CN206515487U - Helical CT device - Google Patents
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Abstract
The present disclosure proposes a kind of helical CT device.The helical CT device includes：Monitor station, for carrying object to be checked, the monitor station limits the detection space for being used to accommodate object to be checked being positioned above；Rotation support device, under detection state, surrounds the detection space, and can be rotated around the detection space in the plane parallel to first direction；Multiple x-ray sources, on the rotation support device, for sending the X-ray by the detection space；Multiple X-ray reception devices, corresponded with the multiple x-ray source, it is located opposite from respectively with the multiple x-ray source on the rotation support device, for gathering the X-ray signal through the detection space, wherein, the multiple x-ray source can be rotated with the multiple X-ray reception device with the rotation support device is consistent.
Description
Technical field
This disclosure relates to radiographic imaging arts, more particularly to spiral CT (computer tomography) equipment.
Background technology
With World Economics and the development of international trade, Container Transport more and more widely should in various countries' economy
With.At the same time, the safety inspection of container also becomes more important.Especially after " 911 " event in 2001, the world is each
State all strengthens for probably attacking, traffic in drugs, the safety inspection of smuggling etc., and improve examination criteria.In the several of safety inspection field
Plant in common detection method, X-ray transmission technology has the advantages that penetration capacity is strong, time of measuring is short, high resolution, therefore
It is usually used in the container cargo inspection on the ground such as airport, customs.However, with the raising and the development of technology of social demand, CT skills
Art is also from initial medical diagnosis and industrial nondestructive testing field are introduced in social public security field.
By development for many years, the scan mode of CT technologies progressively develops from thin straight X-ray beam, small fladellum, big fladellum
To spiral CT.From unlike initial common CT technologies, when being scanned using spiral CT, scanning support and measured object enter
The continuous motion of row, x-ray source counterbody screw type rotary, detector uninterruptedly acquired projections data, so as to obtain
The 3-D view of testee, and sweep time can be greatly shortened.In addition, CT technologies density in itself and atomic number point
The ability of distinguishing can also improve the material identification effect in checking process.
1991, Elscint companies were proposed double-layer spiral CT technologies first.Hereafter, other companies also develop successively
Multi-layer spiral CT technology., can be same within one week sweep time using multi-detector structure in this multi-layer spiral CT technology
When obtain multilayer data for projection, so as to expand detection area, high-quality three-dimensional reconstruction image can be obtained, and also improve
The scan efficiency of system.Conventional multilayer spiral CT has been used widely in fields such as medical science, but can not still be answered well
For the inspection to large-sized objects such as air containers.Specifically, it is contemplated that inconsistent, the X-ray of fan-shaped X-ray beam dose
The segment angle of beam preferably must be held within some higher limit.So as in the large-sized object volume ratio medical domain such as air container
Detection object it is much greater in the case of, same multi-layer spiral CT equipment wants to realize to the detection needs of air container
Bigger detection space.In addition, the penetration power of x-ray source is also the factor that must take into consideration, and x-ray source and detector are answered
The stability problem that miscellaneous structure and load-bearing are brought is also very important.
Therefore, a kind of helical CT device that can be checked with good performance realization large object is needed badly.
Utility model content
In order to solve the above-mentioned problems in the prior art, the present disclosure proposes a kind of helical CT device.
According to an aspect of this disclosure, it is proposed that a kind of helical CT device.The helical CT device includes：Monitor station, is used
In carrying object to be checked, the monitor station limits the detection space for being used to accommodate object to be checked being positioned above；Rotate branch
Support arrangement, under detection state, surrounds the detection space, and can surround the inspection in the plane parallel to first direction
Space is surveyed to be rotated；Multiple x-ray sources, on the rotation support device, for sending the X by the detection space
Ray；Multiple X-ray reception devices, are corresponded, respectively with the multiple x-ray source relatively with the multiple x-ray source
On the rotation support device, for gathering the X-ray signal through the detection space, wherein, the multiple X-ray
Source can be rotated with the multiple X-ray reception device with the rotation support device is consistent.
In one embodiment, the monitor station can be in the first direction and/or vertical with the first direction
Move in direction.
In one embodiment, the first direction is vertically oriented.
In one embodiment, the rotation support device is slip ring, the multiple x-ray source and the multiple X-ray
Reception device is arranged on the circumference of the slip ring, and corresponding x-ray source and X-ray reception device be located opposite from it is described
The both sides in the center of circle of circumference.
