Electron dose calculation using multiple-scattering theory: evaluation of a new model for inhomogeneities.
Electron dose calculation using multiple-scattering theory: evaluation of a new model for inhomogeneities.
复制标题
使用多重散射理论计算电子剂量：评估新的不均匀性模型。
DOI：
10.1118/1.596756
复制
发表时间：
1992
期刊：
影响因子：
3.8
通讯作者：
Walker,S
中科院分区：
文献类型：
--
作者：
Jette,D;Walker,S
本文是使用多重散射理论计算电子剂量系列文章的第五篇，将研究处理局部不均匀性的新模型的预测（Med. Phys.18, 123–132, 1991）。该模型采用扰动级数的形式，对于厚的半板结构，针对初级电子直接沉积的剂量以及该级数的三个合理截止点，制定了明确的公式。将该模型的预测与 EGS4 蒙特卡罗计算对半板结构的预测进行了比较，发现它们在半板边缘下方的区域相当准确。另一方面，“Hogstrom 算法”是目前常规临床使用中最先进的方法，但人们发现这种配置的准确性较差。
In this article, the fifth in a series on the calculation of electron dose using multiple‐scattering theory, the predictions of a new model for dealing with localized inhomogeneities will be examined (Med. Phys.18, 123–132, 1991). That model is in the form of a perturbation series, and for a thick half‐slab configuration explicit formulas are worked out for the dose directly deposited by the primary electrons, for three reasonable cutoffs of the series. The predictions of this model with EGS4 Monte Carlo calculations for the half‐slab configuration are compared, and they are found to be quite accurate in the region under the edge of the half‐slab. On the other hand, the “Hogstrom algorithm,” which is currently the most advanced method in routine clinical use, is found to give poor accuracy for this configuration.