Programmable High Voltage Distribution for Photodetectors in a 1 mm Resolution Clinical PET System

Frances W.Y. Lau, Arne Vandenbroucke, Jung Yeol Yeom, Paul D. Reynolds, David Hsu, Derek Innes, Craig S. Levin

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We present a scalable, cost-effective, and compact high voltage (HV) distribution design for a system that requires many HV channels for photodetector biasing. A digital-to-analog converter (DAC) with a 100 V output range is floated with its reference at -1800 V, providing outputs between - 1800 V and -1700 V. As a consequence, the DAC control and power signals are referenced to - 1800 V. This design was implemented in our 1 mm resolution clinical PET imaging system with detectors comprised of LYSO scintillation crystals coupled to position-sensitive avalanche photodiodes (PSAPDs). The programmable bias voltage outputs have only 20 m Vpp of bias ripple. This design enables all PSAPDs to be biased at their optimal bias voltage, allowing us to achieve a standard deviation of only 2.3% in the energy resolution measured across all 512 PSAPDs in the subsystem.

Original languageEnglish
Article number7147842
Pages (from-to)1989-1994
Number of pages6
JournalIEEE Transactions on Nuclear Science
Issue number5
Publication statusPublished - 2015 Oct 1


  • Avalanche photodiode
  • high-voltage techniques
  • photodetectors
  • positron emission tomography (PET)

ASJC Scopus subject areas

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


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