In one embodiment, under detection state, the center in the center of circle of the circumference of the slip ring and the detection space
Unanimously.
In one embodiment, the rotation support device is support.
In one embodiment, the x-ray source is X-ray accelerator.
In one embodiment, the x-ray source provides fan-shaped x-ray beam.
In one embodiment, the multiple x-ray source is disposed closely on the rotation support device, and described many
The fan-shaped x-ray beam that individual x-ray source is provided covers the detection space in overlapping minimum mode.
In one embodiment, the X-ray reception device includes multi-detector.
In one embodiment, the helical CT device also includes processor.The processor connects with the multiple X-ray
Receiving apparatus is connected, the 3-D view for being handled the X-ray signal gathered and being rebuild object to be checked.Wherein, it is described
Processor utilizes linear interpolation when being rebuild to the 3-D view.
In one embodiment, covering when the adjacent X-ray reception device of two in the multiple X-ray reception device
During lid overlapping ranges, the data of overlapping region are handled using compressed sensing technology.
The helical CT device proposed by using the disclosure, can be detected, and ensure that simultaneously to large object
Less system dimension, shorter detection time and higher detection quality.Thus, solve it is above-described in the prior art
The problem of, so that the need for meeting air harbor to large cargo inspection.
Brief description of the drawings
Fig. 1 shows the structure chart of the helical CT device of one embodiment according to the disclosure.
Fig. 2 shows the flow chart of the three-dimensional image reconstruction method of one embodiment according to the disclosure.
Fig. 3 shows the example flow diagram for the three-dimensional image reconstruction method realized based on the helical CT device shown in Fig. 1.
Embodiment
The specific embodiment of the disclosure is described more fully below, it should be noted that the embodiments described herein is served only for citing
Illustrate, be not limited to the disclosure.In the following description, in order to provide thorough understanding of this disclosure, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that：This public affairs need not be carried out using these specific details
Open.In other instances, in order to avoid obscuring the disclosure, known circuit, material or method are not specifically described.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
：It is comprised in reference to special characteristic, structure or the characteristic that the embodiment or example are described in the disclosure at least one embodiment.
Therefore, in each local phrase " in one embodiment " occurred, " in embodiment ", " example " of entire disclosure
Or " example " is not necessarily all referring to same embodiment or example.Furthermore, it is possible to will be specific with any appropriate combination and/or sub-portfolio
Feature, structure or property combination in one or more embodiments or example.In addition, those of ordinary skill in the art should manage
Solution, accompanying drawing is provided to the purpose of explanation provided herein, and accompanying drawing is not necessarily drawn to scale.Art used herein
Language "and/or" includes any and all combination for the project that one or more correlations are listed.
The disclosure is specifically described below with reference to accompanying drawing.
First, Fig. 1 shows the structure chart of the helical CT device 100 according to one embodiment of the disclosure.As illustrated,
Shown helical CT device 100 includes：Monitor station 110, rotation support device 120, two x-ray sources 130-1 and 130-2 are (hereafter
In, can be collectively referred to as 130), 140) two X-ray reception devices 140-1 and 140-2 (hereinafter, can be collectively referred to as.It may be noted that
It is, for the ease of description, simply two x-ray sources 130 and two X-ray reception devices 140 to be schematically illustrated in Fig. 1.
It should be understood that can be connect in the other embodiment of the disclosure including greater or lesser number of x-ray source 130 and X-ray
Receiving apparatus 140.
Monitor station 110 is used to carry object to be checked, and limits the inspection for being used to accommodate object to be checked being positioned above
Survey space 150.In one embodiment, the detection space 150 can (such as be built by the actual restriction of physical components
Wallboard on monitor station 110), or aid in what is limited by other technologies means (such as infra-red detection).Alternatively, it is described
Detect that space 150 can also be limited without any physical components, and be due up that there is the sky of specific dimensions on monitor station 110
Between.
In one embodiment, the monitor station 110 can be in the first direction and/or vertical with the first direction
Direction movement.Movement in a first direction, can conveniently place object to be checked, first be down to proper height, and it is to be checked right to place
As rear, then rise to the height of suitable CT measurements.Move in a direction perpendicular to the first direction, be easy to entering for spiral CT examination
OK, the speed moved horizontally will be determined by swing circle and measurement length.
