixel energy of dual intensity sandwich detectors is just aligned, high- and low-energy detector as hereinafter described
The pixel of low energy detector and the pixel of high energy detector just align so that the imaging data of each pixel of low energy detector with
The imaging data of each pixel of high energy detector corresponds, for the same single-stage image chain element, multifocal x-ray source 9
Be formed by multifocal, the line of two focuses on the outermost side to virtual rotation center respectively with it is centrally located
Focus is not more than 5 ° to angle is formed by between the line of virtual rotation center, also, two focuses on the outermost side arrive
The line of virtual rotation center is formed by angle no more than 10 °.
Multifocal x-ray source 9 is formed by multiple focuses, due to the corresponding ray tube of different focal point or radiographic source
The position of (small radiographic source) is different, therefore the fan angle that the corresponding beam of different focal point opens may be different, can respectively correspond
Indicate theta1, theta2, theta3 ... ... thetaM.Wherein, the fan angle covering that beam corresponding with each focus opens
The edge in luggage channel, to guarantee the X-ray beam energy of ray tube corresponding with each focus or radiographic source (small radiographic source) transmitting
Tested luggage or package is enough completely covered.In addition, in every group of N grades of image chain structures 5, the multifocal X of each single-stage image chain element
Light emission line source 9 and detector assembly 10 form the drop shadow spread around object rotation of certain angle, in order to guarantee as multifocal X
9 emission beam of light emission line source, corresponding detector assembly will receive the equivalent data for projection rotated around object, each single-stage shadow
As the equivalent rotary angle that the multifocal x-ray source 9 of chain element and detector assembly 10 are formed is not less than 180 ° of+max
(theta1, theta2, theta3 ..., thetaM), so that multifocal x-ray source 9 and detector assembly were formed etc.
Effect rotation angle meets the data area of half scan；Max (theta1, theta2, theta3 ..., thetaM) be with it is multifocal
Point x-ray source 9 is formed by the fan angle that the corresponding beam of multiple focuses opens and chooses maximum fan angle.
It is additionally provided in this static state safety check CT system for controlling single-stage Image chain list in every group of N grades of image chain structures 5
Each ray tube of member or the grid-control switch of radiographic source (small radiographic source) rapid fire/stopping emitting x-ray.According to this static state
In the speed of service of the luggage carousel 4 of safety check CT system, every group of N grades of image chain structures 5 number of rows of each detector assembly and its
Response time controls exposure sequencing and the exposure agent of the different focal point (such as focus 9-1~9-3) in multifocal x-ray source 9
The size of amount.
As shown in figure 5, detector assembly 10 includes arc-shaped detector carriage 13 and multiple detectors 11, multiple detectors
11 are arranged in using the center in registered luggage channel as in the circular arc detector carriage 13 in the center of circle (center of circle 12), and multiple detectors
The middle position of multiple focuses in face multifocal x-ray source.Multiple detectors (detector 11-1 and detector 11-N) it
Between be formed by multifocal x-ray scanning region and should be large enough to covering entirely tested luggage channel 15.
Wherein, in detector assembly 10, detector 11 can be single energy detector, dual intensity sandwich detectors, photon counting
The combination of any one or more in detector.For example, it is assumed that detector is using dual intensity sandwich detectors, the dual intensity interlayer
Detector is high- and low-energy detector；As shown in fig. 6, each high- and low-energy detector by be located at upper layer low energy detector 111 and position
It is formed in the high energy detector 112 of lower layer；When tested luggage or package 3 pass sequentially through certain by luggage carousel 4 from mouth is stocked up
When each single-stage image chain element of one group of N grades of image chain structure, each single-stage image chain element can be from multiple focal spot x-ray source
Fan-shaped x-ray beam is chronologically issued in 9, the high- and low-energy detector of the detector assembly 10 of corresponding each single-stage image chain element is just
The X-ray beam after decaying by cargo can be received, low energy and high energy X spectrum are contained in the X-ray beam, in detector assembly 10
Low energy and high energy detector receive corresponding X-ray signal data respectively, and transmit that data to background computer, each
Tested luggage or package can all obtain being given birth to from N grades of image chain structure data collected by certain algorithm process
At the three-dimensional tomographic image of the luggage or package.
According to the demand of areas imaging, the detector in detector assembly 10 can be single row or multiple rows detector.Such as Fig. 6
It is shown, when areas imaging is smaller, single row detector can be chosen, at this point, the single row detector and multifocal x-ray source
Focus is total to X/Y plane, and the middle position of multiple focuses in single row detector face multifocal x-ray source.As shown in fig. 7,
When areas imaging is larger, multi-detector part can be chosen, at this point, intermediate row detector in the multi-detector and multifocal
Multiple focuses in point x-ray source are total to X/Y plane, and in multiple focuses in multi-detector face multifocal x-ray source
Between position.
