基于Geant4的γ-CT系统优化设计  

Optimum design of γ-CT system based on Geant4 simulation for multiphase flow measurement

作　　者：苏吉[1] 王化祥[1] 薛倩[1] 郝魁红[2] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072 [2]中国民航大学航空自动化学院,天津300300

出　　处：《核技术》2011年第8期575-580,共6页Nuclear Techniques

基　　金：国家自然科学基金重点项目(60532020);国家自然科学基金重大国际合作项目(608220106002);国家自然科学基金委员会与中国民用航空总局联合项目(60672170)

摘　　要：基于蒙特卡罗方法的粒子输运模拟软件包Geant4构建低能γ射线多相流CT系统仿真模型,通过散射光子比、图像相关系数及相对图像误差等优化指标分析,对γ-CT系统的准直器、射线源数及探测器阵列单元数进行优化设计。实验结果表明,优化后系统散射光子比小于5%,明显提高检测信号灵敏度的信噪比。A low-energy multiphase γ-CT system model was designed by using the Geant4 simulation software toolkits. According to scattering photon rate, image correlation coefficient and relative image error, designs of the collimators, the number of radiation sources and the number of detectors were optimized. The γ-CT system has a scattering photon rate of better than 5%, high measurement sensitivity and high signal-to-noise ratio, as confirmed by measurements with different flow patterns （core flow, bubbly flow, annular flow and stratified flow）.

关 键 词：Γ射线 GEANT4 多相流 图像重建 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]