지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국의학물리학회 의학물리 의학물리 제28권 제2호
- 발행연도
- 2017.6
- 수록면
- 54 - 60 (7page)
- DOI
- https://doi.org/10.14316/pmp.2017.28.2.54
이용수
초록· 키워드
오류제보하기
This study was designed to measure transit dose with an electronic portal imaging device (EPID) in eight patients treated with intensity modulated radiotherapy (IMRT), and to verify the accuracy of dose delivery to patients. The calculated dose map of the treatment planning system (TPS) was compared with the EPID based dose measured on the same plane with a gamma index method. The plan for each patient was verified prior to treatment with a diode array (MapCHECK) and portal dose image prediction (PDIP). To simulate possible patient positioning errors during treatment, outcomes were evaluated after an anthropomorphic phantom was displaced 5 and 10 mm in various directions. Based on 3%/3 mm criteria, the mean±SD passing rates of MapCHECK, PDIP (pre-treatment QA) for 47 IMRT were 99.8±0.1%, 99.0±0.7%, and, respectively. Besides, passing rates using transit dosimetry was 90.0±1.5% for the same condition. Setup errors of 5 and 10 mm reduced the mean passing rates by 1.3% and 3.0% (inferior to superior), 2.2% and 4.3% (superior to inferior), 5.9% and 10.9% (left to right), and 8.9% and 16.3% (right to left), respectively. These findings suggest that the transit dose-based IMRT verification method using EPID, in which the transit dose from patients is compared with the dose map calculated from the TPS, may be useful in verifying various errors including setup and/or patient positioning error, inhomogeneity and target motions.
목차
등록된 정보가 없습니다.
참고문헌 (18)
참고문헌 신청
Langer M / 1990 / Large scale opt imizat ion of beam weights under dose-volume restrictions / Int J Radiat Oncol Biol Phys 18:887~893
Langer M / 1987 / Optimization of beam weights under dose-volume restrictions / Int J Radiat Oncol Biol Phys 13:1255~1260
Morrill SM / 1991 / Dose‐volume considerations with linear programming optimization / Med Phys 18:1201~1210
Low DA / 2011 / Dosimetry tools and techniques for imrt / Med Phys 38:1313~1338
Olch AJ / 2002 / Dosimetric performance of an enhanced dose range radiographic film for intensity-modulated radiation therapy quality assurance / Med Phys 29:2159~2168
Langer M / 1987 / Optimization of beam weights under dose-volume restrictions / Int J Radiat Oncol Biol Phys 13:1255~1260
Morrill SM / 1991 / Dose‐volume considerations with linear programming optimization / Med Phys 18:1201~1210
Low DA / 2011 / Dosimetry tools and techniques for imrt / Med Phys 38:1313~1338
Olch AJ / 2002 / Dosimetric performance of an enhanced dose range radiographic film for intensity-modulated radiation therapy quality assurance / Med Phys 29:2159~2168
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