KR101684780B1 - Variable pin-hole collimator, radiation imaging device and radiation detecting device using the same - Google Patents
Variable pin-hole collimator, radiation imaging device and radiation detecting device using the same Download PDFInfo
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- KR101684780B1 KR101684780B1 KR1020150061557A KR20150061557A KR101684780B1 KR 101684780 B1 KR101684780 B1 KR 101684780B1 KR 1020150061557 A KR1020150061557 A KR 1020150061557A KR 20150061557 A KR20150061557 A KR 20150061557A KR 101684780 B1 KR101684780 B1 KR 101684780B1
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- pinhole
- collimator
- variable
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- pinhole collimator
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- 230000005855 radiation Effects 0.000 title claims abstract description 98
- 238000003384 imaging method Methods 0.000 title claims abstract description 39
- 230000003902 lesion Effects 0.000 claims description 31
- 238000005259 measurement Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 12
- 238000002603 single-photon emission computed tomography Methods 0.000 abstract description 15
- 230000005251 gamma ray Effects 0.000 description 13
- 230000035945 sensitivity Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000002285 radioactive effect Effects 0.000 description 3
- 238000003325 tomography Methods 0.000 description 3
- 230000001066 destructive effect Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009206 nuclear medicine Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000000746 body region Anatomy 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 229940121896 radiopharmaceutical Drugs 0.000 description 1
- 239000012217 radiopharmaceutical Substances 0.000 description 1
- 230000002799 radiopharmaceutical effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/06—Diaphragms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
- A61B6/4258—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector for detecting non x-ray radiation, e.g. gamma radiation
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K7/00—Gamma- or X-ray microscopes
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- High Energy & Nuclear Physics (AREA)
- Pathology (AREA)
- Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- Radiology & Medical Imaging (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
- Nuclear Medicine (AREA)
Abstract
The present invention relates to a variable pinhole collimator device, and a radiation imaging device and a radiation sensing device using the same. A variable pinhole collimator according to the present invention includes: a plurality of pinhole plates each having a plurality of through holes having diameters different from each other formed on a surface of the plate, the lens plates being stacked in a direction of incidence of radiation; And a plurality of driving modules for moving each of the pinhole plates so that one of the plurality of through holes formed in each of the pinhole plates is selectively positioned in the overlapping region to form a pinhole in the overlapping region. Accordingly, it is possible to change the characteristics of the pinhole collimator such as the angle of view or the hole diameter of the pinhole collimator applied to the radiation imaging apparatus such as the gamma camera or the single photon emission computed tomography apparatus, but it can be implemented with a thinner thickness.
Description
The present invention relates to a variable pinhole collimator and a radiation imaging apparatus and a radiation sensing apparatus using the same. More particularly, the present invention relates to a variable pinhole collimator apparatus and a radiation imaging apparatus using the variable pinhole collimator apparatus, The present invention relates to a variable pinhole collimator apparatus for determining a passage region and a direction of radiation, and a radiation imaging apparatus and a radiation detection apparatus using the same.
Radiographic imaging devices are devices that acquire images using radioactive isotopes and are widely used in the fields of nuclear medicine diagnosis and non-destructive examination.
BACKGROUND ART Radiographic imaging devices used in the field of nuclear medicine diagnosis, for example, gamma-ray cameras using a gamma ray or single photon emission computed tomography apparatuses, can be used for other diagnostic devices for providing structural information of the human body such as magnetic resonance imaging (MRI) Unlike diagnostic devices, functional information of the human body is provided using radioactive drugs.
Fig. 1 is a diagram showing the configuration of a
The
The
1, the
The gamma rays that have passed through the
The single photon emission computed tomography apparatus using the principle of the gamma ray camera as described above was invented in 1976. It was first developed by W. I. Keys, 1979. Brain-specific devices were developed by R. J. Jaszczak.
