CN110428478A - The alternating light sources fan-beam X ray CT method of sampling and device - Google Patents
The alternating light sources fan-beam X ray CT method of sampling and device Download PDFInfo
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- CN110428478A CN110428478A CN201910636663.5A CN201910636663A CN110428478A CN 110428478 A CN110428478 A CN 110428478A CN 201910636663 A CN201910636663 A CN 201910636663A CN 110428478 A CN110428478 A CN 110428478A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/003—Reconstruction from projections, e.g. tomography
- G06T11/006—Inverse problem, transformation from projection-space into object-space, e.g. transform methods, back-projection, algebraic methods
Abstract
The invention discloses a kind of alternating light sources fan-beam X ray CT method of sampling and devices, wherein, method includes the following steps: during one week rotary scanning of scanning system, multiple X-ray sources are controlled successively periodically alternately to switch, so that each rotation angle only has an X-ray source and is in transmitting X-ray state, to obtain the data for projection of each light source；Using parallel beam CT data space as reference space, the data for projection of each light source is mapped to reference space, to analyze acquisition data distribution；The corresponding subset of projection data of each light source is rebuild, to obtain final reconstruction image.Multiple light sources similar in position are alternately produced the original fixed position single light source of X-ray substitution to this method during the scanning process, it is distributed scan data more uniformly in parallel beam CT data space, to promote scan data information content, and finally obtain high quality reconstruction image.
Description
Technical field
The present invention relates to radiography field, in particular to a kind of alternating light sources fan-beam X ray CT method of sampling and
Device.
Background technique
Object perspective is imaged in the characteristic that X ray CT imaging system decays in object when passing through object using X-ray,
It suffers from the fields such as medical treatment, safety check, industrial detection and is widely applied.It is flat that Hounsfield in 1972 designs First
Row beam CT, parallel beam CT are only with a light source and a detector, in each angle-data collection process, detector and
Light source is tangentially moved as shown in Fig. 1 (a) along scanning circular orbit, and this scanning mode realizes the parallel beam CT data acquisition of standard
Mode, but sweep time is up to a few hours.In subsequent development, CT data acquisition modes and system structure successive optimization.The
Two generations small fan angle parallel beam CT substitutes original single detector using multiple detectors on the basis of first generation parallel beam CT
As shown in Fig. 1 (b), in each angle-data collection process detector and light source still along scanning circular orbit tangential motion, by
Data are acquired simultaneously in multiple detectors, the step-length tangentially translated every time can significantly increase, and then reduce the scanning process used time.The
Three generations's fan beam CT further increases the detector number of detector array, and detector array can completely cover scan vision such as Fig. 1
(c) shown in, light source only rotates in orbit in scanning process, and there is no detectors and light source in each angle-data collection process
Tangential translational motion, the acquisition of data can be obtained the angle lower fan angular projection data, and fan beam CT makes to scan the used time and measuring
It is reduced in grade.Siemens Company in 2005 releases First double source CT, which has the x-ray source of two sets of independent fan beam CTs
And detector, two light sources are located at same rotation circular orbit, and 90 degree of phase difference such as Fig. 1 (d) is shown, during CT scan, two
Set fan-beam CT system acquires data simultaneously, further shortens the CT scan used time.Double source CT is in the fast imagings scene such as cardiac imaging
In have important application.While CT scan mode and system structure gradually upgrade, scan data is also turned by parallel beam CT data
Become fan beam CT data.Each data of fan beam CT acquisition, can be equivalent to a data of parallel beam CT data space
Point.In ideal continuous acquisition, fan beam CT data can fully equivalent be parallel beam CT.But in practical applications, data
Acquisition be it is discrete, after fan beam CT data are equivalent to parallel beam CT at this time, be no longer uniformly distributed in parallel beam CT data space, this
When image quality have certain loss compared to parallel beam CT.
Summary of the invention
The present invention provides a kind of alternating light sources fan-beam X ray CT method of sampling and device, to solve in parallel beam CT data
In the part subspace in space, fan beam data is densely distributed, information redundancy occurs, and in another part subspace fan beam data point
The technical issues of cloth is sparse, and acquisition information deficiency causes CT image reconstruction quality to be affected.
