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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。
Based on the Monte Carlo particle transport simulation software package Geant4, a simulation model of low-energy γ-ray multi-phase flow CT system was constructed. By analyzing the optimal parameters such as scattering photon ratio, image correlation coefficient and relative image error, The number of radiation source and the number of detector array elements to optimize the design. Experimental results show that the optimized system has a scattering photon ratio of less than 5%, which significantly improves the signal-to-noise ratio of the detection signal sensitivity.