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Original Article

Korean Journal of Medical Physics 2015; 26(4): 241-249

Published online December 30, 2015

Copyright © Korean Society of Medical Physics.

Feasibility Study for Development of Transit Dosimetry Based Patient Dose Verification System Using the Glass Dosimeter

Seonghoon Jeong*†, Myonggeun Yoon*, Dong Wook Kim, Weon Kuu Chung, Mijoo Chung, Sang Hyoun Choi

*Department of Bio-convergence Engineering, Korea University, Department of Radiation Oncology, Kyung Hee University at Gang Dong, Department of Radiation Oncology, Korea Institute of Radiological and Medical Sciences, Seoul, Korea

Received: December 1, 2015; Revised: December 18, 2015; Accepted: December 19, 2015

Abstract

As radiation therapy is one of three major cancer treatment methods, many cancer patients get radiation therapy. To exposure as much radiation to cancer while normal tissues near tumor get little radiation, medical physicists make a radiotherapy plan treatment and perform quality assurance before patient treatment. Despite these efforts, unintended medical accidents can occur by some errors. In order to solve the problem, patient internal dose reconstruction methods by measuring transit dose are suggested. As feasibility study for development of patient dose verification system, inverse square law, percentage depth dose and scatter factor are used to calculate dose in the water-equivalent homogeneous phantom. As a calibration results of ionization chamber and glass dosimeter to transit radiation, signals of glass dosimeter are 0.824 times at 6 MV and 0.736 times at 10 MV compared to dose measured by ionization chamber. Average scatter factor is 1.4 and Mayneord F factor was used to apply percentage depth dose data. When we verified the algorithm using the water-equivalent homogeneous phantom, maximum error was 1.65%.

KeywordsRadiation therapy, Patient dose, Glass dosimeter, Transit dose

Korean Society of Medical Physics

Vol.35 No.1
March 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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