Position sensitive APDs for small animal PET imaging

K. S. Shah, R. Grazioso, R. Farrell, J. Glodo, M. McClish, G. Entine, P. Dokhale, Simon R Cherry

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


In this paper, investigation of position sensitive avalanche photodiodes (PSAPDs) as optical detectors for reading out segmented scintillation arrays of LSO in high resolution PET modules is reported. PSAPDs with 8 × 8 mm 2 and 14 × 14 mm2 area have been characterized with single LSO crystals and arrays. Energy resolution of 19% (FWHM) for 511 keV γ-rays and coincidence timing resolution of ∼3 ns (FWHM) have been recorded with PSAPD coupled to 1 × 1 × 20 mm3 LSO detectors. Flood histogram studies have been successfully conducted by coupling multi-element element LSO arrays (1 mm pixels, 20 mm tall) to the PSAPDs. Finally, depth of interaction (DOI) resolution of <4.5 mm (FWHM) has been measured by coupling two PSAPDs on opposite ends of a 20 mm long LSO crystal with a 1 × 1 mm2 cross section. Based on these results, PSAPDs appear to be promising for high resolution PET. An important advantage of these PSAPDs is significant reduction in electronic readout requirements.

Original languageEnglish (US)
Pages (from-to)91-95
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number1 I
StatePublished - Feb 2004


  • APD
  • LSO
  • PET
  • Position sensitive

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering


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