Radiation Oncology Journal
- Volume 5 Issue 2
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- Pages.157-163
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- 1987
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- 2234-1900(pISSN)
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- 2234-3156(eISSN)
Variation of Effective SSD According to Electron Energies and Irradiated Field Sizes
전자선 에너지 및 조사야에 따른 유효선원 피부 간 거리 변화
- Yang, Chil-Yong (Department of Radiation Oncology and Physics, Kosin Medical College and Medical Center) ;
- Yum, Ha-Yong (Department of Radiation Oncology and Physics, Kosin Medical College and Medical Center) ;
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Jung, Tae-Sik
(Department of Radiation Oncology and Physics, Kosin Medical College and Medical Center)
- Published : 1987.12.01
Abstract
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