The single photon emission computed tomography apparatus is similar to the operation principle of the
Therefore, the
3 is a view for explaining the principle of the gamma ray imaging apparatus 1a using the
Referring to FIG. 3, the
The resolution and sensitivity of the gamma ray imaging apparatus 1a using the
However, in the case of the
For example, it is possible to detect gamma rays emitted from a wider area as the angle of view is wider. However, as shown in FIG. 3, since a region of interest (ROI) such as a lesion is located inside the living body T If the
Particularly, in the case of a single-photon emission computed tomography apparatus, the periphery of the living body is photographed while being rotated. When the
4 (a), the
In order to solve such a disadvantage, after replacing the
However, in the case of the method shown in FIG. 4 (b), the distance between the lesion L and the
In order to solve the above problems, a pinhole collimator capable of adjusting the angle of view has been proposed in the 'Variable Pinhole Type Collimator Apparatus and Radiation Imaging Apparatus Using the Same' disclosed in Korean Patent Publication No. 10-1364339 filed by the present applicant have.
However, in the case of the pinhole collimator disclosed in Korean Patent Publication, a plurality of diaphragms are stacked to adjust the angle of view or the direction of the pinhole. In order to configure one diaphragm, a plurality of plates must be used, There is a problem that the number of plates increases by the product of the number of diaphragms constituting the pinhole collimator and the number of plates constituting one diaphragm, thereby increasing the thickness of the pinhole collimator.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a pinhole collimator, which is applied to a radiation imaging apparatus such as a gamma camera or a single photon emission computed tomography The present invention provides a variable pinhole collimator capable of realizing a thinner thickness, and a radiographic imaging apparatus and a radiation sensing apparatus using the same.
According to the present invention, there is provided a variable pinhole collimator, comprising: a plurality of pinhole plates each having a plurality of through-holes each having a different diameter on a surface of the plate, And a plurality of drive modules for moving each of the pinhole plates so that one of the plurality of through holes formed in each of the pinhole plates is selectively positioned in the overlapping region to form a pinhole in the overlapping region. This is accomplished by a pinhole collimator.
Here, the plurality of through-holes formed in one pinhole plate are arranged along the longitudinal direction of the pinhole plate; The driving module may linearly move the pinhole plate in the longitudinal direction such that any one of the plurality of through holes formed in the pinhole plate is located in the overlapping area.
Further, the plurality of pinhole plates are arranged radially about the overlapping region; The through-holes formed in each of the pinhole plates may be concentrated in the overlapping region to form the pinhole or be radially spaced from the overlapping region in accordance with the linear movement of the pinhole plate.
Each of the drive modules rotates the pinhole plate around a rotation axis of the pinhole plate to position any one of the plurality of through holes in the overlap area. The plurality of through-holes may be formed along the circumferential direction about the rotation axis so as to be selectively located in the overlap area in accordance with the rotation of the pinhole plate.
Here, the plurality of through-holes may be formed in the pinhole plate such that the centers thereof are located within the same radius from the center of the rotation axis.
The plurality of pinhole plates may be arranged such that the centers of the through holes pass through the centers of the overlapping regions as the pinhole plate rotates.
The plurality of pinhole plates may be laminated such that the rotation axis of the pinhole plate is radially centered on the overlapping region.
The through holes may be arranged in order of diameter.
According to another aspect of the present invention, there is provided a radiation imaging apparatus comprising: the variable pinhole collimator; A radiation detector for detecting radiation passing through the pinhole of the variable pinhole collimator; A radiation image processor for imaging the radiation detected by the radiation detector; And a controller for controlling each of the drive modules of the variable pinhole collimator so that the angle of view of the pinhole of the variable pinhole collimator is adjusted so as to be focused on the measurement target emitting the radiation.
Wherein the variable pinhole collimator further comprises a gantry for rotating the radiation detection unit around the measurement object; The control unit may adjust the pinhole of the variable pinhole collimator to focus on the measurement object based on a change in distance between the measurement object and the variable pinhole collimator as the variable pinhole collimator rotates around the measurement object.
The apparatus may further include an interval adjustment module for moving any one of the variable pinhole collimator and the radiation detector so that the interval between the variable pinhole collimator and the radiation detector is adjusted. The control unit may control the interval adjusting module so that the interval between the variable pinhole collimator and the radiation detecting unit is adjusted in synchronization with the angle of view of the pinhole of the variable pinhole collimator.
