한국의학물리학회지:의학물리 (Progress in Medical Physics)

  • 제28권1호
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  • Pages.16-21
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  • 2017
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  • 2508-4445(pISSN)
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  • 2508-4453(eISSN)
한국의학물리학회 (Korean Society of Medical Physics)
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Evaluation of Dual-channel Compound Method for EBT3 Film Dosimetry

  • Kang, Sang-Won (Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea) ;
  • Chung, Jin-Beom (Department of Radiation Oncology, Seoul National University Bundang Hospital) ;
  • Kim, Kyeong-Hyeon (Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea) ;
  • Eom, Keun-Yong (Department of Radiation Oncology, Seoul National University Bundang Hospital) ;
  • Song, Changhoon (Department of Radiation Oncology, Seoul National University Bundang Hospital) ;
  • Lee, Jeong-Woo (Department of Radiation Oncology, Kunkuk University Medical Center) ;
  • Cho, Woong (Department of Radiation Oncology, Seoul Metropolitan Government Seoul National University Boramae Medical Center) ;
  • Suh, Tae Suk (Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea)
  • 투고 : 2017.03.17
  • 심사 : 2017.03.27
  • 발행 : 2017.03.31
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초록

This study assessed the feasibility of a dual-channel (DC) compound method for film dosimetry. The red channel (RC) is usually used to ensure dosimetric quality using a conventional fraction dose because the RC is more accurate at low doses within 3 Gy than is the green channel (GC). However, the RC is prone to rapid degradation of sensitivity at high doses, while degradation of the GC is slow. In this study, the DC compound method combining the RC and GC was explored as a means of providing accurate film dosimetry for high doses. The DC compound method was evaluated at various dose distributions using EBT3 film inserted in a solid-water phantom. Measurements with $10{\times}20cm^2$ radiation field and $60^{\circ}$ dynamic-wedge were done. Dose distributions acquired using the RC and GC were analyzed with root-mean-squares-error (RMSE) and gamma analyses. The DC compound method was used based on the RC after correcting the GC for high doses in the gamma analysis. The RC and GC produced comparatively more accurate RMSE values for low and high doses, respectively. Gamma passing rates with an acceptance criterion of 3%/3 mm revealed that the RC provided rapid reduction in the high dose region, while the GC displayed a gradual decrease. In the whole dose range, the DC compound method had the highest agreement (93%) compared with single channel method using either the RC (80%) or GC (85%). The findings indicate that the use of DC compound method is more appropriate in dosimetric quality assurance for radiotherapy using high doses.

키워드

참고문헌

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  2. Effect of scanning parameters on dose-response of radiochromic films irradiated with photon and electron beams vol.4, pp.10, 2017, https://doi.org/10.1016/j.heliyon.2018.e00864
  3. Investigation of EBT3 Radiochromic Film Response in a High-Dose Range of 6 MV Photon and 6 MeV Electron Beams Using a Three-Color Flatbed Scanner vol.2020, pp.3, 2020, https://doi.org/10.26565/2312-4334-2020-3-02