CN107390255A - A kind of discrete detector of new CT - Google Patents
A kind of discrete detector of new CT Download PDFInfo
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- CN107390255A CN107390255A CN201710546321.5A CN201710546321A CN107390255A CN 107390255 A CN107390255 A CN 107390255A CN 201710546321 A CN201710546321 A CN 201710546321A CN 107390255 A CN107390255 A CN 107390255A
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- 238000003491 array Methods 0.000 claims abstract description 50
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 230000008878 coupling Effects 0.000 claims abstract description 23
- 238000010168 coupling process Methods 0.000 claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 claims abstract description 23
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 230000004397 blinking Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 24
- 239000013307 optical fiber Substances 0.000 claims description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000005622 photoelectricity Effects 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims description 2
- 210000003205 muscle Anatomy 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 10
- 229910052793 cadmium Inorganic materials 0.000 description 7
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 7
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- RFVFQQWKPSOBED-PSXMRANNSA-N 1-myristoyl-2-palmitoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)O[C@@H](COP([O-])(=O)OCC[N+](C)(C)C)COC(=O)CCCCCCCCCCCCC RFVFQQWKPSOBED-PSXMRANNSA-N 0.000 description 1
- 238000000333 X-ray scattering Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/2002—Optical details, e.g. reflecting or diffusing layers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/2018—Scintillation-photodiode combinations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/24—Measuring radiation intensity with semiconductor detectors
- G01T1/248—Silicon photomultipliers [SiPM], e.g. an avalanche photodiode [APD] array on a common Si substrate
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a kind of discrete detector of new CT, it is characterised in that including discrete scintillator arrays, fiber coupling body, electrooptical device array, detector mechanical mechanism body；Detector mechanical structure body includes box detector and detector collimater；Wherein, a scintillator fixation structure is provided with box detector, for box detector to be divided into radiation area and radiation isolated area, the box detector is provided with a gap parallel with the scintillator fixation structure, the gap is corresponding with the output end of the detector collimater, and the discrete scintillator arrays are arranged on the scintillator fixation structure；The discrete scintillator arrays are connected by the fiber coupling body with the electrooptical device array being arranged in the radiation isolated area, and the fiber coupling body is used to transmit the blinking light of the discrete scintillator arrays to the electrooptical device array.Present invention, avoiding the optical crosstalk between electrooptical device and not by x-ray irradiation.
Description
Technical field
The invention belongs to detector technology field, it is related to a kind of discrete detector, more particularly to it is a kind of for CT system
Discrete detector.
Background technology
In computed tomograph scanner system (CT), discrete detector detects in particular by the discrete detector of scintillator
Efficiency high, dynamic range are big, anti-light crosstalk or X ray crosstalk ability is strong, insensitive to irradiation damage, are particularly suited for high energy X
X-ray detection X or industry CT detection.
According to the difference of electrooptical device, the design of the discrete detector of scintillator-type is generally divided into three kinds：A, dodge
Bright body+photomultiplier, B, scintillator+CMOS photodiode linear arrays, C, scintillator+CCD linear arrays.
A scheme signal to noise ratio is fine, but photomultiplier is oversized, and detector integrated level is poor and involves great expense.
B schemes are as shown in figure 1, wherein scintillator 103 passes through the good optical cement of translucency with photodiode array 104
Coupling, after X ray 101 passes through detected material 102, scintillator 103 is ionized or is excited, send passage of scintillation light by photodiode line
Array 104 is converted into electric signal and independently amplifies output by CMOS105；Panel detector structure is compact, price is relatively cheap, but big agent
The part of amount sigmatron 101 is absorbed by tested substance, and a part is absorbed by scintillator 103, and some, which will be passed through, dodges
Bright body 103 is got on photodiode 104, causes the irradiation damage of photodiode 104.
C schemes mitigate X as shown in Fig. 2 wherein scintillator 201 is coupled by fiber coupling plate 202 with CCD linear arrays 203
Irradiation damage of the ray to CCD linear arrays 203；But CCD high integration causes the optical crosstalk between adjacent pixel not disappear
Remove, and CCD is radiated than more serious by X ray scattering；On the other hand, CCD pixel size is in micron dimension and integrated level height, hardly possible
It is general to use the very thin coupling of large-area flicker body 201 CCD device to be reduced with this in scintillator to couple discrete scintillator arrays
The X ray crosstalk in portion and optical crosstalk but detection efficient is also reduced simultaneously.
The content of the invention
For technical problem present in prior art, it is an object of the invention to provide a kind of compact-sized CT is discrete
Detector, will not both produce optical crosstalk between electrooptical device, and and can enough protects electrooptical device not by X ray spoke
According to, while solve the problems, such as discrete scintillator arrays module splicing seams gap again.