The measurement object includes a lesion located in the living body; The distance between the object to be measured and the variable pinhole collimator can be changed when the variable pinhole collimator and the radiation detection unit are rotated around the human body according to the position of the living body in the lesion.
The controller may control each drive module of the variable pinhole collimator so that the diameter of the pinhole is adjusted based on the distance between the measurement object and the variable pinhole collimator.
According to another aspect of the present invention, the above object is also achieved by a radioactive sensing apparatus to which the variable pinhole collimator is applied.
According to the present invention, it is possible to change the characteristics of the pinhole collimator such as the angle of view or the hole diameter of a pinhole collimator applied to a radiation imaging apparatus such as a gamma camera or a single photon emission computed tomography apparatus, A variable pinhole collimator which can be implemented with a thickness and a radiation imaging apparatus using the same.
In addition, since the variable pinhole collimator is applied to a single photon emission computed tomography apparatus, it is possible to acquire a shape having a significantly higher resolution than a conventional pinhole collimator when photographing only a region of interest such as a lesion.
By applying the variable pinhole collimator to the single photon emission computed tomography apparatus, even if the distance from the lesion within the living body changes, the image can be photographed at the nearest position to the lesion while focusing on the plane of the lesion. It is possible to minimize the amount of the radiation material.
1 is a view showing a configuration of a conventional gamma camera,
2 is a view for explaining the operation principle of a single photon emission computed tomography apparatus,
3 is a view for explaining the principle of a gamma ray imaging apparatus using a conventional pinhole collimator,
4 is a view showing an example of operation of a single photon emission computed tomography apparatus to which a conventional pinhole collimator is applied,
5 and 6 are views for explaining a configuration of a variable pinhole collimator according to a first embodiment of the present invention,
7 is a view illustrating an example of stacking a pinhole forming module of a variable pinhole collimator according to a first embodiment of the present invention,
8 is a cross-sectional view taken along line VIII-VIII of FIG. 7,
9 is a view for explaining a pinhole forming module of a variable pinhole collimator according to a second embodiment of the present invention,
10 is a view showing a configuration of a radiation imaging apparatus to which a variable pinhole collimator according to the present invention is applied,
11 is a view for explaining an operation example of a radiation imaging apparatus to which a variable pinhole collimator according to the present invention is applied,
12 is a view for explaining an effect of a radiation imaging apparatus to which a variable pinhole collimator according to the present invention is applied,
13 is a view showing an example in which the variable pinhole collimator according to the present invention is applied to a radiation detection apparatus.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The
[First Embodiment]
5 and 6 are views for explaining the configuration of the
5 to 8, the
The plurality of pinhole (PH) collimators are stacked in the incident direction of the radiation to constitute the
Each driving
5 and 7, the
5, the
In the present invention, the
According to the above arrangement, any one of the plurality of through-
8, the hole diameter (l) of the pinhole (PH) to be formed in the through holes (111a, 111a, 111a, 111n) of the pinhole plate (111) The through
Through
At this time, as the difference in diameter between the adjacent through
The through
[Second Embodiment]
Hereinafter, the
The
9, the driving module (not shown) rotates the
The plurality of through
The plurality of through
The plurality of
In the present invention, the
Through the
[Radiographic Imaging Device]
Hereinafter, a radiation imaging apparatus according to the present invention will be described in detail with reference to FIGS. 10 and 11. FIG. Here, in the radiation imaging apparatus according to the present invention, the
As shown in FIG. 10, the radiation imaging apparatus according to the present invention includes a
The
The
The radiation
The
When the radiation imaging apparatus according to the present invention is provided in the form of a single photon emission computerized tomography apparatus, the radiation imaging apparatus includes a
The
The radiation imaging apparatus according to the present invention further includes an
The
Hereinafter, a driving method of a radiation imaging apparatus according to the present invention will be described with reference to FIG. Here, it is assumed that the subject to be photographed by the radiation imaging apparatus according to the present invention is a lesion (L) located in the living body (T). At this time, the
11, a
11, when the
11, when the
On the other hand, when the
11, when the angle of view of the pinhole PH of the
The position and size of the lesion L in the living body T are preset through the
According to the above configuration, measurement can be performed while adjusting the angle of view (?) Of the pinhole (PH) of the variable pinhole collimator (100), so that only the lesion (L) It becomes possible to acquire a higher resolution image for the lesion L. [
In addition, the
This can be confirmed through simulation results as shown in FIG. 12 (a) shows an image obtained by a method shown in FIG. 4 (a) using a fixed pinhole (PH) collimator, and FIG. 12 (b) shows an image obtained by using a fixed pinhole (PH) collimator 11 (c) shows an image obtained by the method as shown in Fig. 11 (b) by using the
In the above-described embodiment, the
More specifically, referring to Fig. 13, as shown in Figs. 13 (a) and 13 (b), the angle of view? Can be broadened as much as possible and only the presence or absence of the radiation source can be grasped. FIG. 13A shows an example in which the
13 (a) and 13 (b), a wide range is screened to obtain a rough position of the source. When the radiation is leaked and radiation is detected at a specific position, As shown in the figure, the angle of view? Is narrowed so as to be focused to the corresponding position, so that the position can be detected more focusedly.
