摘要
研究一种基于连续闪烁晶体配合位置灵敏光电倍增管(PSPMT)设计高分辨率小型伽玛相机模块的新方案。采用蒙特卡罗方法研究了压缩效应及内在空间分辨率与晶体参数的关系,进一步改进PSPMT的读出电路与定位方法,开发基于局域重心法的读出电子学电路,最后进行了成像实验测试。结果表明,基于局域重心法的读出电子学电路能够有效抑制晶体的压缩效应,晶体的空间分辨率和压缩效应都随着晶体厚度的减少而得到改善。因此,这种设计方案是可行的,其内在空间分辨率能够达到1?2mm,比采用晶体阵列有更好的性价比。
This work is aimed at developing a compact gamma camera module of high spatial resolution, based on block scintillation crystal coupling with position sensitive photomultiplier （PSPMT）. Monte Carlo simulation was used to study the shrinkage effect and intrinsic spatial resolution of miniature gamma camera module with crystal parameters. The readout electronics and the position determination method of the PSPMT were improved by using a novel truncated center-of-gravity method. Imaging experiments were performed to evaluate our design. The results demonstrate that readout circuit with truncated center-of-gravity （TCOG） can restrict the shrinkage effect; the spatial resolution and shrinkage effect of crystal are improved with reduced thickness and increased light output. It can be concluded that a crystal wafer coupled to PSPMT will have 1-2 mm intrinsic resolution, hence a high cost-effective solution compared to crystal array design.
出处
《核技术》
CAS
CSCD
北大核心
2010年第1期54-58,共5页
Nuclear Techniques
基金
国家自然科学基金(30570520)资助
关键词
高分辨率小型伽玛相机模块
蒙特卡罗模拟
局域重心法
High resolution miniature gamma camera module
Monte Carlo simulation
Truncated center-of-gravity method
