CN102764137A - Static CT (computed tomography) scanner and scattering X-photon correction method thereof - Google Patents
Static CT (computed tomography) scanner and scattering X-photon correction method thereof Download PDFInfo
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Abstract
A static CT (computed tomography) scanner comprises an X-ray source system, a detector system, a data acquisition system, a power system and a computer. The X-ray source system comprises an annular X-ray source and a front annular collimator arranged at an exit of the annular X-ray source. The annular X-ray source comprises a plurality of X-ray source modules, a plurality of collimator slits limiting emitting scope of X rays are distributed on the front annular collimator. The detector system comprises two annular detectors with the slits in between which are arranged on the inner side of the front annular collimator. Each annular detector comprises a plurality of detector modules capable of distinguishing energies for X photons. The front annular collimator can completely cover detection area of the detector modules. The detector system further comprises two rear annular collimators arranged on the inner side of the annular detectors and two annular monitoring detectors. The data acquisition system is connected with the detector system and the monitoring detectors. The computer processes data acquired by the data acquisition system and then reconstructs images.
Description
Technical field
The present invention relates to medical instruments field, relate in particular to a kind of static CT scanner and the bearing calibration of scattering X-ray thereof.
Background technology
Computed tomography (computed tomography; CT) scanner is a kind of powerful medical imaging diagnosis equipment; It utilizes X ray that a certain scope of human body is carried out transverse scan successively, obtains projection information, carries out date processing and image reconstruction by computer again.The imaging process of X ray is mainly: x-ray source produces X-ray, and X-ray is launched to all directions with straight line path in the along of x-ray source.In X-ray that gets into imaging object, the atom of a part of object to be imaged directly absorbs; A part of then directly penetrate imaging object and arrive the detector relative with x-ray source, this part X-ray is direct projection X-ray, and their information also forms images required just.Yet in the real process, some X-ray can bump with the atom of imaging object, and changes the direction of motion, and the loss portion of energy, and this part X-ray is scattering X-ray.Because this part X-ray does not meet image reconstruction, even therefore this part X-ray arrives detector, also can't make contributions to imaging, therefore,, will increase the noise of reconstructed image on the contrary if can not reject this part X-ray.
As shown in Figure 1; For image reconstruction,, generally all hope to have only direct projection partly to arrive detector 2 by X-ray of x-ray source 1 emission for obtaining the CT image of better quality; Thus, the path that promptly can confirm X-ray according to the focus and the incidence point on the detector 2 of x-ray source 1; But in the actual imaging process, part scattering X-ray also can get into detector, causes being difficult to confirm exactly the path of X-ray thus, thereby influences the quality of CT image.
For solving the problem of X-ray scattering; In a kind of conventional CT scans appearance that uses at present, detector 2 is the center of circle with the focus of x-ray source 1, at x-ray source 1 collimator 3 before a side of detector 2 is provided with; And the back collimator 4 of the focus of pointing to said x-ray source 1 is set towards a side of x-ray source 1 at detector 2; Detector 2 centers on the human body rotation sweep with x-ray source 1, and is to obtain projection information, as shown in Figure 2.This CT scanner limits the scope of X ray through collimator 3 before said; And through the 4 further absorptions and the inconsistent scattering of its direction X-ray of said back collimator; To suppress the interference of scattering X-ray, improve signal to noise ratio, realize tomographic image reconstructing more accurately.
But this conventional CT scans appearance exists usually that radiation dose is higher, imaging time is long, shortcomings such as system structure is complicated, operation cost height.For this reason; Publication No. is that the Chinese invention patent application of CN102379716A discloses a kind of static CT scanner and scan method thereof; This static state CT scanner has proposed to adopt based on the annular x-ray source of CNT field-transmitting cathode X-ray tube with based on the scheme of the medical static energy resolution CT scanner of annular detector system development of tellurium zinc cadmium energy resolution detector, is used to address the above problem.Yet, in this scheme, be the center of circle because the corresponding curved detector of each X-ray tube is difficult to this X-ray tube, therefore, be difficult to adopt traditional collimator to suppress of the influence of scattering X-ray, and then cause CT picture quality relatively poor imaging.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of static CT scanner and the bearing calibration of scattering X-ray thereof, to improve the signal to noise ratio of the data for projection that detector gathers, reduces the influence of scattering X-ray to the CT scanner image quality.