One aspect of the present invention embodiment provides a kind of alternating light sources fan-beam X ray CT method of sampling, comprising:
During one week rotary scanning of scanning system, controls multiple X-ray sources and successively periodically alternately switch, make
It obtains each rotation angle and only has an X-ray source in transmitting X-ray state, to obtain the data for projection of each light source；
Using parallel beam CT data space as reference space, the data for projection of each light source is mapped to the benchmark
Space, to analyze acquisition data distribution；And
The corresponding data for projection of each light source is rebuild, to obtain final reconstruction image.
Another aspect of the present invention embodiment provides a kind of alternating light sources fan-beam X ray CT sampling apparatus, comprising:
Module is obtained, for during one week rotary scanning of scanning system, controls multiple X-ray sources successively period
Property alternately switch so that each rotation angle only have an X-ray source be in emit X-ray state, to obtain each light source
Data for projection；
Mapping block is used for using parallel beam CT data space as reference space, by the data for projection of each light source
It is mapped to the reference space, to analyze acquisition data distribution；And
Module is rebuild, for rebuilding to the corresponding data for projection of each light source, to obtain final reconstruction image.
Technical solution of the present invention at least realizes following beneficial technical effect:
Multiple light sources similar in position are alternately produced the original fixed position single light source of X-ray substitution during the scanning process,
It is distributed scan data more uniformly in parallel beam CT data space, acquisition is distributed more reasonable data, sweeps to be promoted
It retouches data information amount and increases physical message amount, and finally obtain high quality reconstruction image.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is each generation CT scan system structure/scanning mode schematic diagram, wherein (a) is that parallel beam CT scan mode is illustrated
Figure (b) is the parallel beam CT scan schematic diagram of small fan angle, (c) is fan beam CT scanning mode schematic diagram, (d) is double source fan-beam
CT scan schematic diagram；
Fig. 2 is the alternating light sources fan-beam X ray CT method of sampling flow chart of one embodiment of the invention；
Fig. 3 is the alternating light sources fan beam CT system structure diagram of one embodiment of the invention；
Fig. 4 is a kind of specific alternating light sources CT system implementation diagram of one embodiment of the invention；
Fig. 5 is that alternating light sources CT system acquires data distribution schematic diagram in one embodiment of the invention；
Fig. 6 is other alternating light sources CT system implementation diagrams provided by the invention, wherein (a) is a kind of isoceles triangle
The alternative expression light-source system of shape arrangement is (b) a kind of alternative expression light-source system of parallax arrangement, is (c) general arrangement
Alternative expression light-source system；
Fig. 7 is the structural schematic diagram of the alternating light sources fan-beam X ray CT sampling apparatus of one embodiment of the invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Describe with reference to the accompanying drawings the alternating light sources fan-beam X ray CT method of sampling that embodiment according to the present invention proposes and
Device, wherein this method is proposed based on fan beam CT application background, can be applied to other common three-dimensional CT system structure such as cone-beams
CT, spiral CT etc. keep three-dimensional acquisition data distribution more reasonable, are also applied to multiple necks such as non-destructive testing, medical diagnosis, safety check
Domain.
Currently, fan beam CT is widely used in clinical medicine and industrial detection, the data acquired due to fan beam CT itself
It is distributed more uneven compared to parallel beam CT.In the subspace of parallel beam CT data space part, fan beam data is densely distributed, out
Existing information redundancy；And in another part subspace, fan beam data distribution is sparse, and acquisition information deficiency leads to CT image reconstruction quality
It is affected.Thus the present invention proposes a kind of fan beam CT thought of design of alternating light sources, during the scanning process position
Similar multiple light sources are alternately produced the original fixed position single light source of X-ray substitution, make scan data in parallel beam CT data
Space is more uniformly distributed, to promote scan data information content, and finally obtains high quality reconstruction image.
Fig. 2 is the alternating light sources fan-beam X ray CT method of sampling flow chart of one embodiment of the invention.
