Open AccessOn light sharing TOF-PET modules with depth of interaction and 157 ps FWHM coincidence time resolution
Author(s) -
M. Pizzichemi,
Andrea Polesel,
Gianluca Stringhini,
S. Gundacker,
P. Lecoq,
S. Tavernier,
M. Pagai,
E. Auffray
Publication year - 2019
Publication title -
physics in medicine and biology/physics in medicine and biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.312
H-Index - 191
eISSN - 1361-6560
pISSN - 0031-9155
DOI - 10.1088/1361-6560/ab2cb0
Subject(s) - lyso , full width at half maximum , silicon photomultiplier , resolution (logic) , scintillator , coincidence , optics , physics , detector , photomultiplier , image resolution , focus (optics) , computer science , artificial intelligence , medicine , alternative medicine , pathology
The performance of a light sharing and recirculation mechanism that allows the extraction of depth of interaction (DOI) are investigated in this paper, with a particular focus on timing. In parallel, a method to optimize the coincidence time resolution (CTR) of PET detectors by use of the DOI information is proposed and tested. For these purposes, a dedicated 64-channels readout setup has been developed with intrinsic timing resolution of 16 ps FWHM. Several PET modules have been produced, based on LYSO:Ce scintillators and commercial silicon photomultiplier (SiPM) arrays, with mm 2 individual SiPM size. The results show the possibility to achieve a timing resolution of 157 ps FWHM, combined with the already demonstrated spatial resolution of 1.5 mm FWHM, DOI resolution of 3 mm FWHM, and energy resolution of 9% FWHM at 511 keV, with 15 mm long crystals of section mm 2 and mm 2 . At the same time, the extraction of the DOI coordinate has been demonstrated not to deteriorate the timing performance of the PET module.