ミニファントムを用いたヘッド散乱係数の測定法の評価

概要

論文の詳細を見る
Several new factors that are not listed in JARP have recently been introduced in other countries for the output calculation of radiation treatment. One of these is the head(collimator)scatter factor(sh). Al-though some dosimetries have already been reported for this scatter factor, optimal dosimetry has not been established. Therefore, in this study we evaluated optimal Sh, the in-air output factor, and measurement with the beam central axis, by using mini-phantoms whose size and form differ from build-up caps. In a comparison of the build-up cap and mini-phantom with the chamber axis vertical to the central axis of the beam, the difference resulted in a 1.9% error. However, in the comparison in which the mini-phantom was used with the chamber axis vertical and horizontal to the central axis of the beam, the error was less than 0.5%. As a result, we concluded that the optimal condition was a chamber inserted vertically into a mini-phantom made of acrylic fiber of 3 cmφ.
公益社団法人日本放射線技術学会の論文
2000-09-20