In one embodiment, the first direction is vertically oriented (such as in Fig. 1).
Under detection state, monitor station 110 can rotate (the level side in such as Fig. 1 in the direction vertical with first direction
To), so as to be rotatably assorted with hereinafter rotation support device 120, realize the helical scanning to object to be checked.
Rotation support device 120 is as shown in the annulus in Fig. 1.It can be seen that, rotation support device 120 is shown as sliding in Fig. 1
Ring.It should be apparent that, in the other embodiment of the disclosure, the rotation support device 120 can also be tied by other
Structure realizes, such as support.Under detection state, the rotation support device 120 encloses in the plane parallel to first direction
Arrange, and can be rotated around the detection space 150 around the detection space 150.
X-ray source 130 is located on the rotation support device 120, is penetrated for sending by the X in the detection space 150
Line.
In one embodiment, the x-ray source 130 is X-ray accelerator, to provide the X-ray beam of higher-energy.
In one embodiment, the x-ray source 130 provides fan-shaped x-ray beam.
In one embodiment, the x-ray source 130-1 and 130-2 is disposed closely on the rotation support device, and
And the fan-shaped x-ray beam that the x-ray source is provided covers the detection space 150 in overlapping minimum mode.So can be more
The size of compressibility well.
Two compact arranged situations of x-ray source 130-1 and 130-2 are schematically illustrated in Fig. 1.X-ray source 130
Target spot to the central point for detecting space 150 apart from SO (i.e. the radius of turn of the target spot of x-ray source 130) is：
SO=R/sin (n θ/2)
In formula, R is the radius of border circular areas shown in Fig. 1, and θ is the segment angle of the X-ray beam of x-ray source 130, and n is to make
The quantity of x-ray source 130.With θ=θmaxExemplified by=45 °, during using single x-ray source 130, SO1S=R/sin
(22.5°)；Under the same terms, during using two compact arranged x-ray sources 130, SO2S=R/sin (45 °).So as to SO1S/
SO2S=1.848, i.e., when using two x-ray sources 130, the radius of turn of target spot is the situation using single x-ray source 130
1/1.848.Therefore, using multiple x-ray sources, the radius of turn SO of x-ray source target spot is efficiently reduced, system chi is have compressed
It is very little.
In order to ensure the enough data volumes of system acquisition and simplify detection system, reduce system cost, x-ray source 130 should
Beam frequency is gone out using higher.The reason is that in terms of projection data acquisitions amount size is on the less qualitative influence of algorithm for reconstructing
Consider, it is less qualitative to avoid, data for projection amount should be caused to be not less than imaging pixel number, i.e., (made in scanning process with detector
Exemplified by reception device)：The total degree for going out beam of x-ray source × multi-detector crystal total quantity >=three-dimensional image pixel number.
That is, for the reconstruction image of fixed pixel, to improve data for projection amount, higher x-ray source can be used
Go out beam frequency or using more detector crystal sum.But single row detector amount of crystals is either improved, or increase
Plus detector row, larger burden all is brought to system design, manufacture, operation, maintenance and cost etc., therefore, first choice improves X and penetrated
Line source goes out beam frequency.
X-ray reception device 140 is corresponded with the multiple x-ray source 130, respectively with the multiple x-ray source 130
It is located opposite from the rotation support device 120, for gathering the X-ray signal through the detection space 150.
In one embodiment, the X-ray reception device 140 includes multi-detector.Pass through the once exposure of x-ray source
Light, the view data of many levels can be obtained simultaneously, can expand detection area, reduce acquisition time, improved and checked efficiency.Often
Individual x-ray source 130 corresponds to one group of multi-detector respectively.Each group detector number and specification can be with identical, can also not
Together, respective data acquisition channel is corresponded to respectively.
In the case of the close arrangement of x-ray source 130, X-ray reception device 140 it is possible that overlapping, at this time, it may be necessary to
Adjacent X-ray reception device 140 is set diametrically to be slightly separated, so that overlapping situation can be realized.
The x-ray source 130 can be consistent with the rotation support device 120 with the multiple X-ray reception device 140
Rotate.
