TWO OPPOSED?FIELDS IRRADIATION WITH DIFFERENT DOSE-RATIO BY THE HIGH ENERGY X-RAY BEAMS
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The optimization of radiotherapy should mean maximizing the probability of destroying the tumor tissue and minimizing the probability of harming the normal tissue.<BR>If the patient involved both the superficial-and deep-seated tumor is treated with a single-field of high energy X-ray beams (10 MV X-rays or more), the superficial-seated tumor will be received a smaller dose due to the build-up effect. And if the patient is irradiated with two opposed fields, the doses of all the normal and tumor tissue between the two fields will be just the same.<BR>As treatment planning for these patients, we studied to use two opposed fields with different dose-ratio and different MV's of high energy X-rays.<BR>Thirty isodose charts were drawn. Type and energy of radiation : <BR>Linac 6MV and 12MV X-rays. Source-surface distance : 100cm<BR>Field size : 15x15cm<SUP>2</SUP><BR>Field separation : 20cm<BR>Dose-ratio : 1 : 1, 1.5 : 1, 2 : 1, 2.5 : 1, 3 : 1 Phantom : Mix Dp. 30x30x20cm<SUP>3</SUP><BR>It is hoped that the charts will be useful both for references in treatment planning and practice.
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北関東医学会 | 論文
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