In addition, in the above-described embodiment, the measurement target is defined as a living body (T), and this is defined as a concept including both a human body and an animal.
Although several embodiments of the present invention have been shown and described, those skilled in the art will readily appreciate that many modifications may be made without departing from the spirit or scope of the invention . The scope of the invention will be determined by the appended claims and their equivalents.
100: Variable
111, 211: pinhole plate 112: drive module
111a, 111b, 111c, 111n, 211a, 211b, 211c, 211n:
310: controller 320: radiation detector
330: Spacing module 340: Gantry
350: Radiation image processing unit 360: ROI setting unit
PH: Pinhole PFA: overlap area
Claims (14)
A plurality of pinhole plates each having a plurality of through holes having diameters different from each other formed on each of the plate surfaces, the plurality of pinhole plates being laminated in the direction of incidence of radiation;
And a plurality of drive modules for moving each of the pinhole plates so that one of the plurality of through holes formed in each of the pinhole plates is selectively positioned in the overlapping region to form a pinhole in the overlapping region. Pinhole collimator.
A plurality of the through-holes formed in one pinhole plate are arranged along the longitudinal direction of the pinhole plate;
Wherein the drive module linearly moves the pinhole plate in the longitudinal direction so that any one of the plurality of through holes formed in the pinhole plate is located in the overlapping region.
A plurality of said pinhole plates are radially disposed about said overlapping region;
Wherein the through holes formed in each of the pinhole plates are concentrated in the overlapping region in accordance with the linear movement of the pinhole plate to form the pinhole or to be radially spaced from the overlapping region.
Each of the driving modules rotates the pinhole plate about the rotation axis of the pinhole plate to position any one of the plurality of through holes in the overlapping area;
Wherein the plurality of through-holes are formed along the circumferential direction around the rotation axis so as to be selectively positioned in the overlapping area according to rotation of the pinhole plate.
And the plurality of through-holes are formed in the pinhole plate such that the centers thereof are located within the same radius from the center of the rotation axis.
And a plurality of the pinhole plates are disposed such that centers of the through holes pass through the centers of the overlapping regions in accordance with rotation of the pinhole plate.
And the plurality of pinhole plates are laminated so that the rotation axis of the pinhole plate is radially centered on the overlapping region.
And the through holes are arranged in the order of the diameter of the pinholes.
A variable pinhole collimator according to any one of claims 1 to 8;
A radiation detector for detecting radiation passing through the pinhole of the variable pinhole collimator;
A radiation image processor for imaging the radiation detected by the radiation detector;
And a control unit for controlling each drive module of the variable pinhole collimator so that an angle of view of the pinhole of the variable pinhole collimator is adjusted so as to be focused on a measurement target emitting radiation.
Further comprising a variable pinhole collimator and a gantry for rotating the radiation detection unit around the measurement target;
Wherein the controller adjusts the pinhole of the variable pinhole collimator to focus on the measurement object based on a change in distance between the measurement object and the variable pinhole collimator as the variable pinhole collimator rotates around the measurement object Radiation imaging device.