Solving the technical scheme that technical problem of the present invention adopts is: a kind of static CT scanner is provided, and it comprises: x-ray source system, detector system, data collecting system, computer and power-supply system.Said x-ray source system comprises that an annular x-ray source and one are arranged at collimator before the annular in said annular x-ray source exit; Said annular x-ray source comprises several x-ray source modules based on CNT; Be distributed with several before the said annular on the collimator and be used for the collimator slit that the outgoing scope to X ray limits, the corresponding said collimator slit of each said x-ray source module; Said detector system is used to receive the X-ray beam of said x-ray source system emission; Said detector system comprises two annular detectors that are positioned at the preceding collimator of said annular inboard; The crack that has corresponding said collimator slit between said two annular detectors, each said annular detector is made up of several detector modules; Said data collecting system connects said detector system, is used for the data of said detector system output are gathered; Said computer is connected with said data collecting system; Said power-supply system connects said x-ray source system, said detector system and said data collecting system respectively, so that required high pressure and common power to be provided.Each said detector module includes interconnective detecting area and non-detecting area; Said detecting area is near said crack; Said non-detecting area is away from said crack; The range of exposures of collimator covers the detecting area of its inboard said detector module fully before the said annular, to avoid non-detecting area by x-ray bombardment, reduces the absorbed dose that scanning object received; Said detector system further comprises two annular back collimators and two annular monitoring detectors; Said two annular back collimators are arranged at the inboard of said two annular detectors; And lay respectively at the junction of the detecting area and the non-detecting area of corresponding detector module, be used for scattering X-ray of X ray is limited; Said two annular monitoring detectors are connected with said data collecting system, and collimators deviate from a side of the detecting area of said detector module after being arranged at said two annulars respectively accordingly; Said computer carries out image reconstruction after the data of said data collecting system collection are handled.
In the present invention's one preferred embodiment, each said annular monitoring detector is formed by several monitoring detector modules.
In the present invention's one preferred embodiment, said several monitoring detector modules are arranged at intervals at corresponding said annular back collimator equally spacedly and deviate from a side of the detecting area of said detector module.
In the present invention's one preferred embodiment, said annular monitoring detector adopts the mode of approximate or interpolation to obtain scattered photon counting and spectral distribution that the interval does not have the zone of said monitoring detector module.
In the present invention's one preferred embodiment, said two annular monitoring detectors and said two annular detectors start simultaneously, work asynchronously.
In the present invention's one preferred embodiment, said two annular back collimators are perpendicular to said two annular detectors and be parallel to each other.
In the present invention's one preferred embodiment, said several detector modules for can to X-ray carry out energy resolution based on the cadmic high count rate detector module of tellurium zinc.
In the present invention's one preferred embodiment, the spacing of the crack between said two annular detectors is greater than 0 and less than 5mm.
In the present invention's one preferred embodiment, the diameter range of said annular x-ray source and said two annular detectors is 0.2m to 1.5m.
The present invention provides a kind of scattering X-ray bearing calibration of above-mentioned static CT scanner in addition, and it comprises the steps: that said two annular detectors and said two annular monitoring detectors survey the X-ray beam of said annular x-ray source emission simultaneously respectively; Said data collecting system is gathered the data for projection of said detector system output and the data of said two annular monitoring detector outputs respectively; Said computer subtracts each other according to the data of preset rules and ratio and said two annular monitoring detector outputs according to the data for projection of said detector system output, promptly obtains the data for projection through scatter correction.
Compared with prior art; Static CT scanner provided by the invention has the following advantages: one of which; The range of exposures of collimator covers the detecting area of its inboard said detector module fully before the said annular; Can reduce the absorbed dose of imaging object effectively through the restriction range of exposures, the source of reducing scattered photon simultaneously; They are two years old; Two annular back collimators are set in the inboard of two annular detectors; Said two annular back collimators lay respectively at the junction of the detecting area and the non-detecting area of corresponding detector module; Be used for scattered photon is limited, further reduce the influence of X scattered photon on the basis with collimator before said annular; They are three years old; Utilization is arranged at two annular monitoring detectors of a side that said two annular back collimators deviate from the detecting area of said detector module; Can obtain the data of scattering X-ray effectively; Be used for the data that the tuning detector module is obtained,, reduce of the influence of scattering X-ray static CT scanner image quality to improve the signal to noise ratio of the data for projection that detector module gathers; Its four, said static CT scanner adopts the x-ray source module based on CNT, can effectively shorten imaging time, and its overall structure is simpler, is easy to safeguard that operation cost is lower.In addition; Scattering X-ray provided by the invention bearing calibration is easy to realize the correction to scattering X-ray; The data obtained of tuning detector module effectively improve the signal to noise ratio of the data for projection that detector module gathers, and reduce the influence of scattering X-ray to static CT scanner image quality.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is an X-ray subpath sketch map.
