TBI(total body irradiation)のための水補償フィルタの基礎的検討 : 補償材厚さの検討

概要

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We carried out basic studies on compensating material to an obtain uniform dose for the whole body in total body irradiation (TBI) with a 10MV x-ray. Water was used as a water-compensating filter (WCF). We determined experimentally the thickness of the WCF that could eliminate the scattering effect in a phantom and maintain the absorbed dose constant in the phantom. It was found that, when the distance between the WCF and the phantom was more than 250 cm, scattering from the WCF was negligible. In order to keep the absorbed dose constant, the thickness of the WCF had to be changed according to changes in the thickness of the phantom. In general, the absorbed dose in the phantom increased according to field size. For example, when the thickness of the head and pelvis was the same, the absorbed dose of the pelvis was greater. The reason for this was internal scattering with different volumes of the human body. As a result, the compensating thickness of the head was much less than that of the pelvis.
公益社団法人日本放射線技術学会の論文
2000-05-20