학술논문
전자선 에너지 및 조사야에 따른 유효선원 피부 간 거리 변화
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- 영문명
- Variation of Effective SSD According to Electron Energies and lrradiated Field Sizes
- 발행기관
- 대한방사선종양학회
- 저자명
- 양칠용(Chil Yong Yang) 염하용(Ha Yong Yum,) 정태식(Tae Sik Jung)
- 간행물 정보
- 『대한방사선종양학회지』제5권 제2호, 157~163쪽, 전체 7쪽
- 주제분류
- 의약학 > 종양학
- 파일형태
- 발행일자
- 1987.12.30
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국문 초록
영문 초록
It is known that fixed source to skin distance (SSD) cannot be used when the treatment field is sloped or larger than the size of second collimator in electron beam irradiation and inverse square law using effective ssd should be adopted. Effective SSDs were measured in different field sizes in each 6, 9, 12, 15 and 18MeV electron energy by suing NELAC 1018D linear accelerator of Kosin Medical Center.
We found important parmeters of effective SSD.
1. Minimum effective SSD was 58.8cm in small field size of 6X6cm and maximum effective SSD was 94.9cm in large field size of 25X25cm, with 6MeV energy. It's difference was 36.1cm. The dose rate at measuring point was quite different even with a small difference of SSD in small field (6X6cm) and low energy (6 MeV).
2. Effective SSD increased with field size in same electron energy.
3. Effective SSDs gradually increased with the electron energies and reached maximum at 12 or 15 MeV electron energy and decreased again at 18MeV electron energy in each identical field size. And so the effective SSD should be measured in each energy and field size for practical radiotherapy.
목차
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