LaBr3（Ce）晶体阵列γ相机设计  

Design of a Gamma Camera Based on LaBr3（Ce） Scintillator Array

作　　者：石人刚 何元金[2] 陈颖[1] 韦孟伏[1] SHI Ren-gang;HE Yuan-jin;CHEN Ying;WEI Meng-fu(China Academy of Engineering Physics, Mianyang Sichuan 621900, China;Department of Physics, Tsinghua University, Beijing 100084, China)

机构地区：[1]中国工程物理研究院材料研究所,四川绵阳621900 [2]清华大学物理系,北京100084

出　　处：《核电子学与探测技术》2019年第1期22-25,共4页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(11605163)资助

摘　　要：设计了一款基于16×16LaBr3(Ce)晶体阵列耦合H9500型PSPMT的y相机,读出电路采用DPC方案。测试结果表明:DPC电路中心区域定位能力较好,在边缘区域显示出压缩效应;泛场图中心区域约7×8的晶体阵列可清晰地被区分,但边缘区域出现了明显的压缩效应;对于1.1×10^5Bq的137Cs源,经过10min能够观测到源的存在;放置于距离入射窗口77cm的3.7×10^5Bq的152Eu源,相机能够比较准确地判断源的相对方位,但在重建图片中存在伪影。A gamma camera is designed based on a 16×16 LaBr3( Ce) scintillator array coupled to a H9500 PSPMT, in which the readout circuit is a discretized-positioning circuit ( DPC). The test result indicates that DPC circuit has a good positioning ability in the central region but shows a compression effect at the edge. A 7×8 crystal array close to the crystal center can be clearly distinguished, while the reconstructed image of the crystals close to the crystal edge cannot be identified clearly in flood image. For the case of 1.1×1O^5 Bq 137Cs source, it takes about 10 minutes to achieve a relatively clear reconstructed image. The camera can correctly determine the relative orientation of the 3.7×10^5 Bq 152Eu source placed 77 cm away from the collimator surface, but there are some artifacts in the reconstructed image.

关 键 词：Γ相机 LaBr3(Ce) 晶体阵列 PSPMT 实验评估 

分 类 号：TL812.1[核科学技术—核技术及应用]