In Fig. 1, the rotation support device 120 is slip ring, and the x-ray source 130 and the X-ray receive dress
140 are put to be arranged on the circumference of the slip ring, and corresponding x-ray source 130 and X-ray reception device 140 are (for example, X-ray
Source 130-1 and X-ray reception device 140-1) be located opposite from the circumference the center of circle both sides.
In one embodiment, under detection state, in the center of circle of the circumference of the slip ring and the detection space 150
The heart is consistent.
In one embodiment, the helical CT device 100 also includes processor (not shown).Preferably, the processing
Device is connected with the X-ray reception device 140, for being handled the X-ray signal gathered and being rebuild object to be checked
3-D view.Wherein, the processor utilizes linear interpolation when being rebuild to the 3-D view.
Specifically, for CT scan, because the aspect data for projection of any one scan axis is imperfect, if directly
Volume artifact will be caused by connecing reconstruction, it is necessary to use Z axis (Z axis is in the direction that such as monitor station is moved horizontally) interpolation, such as 180 degree or
360 degree of linear interpolations.By taking the most frequently used 180 degree linear interpolation as an example, it is assumed that location of interpolation is Zimg, data acquiring location
It is Z (α+π) at a distance of the position of 180 ° of the sampled point for Z (α), then the data for projection after 180 ° of linear interpolations is：
pimg(n, m)=ω1P (n, m)+ω2p(n+NP, π, m)
Wherein, the data that p (n, m) collects for m-th of detector crystal under n-th of projection angle, p (n+NP, π, m) it is
Therewith at a distance of 180 ° of data for projection.Interpolation coefficient ω1And ω2Respectively：
Data for projection is carried out after linear interpolation processing, 3-D view is rebuild using image reconstruction algorithm, is such as filtered anti-
(FBP) method for reconstructing is projected, or with reference to iteration ordered subset expectation maximization value method (OSEM) or algebraically on the basis of FBP algorithms
The method for reconstructing such as iterative algorithm (ART).
In one embodiment, when the adjacent X-ray reception device 140 of two in the X-ray reception device 140
During the overlapped coverage of (for example, X-ray reception device 140-1 and 140-2 in Fig. 1), using compressed sensing technology counterweight
The data in folded region are handled.
Specifically, in case of shown in Fig. 1, and using multi-detector as X-ray reception device 140, by
There is certain size in x-ray source 130, two target spots can not possibly be completely superposed, ray is covered whole measured object, can not keep away
X-ray reception device 140-1 and 140-2 can occur partly overlap (as shown in Figure 1) in which exempt from.This segment overlap data can not be adopted
It is due to that exponential damping law is followed when X-ray is absorbed with traditional image reconstruction algorithm (such as FBP), one, overlapping projection number
According to the sum of multiple exponential functions can be regarded as, it is impossible to " lossless " expand into the linear function of finite length；If two be because will be by
Thing discretization is examined, then overlapping data for projection causes imaging system to owe fixed, it is impossible to correctly solved.In this regard, needing using certain
Processing, compressed sensing technology as described above.Under conditions of Deta sparseness and stochastical sampling is met, it can be used remote few
Recover picture quality in the quantity of Nyquist sample frequencys.Because original image has openness, data for projection is represented by：
In formula, NbAnd NrRespectively the detector crystal number of overlapping region and one week scanning projection angle；F is two dimension
Image array, vector M1,2For the 1st or 2 corresponding sytem matrix of x-ray source, element Ml,m,r(l=1,2；M=1,2 ...,
Nb；R=1,2 ..., Nr) sent for l-th of x-ray source under r-th of projection angle, ray and quilt that m-th of detector is received
The situation of thing interaction is surveyed, refers generally to the length of respective pixel and X-ray intersection.
For openness image, image to be reconstructed can be first converted into gradient image, then minimize this gradient image
L1Mould.Image reconstruction process is just so converted into the Nonlinear Optimization Problem under a constraints, iteration can be passed through
Algorithm for reconstructing, gradient descent method or convex set reflection method etc. are solved.
Fig. 2 is shown rebuilds 3-D view according to the data for projection obtained according to CT equipment of one embodiment of the disclosure
Method 200 flow chart.The CT equipment is not limited to helical CT device described in the embodiment of the present disclosure (as above
Described by reference picture 1), as long as the CT equipment includes multipair x-ray source and X-ray reception device.Hereinafter, it is
For the sake of description is convenient, when the details to method 200 is explained, by using the CT spirals shown in Fig. 1 come example
Show.
