人体胸壁厚度对肺部计数器探测效率的影响研究  

Research on the Efficiency Deviation of Lung Counter Affected by Human Chest Wall Thickness

作　　者：盛伟[1] 成智威[1] 马怀成[1] 徐明[1] 冯天成[1] 张洋[1] 黎先利[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《核电子学与探测技术》2015年第12期1193-1196,共4页Nuclear Electronics & Detection Technology

摘　　要：人体胸壁厚度是影响肺部放射性核素测量准确性的重要参数。基于数字体素模型和MC法,计算得到了不同胸壁厚度条件下,肺部计数器对241Am出射光子的探测效率,进而研究了3组不同人群胸壁厚度差异造成的探测效率偏差。结果显示:胸壁厚度对241Am测量结果的影响严重,出射光子能量越低胸壁厚度影响越大;相较平均胸壁厚度时的探测效率,对于17.6keV光子,偏差可达308.0%,对于59.5keV光子,偏差可达50.0%。Human chest wall thickness （CWT） is a key parameter which will affect the in -vivo lung counting. The lung counter＇s efficiency for the photos emitted by 24, Am under different CWT values is calculated based on the voxel phantom with the help of Monte Carlo method. Then the efficiency deviation caused by the different CWT values of three groups is studied. The result shows that measurement of 241 Am is seriously influenced by CWT and the situation will be worse if the photo energy is lower. The deviation can be as much as 308.0% for the photos of 17.6 keV and 50.0% for the photos of 59.5 keV. So it is essential to measure the real CWT val- ues of the participants while using the lung counter.

关 键 词：肺部计数器 体素模型 MCNP 胸壁厚度 探测效率 

分 类 号：TL86[核科学技术—核技术及应用]