外部照射における各種線量計算アルゴリズムの評価

概要

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Several approximation methods for photon beam dose calculations have been developed by many researchers. Although the currently used methods of radiation dose calculation are practical, it is recognized that these methods are not accurate enough when 3-dimensional anatomic information of shape and atomic content have to be considered. In this paper, we will briefly review the most commonly used dose calculation algomithms and report the results that evaluated the accuracy of does computations using these algorithms. The accuracy is compared with both calculations and measurements on beam central axis for cobalt-60 gamma-rays and 10MV photon beams for various geometries and field sizes. The equivalent TAR method gives good agreement between measured and calculated dose for heterogeneous three layered phantom configurations irradiated by 10MV photon beams. The power law TAR method is also good for cobalt-60 gamma-rays when the extent of the lung-equivalent material heterogeneity is larger than the area of the beamn. The ratio TAR method which doesn't take into account the scattered radiation is inadequate in heterogeneous medium.
公益社団法人日本放射線技術学会の論文
1990-11-01