Changes in high-dose-rate tandem and ovoid applicator positions during treatment in an unfixed brachytherapy system.


PURPOSE To measure the change in applicator position during treatment in an unfixed high-dose-rate (HDR) brachytherapy system and to evaluate the effect of the shifts on dose calculations. MATERIALS AND METHODS Posttreatment localization radiographs were obtained for 47 HDR treatments (26 tandem and ovoid applicators, 21 ovoids-only applicators). The… (More)