CN103385732A - Static CT (Computed Tomography) scanner - Google Patents
Static CT (Computed Tomography) scanner Download PDFInfo
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- CN103385732A CN103385732A CN2013103168137A CN201310316813A CN103385732A CN 103385732 A CN103385732 A CN 103385732A CN 2013103168137 A CN2013103168137 A CN 2013103168137A CN 201310316813 A CN201310316813 A CN 201310316813A CN 103385732 A CN103385732 A CN 103385732A
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Abstract
The invention discloses a static CT (Computed Tomography) scanner, which comprises an annular static X-ray source, an annular static detector system and annular collimator, wherein the annular detector system is concentrically arranged on the inner side of the annular X-ray source; the annular X-ray source comprises a plurality of X-ray sources for emitting X-rays; the annular collimator is rotationally arranged on the inner side of the annular detector system; the annular collimator comprises a plurality of regional collimators; the quantity of the regional collimators is equal to the quantity of the X-ray sources working simultaneously in the X-ray source; a gap is formed between two adjacent regional collimators; the gaps correspond to the X-ray sources working simultaneously; and X-rays emitted by the X-ray sources working simultaneously are emitted via corresponding gaps to opposite regional collimators, and are emitted to the annular detector system through the regional collimators. The static CT scanner can be used for effectively scanning scattered photons without using any extra monitoring detector, so that the overall cost can be effectively lowered.
Description
Technical field
The present invention relates to medical instruments field, relate in particular to a kind of static CT scanner.
Background technology
Computed tomography (computed tomography, CT) scanner is a kind of powerful medical imaging diagnosis equipment, it utilizes X ray to carry out successively transverse scan to a certain scope of human body, obtains projection information, then by computer, carries out date processing and image reconstruction.The imaging process of X ray is mainly: x-ray source produces X-ray, and X-ray is sentenced straight line path in the focus of x-ray source and launched to all directions.In X-ray that enters imaging object, the atom of a part of object to be imaged directly absorbs; A part of directly penetrate imaging object and arrive the detector relative with x-ray source, this part X-ray is direct projection X-ray, and also imaging is required just for their information.Yet in 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 the image reconstruction algorithm requirement,, even therefore this part X-ray arrives detector, also can't make contributions to imaging, therefore,, if can not reject this part X-ray, will increase on the contrary the noise of reconstructed image.
As shown in Figure 1,, for image reconstruction,, for obtaining the CT image of better quality, generally all wish to only have direct projection partly to arrive detector 2 by X-ray of x-ray source 1 emission, thus, namely can determine the path of X-ray according to the focus of x-ray source 1 and the incidence point on detector 2; But in the actual imaging process, part scattering X-ray also can enter detector, causes thus being difficult to determine exactly the path of X-ray, thereby affects the quality of CT image.
For solving the problem of X-ray scattering, in a kind of conventional CT scans instrument that uses at present, detector 2 is take the focus of x-ray source 1 as the center of circle, at x-ray source 1 collimator 3 before a side of detector 2 arranges, and the rear collimator 4 of the focus of pointing to described x-ray source 1 is set towards a side of x-ray source 1 at detector 2, detector 2 and x-ray source 1 are around human body rotating scanning, to obtain projection information, as shown in Figure 2.This CT scanner limits the scope of X ray by described front collimator 3, and by described rear collimator 4, further absorb and the inconsistent scattering of its direction X-ray, to suppress the interference of scattering X-ray, improve signal to noise ratio, realize tomographic image reconstructing more accurately.
But there are the shortcomings such as radiation dose is higher, imaging time is long, system structure is complicated, operation cost is high usually in this conventional CT scans instrument.
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 carbon nanotube field emission 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 for addressing the above problem.Yet, in this scheme,, because curved detector corresponding to each X-ray tube is difficult to take this X-ray tube as the center of circle, therefore, be difficult to adopt traditional collimator to absorb, suppress the impact of scattering X-ray on imaging, and then cause CT picture quality poor.
Application number is that the Chinese patent application of CN201210264323.2 discloses static CT scanner and the bearing calibration of scattering X-ray thereof, it monitors quantity and the spectral distribution of X-ray of scattering region by lay detector at scattering region, use this as the regional foundation of deducting the scattered photon impact of direct projection; Place simultaneously the annular sheet that collimates in the annular detector outer and reduce the impact of scattered photon.Although this scheme is effective,,, due to the use of monitoring detector, make the holistic cost of this static state CT scanner too high.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of static CT scanner, higher and affect the problem of CT image quality because of scattered photon to solve CT scanner cost in prior art.
