{"title":"用于透射型 X 射线管剂量测定的蒙特卡洛统计技术比较。","authors":"Chen-Ju Feng,Chin-Hui Wu,Chin-Hsiung Lin,Shu-Wei Wu,Shih-Yong Luo,Ya-Ru Yang,Chao-Hua Lee,Shao-Chun Tseng,Shen-Hao Lee,Shih-Ming Hsu,Chin-Hui Wu","doi":"10.1088/2057-1976/ad7bbf","DOIUrl":null,"url":null,"abstract":"This study discussed comparing result accuracy and time cost under different tally methods using MCNP6 for a novel transmission X-ray tube which was designed for the Auger electron yield with specific material (eg. iodine). The assessment included photon spectrum, percent depth dose, mass-energy absorption coefficient corresponding to air and water, and figure of merit comparison. The mean energy of in-air phantom was from 41.8 keV (0 mm) to 40.9 keV (100 mm), and the mean energy of in-water phantom was from 41.41 keV (0 mm) to 45.2 keV (100 mm). The specific dose conversion factors based mass-energy absorption coefficient corresponding to different materials was established and the difference was less than 2% for the dose conversion of FMESH comparing to measurement data. FMESH had better figure of merit (FOM) than the F6 tally for the dose parameter assessment, which mean the dose calculation that focused on the superficial region could be assessed with more calculation efficiency by FMESH tally for this novel transmission X-ray tube. The results of this study could help develop treatment planning system (TPS) to quickly obtain the calculated data for phase space data establishment and heterogeneous correction under different physical condition settings.
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引用次数: 0
摘要
本研究讨论了使用 MCNP6 对新型透射 X 射线管进行不同统计方法下的结果准确性和时间成本比较,该 X 射线管是为特定材料(如碘)的奥格电子产率而设计的。评估内容包括光子光谱、深度剂量百分比、与空气和水相对应的质能吸收系数以及优点比较。空气中模型的平均能量为 41.8 keV(0 毫米)至 40.9 keV(100 毫米),水中模型的平均能量为 41.41 keV(0 毫米)至 45.2 keV(100 毫米)。根据不同材料的质能吸收系数确定了具体的剂量换算系数,与测量数据相比,FMESH 的剂量换算系数相差不到 2%。在剂量参数评估方面,FMESH 比 F6 计数值具有更好的优点(FOM),这意味着对于这种新型透射 X 射线管,FMESH 计数值能以更高的计算效率评估侧重于表层区域的剂量计算。本研究的结果有助于开发治疗计划系统(TPS),在不同的物理条件设置下快速获得相空间数据建立和异质校正的计算数据。
Comparison of monte carlo tally techniques for dosimetry in a transmission-type X-ray tube.
This study discussed comparing result accuracy and time cost under different tally methods using MCNP6 for a novel transmission X-ray tube which was designed for the Auger electron yield with specific material (eg. iodine). The assessment included photon spectrum, percent depth dose, mass-energy absorption coefficient corresponding to air and water, and figure of merit comparison. The mean energy of in-air phantom was from 41.8 keV (0 mm) to 40.9 keV (100 mm), and the mean energy of in-water phantom was from 41.41 keV (0 mm) to 45.2 keV (100 mm). The specific dose conversion factors based mass-energy absorption coefficient corresponding to different materials was established and the difference was less than 2% for the dose conversion of FMESH comparing to measurement data. FMESH had better figure of merit (FOM) than the F6 tally for the dose parameter assessment, which mean the dose calculation that focused on the superficial region could be assessed with more calculation efficiency by FMESH tally for this novel transmission X-ray tube. The results of this study could help develop treatment planning system (TPS) to quickly obtain the calculated data for phase space data establishment and heterogeneous correction under different physical condition settings.
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期刊介绍:
BPEX is an inclusive, international, multidisciplinary journal devoted to publishing new research on any application of physics and/or engineering in medicine and/or biology. Characterized by a broad geographical coverage and a fast-track peer-review process, relevant topics include all aspects of biophysics, medical physics and biomedical engineering. Papers that are almost entirely clinical or biological in their focus are not suitable. The journal has an emphasis on publishing interdisciplinary work and bringing research fields together, encompassing experimental, theoretical and computational work.