PET探测器波形积分法位置分辨性能测量  

Waveform Integration Method for Measuring Position Resolution of PET Detectors

作　　者：李英帼 黄川 王天泉 范亚明[1] 佟林格 尹永智[1] 李公平[1] LI Ying-guo;HUANG Chuan;WANG Tian-quan;FAN Ya-ming;TONG Lin-ge;YIN Yong-zhi;LI Gong-ping(School of Nuclear Science and T echnology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《核电子学与探测技术》2020年第2期346-352,共7页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(11875156,11765003);甘肃省引导科技创新发展(20182X-07)资助。

摘　　要：利用波形积分法进行信号采集,得出了PET探测器的2-D位置图,并使用分水岭算法计算了查找表。像素尺寸为2.0mm和1.6mm的10×10LYSO以及1.6mm的12×12晶体阵列探测器与光电倍增管直接耦合。基于1GHz采样频率的ADQ同步数据采集卡,采用波形积分法获得了最佳的PET探测器2-D位置图。实验显示,像索为2.0mm.1.6mm的10×10LYSO晶体以及1.6mm的12×12的PET探测器,单个晶体条的位置区分度分别达到0.28mm,0.20mm和0.19mmFWHM,平均峰谷比平均值分别为3.23.4.26和3.46。LYSO阵列晶体PET探测器模块可用于PET整机系统。The waveform integration method is used to acquire the signal.The 2-D position map of the PET detector is obtained,and the look-up table is calculated using the watershed algorithm.A 10×10 LYSO with a pixel size of 2.0 mm and 1.6 mm and a 1.6 mm 12×12 crystal array detector are directly coupled to the photomultiplier tube.Based on the 1 GHz sampling frequency ADQ synchronous data acquisition card,the optimal PET detector 2-D position map was obtained by waveform integration method.Experiments show that 10 × 10 LYSO crystals with 2.0 mm,1.6 mm pixels,and 12×12 PET detectors with 1.6 mm,the positional discrimination of individual crystal strips reaches 0.28 mm,0.20 mm,and 0.19 mm F WHM,the average peak-to-valley ratio is3.23,4.26,and 3.46,respectively.The LYSO array crystal PET detector module can be used in the construction of PET system..

关 键 词：硅酸钇镥LYSO晶体 正电子发射断层成像PET 位置图 晶体查找表 

分 类 号：TL82[核科学技术—核技术及应用]