As shown in Fig. 2, the alternating light sources fan-beam X ray CT method of sampling the following steps are included:
In step s101, during one week rotary scanning of scanning system, multiple X-ray sources successively period is controlled
Property alternately switch so that each rotation angle only have an X-ray source be in emit X-ray state, to obtain each light source
Data for projection.
Wherein, the fan-beam CT system of alternating light sources has x-ray source similar in multiple positions, during rotary scanning,
Multiple x-ray source alternate emission X-rays substitute original single X-ray source, are distributed more reasonable CT acquisition number to obtain
According to, and then promote reestablishment imaging picture quality.
For example, these light source positions are close, and detector as shown in figure 3, the scanning system contains multiple X-ray sources
Array is identical with fan beam CT.In one week rotation scanning process, each light source successively periodically alternately switches in order, each
Rotation angle only has a light source and is in transmitting X-ray state.If scanning system, which rotates a circle, needs TrSecond, N is sampled altogether within one weeka
A angle is then T by the period modulation that a light source is switched to next light sourcer/NaSecond, different light is used under adjacent angular
Source is scanned.If shared NsA light source, then by first light source obtain data for projection beSecond
The data for projection that a light source obtains isSince under different scanning angle, light source position is not
It is identical, it can avoid the acquisition excessively intensive situation of data local distribution to a certain extent.
In system building, there are many modes easily realized to construct alternating light sources CT system, such as uses an X-ray ray machine
And emit it X-ray light splitting, emit X-ray from several close positions.When using a wherein branch ray, lead layer is used
Other branches are blocked, the alternating switching of light source is realized by adjusting lead layer circumstance of occlusion.
In step s 102, using parallel beam CT data space as reference space, the data for projection of each light source is mapped
To reference space, to analyze acquisition data distribution.
In one embodiment of the invention, reference space is a two-dimensional space, and each in the two-dimensional space
The corresponding data of point acquires ray, two dimension is respectively the angle of ray, the vertical range of origin to ray, so that sweeping
When retouching, each ray path can uniquely be mapped as a bit of the reference space.
Specifically, the basal profile that the parallel beam CT scan directly generated is image scanning in tomography is converted by Radon,
Using parallel beam CT data space as the reference space (abbreviation reference space) of analytical sampling data distribution.The reference space is one
A two-dimensional space, the corresponding data of every bit in space acquire ray, two dimension is respectively the angle of ray
Theta, the vertical range T of origin to ray.In fan-delta sandbody or other tomographies when scanning, each ray path can be unique
It is mapped as a bit of the reference space.Whether when designing alternating light sources CT, analyzing a kind of alternating light sources system rationally can be first
It is verified by procedure simulation, calculate the inclination angle theta of all acquisition rays in alternating light sources scanning and arrives initial point distance t, thus
These projection rays are mapped completely to reference space and analyze these data points in reference space distribution situation, if sampled point exists
In area-of-interest (FOV) (i.e. | t | in FOV radius) uniformly distribution, then alternative source CT design scheme is relatively reasonable.
In step s 103, the corresponding data for projection of each light source is rebuild, to obtain final reconstruction image.
The scanning mode of alternating light sources CT makes to acquire the increase of Data Physical information content, and algorithm for reconstructing will be in Raw projection data
Physical message be converted into visible image information.Parallel beam CT and fan-beam CT scan have standard exact reconstruction methods, such as filter
Back projection (FBP) analytic reconstruction.The fan beam CT of alternating light sources can be derived for each specific source layout
Corresponding Exact Reconstruction formula.
Wherein, general general method for reconstructing includes:
(1) accurate Analysis method for reconstructing: analytic reconstruction is carried out to each light source acquisition data respectively and obtains sparse angular weight
Image is built, then sparse angular reconstruction image is superimposed to obtain Exact Reconstruction image.
(2) it resets analytic reconstruction method: alternating light sources CT data being mapped to parallel beam CT data space, and pass through interpolation
Method obtains parallel beam CT data, then carries out parallel beam CT analytic reconstruction.
