한국의학물리학회지:의학물리 (Progress in Medical Physics)

  • 제31권4호
  • /
  • Pages.153-162
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  • 2020
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  • 2508-4445(pISSN)
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  • 2508-4453(eISSN)
한국의학물리학회 (Korean Society of Medical Physics)
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Dosimetric Evaluation of an Automatically Converted Radiation Therapy Plan between Radixact Machines

  • Lee, Mi Young (Department of Radiation Oncology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea) ;
  • Kang, Dae Gyu (Department of Radiation Oncology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea) ;
  • Kim, Jin Sung (Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine)
  • 투고 : 2020.09.01
  • 심사 : 2020.12.03
  • 발행 : 2020.12.31
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초록

Purpose: We aim to evaluate the accuracy and effectiveness of an automatically converted radiation therapy plan between Radixact machines by comparing the original plan with the transferred plan. Methods: The study involved a total of 20 patients for each randomly selected treatment site who received radiation treatment with Radixact. We set up the cheese phantom (Gammex RMI, Middleton, WI, USA) with an Exradin A1SL ion chamber (Standard Imaging, Madison, WI, USA) and GAFCHROMIC EBT3 film (International Specialty Products, Wayne, NJ, USA) inserted. We used three methods to evaluate an automatically converted radiation therapy plan using the features of the Plan transfer. First, we evaluated and compared Planning target volume (PTV) coverage (homogeneity index, HI; conformity index, CI) and organs at risk (OAR) dose statistics. Second, we compared the absolute dose using an ion chamber. Lastly, we analyzed gamma passing rates using film. Results: Our results showed that the difference in PTV coverage was 1.72% in HI and 0.17% in CI, and majority of the difference in OAR was within 1% across all sites. The difference (%) in absolute dose values was averaging 0.74%. In addition, the gamma passing rate was 99.64% for 3%/3 mm and 97.08% for 2%/2 mm. Conclusions: The Plan transfer function can be reliably used in appropriate situations.

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참고문헌

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