Design and evaluation of gapless curved scintillator arrays for simultaneous high-resolution and high-sensitivity brain PET

Junwei Du, Xiaowei Bai, Chih Chieh Liu, Jinyi Qi, Simon R. Cherry

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Brain PET scanners that simultaneously provide high-resolution across the field-of-view and high-sensitivity can be constructed using detectors based on SiPM arrays coupled to both ends of scintillator arrays with finely segmented and long detector elements. To reduce the dead space between detector modules and hence improve the sensitivity of PET scanners, crystal arrays with curved surfaces are proposed. In this paper, the performance of a proof-of-concept detector module with nine detector submodules based on SiPMs coupled to both ends of a curved LYSO array with a pitch size of 1.0 × 1.0 mm2 at the front-end and a length of 30 mm was evaluated. A simple signal multiplexing method using the shared-photodetector readout method was evaluated to identify the crystals. The results showed that all the LYSO elements in the detector module of interest could be clearly resolved. The energy resolution, depth-of-interaction resolution, and timing resolution were 14.6% ± 3.6%, 2.77 ± 0.39 mm, and 1.15 ± 0.07 ns, respectively, obtained at a bias voltage of 28.0 V and a temperature of 16.8 °C ± 0.2 °C.

Original languageEnglish (US)
Article number235004
JournalPhysics in medicine and biology
Volume64
Issue number23
DOIs
StatePublished - Nov 26 2019

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Keywords

  • brain PET
  • curved scintillator
  • high-resolution
  • high-sensitivity
  • PET

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

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