(3) iterative reconstruction approach: in a scan, although light source position is different under different angle, but still can be for tool
The fixed sytem matrix of body system-computed, and using statistics iterative algorithm to image reconstruction.
(4) neural network reconstruction method: being directed to specific system structure, to have supervision or the training of unsupervised mode to rebuild mind
Through network, complete to rebuild using the neural network that training is completed.
It should be noted that alternating light sources CT system is easy to accomplish in terms of constructed in hardware and algorithm for reconstructing.
Below with reference to a specific three light sources alternating light sources CT system embodiment, alternating light sources fan beam CT is further illustrated
Implementation method and advantage.
It should be noted that although alternately being switched using three light sources in this embodiment, alternating light sources fan-beam of the invention
CT system is not limited to three light sources, and distribution of light sources position is also not necessarily limited to light source position in the present embodiment and is distributed.
Firstly, implement to alternating light sources fan beam CT system structure, as shown in figure 4, rotation center is to equidistant detector
Array vertical range is dod=400mm, intersection point are located at equidistant detector center, detector overall length ld=1200mm, totally 20
Detector, each detector size are 60mm.There are three light sources for system tool, and wherein light source 1 is located at rotation center to detector
On the extended line of array vertical line, the radial distance of light source 1 to rotation center is dos_d1=400mm.Light source 2,3 is located at light source
1 with rotation center line two sides, and its projection on light source 1 and rotation center line is away from rotation center distance dos_d2=
dos_d3=400mm, i.e. light source 2,3 project on the line of light source 1 and rotation center and are overlapped with light source 1.And light source 2,3 arrive the company
The vertical range d of lineos_t2, dos_t3It is adjustable.The system is to when tomoscan, light source and detector are suitable around rotation center in plane
Hour hands rotate a circle, and obtain NaAttenuation data under=30 angles.Wherein β=1,4,7 ..., the data under 28 angle
It is obtained by the X-ray that light source 1 generates, β=2,5,8 ... the data under 29 angles are obtained by the X-ray that light source 2 generates, β=3,
6,9 ..., the data under 30 angles are obtained by the X-ray that light source 3 generates.In the present embodiment, due to drawing sampling to be clear
Point distribution map, uses biggish detector size and angle interval.Under practical context, generally simultaneously using smaller detector
Read detector data information under more perspective.
Secondly, influence of the alternating light sources scanning to acquisition data distribution is analyzed, specifically, alternating light sources CT is acquired
Data are mapped to parallel beam CT data spatial analysis methods.In the present embodiment, make dos_t2And dos_t3Keep equal, and gradually from 0mm
Increase to 120mm.Fig. 5 depicts different dos_tIn the case of alternating light sources CT data distribution, wherein dos_tIt is equivalent when=0mm
It is always on i.e. classical fan beam CT in light source 1, as a control group.Following phenomenon can be observed from Fig. 5, when use standard fan beam CT
When scanning, each detector corresponding t under different rotary angle is equal.Therefore the fan-beam CT scan t dimension sample compared with
It is sparse.When gradually increasing dos_tWhen to 30mm, since under different rotary angle, X-ray source relative position alternately changes,
Each detector corresponding t under different angle is slightly staggered in home position two sides, increases T dimension sample rate, at this time
The acquisition of alternating light sources CT data is relatively reasonable.When further increasing dos_tWhen to 120mm, although the distribution of data sampling point is still
More uniformly, it but at this time since light source offset is excessive, is spread in T dimension sampled point to two sides, central area sampling is gradually sparse.
To sum up, tangential offset can make acquisition data be converted into T dimension sample rate in Theta dimension sample rate, reasonably
It is more uniform that tangential offset is distributed acquisition data in reference space.In systems in practice, optimal dos_tAccording to scan angle degree,
Detector number and area-of-interest radius determine jointly.
Finally, image reconstruction is carried out, in the present embodiment, using accurate Analysis method for reconstructing, first to three light sources pair
The acquisition data subset answered carries out analytic reconstruction respectively, then obtains final reconstruction image to three width image superpositions.