Solving the technical scheme that technical problem of the present invention adopts is: a kind of static CT scanner is provided, it comprises annular x-ray source and annular detector system, described annular x-ray source and described annular detector system are all static is arranged at described static CT scanner, described annular detector system is arranged at the inboard of described annular x-ray source, and arrange with one heart with described annular x-ray source, described annular x-ray source comprises the x-ray source of a plurality of emission X ray.described static CT scanner also comprises annular collimator, described annular collimator rotatably is arranged at the inboard of described annular detector system, described annular collimator comprises a plurality of regional collimators, the quantity of described regional collimator equals the quantity of the x-ray source of working simultaneously in described annular x-ray source, all has a gap between two adjacent described regional collimators, described gap is corresponding with described x-ray source of working simultaneously, the X ray of described x-ray source emission of working simultaneously is via the described regional collimator of the described gap directive relative position of correspondence, and through described regional collimator, be incident upon described annular detector system.
In the present invention's one preferred embodiments, each described regional collimator is the focus of an x-ray source of relative position in described x-ray source of working simultaneously all.
In the present invention's one preferred embodiments, each described regional collimator all has a plurality of partitions, form a collimator crack between two adjacent described partitions, each described collimator slit all limits for the outgoing scope of the X ray to described x-ray source emission, and the collimator slit of same described regional collimator is the same focus in the described x-ray source of working simultaneously of relative position all.
In the present invention's one preferred embodiments, described annular detector system comprises two annular detectors in the outside that is positioned at described annular collimator, the crack that has corresponding described collimator slit between described two annular detectors, each described annular detector can carry out to X-ray the detector module composition of energy resolution by a plurality of.
In the present invention's one preferred embodiments, in described x-ray source of working simultaneously, the focus of arbitrary x-ray source is all corresponding with the center in corresponding described gap.
In the present invention's one preferred embodiments, the focus place circle that the focus of described a plurality of x-ray sources forms and described annular detector system is concentric.
In the present invention's one preferred embodiments, described static CT scanner also comprises frame and rotating disk, described rotating disk is arranged at described frame and can rotates with respect to described frame, described annular x-ray source and described annular detector system all are fixed in described frame, and described annular collimator is arranged at described rotating disk.
In the present invention's one preferred embodiments, described static CT scanner also comprises data collecting system, computer and power-supply system; Described data collecting system connects described annular detector system, is used for the signal of described annular detector system output is gathered; Described computer is connected with described data collecting system, processes with the data to described data collecting system collection, and according to the data of processing, carries out image reconstruction; Described power-supply system connects respectively described annular x-ray source, described annular detector system, described data collecting system and described computer, is used to described annular x-ray source, described annular detector system, described data collecting system and described computer that working power is provided.
In the present invention's one preferred embodiments, described annular x-ray source comprises three x-ray sources of working simultaneously, described annular collimator comprises three regional collimators and three gaps, and described three gaps rotate to the position of described three x-ray sources of working simultaneously of correspondence with the rotation of described annular collimator.
compared with prior art, static CT scanner provided by the invention has the following advantages: in described static CT scanner, annular x-ray source and annular detector system quiescence arrange, the annular collimator rotatably arranges, and described annular collimator comprises a plurality of regional collimators, all has a gap between two adjacent described regional collimators, described gap is corresponding with described x-ray source of working simultaneously, the X ray of described x-ray source emission of working simultaneously is via the described regional collimator of the described gap directive relative position of correspondence, and through described regional collimator, be incident upon described annular detector system, thus, on the one hand, rotate described annular collimator and can realize the exposure image of diverse location x-ray source, and need not rotary annular x-ray source and annular detector system, on the other hand, utilize described annular collimator, ABSORPTION AND SCATTERING photon effectively, and need not to use extra monitoring detector, and then can effectively reduce the holistic cost of described static CT scanner.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is X-ray subpath schematic diagram.
Fig. 2 is the imaging process schematic diagram of conventional CT scans instrument.
Fig. 3 is the schematic diagram of the static CT scanner that provides of a preferred embodiment of the present invention.
Fig. 4 is the local enlarged diagram of static CT scanner shown in Figure 3.
