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GAMMA-RAY IMAGE ACQUISITION DEVICE AND GAMMA-RAY IMAGE ACQUISITION METHOD UPDATE

外国特許コード F180009632
整理番号 5297
掲載日 2018年11月20日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP019936
国際公開番号 WO 2017209059
国際出願日 平成29年5月29日(2017.5.29)
国際公開日 平成29年12月7日(2017.12.7)
優先権データ
  • 特願2016-107780 (2016.5.30) JP
発明の名称 (英語) GAMMA-RAY IMAGE ACQUISITION DEVICE AND GAMMA-RAY IMAGE ACQUISITION METHOD UPDATE
発明の概要(英語) A gamma-ray image acquisition device (1) acquires the direction and energy of subject scattered gamma rays scattered by Compton scattering of incident gamma rays, and acquires the direction and energy of recoil electrons. From this information, the incidence direction and energy of the incident gamma rays are acquired. By imaging spectroscopy based on the incidence direction and energy of a plurality of incident gamma rays, the gamma-ray image acquisition device (1) acquires a two-dimensional image in which each pixel corresponding to an incidence direction includes energy distribution information. In the two-dimensional image, the surface area thereof and the solid angle of the imaging range are proportional. A gamma ray intensity distribution can thereby be acquired without distance dependence, and an image indicating more useful information than that of the prior art can be obtained.
従来技術、競合技術の概要(英語) BACKGROUND ART
Conventionally, gamma radiation distribution in a two-dimensional or three-dimensional image taken as a technique, such as cosmic rays in the field of observation and medical research. Several hundred keV to several MeV as one method of detecting gamma rays, and gamma of the Compton scattering is used. Compton scattering, the gamma ray is incident on the material, the release of recoil electrons from the material, the incident gamma ray and gamma ray is scattered. Using the Compton scatter of gamma rays in order to improve the detection accuracy, the scattered gamma rays and recoil electron energy and direction of each of the detected direction of the incident gamma rays has been developed technology for acquiring. In the image capture device such as a gamma ray, an electronic track detection type (Electron-Tracking Compton Camera compton camera, hereinafter, referred to as' ETCC '.) Is called.
T. Tanimori et al., "An Electron-Tracking Compton Telescope for a Survey of the Deep Universe by MeV gamma-rays", Astrophysical Journal, The American Astronomical Society, 26 August 2015, the first winding 810, the first signal 1, 28 (hereinafter, 'Document 1' is called.) Is, in observation by the cosmic rays ETCC, a variety of improvements over the technique for removing the background radiation can be efficiently reported. In addition, Document 1 is, in the improved performance ETCC, the point spread function in the same manner as a conventional optical telescope (Point Spread Function, hereinafter, referred to as' PSF '.) Is defined, the resolution is quantitatively discussed.
Tomono large, the outer 17 name, "an electronic track detection type compton camera (V) environment using the gamma-ray imaging", online, 28 September 2015 Vol. of the present invention, the search 14 April 2016, the Internet ' URL: http: //www-cr.scphys.kyoto-u.ac.jp/research/MeV-gamma/Presentation/2015/JPS2015A _ tomono20150915v5.pdf) is, the image gamma using ETCC environment has been proposed a technique. Japanese Patent Laid-Open Patent Publication 2015-148448, Japanese Patent Application JP-2015-224986 and JP-2015-190965 Publication is, in the track of the recoil electrons ETCC detection accuracy has been disclosed a technique for improving.
On the other hand, in the medical field, positron emission tomography (Positron Emission Tomography, hereinafter, 'PET' is called.) And single photon emission computed tomography (Single Photon Emission Computed Tomography, hereinafter, referred to as' SPECT '.) In, an image of a lesion using the gamma radiation has been performed.
Incidentally, conventionally, in order to make the image of the distribution of gamma rays, radiation noise generated by the background removal apparatus for removal of the study has been performed. Therefore, the information obtained in order to obtain more useful information of the image has not been investigated. Also, in PET, on the principle of the detection, there is a limit to the reduction of noise.
The present invention, the gamma ray Compton scattering is directed to the image capturing apparatus. Gamma-ray image acquisition device, and the chamber, the chamber from the outside of the incident gamma ray Compton scattering of gamma rays scattered by the object, the object acquires the detected position and energy of the scattered gamma rays scattered gamma ray detection unit, the incident gamma ray scattering in the chamber to the position information obtaining unit and obtaining the position of the scattering, the scattering position based on the detected position and direction of the scattered gamma ray scattering to obtain the object in the direction obtaining unit, the scattering from the direction of the recoil electron of energy and recoil electron information acquisition unit acquires, in the direction of the scattered gamma ray energy and the object, as well as, the direction of the recoil electron energy and, in the direction of incidence of gamma rays incident on the incident gamma ray and a calculating unit that obtains energy and, a plurality of incident gamma ray imaging spectroscopy based on the incident direction and energy of the, the incident direction of the incident gamma ray energy corresponding to each pixel of the two-dimensional distribution information acquired by the image acquisition unit and a image.
In the two-dimensional images, three-dimensional imaging range of the area is proportional to the angle, the incident gamma-ray incident direction obtained by the calculation unit the precision of the point spread functions of the full width at half maximum, 15 corresponding to the visual angle or less.
In the two-dimensional image, the area and the imaging range of the solid angle is proportional to, gamma rays from the information obtained by the image acquiring apparatus, an image representing useful information than the conventional one can be obtained.
