線量計算のための近似式の検討

概要

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Many papers have been published on the application of the computers for treatment planning in radio-therapy for many years, and the methods for dose calculations have been presented accordingly. It is the purpose of this paper to examine the fitness of the empirical equations for percent depth dose or tissue-air ratio. Three equations were selected among those equations which have been reported for these years, and were compared with the previously published data. The equations were as follows. [numerical formula] The best agreement was obtained in equation (2), and the standard deviations of differences between calculated and tabulated values in the calculation of percentage depth dose and tissue-peak ratio were about 0.3%, and at all of the tabulated data points, those errors were included less than 1.0% of the maximum dose. Equation (1) was simpler and easier than the others to derive the constants, however the standard deviations of differences were about 1.2%. For deriving the constants, equation (3) was tedious and complicated, though the accuracy of fitness was better than equation (1).
社団法人日本放射線技術学会の論文
1979-09-01