Development of large-area, reverse-type APD-arrays for high-resolution medical imaging

J. Kataoka*, M. Koizumi, S. Tanaka, H. Ishibashi, T. Nakamori, N. Kawai, H. Ikeda, Y. Ishikawa, N. Kawabata, Y. Matsunaga, S. Kishimoto, H. Kubo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Avalanche photodiodes (APD) offer advantages in terms of weak scintillation detection, fast time response, and magnetic field insensitivity. We have developed new types of large-area, reverse-type APD-arrays specifically designed for high-resolution positron emission tomography (PET). Each device has a monolithic 16 × 16 (or 8 × 8) pixel structure with an active area of 1.0 (or 4.0, 0.25) mm2 for each pixel. An excellent gain uniformity (≤ 10 %) and low dark noise (≤ 0.3 nA) have been achieved, measured at room temperature. Energy resolution of 7.2 % (FWHM) was obtained for the direct detection of 5.9 keV X-rays, while 10.2 % (FWHM) was obtained for 662 keV gamma-rays when coupled with a LYSO scintillator matrix. An excellent time resolution of 102 ps (FWHM) was obtained for a monolithic, 3 mm φ APD pixel. These results suggest that APD-arrays could be a promising device for future applications in nuclear medicine.

Original languageEnglish
Pages (from-to)323-326
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
Publication statusPublished - 2009 Jun 1
Externally publishedYes


  • Avalanche photodiode
  • Scintillation detection
  • γ-rays

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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