Fig. 2 is the imaging process sketch map of conventional CT scans appearance.
Fig. 3 is that the system of the static CT scanner that provides of first embodiment of the invention forms sketch map.
Fig. 4 is the composition sketch map of the axial section of the said static CT scanner of Fig. 3.
Fig. 5 is the schematic perspective view that the said static CT scanner of Fig. 4 does not comprise annular monitoring detector.
Fig. 6 is the decomposing schematic representation of static CT scanner shown in Figure 5.
Fig. 7 is a kind of sketch map that is provided with of the annular monitoring detector of static CT scanner shown in Figure 4.
Fig. 8 is that the another kind of the annular monitoring detector of static CT scanner shown in Figure 4 is provided with sketch map.
Fig. 9 is the flow chart of the scattering X-ray bearing calibration of the static CT scanner shown in Figure 3 that provides of second embodiment of the invention.
Figure 10 a is the spectral distribution figure of direct projection zone inscattering photon.
Figure 10 b is the spectral distribution figure of reference zone inscattering photon.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
See also Fig. 3, first embodiment of the invention provides a kind of static CT scanner 100, and it comprises x-ray source system 10, detector system 20, data collecting system 30, computer 40 and power-supply system 50.
Please consult Fig. 4 to Fig. 6 in the lump, said x-ray source system 10 comprises collimator 13 before an annular x-ray source 11 and the annular, and said annular x-ray source 11 is used to launch X ray, and it comprises several x-ray source modules 111 based on CNT; Collimator 13 is arranged at the exit of said annular x-ray source 11 before the said annular, is distributed with several collimator slit 131 on the collimator 13 before the said annular, and said collimator slit 131 is used for the X ray of said annular x-ray source 11 emissions is limited; Each said x-ray source module 111 all corresponding said collimator slit 131.
Said detector system 20 is used to receive the X ray of said x-ray source system 10 emissions, and said detector system 20 comprises two annular detectors 21 that are positioned at the inboard of collimator 13 before the said annular, two annular back collimators 23 and two annular monitoring detectors 25.
The shape of said two annular detectors 21 and the identical and coaxial setting of size, the crack 211 that has corresponding said collimator slit 131 between said two annular detectors 21, each said annular detector 21 is formed by several detector modules 213; Each said detector module 213 includes interconnective detecting area 2131 and non-detecting area 2133; Said detecting area 2131 is near said crack 211; Said non-detecting area 2133 is away from said crack 211, and the range of exposures of collimator 13 covers the detecting area 2131 of its inboard said detector module 213 fully before the said annular.Said several detector modules 213 are energy resolution digital detector module.With respect to Conventional detectors; The energy resolution digital detector can carry out energy resolution (detector and data collecting system are handled the time that X-ray approximately needs hundreds of nanosecond) to each X-ray; Not only, little noise signal is kept outside of the door, improved signal to noise ratio from suppressing the noise aspect through establishing threshold value; And obtained the energy information of each X-ray, improved signal to noise ratio from information increase aspect.This imaging mode can reduce radiation dose half the.In present embodiment, preferably adopt based on the cadmic high count rate detector module of tellurium zinc.The cadmic high count rate detector module of tellurium zinc belongs to a kind of of energy resolution digital detector, has higher signal to noise ratio.
Preferably; The range of exposures of collimator 13 just in time covers the detecting area 2131 of its inboard said detector module 213 fully before the said annular; Thus; Both can just avoid non-detecting area 2133 by x-ray bombardment, reduce the absorbed dose that scanning object received, and can avoid collimator 13 before the said annular too much to limit the X ray on the detecting area 2131 of the said detector module 213 that is projected to relative position again.
