Abstract
Water-based dose calculations, such as those described in AAPM Task Group-43, are commonly used for brachytherapy planning. These methodologies assume uniform applicators. However, the effect of assuming water-equivalence for air within applicator channels may impact dose calculations. The purpose of this work is to quantify the dosimetric impact that a non-water equivalent material, specifically intra-channel air, can have in vaginal HDR cylinder applicators.
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