It should be noted that as shown in fig. 6, in addition to the above tangential distribution of light sources embodiment, for different system structures
And geometric parameter, alternating light sources fan beam CT can also have other implementation methods to obtain more preferably effect.
The alternating light sources fan-beam X ray CT method of sampling proposed according to embodiments of the present invention, passes through light during the scanning process
Source quickly alternately switches, and acquisition is distributed more reasonable data, to increase physical message amount, the final high quality that obtains rebuilds figure
Picture, and use parallel beam CT data space as reference space, the data that other scanning modes obtain are mapped to benchmark sky
Between, and then analyze the reasonability of scanning mode and system structure.
In order to realize above embodiment, the invention also provides a kind of alternating light sources fan-beam X ray CT sampling apparatuses.
Fig. 7 is the alternating light sources fan-beam X ray CT sampling apparatus structural schematic diagram of one embodiment of the invention.
As shown in fig. 7, the alternating light sources fan-beam X ray CT sampling apparatus 10 includes: to obtain module 100, mapping block 200
With reconstruction module 300.
Wherein, module 100 is obtained, for controlling multiple X-ray sources during one week rotary scanning of scanning system
Successively periodically alternately switch, so that each rotation angle only has an X-ray source and is in transmitting X-ray state, to obtain
The data for projection of each light source.
In one embodiment of the invention, during one week rotary scanning of scanning system, comprising:
Emit X-ray light splitting using an X-ray ray machine and to it, X-ray is made to meet the close of preset condition from multiple
Position transmitting.
When using any one branch ray, other branches are blocked using lead layer, and real by adjusting lead layer circumstance of occlusion
The alternating switching of existing light source.
Mapping block 200, for using parallel beam CT data space as reference space, the data for projection of each light source to be reflected
It is mapped to reference space, to analyze acquisition data distribution.
Wherein, reference space is a two-dimensional space, and the corresponding data of the every bit in two-dimensional space acquires ray,
Two dimension is respectively the angle of ray, the vertical range of origin to ray, so that when scanning, each ray path
Uniquely it is mapped as a bit of reference space.
Module 300 is rebuild, for rebuilding to the corresponding data for projection of each light source, to obtain final reconstruction image.
In one embodiment of the invention, analytic reconstruction is carried out respectively to the corresponding subset of projection data of each light source,
Include:
Analytic reconstruction is carried out to the data for projection of each light source respectively, sparse angular reconstruction image is obtained, by sparse angle
Reconstruction image superposition is spent, final reconstruction image is obtained；Or
Alternating light sources CT data are mapped to parallel beam CT data space, and parallel beam CT number is obtained by interpolation method
According to, and carry out parallel beam CT analytic reconstruction；Or
In a scan, fixed sytem matrix is calculated scanning system, and image reconstruction is carried out using statistics iterative algorithm；
Or
According to specific system structure by have supervision or it is unsupervised in a manner of training rebuild neural network, utilize trained nerve
Network is rebuild.
It should be noted that the aforementioned explanation to alternating light sources fan-beam X ray CT method of sampling embodiment is also suitable
In the device, details are not described herein again.
The alternating light sources fan-beam X ray CT sampling apparatus proposed according to embodiments of the present invention, passes through light during the scanning process
Source quickly alternately switches, and acquisition is distributed more reasonable data, to increase physical message amount, the final high quality that obtains rebuilds figure
Picture, and use parallel beam CT data space as reference space, the data that other scanning modes obtain are mapped to benchmark sky
Between, and then analyze the reasonability of scanning mode and system structure.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of alternating light sources fan-beam X ray CT method of sampling, which comprises the following steps:
During one week rotary scanning of scanning system, controls multiple X-ray sources and successively periodically alternately switch, so that often
A rotation angle only has an X-ray source and is in transmitting X-ray state, to obtain the data for projection of each light source；
Using parallel beam CT data space as reference space, it is empty that the data for projection of each light source is mapped to the benchmark
Between, to analyze acquisition data distribution；And
The corresponding data for projection of each light source is rebuild, to obtain final reconstruction image.