Further, said annular x-ray source 11 is 0.2m to 1.5m, preferably 1m with the diameter range of said two annular detectors 21.
Further, the spacing of the crack 211 between said two annular detectors 21 is preferably greater than 0 and less than 5mm.
Said two annular back collimators 23 are arranged at the inboard of said two annular detectors 21, and lay respectively at the junction of the detecting area 2131 and the non-detecting area 2133 of corresponding detector module 213, are used for the scattered photon of X ray is limited.
Said two annular monitoring detectors 25 are arranged at said two annular back collimators 23 respectively accordingly and deviate from a side of the detecting area 2131 of said detector module 213; Being said two annular monitoring detectors 25 is arranged at the outside of said two detector modules 213 respectively along axis direction, to obtain the data of scattering X-ray.
Preferably, said two annular back collimators 23 are perpendicular to said two annular detectors 21 and be parallel to each other.In the present embodiment, said several monitoring detector modules 251 also are that it can carry out energy resolution to X-ray based on the cadmic high count rate detector module of tellurium zinc.
As shown in Figure 7, in the present embodiment, each said annular monitoring detector 25 is formed by several monitoring detector modules 251, and said several monitoring detector modules 251 are joined around forming said annular monitoring detector 25 successively.Certainly, the set-up mode of said several monitoring detector modules 251 is not limited to present embodiment, as long as said two annular monitoring detectors 25 that said several monitoring detector modules 251 constitute can obtain the data of X scattered photon effectively.As shown in Figure 8; Said several monitoring detector modules 251 are arranged at intervals at corresponding said annular back collimator 23 equally spacedly and deviate from a side of the detecting area 2131 of said detector module 213; Thus, can reduce the quantity of said monitoring detector module 251.It is understandable that, between two at this moment adjacent said monitoring detector modules 251, have the clearance space that said monitoring detector module 251 is not set.In such cases, said annular monitoring detector 25 adopts the mode of approximate or interpolation to obtain scattered photon counting and spectral distribution that the interval does not have the zone of said monitoring detector module 251.
Preferably, said two annular monitoring detectors 25 start simultaneously, work asynchronously with said two annular detectors 21.Thus; Can guarantee said two annular monitoring detectors 25 and the concordance of said two 21 working times of annular detector, and then the x-ray photon data that make said two annular monitoring detectors 25 obtain scattering X-ray subdata and 21 acquisitions of said two annular detectors has temporal dependency.
Said data collecting system 30 connects said detector system 20 and said two annular monitoring detectors 25, is used for the said detector system 20 and the signal of said two annular monitoring detector 25 outputs are gathered.
Said computer 40 is connected with said data collecting system 30, handles with the data that said data collecting system 30 is gathered, and carries out image reconstruction according to the data of handling.
In the present embodiment, said computer 40 carries out scattering X-ray according to said detector system 20 with the data of said two annular monitoring detector 25 outputs to be proofreaied and correct, to rebuild the image that obtains better quality.
Said power-supply system 50 connects said x-ray source system 10, said detector system 20, said data collecting system 30 and said computer 40 respectively, so that required high pressure and common power to be provided.
It is understandable that X-ray of said annular x-ray source 11 emissions is successively on the detecting area 2131 of the said detector module 213 that projects relative position of collimator slit 131 and the crack 211 between said two annular detectors 21 through collimator 13 before the said annular.
It is understandable that said " annular " in the present embodiment can be circle, ellipse etc., the present invention is not as limit.
See also Fig. 9, second embodiment of the invention provides the scattering X-ray bearing calibration of said static CT scanner 100, and it comprises the steps:
S111: said two annular detectors 21 are surveyed the X-ray beam that said annular x-ray source 11 is launched respectively simultaneously with said two annular monitoring detectors 25.
It is understandable that; The X-ray beam that said two annular detectors 21 are surveyed comprises the direct projection photon of said annular x-ray source 11 emissions and the inboard scattered photon that produces by way of imaging object, and said thus detector system 20 promptly obtains the direct projection photon and the data for projection of the inboard scattered photon that produces by way of imaging object; The X-ray beam that said two annular monitoring detectors 25 are surveyed comprises said annular x-ray source 11 emission X-rays at the outside scattered photon that behind imaging object, produces, the data of the outside scattered photon that said thus two annular monitoring detectors 25 acquisitions produce by way of imaging object.