Specifically, methods described 200 starts from step S210, wherein, pass through multipair x-ray source and X-ray reception device
In every a pair of x-ray sources and X-ray reception device obtain corresponding data for projection.Then, in step S220, to every a pair
The data for projection that x-ray source and X-ray reception device are obtained carries out interpolation processing.Finally, in step S230, based on process
The data for projection of interpolation processing, 3-D view is rebuild using image reconstruction algorithm.Wherein, in step S230, for two pairs of tools
Have in the x-ray source and X-ray reception device of overlapping projection section, the process for two pairs of x-ray sources and X-ray reception device
The image reconstruction algorithm for the data that projection section overlapping with this is corresponding is with being used for other parts in the data for projection of slotting processing
Image reconstruction algorithm is different.
In step S210, connect by every a pair of the x-ray sources and X-ray in multipair x-ray source and X-ray reception device
Receiving apparatus obtains corresponding data for projection.By taking the spiral CT structure 100 shown in Fig. 1 as an example, 130-1 and 130-2 points of x-ray source
Do not launch X-ray, and X-ray reception device 140-1 and 140-2 receive the X-ray through object to be detected respectively, respectively
To corresponding data for projection.Preferably, the situation as shown in Fig. 1, two x-ray sources 130-1 and 130-2 covering model
Enclose and include the whole detection space (dimension corresponding to not facing directly just, on each layer with being distributed in paper vertical direction
It is also such) so that can be real using x-ray source 130-1 and 130-2 and X-ray reception device 140-1 and 140-2 data
Now to the reproduction of object 3-D view to be measured.
In step S220, the data for projection obtained to every a pair of x-ray sources and X-ray reception device is carried out at interpolation
Reason.In one embodiment, the interpolation processing is linear interpolation method.Still by taking the spiral CT shown in Fig. 1 as an example, due to any one
The aspect data for projection of individual scan axis is imperfect, it is necessary to fill gap by way of interpolation using existing data
There is the white space between data, so as to avoid volume artifact occur when rebuilding.Above, when describing Fig. 1, to example
The interpolation method of property is described, and will not be repeated here.
The data for projection handled by interpolation after enriching will be used to be rebuild in the next step.
In step S230, based on the data for projection handled by interpolation, 3-D view is rebuild using image reconstruction algorithm.
Here, image reconstruction algorithm can be traditional image reconstruction algorithm, such as FBP.However, it is necessary to what is considered is a bit, two pairs of phases
The projection of adjacent x-ray source and X-ray reception device is likely to overlap, for the region overlapped, tradition figure
As algorithm for reconstructing is no longer applicable, i.e. for overlapping region, it is necessary to using the algorithm different from traditional images algorithm for reconstructing, such as,
Utilize compressed sensing technology.When being described above for Fig. 1, the exemplary algorithm for overlapping region is carried out
Description, is equally repeated no more herein.
It should be understood that can equally include other included by conventional three-dimensional image rebuilding method in method 200
Conventional steps, such as, image noise reduction is smooth, image rectification, artifact region are rebuild etc..
Such as, Fig. 3 shows the one kind for the three-dimensional image reconstruction method 300 realized based on the helical CT device shown in Fig. 1
Specific example flow chart.It should be understood of course that each step in Fig. 3 and its put in order all be it is exemplary,
In other embodiment, other process steps can be increased or existing process step is deleted, the step in Fig. 3 can also be exchanged
Sequentially.
Exemplary three dimensional image reconstruction flow shown in Fig. 3 starts from the data acquisition of step 310, and by as described above
Interpolation 320 realize preliminary images rebuild 330.Next, by overlapping region process step 340 as described above.Need to refer to
Go out, although the step of preliminary reconstruction 330 and overlapping region processing 340 are shown as into two separation herein, they are same
Sample can be implemented as single step, i.e. different processing (such as, the steps of the method 200 in Fig. 2 are realized for different parts
Rapid S230 is such).
Then, the reconstruction flow also carries out image noise reduction smoothing processing in step 350, to improve signal to noise ratio.
In step 360, image rectification is carried out.Image rectification includes geometric correction, scatter correction, line correction, detection
The process such as device gain calibration and metal artifacts reduction.Except the bearing calibration being usually used in x-ray detection system, in container inspection
What be can not ignore in looking into is metal artifacts reduction.The step of metal artifacts reduction most critical is to be partitioned into metal artifacts region, i.e.,
Determine the border of metallic region, available threshold method, clustering procedure, edge detection method, mean value method or region-growing method etc..
