Imaging and timing performance of 1 cm x 1 cm position-sensitive solid-state photomultiplier

P. Dokhale, J. Schmall, C. Stapels, J. Christian, Simon R Cherry, M. R. Squillante, K. Shah

Research output: Contribution to journalArticlepeer-review


We have designed and built a large-area 1cm × 1cm position-sensitive solid-state photomultiplier (PS-SSPM) for use in detector design for medical imaging applications. Our new large-area PS-SSPM concept implements resistive network between the micro-pixels, which are photodiodes operated in Geiger mode, called Geiger Photodiodes (GPDs), to provide continuous position sensitivity. Here we present imaging and timing performance of the large-area PS-SSPM for different temperatures and operating biases to find the optimum operating parameters for the device in imaging applications. A detector module was built by coupling a polished 8 × 8 LYSO array, with 1 × 1 × 20 mm3 elements, to a 1 × 1 cm2 PS-SSPM. Flood images recorded at room temperature show good crystal separation as all 64 elements were separated from each other. Cooling the device at 10 °C showed significant improvement. The device optimum bias voltage was ∼ 4.5V over breakdown voltage. The coincidence timing resolution was improved significantly by increasing the operating bias, as well as by lowering the temperature to 0 °C. Results show excellent imaging performance and good timing response with a large-area PS-SSPM device.

Original languageEnglish (US)
Article numberC02033
JournalJournal of Instrumentation
Issue number2
StatePublished - Feb 2013


  • Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA)
  • Gamma detectors (scintillators, CZT, HPG, HgI etc)
  • Photon detectors for UV, visible and IR photons (vacuum) (photomultipliers, HPDs, others)
  • Solid state detectors

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics


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