成廣 直正
   Department     ,
   Position  
Article types 原著
Language English
Peer review Peer reviewed
Title Oblique Surface Dose Calculation in High Energy X-ray Therapy
Journal Formal name:Acta Medica Okayama
Domestic / ForeginForegin
Volume, Issue, Page 74(5),415-422頁
Author and coauthor Narihiro Naomasa, Oita Masataka, Yoshihiro Takeda
Publication date 2020/10/20
Summary 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%.