Fig. 5 is the schematic diagram of annular detector system in static CT scanner shown in Figure 3.
Fig. 6 is the schematic diagram of static CT scanner rotation tomography shown in Figure 3.
Fig. 7 is the position relationship schematic diagram of the focus of collimator partition and x-ray source in static CT scanner shown in Figure 3.
Fig. 8 is the another kind of position relationship schematic diagram of the focus of collimator partition and x-ray source in static CT scanner shown in Figure 3.
The specific embodiment
, in order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
See also Fig. 3 and Fig. 4, a preferred embodiment of the present invention provides a kind of static CT scanner 100, and it comprises frame 10, rotating disk 20, annular x-ray source 30, annular detector system 40 and annular collimator 50.
Described frame 10 is arranged at ground, is used for the whole described static CT scanner 100 of bearing support.
Described rotating disk 20 is arranged at described frame 10, and they can be with respect to described frame 10 rotations.
Described annular x-ray source 30 is static is arranged at described static CT scanner 100, described annular x-ray source 30 comprises the x-ray source 31 of a plurality of emission X ray, each described x-ray source 31 all has a focus, and the focus of described a plurality of x-ray sources 31 forms a focus place circle.In described a plurality of x-ray source 31, the quantity of the x-ray source 31 of working simultaneously is N.
In the present embodiment, described annular x-ray source 20 is fixedly installed in described frame 10, and namely it is relative static with described frame 10.
Described annular detector system 40 is static is arranged at described static CT scanner 100.Described annular detector system 40 is arranged at the inboard of described annular X ray radiographic source 30, and with described annular x-ray source 30, arranges with one heart, and while and described focus place circle are with one heart.
In the present embodiment, described annular detector system 40 is fixedly installed in described frame 10, and namely it is relative static with described frame 10.
Described annular collimator 50 rotatably is arranged at the inboard of described annular detector system 40, described annular collimator 50 comprises a plurality of regional collimators 51, and the quantity of described regional collimator 51 equals the quantity N of the x-ray source 31 of working simultaneously in described annular x-ray source 30.All have a gap 511 between two adjacent described regional collimators 51, described gap 511 and the described x-ray source of working simultaneously 31 are corresponding.The X ray of the described x-ray source of working simultaneously 31 emissions is via the described regional collimator 51 of the described gap 511 directive relative positions of correspondence, and the described regional collimator 51 of process is incident upon described annular detector system 40.Each described regional collimator 51 all has a plurality of partitions 513, forms a collimator crack 515 between two adjacent described partitions 513, and each described collimator slit 515 all limits for the outgoing scope of the X ray to described x-ray source 31 emissions.
Preferably, each described regional collimator 51 is the focus of an x-ray source 31 of relative position in the described x-ray source of working simultaneously 31 all, particularly, in same described regional collimator 51, described collimator slit 515 is the same focus in the described x-ray source of working simultaneously 31 of relative position all, and namely the extended line of described a plurality of partition 513 intersects at the same focus in the described x-ray source of working simultaneously 31 of relative position.
In the present embodiment, described annular collimator 50 is arranged at described rotating disk 20, it is with described rotating disk 20 with respect to described frame 10 rotations, and namely described annular collimator 50 can be with respect to described annular x-ray source 30 and 40 rotations of described annular detector system of static setting.
See also Fig. 5, in the present embodiment, described annular detector system 40 comprises two annular detectors 41 in the outside that is positioned at described annular collimator 50, the crack 411 that has corresponding described collimator slit 515 between described two annular detectors 41, each described annular detector 41 can carry out to X-ray detector module 413 compositions of energy resolution by a plurality of.
The mode of operation of described static CT scanner 100 is as follows: because described annular x-ray source 30 and described annular detector system 40 are arranged at described frame 10, static with respect to described frame 10, described annular collimator 50 is arranged at described rotating disk 20, with described rotating disk 20 rotations; When described annular collimator 50 rotates to a certain position, wherein the gap between adjacent area collimator 51 511 also rotates to correspondence position thereupon, at this moment, the focus of the x-ray source 31 in corresponding described gap 511 is namely exposed once, the X ray of described x-ray source 31 emissions namely is used for imaging, as shown in Figure 6.Be understandable that, along with described annular collimator 50 rotates to different positions, gap 511 between adjacent area collimator 51 is the x-ray source 31 of corresponding diverse location, thus, the X ray of the x-ray source emission of diverse location can be used for imaging accordingly, and then described static CT scan can realize rotating scan imaging.
