Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1825766 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2011 | 5 Pages |
Abstract
Silicon photomultipliers (SiPMs) are receiving increasing attention in the field of positron emission tomography (PET) detectors. Compared to photomultiplier tubes, they offer novel detector configurations for the extraction of depth of interaction (DOI) information, or enable emerging medical imaging modalities such as simultaneous PET-magnetic resonant imaging (MRI). In this article, we used 2Ã2Ã20 mm3 LYSO scintillator crystals coupled to SiPMs on both ends (dual-ended readout configuration) to evaluate the detector performance for DOI-PET applications. We investigated the effect of scintillator crystal surface finishing on sensitivity and resolution of DOI, as well as on energy and timing resolution. Measurements indicate DOI sensitivity and resolution of 7.1% mmâ1 and 2.1±0.6 mm for saw-cut, and 1.3% mmâ1 and 9.0±1.5 mm, for polished scintillator crystals, respectively. Energy resolution varies from 19% when DOI is in the center, to 15% with DOI at either end of the saw-cut crystal, while it remains constant at â¼14% for polished scintillators. Based on our results we conclude that 2Ã2Ã20 mm3 saw-cut (without any special side wall polishing) LYSO crystals coupled to 2Ã2 mm2 silicon photomultipliers are optimal for isotropic 2 mm resolution DOI-PET applications.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
Farhad Taghibakhsh, Alla Reznik, John A. Rowlands,