PMID: 9164116Apr 1, 1997Paper

Comparison of calculated and measured rectal doses in HDR brachytherapy with Ir-192 source

Nihon Igaku Hōshasen Gakkai zasshi. Nippon acta radiologica
Y KakinohanaS Sawada

Abstract

Two orthogonal radiographs are used to reconstruct the three-dimensional positions of applicators (sources) and their dosemeter for assessing afterloading techniques. It has always been assumed that the applicators are perfectly fixed and unchanged during irradiation. In a review comparing measurements by a five-detector dosemeter and calculated doses in our institution, a relatively poor correlation (correlation coefficient = 0.79) was observed. The purpose of this study was to investigate the sources of this difference between calculated and measured rectal doses in HDR brachytherapy with Ir-192 source. In this study, the calculated dose was used as a reference value. The overall percentage difference between calculated and measured rectal doses was estimated at 9%. The major source of the difference between calculated and measured rectal doses was applicators and dosemeter movement during irradiation. This was verified by X-ray fluoroscopy during irradiation. It was found that loose fastening of the applicators caused a change in the position of the applicators and dosemeter during irradiation. By improving the fastening of the applicators and dosemeter, the correlation (correlation coefficient = 0.90) between calculated and...Continue Reading

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