Of one preferred embodiment, the image acquiring unit, among the plurality of incident rays, the radiation source from directly entering the incident gamma rays into the chamber, and, the gamma rays directly incident on the scattering energy lower than the range of incident gamma rays, gamma rays and at least one of the specific, wherein at least one of the direction of incidence of gamma rays to obtain a two-dimensional image distribution.
The image capture device according to another embodiment of gamma rays, and the chamber, the chamber from the outside of the incident gamma ray Compton scattering of gamma rays scattered by the object, the object acquires the detected position and energy of the scattered gamma rays scattered gamma ray detection unit, the incident gamma ray scattering in the chamber to the position information obtaining unit and obtaining the position of the scattering, the scattering position of the object based on the detected position and direction of the scattered gamma ray scattering direction acquiring unit and acquires the, the scattering from the direction of the recoil electron of energy and recoil electron information acquisition unit acquires, in the direction of the scattered gamma ray energy and the object, as well as, the direction of the recoil electron energy and, in the direction of incidence of gamma rays incident on the incident gamma ray and a calculating unit that acquires and energy, among the plurality of incident rays, gamma rays 1 incident on the first energy range of the first 1, and, the first 2 1 is different from the first energy range of the incident gamma ray energy range of 2 to identify the first, the second three-dimensional information of incident gamma 1 gamma 1 gamma-ray image is acquired in the first field, the first three-dimensional information of incident gamma 2 gamma 2 gamma obtained in the first field image and a image acquisition unit.
The incident direction of the incident gamma calculating unit obtained by the precision of the point spread functions of the full width at half maximum, 15 corresponding to the visual angle or less.
Of the incident gamma ray energy range of the first 1 1, and, 1 is different from the first and the second energy range of the incident gamma ray energy range of 2 2 by identifying, from the information obtained by the gamma-ray image acquisition device, a first useful information to the image gamma 1 gamma 2 and the second image can be obtained.
In the preferred embodiment, the first incident gamma-rays 1, directly from the radiation source is directly incident to the chamber and incident on the gamma, gamma 2 is the first incident, the incident gamma ray energy range is lower than the direct energy in the range of incident gamma ray is scattered.
In a preferred example, the incident gamma-rays, radioactive material emitted from the object. In a further preferred embodiment, the object may be, the positron gamma radiation or drug has been administered to a human body.
Another preferred embodiment, gamma-ray image acquisition device, the object prepared in advance in the storage unit and the electron density distribution, the first image to the gamma 1, gamma 2 and the first image using the electron density distribution further comprises a correction unit.
Yet another preferred embodiment, gamma-ray image acquisition device, the first smoothing the image gamma 1, gamma 1 and the first smoothed image and the second object from the image gamma 2 of the electron density distribution obtained in the electron density distribution further comprises obtaining unit.
Preferably, the gamma ray image acquisition device, similar to that of the chamber further comprises a mounting portion of the additional chamber.
Further according to another embodiment of a gamma ray image acquisition device, in the object including a material that emits a positron emission tomography, positron pair annihilation of electrons generated by incident gamma rays incident on the part of gamma as the chamber, the chamber in the incident gamma ray Compton scattering of gamma rays scattered by the object, the object acquires the detected position and energy of the scattered gamma rays scattered gamma ray detection unit, the scattering of the incident gamma rays in a vacuum chamber and the scattering position information acquisition unit acquires a time scattering, the scattering position and the object based on the detected position of the scattered gamma ray scattering to the subject direction of the scattering direction acquiring unit and acquires, from the scattering position in the direction of the recoil electron energy and recoil electron information acquisition unit acquires, in the direction of the scattered gamma ray energy and the object, as well as, the direction of the recoil electron energy and, in the direction of incidence of gamma rays incident on the incident gamma ray and a calculating unit that obtains energy and, which is the product of the object disposed on the opposite side of the chamber, the detection of gamma rays incident from the object position and the detection time is obtained in the counter and the detection unit, the direction of incidence of gamma rays is incident to the chamber, energy, scattering and the scattering time on the basis of the position, the opposite of the gamma rays detected by the detection unit, the incident gamma ray pair generation of the gamma ray detected and the position detection time and identify those having a particular gamma, the gamma gamma specified by the specifying unit on the position and scattering in the scattering time within the chamber, as well as, the gamma of the other of the opposing detection unit based on the detection time and the detection position, within the subject of the acquired gamma gamma generation position of the occurrence position obtaining unit, a plurality of gamma generation position of the three-dimensional image is acquired as an image acquisition part.
The incident direction of the incident gamma calculating unit obtained by the precision of the point spread functions of the full width at half maximum, 15 corresponding to the visual angle or less.
By the opposing detection unit is provided, the generation position of the gamma can be obtained with high accuracy at low cost.
Preferably, the counter detection unit, the lead-containing plastic or lead containing glass scintillator.
In the preferred embodiment, gamma-ray image acquisition device, similar to the chamber and another chamber, as in the case of the chamber, the chamber of the other gamma ray be incident on the scattering of the counter information and information of the incident gamma ray detection unit, configured to obtain the occurrence position of the gamma further provided. From the chamber in the direction said object, said object from the other chamber and a direction of an angle, greater than or equal to 0 or less than 140.
The present invention, the image acquiring method to acquire an image of the gamma rays are directed.
The above object and other objects, features, aspects and advantages will be, with reference to the accompanying drawings of the present invention performed the following detailed description of the reveal.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • KYOTO UNIVERSITY
  • 発明者(英語)
  • Tatsutairi Tanimori
  • Atsushi Takada
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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