Mark Rivard
Department of Radiation Oncology, Tufts University School of Medicine, Boston, Massachusetts, United States of America

With the recent introduction of heterogeneity-correction algorithms for brachytherapy, the community is still unclear on how to commission and implement these into clinical practice. The recently-published Task Group 186 (TG-186) provided guidance to early adopters of model-based dose calculation algorithms (MBDCAs) for brachytherapy dose calculations to ensure practice uniformity. This report represented recommendations by the American Association of Physicists in Medicine (AAPM), the Groupe Européen de Curiethérapie-European Society for Radiotherapy & Oncology (GEC-ESTRO), the American Brachytherapy Society (ABS), and the Australasian Brachytherapy Group (ABG). Extending this project, a working group has been formed by the AAPM/GEC-ESTRO/ABG to develop a set of well-defined test case plans to benchmark brachytherapy treatment planning systems using MBDCAs to support their commissioning by clinical end-users. To date, four test case plans have been developed for two high-dose-rate 192Ir treatment planning systems with work underway to develop clinical test cases and explore low-energy electronic brachytherapy sources and planning systems. Further, the test cases and a User’s Guide have been posted on the Brachytherapy Source Registry maintained by the AAPM and the IROC Houston QA Center. This Registry is available worldwide and provides access to a users’ forum for sharing experience and giving recent information and updates.

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