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A Study on the Dose Changes Depending on the Shielding Block Type of Irradiation During Electron Beam Theraphy  

Lee, Sun-Yeb (Department of Radiological Science, HALLYM COLLEGE)
Park, Cheol-Soo (Department of Radiological Science, HALLYM COLLEGE)
Lee, Jae-Seung (Department of Physics, Soonchunhyang University)
Goo, Eun-Hoe (Department of Physics, Soonchunhyang University)
Cho, Jae-Hwan (Department of Radiological Science, Gyeonesan University College)
Kim, Eng-Chan (Department of Physics, Yeungam University)
Moon, Soo-Ho (Department of Physics, Yeungam University)
Kim, Jin-Soo (Department of Radiation Oncology, Boondang CHA Hospital)
Park, Cheol-Woo (Department of Radiological Science, Dong-Eui Science College)
Dong, Kyung-Rae (Department of Radiological Science, Gwangju Health College)
Kweon, Dae-Cheol (Department of Radiological Science, Shinheung College)
Publication Information
Journal of radiological science and technology / v.33, no.3, 2010 , pp. 253-260 More about this Journal
Abstract
The primary focus of this study was to explore the variation in dose distributions of electron beams between different types of construction structure of cut-out blocks embodied in electron cones, given that the structure is considered one of the causes of multiple scattered radiation from electrons which may affect dose distributions. For evaluation, two types of cut-out blocks, divergency and straight, manufactured for this study, were compared in terms of area of interval in distribution of dose, and flatness and symmetric state of surface being radiated. The results showed that divergency cut-out blocks reduced the lateral scattering effects on the thickness of cut-out blocks more substantially than straight ones, leading to more uniform dose distribution at baseline depth. Notably in divergency cut-out blocks, the high dose area decreased more significantly, and more uniform dose distribution was observed at the edge of the irradiated field. This points to a need to consider the characteristics of dose distribution of electron beams when setting up radiotherapy planing at the venues. Therefore, this study is significant as an exploratory work for ensuring high accuracy in dose delivery for patients.
Keywords
multiple scattering; cut-out block in electron cones; dose distribution; flatness of irradiated field; symmetric state of irradiated field;
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