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中文摘要：
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。
英文摘要：
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）.
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