한국의학물리학회지:의학물리 (Progress in Medical Physics)
- 제16권4호
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- Pages.166-175
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- 2005
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- 2508-4445(pISSN)
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- 2508-4453(eISSN)
입체조형 동적회전조사 방사선치료의 선량 검증
Dosimetric Verification of Dynamic Conformal Arc Radiotherapy
- 김태현 (국립암센터) ;
- 신동호 (국립암센터) ;
- 이두현 (국립암센터) ;
- 박성용 (국립암센터) ;
- 윤명근 (국립암센터) ;
- 신경환 (국립암센터) ;
- 표홍렬 (국립암센터) ;
- 김주영 (국립암센터) ;
- 김대용 (국립암센터) ;
- 조관호 (국립암센터) ;
- 양대식 (고려대학교 의과대학 방사선종양학교실) ;
- 김철용 (고려대학교 의과대학 방사선종양학교실)
- Kim Tae Hyun (Research Institute and Hospital, National Cancer Center) ;
- Shin Dong Ho (Research Institute and Hospital, National Cancer Center) ;
- Lee Doo Hyun (Research Institute and Hospital, National Cancer Center) ;
- Park Sung Yong (Research Institute and Hospital, National Cancer Center) ;
- Yun Myung Guen (Research Institute and Hospital, National Cancer Center) ;
- Shin Kyung Hwan (Research Institute and Hospital, National Cancer Center) ;
- Py Hong Ryull (oResearch Institute and Hospital, National Cancer Center) ;
- Kim Joo-Young (Research Institute and Hospital, National Cancer Center) ;
- Kim Dae Yong (Research Institute and Hospital, National Cancer Center) ;
- Cho Kwan Ho (Research Institute and Hospital, National Cancer Center) ;
- Yang Dae-Sik (Department of Radiation Oncology College of Medicine, Korea University) ;
- Kim Chul-Yong (Department of Radiation Oncology College of Medicine, Korea University)
- 발행 : 2005.12.01
초록
입체조형 동적회전조사 방사선치료(Dynamic Conformal Arc Radiotherapy, DCAR)에서 필름 선량계를 이용한 선량검증시 필름 회전중심점 이동 보정값을 최적화법으로 구하고 최적화 후 DCAR에 대한 선량 검증의 정량적 허용기준을 제시하고자 하였다. 정위방사선치료를 시행했던 7명의 전이성 뇌암 환자에서 DCAR 치료계획을 시행하고 필름 선량계로 선량을 측정하였다. 필름 선량계의 가장 큰 계통적 오차 요인인 회전중심점 이동 보정값을 최적화법으로 구하고 치료계획과 필름으로 측정된 선량분포를 비교하여 최적화 전후의 평균 선량오차와 점선량오차가
The purpose of this study is to develop the optimization method for adjusting the film isocenter shift and to suggest the quantitative acceptable criteria for film dosimetry after optimization In the dynamic conformal arc radiation therapy (DCAR). The DCAR planning was peformed In 7 patients with brain metastasis. Both absolute dosimetry with ion chamber and relative film dosimetry were peformed throughout the DCAR using BrainLab's micro-multileaf collimator. An optimization method for obtaining the global minimum was used to adjust for the error in the film isocenter shift, which is the largest pan of systemic errors. The mean of point dose difference between measured value using ion chamber and calculated value acquired from planning system was