Further comprising an interval adjustment module for moving any one of the variable pinhole collimator and the radiation detector so that the interval between the variable pinhole collimator and the radiation detector is adjusted;
Wherein the control unit controls the interval adjusting module so that the interval between the variable pinhole collimator and the radiation detecting unit is adjusted in synchronism with the angle of view of the pinhole of the variable pinhole collimator.
The measurement object includes a lesion located in the living body;
Wherein the distance between the object to be measured and the variable pinhole collimator changes when the variable pinhole collimator and the radiation detector rotate around the human body according to a position of the inside of the lesion.
Wherein the control unit controls each drive module of the variable pinhole collimator so that the diameter of the pinhole is adjusted based on a distance between the measurement object and the variable pinhole collimator.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020150061557A KR101684780B1 (en) | 2015-04-30 | 2015-04-30 | Variable pin-hole collimator, radiation imaging device and radiation detecting device using the same |
PCT/KR2015/004527 WO2016175360A1 (en) | 2015-04-30 | 2015-05-07 | Variable pin-hole collimator device, and radiation imaging device and radioactivity detection device using same |
Applications Claiming Priority (1)
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KR1020150061557A KR101684780B1 (en) | 2015-04-30 | 2015-04-30 | Variable pin-hole collimator, radiation imaging device and radiation detecting device using the same |
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KR101684780B1 true KR101684780B1 (en) | 2016-12-08 |
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KR1020150061557A KR101684780B1 (en) | 2015-04-30 | 2015-04-30 | Variable pin-hole collimator, radiation imaging device and radiation detecting device using the same |
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WO (1) | WO2016175360A1 (en) |
Cited By (1)
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KR20230059518A (en) | 2021-10-26 | 2023-05-03 | 한국원자력안전기술원 | Collimator for self-attenuation correction of sample |
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CN114452549B (en) * | 2022-01-17 | 2023-01-24 | 江苏瑞尔医疗科技有限公司 | Collimation system capable of realizing automatic and quick switching |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100647930B1 (en) | 2003-12-26 | 2006-11-23 | 지이 메디컬 시스템즈 글로발 테크놀러지 캄파니 엘엘씨 | Exposure calculation method and radiography system |
KR101364339B1 (en) * | 2013-01-22 | 2014-02-19 | 고려대학교 산학협력단 | Variable pin-hole type collimator and radiation imaging device using the same |
KR101482016B1 (en) | 2013-07-25 | 2015-01-21 | 한국원자력연구원 | Collimator for radiation detector |
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JPH06237927A (en) * | 1993-02-15 | 1994-08-30 | Hitachi Medical Corp | Radiographic device |
DE102007028902B4 (en) * | 2007-06-22 | 2009-04-16 | Siemens Ag | Radiator screen, method for their control and X-ray CT apparatus with such radiator aperture |
US7671340B2 (en) * | 2007-07-16 | 2010-03-02 | General Electric Company | Adjustable-focal-length collimators method and system |
KR101035825B1 (en) * | 2008-12-02 | 2011-05-20 | 주식회사 파나노믹스 | X-ray imaging apparatus interlocking the collimator with the photographing device |
US9318229B2 (en) * | 2012-05-29 | 2016-04-19 | General Electric Company | Collimator plate, collimator module, radiation detecting device, radiography apparatus and assembling method of collimator module |
-
2015
- 2015-04-30 KR KR1020150061557A patent/KR101684780B1/en active IP Right Grant
- 2015-05-07 WO PCT/KR2015/004527 patent/WO2016175360A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100647930B1 (en) | 2003-12-26 | 2006-11-23 | 지이 메디컬 시스템즈 글로발 테크놀러지 캄파니 엘엘씨 | Exposure calculation method and radiography system |
KR101364339B1 (en) * | 2013-01-22 | 2014-02-19 | 고려대학교 산학협력단 | Variable pin-hole type collimator and radiation imaging device using the same |
KR101482016B1 (en) | 2013-07-25 | 2015-01-21 | 한국원자력연구원 | Collimator for radiation detector |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20230059518A (en) | 2021-10-26 | 2023-05-03 | 한국원자력안전기술원 | Collimator for self-attenuation correction of sample |
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WO2016175360A1 (en) | 2016-11-03 |
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