Detector light response modeling for a thick continuous slab detector

Robert S. Miyaoka, Sung Kwan Joo, Kisung Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We investigate a method to improve the position decoding for thick crystal versions (i.e., ≥8 mm) of the continuous miniature crystal element (cMiCE) PET detector by more accurately modeling the detector light response function (LRF). The LRF for continuous detectors varies with the depth of interaction (DOI) of the detected photon. This variation in LRF can result in a positioning error for two-dimensional positioning algorithms. We explore a method to improve positioning performance by deriving two lookup tables, corresponding to the front and back regions of the crystal. The DETECT2000 simulation package was used to investigate the light response characteristics for a 48.8mm by 48.8mm by 10 (8) mm slab of LSO coupled to a 64-channel, flat-panel PMT. The data are then combined to produce the two-dimensional light collection histograms. Light collection histograms that have markedly non-Gaussian distributions are characterized as a combination of two Gaussian functions, where each Gaussian function corresponds to a DOI region of the crystal. The results indicate that modest gains in positioning accuracy are achieved near the central region of the crystal. However, significant improvements in spatial resolution and positioning bias are achieved for the corner section of the detector.

Original languageEnglish
Pages (from-to)634-638
Number of pages5
JournalJournal of Nuclear Science and Technology
Issue number7
Publication statusPublished - 2008 Jul


  • Continuous crystal
  • Continuous slab detector
  • Depth of interaction
  • Light response modeling
  • Positioning algorithm
  • Positron emission tomograph
  • Statistics-based positioning algorithm

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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