Harder D, Mandour M A
Strahlentherapie. 1976 Dec;152(6):509-16.
A new algorithm allowing for the effects of tissue inhomogeneities on dose distributions of high-energy electrons is presented for the purposes of treatment planning computations. Starting from the electron dose distribution for homogeneous tissue the doses contributed by the partial beam hitting the tissue inhomogeneity are substituted by those arising from a partial beam which was alterated by stopping, scattering and changed distances in the inhomogeneity. Since actual data for partial beams of limited cross-section are used and the scatter contributions from the rest of the total beam into and behind the inhomogeneity remain unchanged, good approximation compared to measured values is achieved.
为了进行治疗计划计算，提出了一种新算法，该算法考虑了组织不均匀性对高能电子剂量分布的影响。从均匀组织的电子剂量分布出发，将撞击组织不均匀性的部分射束所贡献的剂量，用因在不均匀性中发生阻止、散射和距离变化而改变的部分射束所产生的剂量来替代。由于使用了有限横截面部分射束的实际数据，并且总射束其余部分进入不均匀性及其后方的散射贡献保持不变，因此与测量值相比可实现良好的近似。
