PET-MR 시스템에 적용을 위한 실리콘 광증배센서의 온도 변화에 따른 성능 열화 분석

An Analysis on Performance Degradation of Silicon Photomultipliers over Temperatures Variation for PET-MR Application

  • 박경진 (한국과학기술원 원자력 및 양자공학과) ;
  • 김형택 (한국과학기술원 원자력 및 양자공학과) ;
  • 임경택 (한국과학기술원 원자력 및 양자공학과) ;
  • 조민식 (한국과학기술원 원자력 및 양자공학과) ;
  • 김기윤 (한국과학기술원 원자력 및 양자공학과) ;
  • 조규성 (한국과학기술원 원자력 및 양자공학과)
  • 투고 : 2015.08.13
  • 심사 : 2015.09.05
  • 발행 : 2015.09.30

초록

A PET-MR system is particularly useful in diagnosing brain diseases. We have developed a prototype positron emission tomography (PET) system which can be inserted into the bore of a whole-body magnetic resonance imaging (MRI) system that enables us to obtain PET and MRI images simultaneously with a reduced cost. Silicon photomultipliers (SiPM) are appropriated as a PET detector at PET/MR system because detectors have a high gain and are insensitive to magnetic fields. Despite of its improved performance compared to that of PMT-based detectors, there is a problem of the photo-peak channel shift which is due to the increase of the temperature inside the ring detector. This problem will occur decreasing sensitivity of the PET and image distortion. In this paper, I quantitative analyze parameters of the KAIST SiPM depending on temperature by experiments. And I designed cooling methods in consideration of the degradation of sensors for correction of the temperature in the PET gantry. According to this research, we expect that distortive images and degradation of the sensitivity will not be occurred with using the above idea to reduce heat even if the PET system operates for a long time.

키워드

과제정보

연구 과제 주관 기관 : National Nanofab Center(NNFC)