In step 370, metal artifacts regional reconstruction is carried out.Wherein, to the region forward projection being partitioned into, it is determined that projection
The position of middle metallic traces.Then row interpolation is entered again, wherein, commonly use linear interpolation, cubic spline interpolation or quartic polynomial and insert
Value etc., to avoid streak artifact, comet formation artifact etc..
In step 380, contrast enhancement processing is carried out to the image of preliminary reconstruction.
Finally, in step 390, with the three-dimensional knot of the forms such as the two-dimensional cross section of 3 dimensional drawing or ad-hoc location display
Really.
A kind of exemplary embodiment that spiral CT described in the use disclosure given below is checked：
1st, monitor station is down to certain altitude first, places object to be checked, then rise to measurement height, uniform translation to measurement
Region.
2nd, using X-ray accelerator as radiographic source, to provide the X-ray beam of higher-energy.After accelerator is stable, with certain frequency
Rate sends X-ray, is received by corresponding detector.Accelerator and corresponding auxiliary equipment, are installed on slip ring or support, with spy
Survey device device and make synchronous rotary relatively.In order to reduce system dimension, using multiple more close accelerators of arrangement, to expand ray
Beam covers space.In order to ensure the enough data volumes of system acquisition and simplify detection system, system cost is reduced, accelerator should be adopted
Go out beam frequency with higher.
3rd, detector receives the X-ray beam through container, and control centre and data are sent the data to after signal conversion
Processing module.Multi-detector structure is used in the disclosure, and X-ray accelerator single exposure can obtain many levels simultaneously
View data, can expand detection area, reduce acquisition time, improve and check efficiency.Each X-ray accelerator, correspondence one
Group multi-detector, at the uniform velocity rotates on slip ring around pivot.Each group detector number and specification can with identical,
Can be different, respective data acquisition channel is corresponded to respectively.
4th, control centre's control X-ray emission device, detector assembly, slip ring system, monitor station and data processing module
Operation, controlled by Mechanical course, electrical equipment control and safety interlocking etc., coordinate whole measurement process, and data for projection is passed
Data processing centre is delivered to be imaged.This part can be realized or work station or machine by high performance single PC
Group.
5th, the data for projection that data processing centre gathers to detector is handled, and rebuilds the 3-D view of object.This
Process include interpolation of data pretreatment (such as 180 degree or 360 degree of linear interpolations), spiral CT image preliminary reconstruction (such as FBP algorithms,
Algorithm that ART algorithms or FBP-OSEM are combined etc.), the processing of multi-source overlapping region, image rectification, metallic region rebuild, image
Enhancing etc..
6th, it is last, the three-dimensional reconstruction image of object in tested aviation case is shown over the display.Object to be checked can be achieved
Three-dimensional quick nondestructive inspection, substantially increases inspection efficiency, the need for meeting air harbor to the quick inspection of lot cargo.
Detailed description above has elaborated numerous embodiments by using schematic diagram, flow chart and/or example.
In the case that this schematic diagram, flow chart and/or example are comprising one or more functions and/or operation, those skilled in the art
It should be understood that each function in this schematic diagram, flow chart or example and/or operation can be by various structures, hardware, soft
Part, firmware or they substantial any combination to realize individually and/or jointly.In one embodiment, the implementation of the disclosure
If the stem portion of the example theme can be believed by application specific integrated circuit (ASIC), field programmable gate array (FPGA), numeral
Number processor (DSP) or other integrated forms are realized.However, those skilled in the art will appreciate that reality disclosed herein
Applying some aspects of example can equally realize in integrated circuits on the whole or partly, be embodied as counting at one or more
The one or more computer programs run on calculation machine are (for example, be embodied as one run in one or more computer system
Individual or multiple programs), the one or more programs run on the one or more processors are embodied as (for example, being embodied as one
The one or more programs run on individual or multi-microprocessor), it is embodied as firmware, or be substantially embodied as aforesaid way
Any combination, and those skilled in the art are according to the disclosure, will be provided with design circuit and/or write software and/or firmware generation
The ability of code.In addition, it would be recognized by those skilled in the art that the mechanism of theme described in the disclosure can as diversified forms journey
Sequence product is distributed, and regardless of the actual particular type for being used for performing the signal bearing medium of distribution, disclosure institute
The exemplary embodiment for stating theme is applicable.The example of signal bearing medium includes but is not limited to：Recordable-type media, it is such as soft
Disk, hard disk drive, compact-disc (CD), digital universal disc (DVD), digital magnetic tape, computer storage etc.；And mode transmission is situated between
Matter, such as numeral and/or analogue communication medium (for example, optical fiber cable, waveguide, wired communications links, wireless communication link).
