Monte Carlo calculations of scatter to primary ratios for normalisation of primary and scatter dose.
Monte Carlo calculations of scatter to primary ratios for normalisation of primary and scatter dose.
复制标题
蒙特卡罗计算散射与初级比率，以实现初级和散射剂量的标准化。
DOI：
10.1088/0031-9155/35/3/003
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发表时间：
1990
影响因子：
3.5
通讯作者：
Chin,LM
中科院分区：
文献类型：
--
作者：
Rice,RK;Chin,LM
将总吸收剂量分离为主要成分和散射成分是光子剂量计算中常用的技术。初级剂量分量可以通过测量的窄射束衰减系数和单个归一化值来表征，该归一化值确定在某个参考深度和射野尺寸处初级剂量与总剂量的相对比例。根据测量数据确定该归一化值需要对有限场大小的测量值进行外推以获得零场大小值。作者使用蒙特卡罗模拟对 4、6、10、15 和 24 MV 光子束的初级和散射剂量进行评分，并报告 10 cm* 10 cm 场的圆形当量的最大剂量深度处的散射与初级比率值。这些值的不确定度小于 1%，可用于代替测量数据的外推法来确定各种光子束能量的初级剂量的相对大小。
The separation of total absorbed dose into primary and scatter components is a commonly used technique in photon dose calculations. The primary dose component can be characterised by a measured narrow beam attenuation coefficient and a single normalisation value which establishes the relative proportion of the primary to the total dose at some reference depth and field size. The determination of this normalisation value from measured data requires an extrapolation of measured values for finite field sizes to obtain a zero field size value. The authors have used Monte Carlo simulations to score primary and scatter dose for photon beams of 4, 6, 10, 15 and 24 MV and report values of the scatter to primary ratio at the depth of dose maximum for the circular equivalent of a 10 cm* 10 cm field. These values have an uncertainty of less than 1% and can be used in lieu of extrapolation of measured data to establish the relative magnitude of the primary dose for a wide range of photon beam energies.