Fitting of Radial Dose Function for 192ir Brachytherapy Sources

Abstract

This article presents an improved configuration for fitting the radial dose functions of sealed 192Ir brachytherapy sources. The proposed functions allow for precise fitting of radial dose function in the range of 0.5 20 cm. The maximum deviations between fitting data and Monte Carlo modeling data do not exceed 0.6%, while average deviations are in the order of 0.1%. The fitting coefficients for the proposed functions are specified for 11 sources from different manufacturers. The proposed functions could be used in treatment planning systems for more accurate calculation of the dose distributions around the sources using a wide range of data according to TG-43 dosimetry protocol.