Comparison of Timing Measurement Methods of Dual-Ended Readout Scintillator Array PET Detectors

闪烁体 探测器 物理 对偶(语法数字) 光学 医学物理学 艺术 文学类
作者
Ming Niu,Zhonghua Kuang,Xiaohui Wang,Ning Ren,Ziru Sang,Tao Sun,Zheng Liu,Zhanli Hu,Zheng Gu,Yongfeng Yang
出处
期刊:IEEE transactions on radiation and plasma medical sciences [Institute of Electrical and Electronics Engineers]
卷期号:8 (6): 607-617 被引量:3
标识
DOI:10.1109/trpms.2024.3382990
摘要

The main focus of this work is to compare different timing measurement methods of individual silicon photomultiplier (SiPM) arrays and dual-ended readout PET detectors. Two lutetium yttrium oxyorthosilicate (LYSO) crystal arrays with 3.10×3.10×20 mm3 crystals, enhanced specular reflector (ESR), and barium sulfate (BaSO4) reflector and one LYSO crystal array with 1.88×1.88×20 mm3 crystals and BaSO4 reflector with dual-ended read out by 8×8 SiPM arrays of 3×3 mm2 active pixel area were measured. Signals of the SiPM arrays were processed individually using 64 channel PETsys TOFPET2 ASICs designed for time-of-flight PET applications. For the SiPM arrays, an energy square-weighted average timing method using the timings of the fastest 2 SiPM pixels was found to provide the best coincidence timing resolutions (CTRs). For the dual-ended readout detectors, the method of using the energy-weighted average timings of the two SiPM arrays provided the best CTR of 234 ps for the detector using 3.10×3.10×20 mm3 crystals and ESR reflector, 239 ps for the detector using 3.10×3.10×20 mm3 crystals and BaSO4 reflector, and 275 ps for the detector using 1.88×1.88×20 mm3 crystals and BaSO4 reflector for an energy window of 410-610 keV. The dual-ended readout detectors developed in this work provide better CTRs than those of single-ended readout detectors and a high three-dimensional position resolution which can be used in the future to develop whole-body PET scanners to simultaneously achieve uniform high spatial resolution, high sensitivity and high timing resolution.
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