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http://dx.doi.org/10.7742/jksr.2019.13.1.119

A study of Curved Dosimeter for Flattening Filter Free Beam Quality Assurance Evaluation using Curved Dosimeter in Radiotherapy  

Han, Moojae (Department of Radiation Oncology, Collage of Medicine, Inje University)
Shin, Yohan (Department of Radiation Oncology, Collage of Medicine, Inje University)
Jung, Jaehoon (Research for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital)
Heo, Seunguk (Research for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital)
Kim, Kyotae (Korea Institute of Radiological and Medical Sciences)
Heo, Yeji (Department of Medical Imaging Research Institute, Inje university)
Cho, Heunglae (Department of Radiation Oncology, Busan Paik Hospital, Inje University)
Park, Sungkwang (Department of Medical Imaging Research Institute, Inje university)
Publication Information
Journal of the Korean Society of Radiology / v.13, no.1, 2019 , pp. 119-124 More about this Journal
Abstract
Radiation therapy using flattening filter free beam can prevent beam attenuation caused by flattening filter and can improve treatment efficiency. However, accurate dose control is not established for nonuniform iso dose distributions. In this study, curved dosimeter based on photoconductive material $HgI_2$ was fabricated and its reproducibility and linearity were evaluated at 6 MV photon energy to verify its performance. In order to show the usefulness of the curved measurement, the signals measured on the flat substrate and the curved substrate were compared in the flattening filter free beam using the acrylic filter. As a result, the reproducibility of the unit cell dosimeter was evaluated as SE 0.613%, and the linearity was evaluated as R-sq 0.9999. The usability evaluation of the array curve dosimeter demonstrated its usefulness by indicating a curvature error rate of 11.073%p and a reduced error rate.
Keywords
FFF Beam; Quality Assurance; Curve measurement; flatness; Radiotherapy;
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