S113: said data collecting system 30 is gathered the data for projection of said detector system 20 outputs and the data of said two annular monitoring detector 25 outputs respectively.
The data for projection of said detector system 20 outputs that said data collecting system 30 is gathered; Be the X-ray beams that two annular detectors 21 are surveyed in the said detector system 20, that is the data for projection of the direct projection photon that obtains of said detector system 20 and the inboard scattered photon that produces by way of imaging object; The data of said two annular monitoring detector 25 outputs that said data collecting system 30 is gathered; Be said two X-ray beams that annular monitoring detector 25 is surveyed, that is the data of the outside scattered photon that produces by way of imaging object of said two annular monitoring detectors 25 acquisitions.
The imaging object that adopts X-ray that monte carlo method produces the 140keV electronic target to pass different materials through limit bundle, collimation arrives the physical process of detector and carries out analog computation, obtains scattering X-ray post-depositional spectral distribution in tellurium-zinc-cadmium detector of and reference zone regional like Figure 10 a and Figure 10 b direct projection shown in respectively.Discover: scattering X-ray in (1) direct projection zone (being the inboard scattered photon by way of the imaging object generation of said annular x-ray source 11 emissions) can not ignore the influence of final image reconstruction; (2) quantity and the spectral distribution of scattering X-ray in the quantity of scattering X-ray of reference zone (being the outside scattered photon by way of the imaging object generation of said annular x-ray source 11 emissions) and spectral distribution and direct projection zone are very approaching, can be similar to replacement each other.
Thus; Can proofread and correct the data for projection of said detector system 20 outputs through the data of said two annular monitoring detector 25 outputs; Promptly utilize the data for projection of the inboard scattered photon that the data of the outside scattered photon that produces by way of imaging object of said annular x-ray source 11 emissions that said two annular monitoring detectors 25 obtain produce to the direct projection photon of said annular x-ray source 11 emissions with by way of imaging object to proofread and correct; To improve the signal to noise ratio of the data for projection that said detector module 213 gathers, reduce of the influence of scattering X-ray to said static CT scanner 100 image quality.
S115: said computer 40 subtracts each other according to the data of preset rules and ratio and said two annular monitoring detector 25 outputs according to the data for projection of said detector system 20 outputs, promptly obtains the data for projection through scatter correction.
Thus, can from the data for projection of said detector system 20 outputs, reject or reduce the data of the scattered photon of said annular x-ray source 11 emissions, promptly carry out scatter correction.And then, can make and carry out the CT image that image reconstruction obtained according to the data for projection behind the scatter correction and have preferable quality.
It is understandable that; The scattering X-ray bearing calibration of described static CT scanner 100 provided by the invention is measured the outside scattered photon by way of the imaging object generation of said annular x-ray source 11 emissions through said two annular monitoring detectors 25; The inboard scattered photon by way of the imaging object generation of annular x-ray source 11 emissions described in the data that next partly or entirely alternative said detector system 20 obtains; To obtain the direct light subdata of more annular x-ray source 11 emissions, rebuild to carry out successive image.
