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J Korean Soc Ther Radiol > Volume 12(2); 1994 > Article
Journal of the Korean Society for Therapeutic Radiology 1994;12(2): 263-267.
Dosimetry of Irregular Field Using Thermoluminescence Dosimetry
Jong Young Lee, Kyung Ran Park, Kye Jun Kim
Department of Radiation Oncology, Yonsei University Wonju College of medicine, Korea.
In clinical radiotherapy, the use of wide and irregular field techniques frequently results in considerable tumor dose inhomogeneity because of, the variation in physical characteristics of irradiated volumes. This report describes an analysis of the dosimetry of the irregular fields such as radiation fields for Hodgkin's disease(mantle filed), esophageal cancer, and lung cancer when a 6 MV and a 15 MV linear accelerators are utilized. Doses were measured in an Rando phantom using methods of thermoluminescence dosimetry(TDL), and were calculated by radiotherapy planning computer system with the Clarkson's method for calculation of a irregular field. A dose variation of 5-22%, 6-9%, 6-14% were found in the mantle field, esophageal cancer field, lung cancer field respectively. Higher doses occurred in the superior portion of the irregular field. The sites of maximum dose variation were the supraclavicular and the upper spinal cord region. To adjust for these substantial differences, a compensator or a shrinking filed technique should be adopted.
Key Words: Irregular field, Dosimetry, TLD
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