Radiation Oncology Journal
- 제1권1호
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- Pages.41-45
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- 1983
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- 2234-1900(pISSN)
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- 2234-3156(eISSN)
흉곽(胸廓)의 전자선(電子線) 조사시(照射時) 선량분포(線量分布)에 관(關)한 연구(硏究)
A Study on Electron Beam Dosimetry for Chest Wall Irradiation
- 강위생 (서울대학교 의과대학 방사선과학교실) ;
- 고경환 (서울대학교 의과대학 방사선과학교실) ;
- 하성환 (서울대학교 의과대학 방사선과학교실) ;
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박찬일
(서울대학교 의과대학 방사선과학교실)
- Kang, Wee Saing (Department of Radiology, College of Medicine, Seoul National University) ;
- Koh, Kyoung Hwan (Department of Radiology, College of Medicine, Seoul National University) ;
- Ha, Sung Whan (Department of Radiology, College of Medicine, Seoul National University) ;
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Park, Charn Il
(Department of Radiology, College of Medicine, Seoul National University)
- 발행 : 1983.10.30
초록
To obtain 7 MeV electron beam which is suitable for treatment of the chest wall after radical of modified radical mastectomy, the authors reduced the energy of electron beam by means by Lucite plate inserted in the beam. To determine the proper thickness of the Lucite plate necessary to reduce the energy of 9 MeV electron beam to 6 MeV, dosimetry was made by using a parallel plate ionization chamber in polystyrene phantom. Separation between two adjacent fields, 7 MeV for chest wall and 12 MeV for internal mammary region, was studied by means of film dosimetry in both polytyrene phantom and Humanoid phantom. The results were as follows. 1. The average energy of 9 MeV electron beam transmitted through the Lucite plate was reduced. Reduction was proportional to the thickness of the Lucite plate in the rate of 1.7 MeV/cm. 2. The proper thickness of the Lucite plate necessary to obtain 6 MeV electron beam from 9 MeV was 1.2 cm. 3. 7 MeV electron beam, 80% dose at 2cm depth, is adequate for treatment of the chest wall. 4. Proper separation between two adjacent electron fields, 7 MeV and 12 MeV, was 5mm on both flat surface and sloping surface to produce uniform dose distribution.
키워드