As shown in Fig. 2, this static state safety check CT system further includes high pressure generator 6, for giving each multifocal x-ray source
High pressure is provided.When the detector in detector assembly 10 is using single energy detector, due to the work in each multifocal x-ray source
It can be different voltage, the high pressure that control high pressure generator 6 emits, so that each multifocal x-ray source is in as voltage
Different operating voltages, so may be implemented this static state safety check CT system complete dual-energy imaging, three can be imaged or multipotency be imaged.It removes
Except this, detector can also be realized that this static state safety check CT system completes dual-energy imaging using dual intensity sandwich detectors, for example,
Same voltage value is used using high- and low-energy detector, realizes that this static state safety check CT system completes dual-energy imaging；Alternatively, by detector
Component realizes that this static state safety check CT system completes multipotency imaging using photon counting detector.
The structure of multilevel energy type static state safety check CT system provided by the present invention described in detail above, says in detail below
The imaging method of bright multilevel energy type static state safety check CT system provided by the present invention.
As shown in figure 8, the imaging method of multilevel energy type static state safety check CT system provided by the present invention, including walk as follows
It is rapid:
Step S1: luggage or package enter luggage channel and control the multifocal of each single-stage image chain element according to default timing
Focus in point x-ray source successively exposes, and acquires package by corresponding detector assembly and pass through each single-stage Image chain list
Data for projection when first.
When luggage or package pass sequentially through each of a certain group of N grades of image chain structures by luggage carousel 4 from mouth is stocked up
When single-stage image chain element, according to the speed of service of the luggage carousel 4 of this static state safety check CT system, every group of N grades of images link
The number of rows of each detector assembly and its response time in structure 5, by each in every group of N grades of image chain structures 5 of grid-control switch control
The size of the exposure sequencing and exposure dose of focus in the multifocal x-ray source of single-stage image chain element.
Since only one each ray tube of the multifocal x-ray source of each single-stage image chain element or radiographic source can be sent out
Beam is penetrated, therefore, according to the exposure sequencing of the focus in the multifocal x-ray source of each single-stage image chain element, is led to
Crossing grid-control switch can be with the ray tube or radiographic source in the multifocal x-ray source of each single-stage image chain element of a secondary control
Emission beam simultaneously.In this way, can control by grid-control switch in the multifocal x-ray source of each single-stage image chain element
Focus successively exposes, and projects to corresponding spy after the focus-exposure in the multifocal x-ray source of each single-stage image chain element
It surveys in device assembly, to acquire the projection of luggage or package by each single-stage image chain element when by corresponding detector assembly
Data.The data for projection of the detector assembly acquisition of each single-stage image chain element can be transferred to background computer.
Step S2: when luggage or package reach the last one single-stage image chain element of every group of N grades of image chain structures, from
First faultage image of luggage or package starts, and successively each faultage image is rebuild and identified.
Since the three-dimensional tomographic image of a luggage or package is made of multiple faultage images, also, each luggage or packet
In the three-dimensional tomographic image wrapped up in, each faultage image is by luggage or the corresponding position of fault of package successively by currently N grades of shadows of group
As chain structure all single-stage image chain elements after, by the data for projection of each single-stage image chain element position of fault collected
It is rebuild, the faultage image corresponding with the position of fault of formation.
When luggage or package reach the last one single-stage image chain element of every group of N grades of image chain structures, current N grades of group
The acquisition to luggage or the data for projection for wrapping up head position of fault is completed in each single-stage image chain element of image chain structure, because
This, can realize to luggage according to data for projection collected or wrap up corresponding first faultage image of head position of fault
It rebuilds, and passes through the preassembled recognizer of computer (for example, existing common image recognition program of safety check CT), and root
According to the attenuation coefficient of the first faultage image, electron density, equivalent atom ordinal number, the first faultage image rebuild is known
Not, whether to judge in the faultage image with the presence of prohibited items.With the traveling of luggage or package, luggage or package it is multiple
Position of fault passes sequentially through the last one single-stage image chain element of every group of N grades of image chain structures, at this point, using the first tomograph
The reconstruction and recognition methods of picture are successively successively rebuild and are identified to other faultage images of luggage or package.