The technical scheme is that：
A kind of discrete detector of new CT, it is characterised in that turn including discrete scintillator arrays, fiber coupling body, photoelectricity
Change device array, detector mechanical mechanism body；The detector mechanical structure body includes box detector and detector collimater；Its
In, a scintillator fixation structure is provided with the box detector, for box detector to be divided into radiation area and radiation isolated area,
The box detector is provided with a gap parallel with the scintillator fixation structure, the gap and the detector collimater
Output end is corresponding, and the discrete scintillator arrays are arranged on the scintillator fixation structure；The discrete scintillator arrays
It is connected by the fiber coupling body with the electrooptical device array being arranged in the radiation isolated area, the optical fiber
Coupling body is used to transmit the blinking light of the discrete scintillator arrays to the electrooptical device array.
Further, the fiber coupling body includes input terminal mould, fibre bundle and output terminal mould；Wherein, it is described defeated
Enter terminal mould and be provided with multiple row optic fibre hole, each row optic fibre hole corresponds to a scintillator in the discrete scintillator arrays, described
Optical fiber one end in fibre bundle is inserted in the optic fibre hole respectively to be fixed；The output terminal mould is provided with multiple through holes, often
One end of one through hole is provided with a groove, corresponds to the optical-electrical converter on the electrooptical device array respectively；The photoelectricity
Optical-electrical converter insertion respective slot in switching device array；The optical fiber other end in the fibre bundle is inserted into the output
In the through hole of terminal mould.
Further, the input terminal mould is located at the radiation area, the output terminal mould is isolated positioned at the radiation
Area.
Further, the height of projection of optical-electrical converter and the depth of the groove in the optical-electrical converter array
Match somebody with somebody.
Further, the material of the output terminal mould is high density material；Wherein, the density of high density material>160g/
cm3。
Further, the discrete scintillator arrays are combined according to certain intervals by M*N bar scintillators and formed, scintillator it
Between insert high density material；The material of the scintillator fixation structure is high density material；Wherein, the density of high density material
>160g/cm3。
Further, the high density material is lead, tantalum, tungsten or tungsten-copper alloy.
Further, including multiple discrete scintillator arrays, multiple fiber coupling bodies, multiple optical-electrical converters
Part array, each discrete scintillator arrays are staggered front to back arrangement in radiating surface corresponding with the gap, are arranged on the flicker
On body fixation structure；Each discrete scintillator arrays by a fiber coupling body and are arranged on the radiation respectively
An electrooptical device array connection in isolated area.
Further, the electrooptical device in the electrooptical device array is silicon photomultiplier.
The discrete detectors of CT provided by the present invention include discrete scintillator arrays, fiber coupling body, electrooptical device battle array
Row, detector mechanical mechanism body.Wherein：Discrete scintillator arrays are combined according to certain intervals by the discrete scintillator of M*N bars and formed,
The high density materials such as tungsten, tantalum, lead, tungsten-copper alloy are inserted between discrete scintillator to eliminate the optics string between adjacent scintillator
Disturb and scatter crosstalk with X ray；The wherein density of high density material>160g/cm3。
Fiber coupling body includes input terminal mould, fibre bundle and output terminal mould：Input terminal mould and discrete scintillator battle array
Row coupling, output terminal mould couple with electrooptical device and eliminate the optical crosstalk between electrooptical device.Fiber coupling body
Blinking light is transmitted to electrooptical device by discrete scintillator arrays, made with reference to discrete scintillator arrays fixation structure
Electrooptical device and correlation electronics data collecting system are in different panel detector structure spaces from scintillator arrays, with this
Electrooptical device and correlation electronics are protected not by x-ray irradiation.The insertion of fibre bundle one end (and fixed) input terminal mould,
One end insertion (and fixed) output terminal mould.
Electrooptical device is used to passage of scintillation light being converted into electric signal and transmitted to Electronic data acquisition system, the present invention
Using compact-sized and big gain discrete solid-state or semi-conductor type electrooptical device, such as：Avalanche photodide
(APD), more pel array counters (MPPC) and silicon photomultiplier (SiPM) etc..
Detector mechanical structure body includes box detector and detector collimater, and wherein box detector is used to load, fixed
With each several part device of position locator.
The present invention provides a kind of layout type and is used to eliminate the gap problem in discrete scintillator linear array module splicing.
