中文摘要：

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。

英文摘要：

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.