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SCINTILLATION LIGHT DETECTING DEVICE AND RADIATION DETECTING DEVICE

Foreign code F170009017
File No. (S2015-2028-N0)
Posted date Mar 29, 2017
Country WIPO
International application number 2016JP075725
International publication number WO 2017038953
Date of international filing Sep 1, 2016
Date of international publication Mar 9, 2017
Priority data
  • P2015-172498 (Sep 2, 2015) JP
Title SCINTILLATION LIGHT DETECTING DEVICE AND RADIATION DETECTING DEVICE
Abstract The present invention makes it possible to distinguish between signals from a plurality of scintillator elements. This scintillation light detecting device includes: a scintillator array 10 in which are arranged a plurality of scintillator elements having mutually different decay time constants for emitted light generated as a result of an incident radiation event; and a photomultiplier tube 14 which receives light output from the plurality of scintillator elements in the scintillator array, and converts the light into an electrical signal. In relation to the event, an arithmetic processing device 18 detects a peak value in a voltage waveform of the electrical signal from the photomultiplier tube 14, and an integrated charge quantity, and identifies the scintillator element in the scintillator array to which the electrical signal, resulting from the incidence of radiation onto the scintillator element, is attributable, in accordance with the ratio between the detected peak value and the integrated electric charge quantity.
Outline of related art and contending technology BACKGROUND ART
As one of techniques for diagnosing cancer, inspection is PET(Positron Emission Tomography). This PET inspection, a radioactive substance sugar tend to gather in the cancer cells bound to the test agent is administered to the patient. Then, the test agent to cancer cells of radioactive materials are collected in the positron decay occurs, the resulting when positrons annihilate generated a pair of γ-ray (hereinafter, referred to as annihilation γ-ray) detection. In particular, this pair of annihilation γ-ray is, proceeds in the opposite direction at an angle 180. Therefore, the radiation detector disposed on the periphery of the sample at the same time the position of the pair of annihilation γ-ray incident on the detecting, on a straight line connecting the position of the detected because of the presence of a radioactive substance, as measured by repeating this CT(Computed Tomography) by creating the reconstructed image, the position of the cells such as cancer can be identified.
Such PET inspection apparatus, a larger number of detectors surrounding the patient is arranged, which detector pair annihilation γ-ray radiation is incident can be pinpointed. The greater the number of detector of radiation detection efficiency is increased, a larger number of detectors can be arranged in desirable, the number of detectors increases the simultaneous detection of the event processing and cost also increases, the scintillator and the position sensitive photomultiplier tube using inexpensive system is adopted in many cases.
Here, the conventional PET detector, a larger number of detectors around the patient are arranged in a ring shape, (depth direction) towards the patient does not have the resolution for, is difficult to specify the position. Therefore, annihilation γ-ray from an oblique direction with respect to the detector when the positional resolution becomes lower.
As a means for solving this, detector DOI(Depth of Interaction) has been proposed. This DOI detector, a plurality of scintillators arranged in the depth direction, of the emission signal from the scintillator have been made for identifying and, discrimination in the depth direction can be realized. Therefore, annihilation γ-ray from an oblique direction with respect to the position resolution can be increased.
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
  • Inventor
  • ISHIKAWA Masayori
  • OGAWARA Ryo
IPC(International Patent Classification)
Specified countries 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 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 KN KP KR 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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