TOF-PET探测器定时性能初步研究  

Pilot Study of Timing Performance for Time-of-Flight Positron Emission Tomography Detector

作　　者：刘军辉[1,2,3] 李道武[1,2] 章志明[1,2] 廖燕飞[1,2,3] 黄先超[1,2,3] 王培林[1,2,3] 陈研[1,2,3] 贠明凯[1,2] 丰宝桐[1,2] 帅磊[1,2] 王宝义[1,2] 张天保[1,2] 魏龙[1,2] 

机构地区：[1]中国科学院高能物理研究所核分析技术重点实验室,北京100049 [2]北京市射线成像技术与装备工程技术研究中心,北京100049 [3]中国科学院研究生院,北京100049

出　　处：《原子能科学技术》2011年第12期1522-1526,共5页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(10775149;10805049)

摘　　要：本工作采用LYSO晶体阵列和平板型位置灵敏光电倍增管H8500对TOF-PET探测器进行了初步设计,能分辨3.2mm×3.2mm的晶体阵列。与BaF2探测器组成时间谱仪,测量正电子湮没射线的瞬发时间谱,得到379ps的符合时间分辨率。根据已测量的BaF2探测器时间分辨率(159ps),可计算得到所设计的TOF-PET探测器时间分辨率为344ps。预计与此相同的两个TOF-PET探测器对正电子湮没射线的符合时间分辨率可达486ps左右,为新型PET的研究提供了有利条件。In this work, LYSO scintillators and position sensitive photomultiplier tube （PS PMT） were used to design the TOF-PET detector, and LYSO crystals of 3. 2 mm× 3.2 mm pitch could be distinguished. The coincidence time resolution of 379 ps was measured for the γ rays produced by positron annihilation with a reference detector of BaF2, whose time resolution for 511 keV 7 ray was measured as 159 ps. By subtracting the contribution of the BaF2 detector, 344 ps time resolution could be calculated for thedesigned TOF-PET detector, and 486 ps coincidence time resolution positron annihilation can be expected for two such detectors. It means detector for TOF-PET is feasible. for 7 rays of that the newdetector for TOF-PET is feasible.

关 键 词：正电子发射断层扫描仪 飞行时间 硅酸镥 H8500 

分 类 号：TL812.1[核科学技术—核技术及应用]