A temperature-dependent gain control system for improving the stability of Si-PM-based PET systems

Seiichi Yamamoto, Junkichi Satomi, Tadashi Watabe, Hiroshi Watabe, Yasukazu Kanai, Masao Imaizumi, Eku Shimosegawa, Jun Hatazawa

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The silicon-photomultiplier (Si-PM) is a promising photodetector for the development of new PET systems due to its small size, high gain and relatively low sensitivity to the static magnetic field. One drawback of the Si-PM is that it has significant temperature-dependent gain that poses a problem for the stability of the Si-PM-based PET system. To reduce this problem, we developed and tested a temperature-dependent gain control system for the Si-PM-based PET system. The system consists of a thermometer, analog-to-digital converter, personal computer, digital-to-analog converter and variable gain amplifiers in the weight summing board of the PET system. Temperature characteristics of the Si-PM array are measured and the calculated correction factor is sent to the variable gain amplifier. Without this correction, the temperature-dependent peak channel shifts of the block detector were -55% from 20 °C to 35 °C. With the correction, the peak channel variations were corrected within 8%. The coincidence count rate of the Si-PM-based PET system was measured using a Na-22 point source while monitoring the room temperature. Without the correction, the count rate inversely changed with the room temperature by 10% for 1.5° C temperature changes. With the correction, the count rate variation was reduced to within 3.7%. These results indicate that the developed temperature-dependent gain control system can contribute to improving the stability of Si-PM-based PET systems.

Original languageEnglish
Pages (from-to)2873-2882
Number of pages10
JournalPhysics in medicine and biology
Volume56
Issue number9
DOIs
Publication statusPublished - 2011 May 7
Externally publishedYes

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

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