The Journal of Korean Society for Radiation Therapy (대한방사선치료학회지)

Korean Society for Radiation Therapy (대한방사선치료학회)
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Determination of the Virtual Focus Position for Electron Beam with Air Scanning

전자선에서 Virtual Source Distance의 위치 결정

  • Kwon Kyung Tea (Dept. of Therapeutic Radiology, Asan Medical Center) ;
  • Youn Wha Ryong (Dept. of Therapeutic Radiology, Asan Medical Center) ;
  • Park Kwang Ho (Dept. of Therapeutic Radiology, Asan Medical Center) ;
  • Kim Chung Man (Dept. of Therapeutic Radiology, Asan Medical Center)
  • 권경태 (서울중앙병원 치료방사선과) ;
  • 윤화룡 (서울중앙병원 치료방사선과) ;
  • 박광호 (서울중앙병원 치료방사선과) ;
  • 김정만 (서울중앙병원 치료방사선과)
  • Published : 1994.11.01
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Abstract

Authors have measured virtual source distance of electron beam from CL/1800 medical linear accelerator, with newly designed method. Beam scanning was performed with the direction of beam axis in the air. Compared results between this study and well established in phantom measurement shows good agreement with in experimental error. And we have found that build-up cap plays very important role in air measurement because of charge build up. The method of in-air measurement of virtual source distance is very easy to set-up and generate accurate results.

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