伽马光子作用深度探测方法研究

项目名称： 伽马光子作用深度探测方法研究

项目编号： No.11205108

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学II

项目作者： 周荣

作者单位： 四川大学

项目金额： 30万元

中文摘要： 传统应用于核医学成像的γ光子探测方法只能给出γ光子的二维位置坐标，不能输出γ光子在探测器内作用深度信息。这在光子斜射的情况下会造成定位错误，引起成像质量下降。国际上，特别是正电子发射断层成像相关研究组近年来致力于发展针对γ光子作用深度的探测方法，给出离散或连续的γ光子作用深度信息。本项目提出研究基于光响应函数和晶体分光技术相结合的γ光子作用深度探测方法，这种方法利用特殊的晶体分光设计造成晶体后端面闪烁光分布随其发出位置不同而产生的明显差异，通过仅测量晶体后端面闪烁光分布再由统计算法估计闪烁光源位置，从而达到探测γ光子作用深度的目的。由于这种探测方法不增加光输出及后续电子学读出通道，且可以给出连续的作用深度信息，将成为γ成像特别是PET成像技术改进的方向。因此，本项目研究的开展将具有重要的科学意义，且暗藏着巨大的应用前景。

中文关键词： 伽马光子；作用深度；光响应函数；正电子发射断层成像；

英文摘要： Conventional detecting methods used in nuclear medicine imaging can only give the 2-D location of the γ photons, while the depth of interaction (DOI) of γ photons cannot be identified. If the incident γ rays were not perpendicular to the surface of the crystal, wrong localizations might be made by the detector, which was bad for getting high quality images. Many research groups, especially those interested in PET imaging, do many efforts to develop a detecting method which can identify the DOI of the γ photons, either discretely or continuously. This proposal suggest a research on detecting DOI based on light response function (LRF) and crystal light share, which identify the DOI using statistic algorithm according to the scintillator photon distribution on the back end of the crystal, for the scintillator photon distribution varies obviously with the DOI. Because no extra photon-electric elements and no extra electronic channels were used, and DOI could be continuously identified, this method is expected to be the new improvement point of PET imaging technology. Therefore, this proposal has a scientific significance, and it also could be expected to be used widely in the future.

英文关键词： gamma photons；DOI；LRF；PET；