Abstract
When using Varian AcurosTM to perform inhomogeneity-corrected dose calculation for breast balloon brachytherapy, errors may arise when radiographic contrast is used in the balloon. CT number-to-mass density conversion will probably overestimate the mass density inside the balloon because of the high-Z element in the contrast. In addition, AcurosTM may use an incorrect photon cross section due to incorrect material assignment of the balloon’s contents. In this study, we evaluate the magnitude of these errors in our clinical practice.
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