See also Fig. 7, in the present embodiment one preferred version, in described static CT scanner 100, the quantity of the x-ray source 31 of working simultaneously is three, when described annular collimator 50 with 20 rotations of described rotating disk during to position as shown in Figure 7, the x-ray source 31 of working simultaneously is respectively x-ray source 31a, x-ray source 31b and x-ray source 31c, and the focus of described x-ray source 31a, described x-ray source 31b and described x-ray source 31c is respectively A, B and C.described annular collimator 50 comprises three regional collimators 51 and three gaps 511, described three regional collimators 51 are respectively first area collimator 51a, second area collimator 51b and the 3rd regional collimator 51c, described three gaps 511 are respectively the first gap 511ab, the second gap 511bc and the 3rd gap 511ca, described the first gap 511ab, described the second gap 511bc and described the 3rd gap 511ca respectively with described x-ray source 31a, described x-ray source 31b is corresponding with described x-ray source 31c, and the center line of respectively corresponding the described the 3rd regional collimator 511c, the center line of the center line of described first area collimator 511a and described second area collimator 511b.
Particularly, the center of circle O of focus A and described focus place circle all is positioned on the centrage of the described the 3rd regional collimator 51c, that is the extended line of a plurality of partitions 513 of the described the 3rd regional collimator 51c intersects at the focus A of the described x-ray source 31a of relative position; The center of circle O of focus B and described focus place circle all is positioned on the centrage of described first area collimator 51a, that is the extended line of a plurality of partitions 513 of described first area collimator 51a intersects at the focus B of the described x-ray source 31b of relative position; The center of circle O of focus C and described focus place circle all is positioned on the centrage of described second area collimator 51b, that is the extended line of a plurality of partitions 513 of described second area collimator 51b intersects at the focus C of the described x-ray source 31c of relative position.At this moment, the imaging effect of described static CT scanner 100 is better.
certainly, be not limited to this, in the described x-ray source of working simultaneously 31, the focus of arbitrary x-ray source 31 also can depart from the centrage in corresponding described gap 511, the focus A ' of x-ray source 31a ' as shown in Figure 8, be the center of circle O of the centrage of described the second collimator 51b without described focus place circle, that is the extended line of a plurality of partitions 513 of described the second collimator 51b intersects at the focus A ' of the described x-ray source 31a ' of relative position, also show that the focus A ' of described x-ray source 31a ' is not right against the centre position of described the first gap 511ab this moment, but there is certain departing from.
Be understandable that, in described static CT scanner 100, the quantity of the x-ray source 31 of working simultaneously is not limited to three, also can be two, four, five or other quantity, accordingly, described annular collimator 50 can comprise the regional collimator 51 of two, four, five or other quantity, specifically can design according to practical situation.
Be understandable that, described static CT scanner 100 also comprises data collecting system, computer and power-supply system (not shown), wherein, described data collecting system connects described annular detector system 40, is used for the signal of described annular detector system 40 outputs is gathered.Described computer is connected with described data collecting system, processes with the data to described data collecting system collection, and according to the data of processing, carries out image reconstruction.Described power-supply system connects respectively described annular x-ray source 30, described annular detector system 40, described data collecting system and described computer, is used to described annular x-ray source 30, described annular detector system 40, described data collecting system and described computer that working power is provided.
Be understandable that, described " annular " in the present embodiment can be for circular, oval etc., and the present invention is not as limit.
compared with prior art, static CT scanner 100 provided by the invention has the following advantages: in described static CT scanner 100, annular x-ray source 30 and the static setting of annular detector system 40, annular collimator 50 rotatably arranges, and described annular collimator 50 comprises a plurality of regional collimators 51, all has a gap 511 between two adjacent described regional collimators 51, described gap 511 and the described x-ray source of working simultaneously 31 are corresponding, the X ray of the described x-ray source of working simultaneously 31 emissions is via the described regional collimator 51 of the described gap 511 directive relative positions of correspondence, and through described regional collimator 51, be incident upon described annular detector system 40, thus, on the one hand, rotate described annular collimator 50 and can realize the exposure image of diverse location x-ray source 31, and need not rotary annular x-ray source 30 and annular detector system 40, on the other hand, utilize described annular collimator 50, ABSORPTION AND SCATTERING photon effectively, and need not to use extra monitoring detector, and then can effectively reduce the holistic cost of described static CT scanner 100.
