Monte Carlo model of the scanning beam digital x-ray (SBDX) source.
Monte Carlo model of the scanning beam digital x-ray (SBDX) source.
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DOI：
10.1088/0031-9155/57/22/7381
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发表时间：
2012-11-21
影响因子：
3.5
通讯作者：
Graves EE
中科院分区：
文献类型：
--
作者：
Bazalova M;Weil MD;Wilfley B;Graves EE
扫描束数字X射线（SBDX）系统已开发用于使用反向X射线成像几何结构的荧光成像。SBDX系统由一个大面积X射线源和一个多孔准直器以及一个小型探测器组成。本研究的目的是建立一个蒙特卡罗（MC）模型的SBDX源作为一个有用的工具，优化SBDX成像系统的硬件组件和成像参数。源的MC模型在EGSnrc/BEAMnrc代码中构建，并使用DOSXYZnrc代码和Gafchromic膜测量80、100和120 kV X射线源电压进行验证。MC模拟的深度剂量曲线与测量值在5%以内一致，三个选定深度的射束剖面一般在5%以内一致。还从MC模拟计算了三种电压的曝光率和半值层。对于所有三种X射线源电压，将每单位探测器剂量的患者皮肤剂量量化为患者体型的函数。对于120和80 kV射束，皮肤剂量与探测器剂量的比值范围分别为5-10（20 cm厚患者）和1 × 103-1 × 105（50 cm患者）。使用常见成像参数对前列腺患者的成像剂量进行的模拟显示，每帧的皮肤剂量低至0.2 mGy。
The scanning-beam digital x-ray (SBDX) system has been developed for fluoroscopic imaging using an inverse x-ray imaging geometry. The SBDX system consists of a large-area x-ray source with a multihole collimator and a small detector. The goal of this study was to build a Monte Carlo (MC) model of the SBDX source as a useful tool for optimization of the SBDX imaging system in terms of its hardware components and imaging parameters. The MC model of the source was built in the EGSnrc/BEAMnrc code and validated using the DOSXYZnrc code and Gafchromic film measurements for 80, 100, and 120 kV x-ray source voltages. The MC simulated depth dose curves agreed with measurements to within 5%, and beam profiles at three selected depths generally agreed within 5%. Exposure rates and half-value layers for three voltages were also calculated from the MC simulations. Patient skin-dose per unit detector-dose was quantified as a function of patient size for all three x-ray source voltages. The skin-dose to detector-dose ratio ranged from 5–10 for a 20 cm thick patient to 1 × 103–1 × 105 for a 50 cm patient for the 120 and 80 kV beams, respectively. Simulations of imaging dose for a prostate patient using common imaging parameters revealed that skin-dose per frame was as low as 0.2 mGy.
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影响因子：
3.8
作者：
Bazalova, Magdalena;Graves, Edward E.
通讯作者：
Graves, Edward E.
影响因子：
3.8
作者：
Sutherland, J. G. H.;Rogers, D. W. O.
通讯作者：
Rogers, D. W. O.
影响因子：
3.8
作者：
Ali, E. S. M.;Rogers, D. W. O.
通讯作者：
Rogers, D. W. O.
影响因子：
5.5
作者：
Mahesh, M
通讯作者：
Mahesh, M
影响因子：
4.6
作者：
GRANT, DG
通讯作者：
GRANT, DG