Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)
- Volume 16 Issue 2
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- Pages.81-86
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- 1993
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- 2288-3509(pISSN)
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- 2384-1168(eISSN)
Study on Physical Penumbra of Radiation Therapy
방사선치료시 물리학적 반음영의 검토
- Kim, Young-Bum (Dept. of Radiation Therapy, Korea University Medical Center) ;
- Whang, Woong-Ku (Dept. of Radiation Therapy, Korea University Medical Center) ;
- Kim, You-Hyun (Dept. of Radiotechnology, Junior College of Allied Health Science, Korea University)
- Published : 1993.12.30
Abstract
Proper evaluation about the penumbra is very important to improve the efficacy of radiation theraphy. There are two kinds of physical penumbra, geometric penumbra and transmission penumbra. In this study, we evaluated the variation of physical penumbra according to the varing energy level, changing the field size and depth. Physical penumbra width was decreased as the source size decreased, and as the SDD increased, but the consideration about the scatter radiation and mechanical stability is an important factor. For the two adjacent beams, upper collimator should be used and especially for Co-60 unit, it is efficient to use the extended collimator.
Keywords