| 基于Geant4的多相流CT系统优化设计 |
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| 引用本文： | 王化祥,戴鹏,郝魁红,王琦.基于Geant4的多相流CT系统优化设计[J].天津大学学报(自然科学与工程技术版),2008,41(11). |
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| 作者姓名： | 王化祥 戴鹏 郝魁红 王琦 |
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| 作者单位： | 天津大学电气与自动化工程学院，中国民航大学航空自动化学院 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划专项经费资助项目，国家自然科学基金委员与中国民用航空总局联合资助项目 |
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| 摘 要： | 针对多相流CT系统,利用基于蒙特卡洛方法的高能粒子输运仿真软件工具包Geant4分析,构建了多相流CT系统5源、7源和9源仿真模型.分析多相流CT系统的数学模型,并利用LBP、FBP以及ART算法进行了图像重建.基于散射光子比和重建图像质量等优化指标分析,进行了多相流CT成像系统的优化设计.实验表明,优化设计后的CT系统使层流、环流和泡状流的散射光子比分别降低到5.32%、5.33%和5.29%,有效抑制了光子散射,明显改善了再构图像质量.
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| 关 键 词： | 计算机断层扫描 Geant4 传感器阵列 散射光子比 |
Optimum Design of Multiphase CT System Based on Geant4 Software Toolkits |
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| WANG Hua-xiang,DAI Peng,HAO Kui-hong,WANG Qi.Optimum Design of Multiphase CT System Based on Geant4 Software Toolkits[J].Journal of Tianjin University(Science and Technology),2008,41(11). |
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| Authors: | WANG Hua-xiang DAI Peng HAO Kui-hong WANG Qi |
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| Abstract: | A multiphase CT system model was established by using the Geant4 simulating software toolkits which are based on Monte Carlo method.Models with 5,7 and 9 radiation sources were reconstructed.Research was conducted on the mathematical model of CT system,and images were reconstructed with LBP,FBP and ART.Based on the optimum parame-ters,such as SPR(scattering photon rate)and the quality of reconstruction image,the multiphase CT system was optimized.The experimental results show that the optimized CT system can reduce the scattering photon rate to 5.32%,5.33% and 5.29% for laminar flow,annular flow,and bubble flow respectively,restraining the scattering photon effectively and improving the quality of reconstructed image markedly. |
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| Keywords: | computed tomography(CT) Geant4 sensors array scattering photon rate(SPR) |
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