Jeong-Eun Park; Kyo-Tae Kim; Won-Hoon Choi; Ho Lee; Sam-Joo Cho; So-Hyun Ahn; Jin-Young Kim; Keum-bae Kim; Hyun-Do Huh; Sung-Kwang Park; Yong-Keun Song

doi:10.14316/pmp.2015.26.4.280

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Park, Kim, Choi, Lee, Cho, Ahn, Kim, Kim, Huh, Park, and Song: Evaluation of Fabricated Semiconductor Sensor for Verification of γ-ray Distribution in Brachytherapy

Original Article

Progress in Medical Physics 2015;26(4):280-285.

Published online: 20 January 2015

DOI: https://doi.org/10.14316/pmp.2015.26.4.280

Evaluation of Fabricated Semiconductor Sensor for Verification of γ-ray Distribution in Brachytherapy

Jeong-Eun Park, Kyo-Tae Kim^†, Won-Hoon Choi^‡, Ho Lee^‡, Sam-Joo Cho^‡, So-Hyun Ahn^‡, Jin-Young Kim^§, Keum-bae Kim^¶, Hyun-Do Huh, Sung-Kwang Park^††, Yong-Keun Song^∥

Department of Radiation Oncology, YeonSei Cancer Center, Seoul, Korea

^†Department of Biomedical Engineering, Inje University, Gimhae, Korea

^‡Department of Radiation Oncology, School of Medicine, Yonsei University, Seoul, Korea

^§Department of Radiation Oncology, Haeundae Back Hospital, Busan, Korea

^∥Division of Heavy Ion Clinical Research, Korea Institute of Radiological and Medical Sciences, Seoul, Korea

^¶Department of Radiation Oncology, Korea Institute of Radiation Oncology and Medical Physics, Seoul, Korea

^∗∗Department of Radiation Oncology, Inha University Hospital, Incheon, Korea

^††Department of Radiation Oncology, Busan Back Hospital, Busan, Korea

Correspondence: Sung-Kwang Park (physicist@paik.ac.kr) Tel: 82-51-890-8749, Fax: 82-51-891-1754 cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.k.ac.kr)

Received 9 December 2015 Revised 24 December 2015 Accepted 25 December 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In radiation therapy fields, a brachytherapy is a treatment that kills lesion of cells by inserting a radioisotope that keeps emitting radiation into the body. We currently verify the consistency of radiation treatment plan and dose distribution through film/screen system (F/S system), provide therapy after checking dose. When we check dose distribution, F/S systems have radiation signal distortion because there is low resolution by penumbra depending on the condition of film developed. In this study, We fabricated a HgI₂ Semiconductor radiation sensor for base study in order that we verify the real dose distribution weather it's same as plans or not in brachytherapy. Also, we attempt to evaluate the feasibility of QA system by utilizing and evaluating the sensor to brachytherapy source. As shown in the result of detected signal with various source-to-detector distance (SDD), we quantitatively verified the real range of treatment which is also equivalent to treatment plans because only the low signal estimated as scatters was measured beyond the range of treatment. And the result of experiment that we access reproducibility on the same condition of γ-ray, we have made sure that the CV (coefficient of variation) is within 1.5 percent so we consider that the HgI₂ sensor is available at QA of brachytherapy based on the result.

Keywords: Digital radiation detector, HgI₂ γ-ray Detector, Brachytherapy, Radiation therapy

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