Oblique Surface Dose Calculation in High-Energy X-ray Therapy.

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%. PMID: 33106697 [PubMed - in process]
Source: Acta Med Okayama - Category: Universities & Medical Training Authors: Tags: Acta Med Okayama Source Type: research