The Journal of Korean Society for Radiation Therapy (대한방사선치료학회지)
- Volume 14 Issue 1
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- Pages.79-84
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- 2002
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- 1598-8449(pISSN)
Calculation of depth dose for irregularly shaped electron fields
부정형 전자선 조사면의 심부선량과 출력비의 계산
- Lee, Byoung-Koo (Department of Radiation Oncology, Korea University Medical Center) ;
- Lee, Sang-Rok (Department of Radiation Oncology, Korea University Medical Center) ;
- Kwon, Young-Ho (Department of Radiation Oncology, Korea University Medical Center)
- Published : 2002.12.01
Abstract
The main cause factor for effective the output, especially in small & irregular shaped field of electron beam therapy, are collimation system, insert block diameter and energy. In the absorption deose of treatment fields, we should consider the lateral build-up ratio (LBR), which the ratio of dose at a point at depth for a given circular field to the dose at the same point for a 'broad-field', for the same incident fluence and profile. The LBR data for a small circular field are used to extract radial spread of the pencil beam,
1.목적 : 작고 불규칙한 모양의 전자선 조사면에서 선원의 출력에 영향을 미치는 요인은 선형가속기의 collimation system, insert block diameter, energy 등이다. 때문에 이러한 조사면의 선량계산으로 LBR을 이용할 수 있는데 LBR(lateral build-up ratio)이란 동일한 incident fluence와 profile에 대해 circular field와 broad field의 선량비로서 나타낼 수 있다. 얻어진 LBR data는 elementary pencil beam 모형을 근거해 깊이와 에너지에 따른 함수(
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