Although exemplary embodiment describing the disclosure with reference to several, it is to be understood that, term used is explanation and shown
Example property and nonrestrictive term.Because the disclosure can be embodied without departing from disclosed spirit or real in a variety of forms
Matter, it should therefore be appreciated that above-described embodiment is not limited to any foregoing details, and the spirit that should be limited in appended claims
With widely explained in scope, therefore the whole changes fallen into claim or its equivalent scope and remodeling all should be the power of enclosing
Profit requires to be covered.
Claims (12)
1. a kind of helical CT device, including：
Monitor station, for carrying object to be checked, the monitor station limits the inspection for being used to accommodate object to be checked being positioned above
Survey space；
Rotation support device, under detection state, surrounds the detection space in the plane parallel to first direction, and can
Rotated around the detection space；
Multiple x-ray sources, on the rotation support device, for sending the X-ray by the detection space；
Multiple X-ray reception devices, are corresponded, respectively status relative with the multiple x-ray source with the multiple x-ray source
In on the rotation support device, for gathering the X-ray signal through the detection space,
Wherein, the multiple x-ray source can turn with the multiple X-ray reception device with the rotation support device is consistent
It is dynamic.
2. helical CT device according to claim 1, wherein, the monitor station can the first direction and/or with
The vertical direction movement of the first direction.
3. helical CT device according to claim 2, wherein, the first direction is vertically oriented.
4. helical CT device according to claim 1, wherein, the rotation support device is slip ring, the multiple X-ray
Source and the multiple X-ray reception device are arranged on the circumference of the slip ring, and corresponding x-ray source and X-ray are received
Device is located opposite from the both sides in the center of circle of the circumference.
5. helical CT device according to claim 4, wherein, under detection state, the center of circle of the circumference of the slip ring with
The center in the detection space is consistent.
6. helical CT device according to claim 1, wherein, the rotation support device is support.
7. helical CT device according to claim 1, wherein, the x-ray source is X-ray accelerator.
8. helical CT device according to claim 1, wherein, the x-ray source provides fan-shaped x-ray beam.
9. helical CT device according to claim 8, wherein, the multiple x-ray source is disposed closely to the rotation branch
On support arrangement, and the fan-shaped x-ray beam that the multiple x-ray source is provided covers the detection sky in overlapping minimum mode
Between.
10. helical CT device according to claim 1, wherein, the X-ray reception device includes multi-detector.
11. helical CT device according to claim 1, in addition to：Processor, connects with the multiple X-ray reception device
Connect, the 3-D view for being handled the X-ray signal gathered and being rebuild object to be checked,
Wherein, the processor utilizes linear interpolation when being rebuild to the 3-D view.
12. helical CT device according to claim 11, wherein, when two phases in the multiple X-ray reception device
During the overlapped coverage of adjacent X-ray reception device, the data of overlapping region are handled using compressed sensing technology.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526686A (en) * | 2016-12-07 | 2017-03-22 | 同方威视技术股份有限公司 | Spiral CT equipment and three-dimensional image reconstruction method |
| CN108542413A (en) * | 2018-05-09 | 2018-09-18 | 清华大学 | CT examination system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526686A (en) * | 2016-12-07 | 2017-03-22 | 同方威视技术股份有限公司 | Spiral CT equipment and three-dimensional image reconstruction method |
| WO2018103355A1 (en) * | 2016-12-07 | 2018-06-14 | 同方威视技术股份有限公司 | Spiral ct device and three-dimensional image reconstruction method |
| US11346975B2 (en) | 2016-12-07 | 2022-05-31 | Nuctech Company Limited | Spiral CT device and Three-dimensional image reconstruction method |
| CN108542413A (en) * | 2018-05-09 | 2018-09-18 | 清华大学 | CT examination system |
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