2. the method according to claim 1, wherein described during one week rotary scanning of scanning system,
Include:
Emit X-ray light splitting using an X-ray ray machine and to it, makes X-ray from multiple close positions for meeting preset condition
Transmitting.
3. the method according to claim 1, wherein described during one week rotary scanning of scanning system,
Include:
When using any one branch ray, other branches are blocked using lead layer, and realize light by adjusting lead layer circumstance of occlusion
The alternating in source switches.
4. the method according to claim 1, wherein the reference space is a two-dimensional space, and described two
The corresponding data of every bit in dimension space acquires ray, two dimension is respectively the angle of ray, origin to ray
Vertical range, so that each ray path can uniquely be mapped as a bit of the reference space when scanning.
5. the method according to claim 1, wherein described carry out the corresponding data for projection of each light source
It rebuilds, comprising:
Analytic reconstruction is carried out to the data for projection of each light source respectively, obtains sparse angular reconstruction image, it will be described dilute
Angle reconstruction image superposition is dredged, the final reconstruction image is obtained；Or
Alternating light sources CT data are mapped to parallel beam CT data space, and parallel beam CT data are obtained by interpolation method, and
Carry out parallel beam CT analytic reconstruction；Or
In a scan, fixed sytem matrix is calculated the scanning system, and image reconstruction is carried out using statistics iterative algorithm；
Or
According to specific system structure by have supervision or it is unsupervised in a manner of training rebuild neural network, utilize trained neural network
It is rebuild.
6. a kind of alternating light sources fan-beam X ray CT sampling apparatus characterized by comprising
Module is obtained, for controlling the successively period sexual intercourse of multiple X-ray sources during one week rotary scanning of scanning system
For switching, so that each rotation angle only has an X-ray source and is in transmitting X-ray state, to obtain the throwing of each light source
Shadow data；
Mapping block, for using parallel beam CT data space as reference space, the data for projection of each light source to be mapped
To the reference space, to analyze acquisition data distribution；And
Module is rebuild, for rebuilding to the corresponding data for projection of each light source, to obtain final reconstruction image.
7. device according to claim 6, which is characterized in that it is described during one week rotary scanning of scanning system,
Include:
Emit X-ray light splitting using an X-ray ray machine and to it, makes X-ray from multiple close positions for meeting preset condition
Transmitting.
8. device according to claim 6, which is characterized in that it is described during one week rotary scanning of scanning system,
Include:
When using any one branch ray, other branches are blocked using lead layer, and realize light by adjusting lead layer circumstance of occlusion
The alternating in source switches.
9. device according to claim 6, which is characterized in that the reference space is a two-dimensional space, and described two
The corresponding data of every bit in dimension space acquires ray, two dimension is respectively the angle of ray, origin to ray
Vertical range, so that each ray path can uniquely be mapped as a bit of the reference space when scanning.
10. device according to claim 6, which is characterized in that corresponding to each light source in the reconstruction module
Data for projection is rebuild, comprising:
Analytic reconstruction is carried out to the data for projection of each light source respectively, obtains sparse angular reconstruction image, it will be described dilute
Angle reconstruction image superposition is dredged, the final reconstruction image is obtained；Or
Alternating light sources CT data are mapped to parallel beam CT data space, and parallel beam CT data are obtained by interpolation method, and
Carry out parallel beam CT analytic reconstruction；Or
In a scan, fixed sytem matrix is calculated the scanning system, and image reconstruction is carried out using statistics iterative algorithm；
Or
According to specific system structure by have supervision or it is unsupervised in a manner of training rebuild neural network, utilize trained neural network
It is rebuild.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470684A (en) * | 2019-08-01 | 2019-11-19 | 清华大学 | The alternating light sources X-ray spiral CT method of sampling and device |
| CN111265231A (en) * | 2019-04-15 | 2020-06-12 | 清华大学 | Distributed light source CT image reconstruction method and system |
| CN113848079A (en) * | 2021-08-30 | 2021-12-28 | 上海联影医疗科技股份有限公司 | Fault detection method and device of CT rotation angle information system and computer equipment |
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