Compared with prior art, beneficial effects of the present invention：
1st, electrooptical device involved by detector of the present invention and electronics are in different spaces with discrete scintillator arrays,
It will substantially reduce by x-ray irradiation degree；
2nd, detector of the present invention carries out arbitrary form and shape based on compact-sized discrete electrooptical device to it
Alignment placement, composition array optical power conversion device matches discrete scintillator arrays；
3rd, detector of the present invention is designed to array opto-electronic conversion based on the big discrete electrooptical device of own gain
Device, each of which photoelectric conversion unit work independently, and detector signal to noise ratio is big, and detectable dynamic range is big, is particularly suitable for use in
Large scale high density is detected object；
4th, optical crosstalk problem is not present between electrooptical device involved by detector of the present invention；
5th, discrete scintillator arrays module can carry out seamless splicing involved by detector of the present invention.
Brief description of the drawings
Fig. 1 is " scintillator+CMOS photodiodes linear array " discrete panel detector structure schematic diagram；
Wherein, 101-X ray scintillators, 102- detected materials, 103- scintillators, 104- photodiode linear arrays,
105-CMOS (complementary metal oxide semiconductor).
Fig. 2 is " scintillator+CCD linear arrays " discrete panel detector structure schematic diagram；
Wherein, 201- large-area flickers body, 202- fiber coupling plates, 203-CCD linear arrays.
Fig. 3 is that optical fiber mould couples discrete scintillator linear array diagram；
Wherein, the discrete cadmium tungstate linear arrays of 301-, 302- input terminal moulds.
Fig. 4 is the single-row detail view of input terminal mould；
Fig. 5 couples diagram for output terminal mould with electrooptical device array；
501- electrooptical device arrays, 502- output terminal moulds.
Fig. 6 is output terminal mould and the sectional view of electrooptical device array coupled structure.
Fig. 7 is detector layout structure diagram；
701- scintillator arrays, 702- scintillator fixation structures, 703- box detectors, 704- electrooptical devices,
705- collimaters.
Embodiment
The present invention is explained in further detail with instantiation below in conjunction with the accompanying drawings.
Detector of the present invention uses discrete scintillator arrays as 1*128 cadmium tungstate pixel linear arrays.The present invention is in wolframic acid
Lead partition is inserted between cadmium pixel, is penetrated to eliminate the optical crosstalk between cadmium tungstate pixel and reduce the X between cadmium tungstate pixel
Line scatters crosstalk, and reflectorized material (such as TiO is wrapped up outside cadmium tungstate linear array2) increase light collection efficiency.
Detector of the present invention is using multifiber (end face bore d=0.25mm) to a scintillator pixels (light gasing surface：
Light extraction 0.3mm*1.5mm) is carried out, flicker light collection efficiency is increased with this.The present invention is for discrete scintillator arrays design phase
The optic fibre input end mould (as shown in Figure 3) answered, optic fibre input end mould 302 are provided with multiple row optic fibre hole, each row optic fibre hole pair
Answer discrete 301 1 pixels of cadmium tungstate linear array, be fixed in the hole of optical fiber insertion optic fibre input end mould 302, position and
Light is drawn.
Detector of the present invention uses silicon photomultiplier (Silicon of the electrooptical device for discrete
Photomultiplier,SiPM).Silicon photomultiplier gain G T.GT.GT 105, output electric pulse signal intensity is big, signal to noise ratio is good；Cause
This does not need numerous and diverse amplification read-out electronics can by digital collection.Silicon photomultiplier is compact-sized, can basis
Application demand is designed to that the photoelectricity of arbitrary shape and scale turns device array.
The present invention is as shown in Figure 5 for the corresponding optical fiber output terminal mould of electrooptical device Array Design.Optical fiber output
Terminal mould 502 has multiple through holes, and one end of each through hole is provided with a groove, corresponded to respectively on electrooptical device array 501
One optical-electrical converter；It will be inserted with reeded optical fiber output terminal mould 502 in the gap of electrooptical device array 501, it is each
Optical-electrical converter inserts a respective slot (height of projection of optical-electrical converter and the depth of groove in optical-electrical converter array
With), the fixation and positioning of optical fiber output terminal mould 502 and electrooptical device array 501 can be not only realized, can also be eliminated
Optical crosstalk between adjacent photo switching device, the structural section figure after combination are as shown in Figure 6.Meanwhile choose high density material
Optical fiber output terminal mould is processed, radiation shield and protection can also be carried out to electrooptical device.As shown in fig. 6, one group of optical fiber
One end gathers the light that a scintillator is sent, and the other end of this group of optical fiber is directly inserted into leading in optical fiber output terminal mould 502
In hole.
