Monte Carlo法を用いた体内散乱線の解析 : 密度尺度理論についての考察

概要

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The density scaling theorem, which is based on 3D CT data, is applied to recent calculating algorithms for inhomogeneous correction in radiotherapy treatment planning. Using the Monte Carlo method, we examined the accuracy of the density scaling theorem, when it was used to convert absorbed doses (primary doses and scattered doses) in several kinds of media into doses in water which is basis of the dose calculations. Absorbed doses in media, which effective atomic number is the same as that of water, coincided with doses in water by means of the density scaling theorem with maximum error of 1%. Absorbed doses in compact bone model, which effective atomic number is much larger compared with that of water, deviated from doses in water despite the conversion by the density scaling theorem. However, subjoining the correction for ratio of mass attenuation coefficients of each medium with the density scaling theorem, doses in compact bone model coincided satisfactorily with that in water.
公益社団法人日本放射線技術学会の論文
1988-09-01