Organ dose evaluations based on Monte Carlo simulation for CT examinations using tube current modulation
Organ dose evaluations based on Monte Carlo simulation for CT examinations using tube current modulation
复制标题
基于蒙特卡罗模拟的管电流调制 CT 检查器官剂量评估
DOI：
10.1093/rpd/ncw144
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发表时间：
2017
影响因子：
1
通讯作者：
Masahiko Kusumoto
中科院分区：
文献类型：
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作者：
Keisuke Fujii;Keiichi Nomura;Yoshihisa Muramatsu;Satoshi Obara;Keiichi Akahane;Masahiko Kusumoto
本研究的目的是估计管电流值的成人胸部计算机断层扫描（CT）和盆腔CT检查管电流调制（TCM）中使用的每个X射线投影角，并通过与使用体模内剂量测定法测量的剂量进行比较，验证使用蒙特卡罗（MC）模拟确定的器官剂量。对于剂量模拟，通过将CT扫描仪的几何形状、扫描参数（包括估计的TCM曲线和成人拟人化体模的CT图像）输入MC模拟软件获得剂量分布图像。然后根据剂量分布图像确定器官剂量。对于剂量测量，使用位于体模内不同器官位置的放射光致发光玻璃剂量计评价器官剂量。对于胸部和盆腔CT扫描范围内的器官，模拟和测量器官剂量之间的相对差异分别为-2.5至11.0%和-1.5至10.5%。因此，模拟剂量和测量剂量一致。
The aims of this study were to estimate tube current values for each X-ray projection angle used in adult chest computed tomography (CT) and abdomen–pelvis CT examinations with tube current modulation (TCM) and to validate organ doses determined using Monte Carlo (MC) simulations through comparisons with the doses measured using in-phantom dosimetry. For dose simulations, dose distribution images were obtained by inputting the geometry of a CT scanner, scan parameters including estimated TCM curves and CT images of an adult anthropomorphic phantom into MC simulation software. Organ doses were then determined from the dose distribution images. For dose measurements, organ doses were evaluated using radio-photoluminescence glass dosemeters located at various organ positions within the phantom. Relative differences between the simulated and measured organ doses were −2.5 to 11.0% and −1.5 to 10.5% for organs in chest and abdomen–pelvis CT scan ranges, respectively. Thus, the simulated and measured doses agreed well.