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KMID : 1164219870020010087
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Journal of Korean Society for Radiotherapeutic Technology
1987 Volume.2 No. 1 p.87 ~ p.92
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An Experimental Dosimetry of Irregularly-Shaped-Field Using Therapeutic Planning Computer
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Lee Gui-Won
Kwon Hyoung-Cheol
Yoon Sei-Chul
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Abstract
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The authors have intended to measure intrinsic dose distribution by Farmer dosimeter in irregularly shaped fields such as L, M, T,-shape model in order to determine dose inhomogeneity in those models. We made 2 off-axis points in each model and measured the depth dose at 1.5,5, and 9cm below surface. The results showed dose discrepancy between 2 points. We also measured the depth dose by geometric approximation and computer calculation in those models, and came to the conclusion that computer calculation using Clarkson’s principle is simpler and the measurements are to the ideal data obtained by the experiment in those three models of irregularly shaped fields than those of geometric approximation method.
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KEYWORD
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