Scintillator arrays 701 carry out light with electrooptical device 704 by fibre bundle in detector of the present invention as shown in Figure 7
Transmission, and is spaced in different height spaces by scintillator fixation structure 702, protect in detector electrooptical device and
Electronics device is not by x-ray irradiation.Scintillator fixation structure 702 selects high density material, for separating x-ray irradiation area
(i.e. scintillator arrays 701 are located at radiation area, and electrooptical device 704 is isolated by fixed structure 702 to be located at x-ray irradiation
Outside area).Box detector 703 is used to load detector each several part device, and places side in scintillator and be provided with gap, and gap with
Collimater matching is easy to X ray only to incide on the scintillator of scintillator arrays.In collimater such as Fig. 7 705 indicate, use is highly dense
Degree material is processed into, and a seam is opened at the position where discrete scintillator arrays allows ray to pass through.
Scintillator arrays module 701 is staggered front to back layout arrangement in same plane (or scanning cross-section) in detector of the present invention
(as shown in Figure 7), eliminate multimode scintillator arrays splicing gap problem.
Claims (9)
1. a kind of discrete detector of new CT, it is characterised in that including discrete scintillator arrays, fiber coupling body, opto-electronic conversion
Device array, detector mechanical mechanism body；The detector mechanical structure body includes box detector and detector collimater；Its
In, a scintillator fixation structure is provided with the box detector, for box detector to be divided into radiation area and radiation isolated area,
The box detector is provided with a gap parallel with the scintillator fixation structure, the gap and the detector collimater
Output end is corresponding, and the discrete scintillator arrays are arranged on the scintillator fixation structure；The discrete scintillator arrays
It is connected by the fiber coupling body with the electrooptical device array being arranged in the radiation isolated area, the optical fiber
Coupling body is used to transmit the blinking light of the discrete scintillator arrays to the electrooptical device array.
2. the discrete detector of new CT as claimed in claim 1, it is characterised in that the fiber coupling body includes input mould
Tool, fibre bundle and output terminal mould；Wherein, the input terminal mould is provided with multiple row optic fibre hole, described in each row optic fibre hole correspondence
A scintillator in discrete scintillator arrays, optical fiber one end in the fibre bundle is inserted in the optic fibre hole respectively to be consolidated
It is fixed；The output terminal mould is provided with multiple through holes, and one end of each through hole is provided with a groove, corresponds to the optical-electrical converter respectively
An optical-electrical converter on part array；Optical-electrical converter insertion respective slot in the electrooptical device array；The light
The optical fiber other end in fine beam is inserted into the through hole of the output terminal mould.
3. the discrete detector of new CT as claimed in claim 2, it is characterised in that the input terminal mould is located at the radiation
Area, the output terminal mould are located at the radiation isolated area.
4. the discrete detector of new CT as claimed in claim 2, it is characterised in that photoelectricity turns in the optical-electrical converter array
The height of projection of parallel operation matches with the depth of the groove.
5. the discrete detector of new CT as claimed in claim 2, it is characterised in that the material of the output terminal mould is highly dense
Spend material；Wherein, the density of high density material>160g/cm3。
6. the discrete detector of new CT as claimed in claim 1, it is characterised in that the discrete scintillator arrays are by M*N bars
Scintillator is combined to be formed according to certain intervals, and high density material is inserted between scintillator；The material of the scintillator fixation structure
Expect for high density material；Wherein, the density of high density material>160g/cm3。
7. the discrete detector of new CT as described in claim 5 or 6, it is characterised in that the high density material be lead, tantalum,
Tungsten or tungsten-copper alloy.
8. the discrete detector of new CT as described in claim 1~6 is any, it is characterised in that including multiple discrete sudden strains of a muscle
Bright volume array, multiple fiber coupling bodies, multiple electrooptical device arrays, each discrete scintillator arrays with the seam
Radiating surface corresponding to gap is staggered front to back arrangement, is arranged on the scintillator fixation structure；Each discrete scintillator battle array
Row are connected by a fiber coupling body and the electrooptical device array being arranged in the radiation isolated area respectively
Connect.
9. the discrete detector of new CT as described in claim 1~6 is any, it is characterised in that the electrooptical device battle array
Electrooptical device in row is silicon photomultiplier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710546321.5A CN107390255B (en) | 2017-07-06 | 2017-07-06 | Novel CT discrete detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710546321.5A CN107390255B (en) | 2017-07-06 | 2017-07-06 | Novel CT discrete detector |
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| CN107390255A true CN107390255A (en) | 2017-11-24 |
| CN107390255B CN107390255B (en) | 2023-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133013A (en) * | 2018-02-02 | 2019-08-16 | 西门子医疗有限公司 | Detector module |
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| CN107390255B (en) | 2023-11-24 |
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