The foregoing is only preferred embodiment of the present invention,, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. static CT scanner, it comprises annular x-ray source and annular detector system, described annular x-ray source and described annular detector system are all static is arranged at described static CT scanner, described annular detector system is arranged at the inboard of described annular x-ray source, and arrange with one heart with described annular x-ray source, described annular x-ray source comprises the x-ray source of a plurality of emission X ray; It is characterized in that:
described static CT scanner also comprises annular collimator, described annular collimator rotatably is arranged at the inboard of described annular detector system, described annular collimator comprises a plurality of regional collimators, the quantity of described regional collimator equals the quantity of the x-ray source of working simultaneously in described annular x-ray source, all has a gap between two adjacent described regional collimators, described gap is corresponding with described x-ray source of working simultaneously, the X ray of described x-ray source emission of working simultaneously is via the described regional collimator of the described gap directive relative position of correspondence, and through described regional collimator, be incident upon described annular detector system.
2. static CT scanner as claimed in claim 1, is characterized in that, each described regional collimator is the focus of an x-ray source of relative position in described x-ray source of working simultaneously all.
3. static CT scanner as claimed in claim 1, it is characterized in that, each described regional collimator all has a plurality of partitions, form a collimator crack between two adjacent described partitions, each described collimator slit all limits for the outgoing scope of the X ray to described x-ray source emission, and the collimator slit of same described regional collimator is the same focus in the described x-ray source of working simultaneously of relative position all.
4. static CT scanner as claimed in claim 3, it is characterized in that, described annular detector system comprises two annular detectors in the outside that is positioned at described annular collimator, the crack that has corresponding described collimator slit between described two annular detectors, each described annular detector can carry out to X-ray the detector module composition of energy resolution by a plurality of.
5. static CT scanner as claimed in claim 1, is characterized in that, in described x-ray source of working simultaneously, the focus of arbitrary x-ray source is all corresponding with the center in corresponding described gap.
6. static CT scanner as claimed in claim 1, is characterized in that, the focus place circle that the focus of described a plurality of x-ray sources forms and described annular detector system is concentric.
7. static CT scanner as claimed in claim 1, it is characterized in that, described static CT scanner also comprises frame and rotating disk, described rotating disk is arranged at described frame and can rotates with respect to described frame, described annular x-ray source and described annular detector system all are fixed in described frame, and described annular collimator is arranged at described rotating disk.
8. static CT scanner as claimed in claim 1, is characterized in that, described static CT scanner also comprises data collecting system, computer and power-supply system; Described data collecting system connects described annular detector system, is used for the signal of described annular detector system output is gathered; Described computer is connected with described data collecting system, processes with the data to described data collecting system collection, and according to the data of processing, carries out image reconstruction; Described power-supply system connects respectively described annular x-ray source, described annular detector system, described data collecting system and described computer, is used to described annular x-ray source, described annular detector system, described data collecting system and described computer that working power is provided.
9. static CT scanner as claimed in claim 1, it is characterized in that, described annular x-ray source comprises three x-ray sources of working simultaneously, described annular collimator comprises three regional collimators and three gaps, and described three gaps rotate to the position of described three x-ray sources of working simultaneously of correspondence with the rotation of described annular collimator.
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| CN109830420A (en) * | 2018-04-19 | 2019-05-31 | 新瑞阳光粒子医疗装备(无锡)有限公司 | A kind of annular X-ray emitter of fixed electron gun |
| CN109830420B (en) * | 2018-04-19 | 2021-07-30 | 新瑞阳光粒子医疗装备(无锡)有限公司 | Annular X-ray generator for fixing electron gun |
| CN113675060A (en) * | 2020-05-13 | 2021-11-19 | 聚束科技（北京）有限公司 | Scanning electron microscope |
| WO2022170603A1 (en) * | 2021-02-10 | 2022-08-18 | 西安大医集团股份有限公司 | Radiotherapy device and control method therefor |
| CN114047209A (en) * | 2021-12-24 | 2022-02-15 | 北京航星机器制造有限公司 | Distributed static CT system and imaging method |
| CN114280087A (en) * | 2021-12-24 | 2022-04-05 | 北京航星机器制造有限公司 | CT imaging system and imaging method |
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