Design studies of a high resolution PET detector using APD arrays

Y. Shao, R. W. Silverman, R. Farrell, L. Cirignano, R. Graziöse, K. S. Shah, G. Visser, M. Clajus, T. O. Turner, S. R. Cherry

Research output: Contribution to journalArticlepeer-review

95 Scopus citations


We evaluated a compact, high resolution PET detector module using avalanche photodiode (APD) arrays to replace bulky position sensitive PMTs. The newly developed APD array is a planar processed 4×4 array which has a 2×2 mm1 pi×el size with 0.4 mm gaps between pi×els, about 60% quantum efficiency at 420 nm wavelength, and uniform high gain (> 1000) across all channels. A 4×4 array of 2×2×10 mm3 LSO crystals was coupled to an APD array. Different readout electronics and signal multiple×ing schemes were e×plored. All crystals in the detector array were clearly identified in the flood source histogram, with average peak-lo-valley ratios of about 12:1 using a charge sharing resistor network. The energy resolution was measured to be -14% at 511 keV in the detector array. The measured timing resolution was 2.6 ns in coincidence with a LSO/PMT detector. By optimizing the readout electronics currently being used, it is likely that detector performance can be further improved. We have also determined depth-of-interaction (DOI) by reading out two APD arrays connected to the ends of a 2×2×22 mm3 LSO crystal. Preliminary measurements show good DOI measurement capability with DOI positioning uncertainty between 4 and 6.5 mm.

Original languageEnglish (US)
Pages (from-to)1051-1057
Number of pages7
JournalIEEE Transactions on Nuclear Science
Issue number3 PART 3
StatePublished - 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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