Compared with prior art; Static CT scanner 100 provided by the invention has the following advantages: one of which; The range of exposures of collimator 13 covers the detecting area 2131 of its inboard said detector module 213 fully before the said annular; Can reduce the absorbed dose of imaging object effectively through the restriction range of exposures, the source of reducing scattered photon simultaneously; They are two years old; Two annular back collimators 23 are set in the inboard of two annular detectors 21; Said two annular back collimators 23 lay respectively at the junction of the detecting area 2131 and the non-detecting area 2133 of corresponding detector module 213; Be used for scattered photon is limited, further reduce the influence of X scattered photon on the basis with collimator 13 before said annular; They are three years old; Utilization is arranged at two annular monitoring detectors 25 of a side that said two annular back collimators 23 deviate from the detecting area 2131 of said detector module 213; Can obtain the data of scattering X-ray effectively; Be used for the data that tuning detector module 213 is obtained,, reduce of the influence of scattering X-ray static CT scanner 100 image quality to improve the signal to noise ratio of the data for projection that detector module 213 gathers; Its four, the x-ray source module 111 that said static CT scanner 100 adopts based on CNT can effectively shorten imaging time, and its overall structure is simpler, is easy to safeguard that operation cost is lower.In addition; Scattering X-ray provided by the invention bearing calibration is easy to realize the correction to scattering X-ray; The data obtained of tuning detector module 213 effectively; Improve the signal to noise ratio of the data for projection of detector module 213 collections, reduce of the influence of scattering X-ray static CT scanner 100 image quality.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. static CT scanner, it comprises:
The x-ray source system; Said x-ray source system comprises that an annular x-ray source and one are arranged at collimator before the annular in exit of said annular x-ray source; Said annular x-ray source comprises several x-ray source modules based on CNT; Be distributed with several before the said annular on the collimator and be used for the collimator slit that the outgoing scope to X ray limits, all corresponding said collimator slit of each said x-ray source module;
Detector system; Said detector system is used to receive the X ray of said x-ray source system emission; Said detector system comprises two annular detectors of the inboard that is positioned at the preceding collimator of said annular; The crack that has corresponding said collimator slit between said two annular detectors, each said annular detector can carry out the detector module composition of energy resolution to X-ray by several;
Data collecting system, said data collecting system connects said detector system, is used for the signal of said detector system output is gathered;
Computer, said computer is connected with said data collecting system; And
Power-supply system, said power-supply system connect said x-ray source system, the said data collecting system of said detector system and said computer respectively, so that required high pressure and common power to be provided;
It is characterized in that:
Each said detector module includes interconnective detecting area and non-detecting area; Said detecting area is near said crack; Said non-detecting area is away from said crack; The range of exposures of collimator covers the detecting area of its inboard said detector module fully before the said annular, to avoid non-detecting area by x-ray bombardment, reduces the absorbed dose that scanning object received; Said detector system further comprises two annular back collimators and two annular monitoring detectors; Said two annular back collimators are arranged at the inboard of said two annular detectors; And lay respectively at the junction of the detecting area and the non-detecting area of corresponding detector module, be used for scattering X-ray of X ray is limited; Said two annular monitoring detectors are connected with said data collecting system, and collimators deviate from a side of the detecting area of said detector module after being arranged at said two annulars respectively accordingly; Said computer carries out image reconstruction after the data of said data collecting system collection are handled.
2. static CT scanner as claimed in claim 1 is characterized in that, each said annular monitoring detector is formed by several monitoring detector modules.
3. static CT scanner as claimed in claim 2 is characterized in that, said several monitoring detector modules are arranged at intervals at corresponding said annular back collimator equally spacedly and deviate from a side of the detecting area of said detector module.
4. static CT scanner as claimed in claim 3 is characterized in that, said annular monitoring detector adopts the mode of approximate or interpolation to obtain scattered photon counting and spectral distribution that the interval does not have the zone of said monitoring detector module.
5. static CT scanner as claimed in claim 1 is characterized in that, said two annular monitoring detectors and said two annular detectors start simultaneously, work asynchronously.
6. static CT scanner as claimed in claim 1 is characterized in that, said two annular back collimators are perpendicular to said two annular detectors and be parallel to each other.
7. static CT scanner as claimed in claim 1 is characterized in that: said several detector modules for can to X-ray carry out energy resolution based on the cadmic high count rate detector module of tellurium zinc.
8. static CT scanner as claimed in claim 1 is characterized in that: the spacing of the crack between said two annular detectors is greater than 0 and less than 5mm.
9. static CT scanner as claimed in claim 1 is characterized in that: the diameter range of said annular x-ray source and said two annular detectors is 0.2m to 1.5m.
10. scattering X-ray bearing calibration like each described static CT scanner of claim 1～9; It is characterized in that, comprise the steps: that said two annular detectors and said two annular monitoring detectors survey the X-ray beam of said annular x-ray source emission simultaneously respectively; Said data collecting system is gathered the data for projection of said detector system output and the data of said two annular monitoring detector outputs respectively; Said computer subtracts each other according to the data of preset rules and ratio and said two annular monitoring detector outputs according to the data for projection of said detector system output, promptly obtains the data for projection through scatter correction.
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| WO2014131173A1 (en) * | 2013-02-28 | 2014-09-04 | 深圳市奥沃医学新技术发展有限公司 | Collimator assemble of variable radiation field sizes and radiation apparatus of the assembly |
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