Performance of a high-resolution depth-encoding PET detector module using linearly-graded SiPM arrays

Junwei Du, Xiaowei Bai, Alberto Gola, Fabio Acerbi, Alessandro Ferri, Claudio Piemonte, Yongfeng Yang, Simon R. Cherry

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


The goal of this study was to exploit the excellent spatial resolution characteristics of a position-sensitive silicon photomultiplier (SiPM) and develop a high-resolution depth-of-interaction (DOI) encoding positron emission tomography (PET) detector module. The detector consists of a 30 × 30 array of 0.445 × 0.445 × 20 mm3 polished LYSO crystals coupled to two 15.5 × 15.5 mm2 linearly-graded SiPM (LG-SiPM) arrays at both ends. The flood histograms show that all the crystals in the LYSO array can be resolved. The energy resolution, the coincidence timing resolution and the DOI resolution were 21.8 ± 5.8%, 1.23 ± 0.10 ns and 3.8 ± 1.2 mm, respectively, at a temperature of -10 C and a bias voltage of 35.0 V. The performance did not degrade significantly for event rates of up to 130 000 counts s-1. This detector represents an attractive option for small-bore PET scanner designs that simultaneously emphasize high spatial resolution and high detection efficiency, important, for example, in preclinical imaging of the rodent brain with neuroreceptor ligands.

Original languageEnglish (US)
Article number035035
JournalPhysics in Medicine and Biology
Issue number3
StatePublished - Feb 1 2018


  • LG-SiPM
  • PET
  • position sensitive SiPMs

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging


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