ナリヒロ ナオマサ
  成廣 直正
   所属   川崎医療福祉大学  医療技術学部 診療放射線技術学科
   職種   准教授
論文種別 原著
言語種別 英語
査読の有無 査読あり
表題 Oblique Surface Dose Calculation in High Energy X-ray Therapy
掲載誌名 正式名:Acta Medica Okayama
掲載区分国外
巻・号・頁 74(5),415-422頁
著者・共著者 Narihiro Naomasa, Oita Masataka, Yoshihiro Takeda
発行年月 2020/10/20
概要 During radiation therapy, incident radiation oblique to the skin surface is high and may cause severe skin damage. Understanding the dose of radiation absorbed by the skin is important for predicting skin damage due to radiation. In this study, we used a high-energy (4 MV) X-ray system and an optically stimulated luminescence dosimeter (OSLD) that was developed for personal exposure dosimetry. We determined the dose variation and angular dependence, which are the characteristics of a small OSLD required to derive the calculation formula for the oblique surface dose. The dose variation was determined using the coefficient of variation. The maximum coefficient of variation for 66 small-field OSLDs was 1.71%. The angular dependence, obtained from the dose ratio of the dosimeter in the vertical direction, had a maximum value of 1.37. We derived a new equation in which the oblique surface dose can be calculated within the error range of −7.7–5.1%.