It is emphasized that background computer can be using analytic reconstruction algorithm or iterative reconstruction algorithm to luggage or package
Each faultage image rebuild；Background computer can also be using parsing and iterative mixing algorithm for reconstructing to luggage or packet
Each faultage image wrapped up in is rebuild.Wherein, when the number of the single-stage image chain element of every group of N grades of image chain structures and often
When the product of the focus number of the multifocal radiographic source of a single-stage image chain element is larger, when being greater than 720 such as the product, it is preferred to use
Analytic reconstruction algorithm rebuilds each of luggage or package faultage image；Realization process about analytic reconstruction algorithm can
(to be published in referring to the paper of Li Baolei et al. " the Optimized Iterative method of X-ray dual intensity computerized tomography Projective decomposition "
" Acta Optica ", 2017,10:365-374), paper " the A three-dimensional- of Xiangyang Tang et al.
weighted cone beam filtered backprojection(CB-FBP)algorithm for image
Reconstruction in volumetric CT-helical scanning " it (is published in " Phys Med Bio ", 51
(2006)855–874)。
The number of the single-stage image chain element of every group of N grades of image chain structures and the multifocal fixed fire of each single-stage image chain element
When the product of the focus number of line source is smaller, when such as the product less than 360, it is preferred to use iterative reconstruction algorithm is to luggage or package
Each faultage image is rebuild.About the realization process of iterative reconstruction algorithm, it may refer to Ruoqiao Zhang's et al.
Paper " Model-Based Iterative Reconstruction for Dual-Energy X-Ray CT Using a
Joint Quadratic Likelihood Model " (it is published in " IEEE Transactions on Medical
Imaging ", 2014,33:117-134).
When the number of the single-stage image chain element of every group of N grades of image chain structures and the multifocal of each single-stage image chain element
The product of the focus number of radiographic source, when between 360~720, it is preferred to use parsing and iterative mixing algorithm for reconstructing to luggage or
Each faultage image of package is rebuild；About the realization process of parsing and iterative mixing algorithm for reconstructing, may refer to
Paper " the Accurate iterative FBP reconstruction method for of Mengfei Li et al. people
Material decomposition of dual energy CT " (it is published in " IEEE Transactions on Medical
Imaging ", 2018).
Step S3: complete after luggage or package leave the last one single-stage image chain element of every group of N grades of image chain structures
At the acquisition of data for projection, and continue that successively remaining faultage image is rebuild and identified.
After luggage or package leave the last one single-stage image chain element of every group of N grades of image chain structures, complete current
N grades of image chain structures of group continue to current luggage or packet the acquisition of luggage or package data for projection using the method for step S2
The remaining faultage image do not rebuild and identified in wrapping up in successively carries out the reconstruction and identification of faultage image.
Step S4: after the reconstruction and identification of completing each faultage image of entire luggage or package, warning message is provided, with complete
At the complete detection of a package or package.
It, can in the luggage or package if identified after completing the reconstruction and identification of each faultage image of luggage or package
There can be prohibited items, that is, provide warning message, examine work in order to which security staff carries out subsequent packet of opening.
Multilevel energy type static state safety check CT system provided by the present invention, on the one hand using multiple by multifocal x-ray
The single-stage image chain element in source and detector assembly composition, constitutes N grades of image chain structures.By different in N grades of image chain structures
The exposure of timing radiographic source produces the image for having more high time resolution, more multi-power spectrum rank than spiral CT, improves luggage
In contraband discrimination and baggage check speed.On the other hand, this static state safety check CT system, which is got rid of, relies on slip ring, and
And multifocal x-ray source and detector do not need to rotate, and realize quiescent imaging without spin.Simultaneously because this static state safety check CT system
No rotary part of uniting to reduce the maintenance cost and noise of equipment improves the stability of equipment.
Multilevel energy type static state safety check CT system provided by the present invention and imaging method have been carried out specifically above
It is bright.For those of ordinary skill in the art, it is done under the premise of without departing substantially from true spirit any aobvious
And the change being clear to, it will all belong to the protection scope of the invention patent power.
Claims (10)
1. a kind of multilevel energy type static state safety check CT system, it is characterised in that including at least one set of N grades of image chain structure, the N
It is provided with luggage carousel on the inside of grade Image chain structural base, the N grades of image chain structure and the luggage carousel pass through
Rack is fixed on the predeterminated position of the static safety check CT system, and wherein N is positive integer；
N described in each group grades of image chain structure, which is expert in the direction of advance of Li Tongdao, successively sequentially arranges, also, N described in adjacent sets
Staggered arrangement between grade image chain structure.
2. multilevel energy type static state safety check CT system as described in claim 1, it is characterised in that:
N described in every group grades of image chain structure is made of N number of single-stage image chain element；
Each single-stage image chain element in N described in every group grades of image chain structure is expert at successively suitable in the direction of advance of Li Tongdao
Sequence arrangement, also, staggered arrangement between the adjacent single-stage image chain element.
