Build-up Region of Narrow Photon Beams in Linear Accelerator Radiosurgery : Tissue Maximum Ratio Measurements Using Diamond Detector and Microchamber

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  • 直線加速器によるナロー・ビームのビルドアップの変動に関する検討 : ダイヤモンド検出器とマイクロチャンバによる組織-ピーク線量比の測定

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Abstract

Linear accelerator radiosurgery has been used to treat small intracranial lesions. However, when the lesion is superficial, the dose assessment point comes closer to the build-up peak. In this case, the tissue maximum ratio(TMR)is critical in dose assessment, and therefore TMR and build-up peak should be measured accurately for each field. The authors conducted comparative TMR dosimetry of 10 MV x-rays in small circular fields ranging from 6.7 mm to 31.4 mm in diameter at the isocenter using a microchamber and a diamond detector. Both measurements were within 3% of each other at depths ranging from 10 mm to 120 mm. The TMR shift was clearly observed. The position of the build-up peak shifted from 15.0 mm to 27.0 mm with the diamond detector as the field size changed from 6.7 mm to 31.4 mm in diameter.

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