ナリヒロ　ナオマサ   Naomasa Narihiro   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),pp.415-422
著者・共著者	Narihiro Naomasa, Oita Masataka, Yoshihiro Takeda
担当区分	筆頭著者
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%.