3. multilevel energy type static state safety check CT system as claimed in claim 2, it is characterised in that:
Each single-stage image chain element includes multifocal x-ray source and detector assembly；Wherein, the multifocal X-ray
Radiographic source is formed by multiple focuses, is equidistant straight line arrangement between adjacent focal spots, angularly circular arc type is arranged or waited
Angle curve formula arrangement in any one.
4. multilevel energy type static state safety check CT system as claimed in claim 3, it is characterised in that:
For the same single-stage image chain element, multifocal x-ray source is formed by multifocal, is located at outermost
Two focuses of side to virtual rotation center line respectively with centrally located focus to the line of virtual rotation center
Between be formed by angle no more than 5 °, also, the line of two focuses to virtual rotation centers on the outermost side is formed
Angle be not more than 10 °.
5. multilevel energy type static state safety check CT system as claimed in claim 4, it is characterised in that:
Multifocal x-ray source is formed by multiple focuses, and the fan angle that beam corresponding with each focus opens is covered
The edge in lid luggage channel；Also, multifocal x-ray source and the detector group of each single-stage image chain element
The equivalent rotary angle that part is formed is not less than 180 ° of+max (theta1, theta2, theta3 ..., thetaM), wherein max
(theta 1, theta2, theta3 ..., thetaM) is to be formed by multiple focuses pair with multifocal x-ray source
Maximum fan angle is chosen in the fan angle that the beam answered opens.
6. multilevel energy type static state safety check CT system as claimed in claim 2, it is characterised in that:
The ray for controlling each single-stage image chain element is additionally provided in the multilevel energy type static state safety check CT system
Pipe or radiographic source transmitting/stopping transmitting grid-control switch.
7. multilevel energy type static state safety check CT system as claimed in claim 3, it is characterised in that:
The detector assembly includes arc-shaped detector carriage and multiple detectors, and multiple detector arrangements are with luggage
The center in channel is in the circular arc detector carriage in the center of circle, and multifocal X-ray described in multiple detector faces is penetrated
The middle position of multiple focuses of line source.
8. multilevel energy type static state safety check CT system as claimed in claim 7, it is characterised in that:
The detector be it is single can detector, dual intensity sandwich detectors, any one or more in photon counting detector group
It closes.
9. multilevel energy type static state safety check CT system as claimed in claim 8, it is characterised in that:
When the detector is the single row detector, the focus of the single row detector and multifocal x-ray source
X/Y plane altogether, and the middle position of multiple focuses in multifocal x-ray source described in the single row detector face；
Intermediate row detector and the multifocal when the detector is the multi-detector, in the multi-detector
Multiple focuses in x-ray source are total to X/Y plane, and multiple cokes in multifocal x-ray source described in the multi-detector face
The middle position of point.
10. a kind of imaging method passes through multilevel energy type static state safety check CT system described in any one of claim 1~9
It realizes, it is characterised in that include the following steps:
Luggage or package enter luggage channel and control the multifocal x-ray source of each single-stage image chain element according to default timing
In focus successively expose, and when acquiring luggage or package by each single-stage image chain element by corresponding detector assembly
Data for projection；
When the luggage or package reach the last one single-stage image chain element of every group of N grades of image chain structures, from luggage or
First faultage image of package starts, and successively each faultage image is rebuild and identified；
After the last one single-stage image chain element of N grades of image chain structures described in leaving every group when luggage or package, projection is completed
The acquisition of data, and continue that successively remaining faultage image is rebuild and identified；
After the reconstruction and identification of completing each faultage image of the entire luggage or package, warning message is provided, to complete
The complete detection of one luggage or package.
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| CN201811287240.9A CN109343135B (en) | 2018-10-31 | 2018-10-31 | Multi-level energy type static security check CT system and imaging method |
| JP2021523592A JP7352304B2 (en) | 2018-10-31 | 2019-03-06 | Multi-stage fixed safety inspection CT system and image forming method |
| AU2019373486A AU2019373486A1 (en) | 2018-10-31 | 2019-03-06 | Multi-energy static security ct system and imaging method |
| PCT/CN2019/077239 WO2020087825A1 (en) | 2018-10-31 | 2019-03-06 | Multi-energy static security ct system and imaging method |
| EP19879454.7A EP3872535A4 (en) | 2018-10-31 | 2019-03-06 | Multi-energy static security ct system and imaging method |
| US17/302,320 US11789175B2 (en) | 2018-10-31 | 2021-04-30 | Multi-energy static security CT system and imaging method |
| AU2023204307A AU2023204307A1 (en) | 2018-10-31 | 2023-07-04 | Multi-energy static security ct system and imaging method |
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