Development of real time on-line quality assurance device for afterloading HDR brachytherapy

Accurate delivery of dose in HDR Brachytherapy depends on the positioning accuracy of the ¹⁹²Ir source at the proper dwell position inside the applicator. Incorrect implementation of either of these parameters can potentially lead to insufficient tumour control and high dose being delivered to the incorrect treatment volume. Consequently, accurate positioning verification of the HDR source is a fundamental part of quality assurance (QA) procedure. A number of methods have been used to check the positional accuracy like mechanical rulers, autoradiography and video cameras. However, these methods are time consuming for a routine QA program and they cannot furnish information on the actual source locations, So these techniques may not be enough to verify the accuracy of the HDR source position. I have developed a new real time On-line quality assurance device for testing and verification of source positioning and dwell time for HDR Brachytherapy