Abstract
Purpose: The novel application of HDR plesiotherapy for post-mastectomy chestwall boost irradiation offers dosimetric advantages over conventional therapy via electrons due to the skin mould's ability to conform to highly curved and large surface areas while delivering a localized dose to a superficial target. Most brachytherapy dose calculation algorithms compute dose to homogenous water medium following the AAPM Task Group-43 (TG-43) formalism. For HDR plesiotherapy, TG-43-based dose calculation overestimates the coverage to a superficial target by ignoring the loss of backscatter at the target-air interface.
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