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Measurement and Modeling of Out-of-field Doses from Various Advanced Post-mastectomy Radiotherapy Techniques by Jihyung Yoon; David Heins; Xiaodong Zhao; Mary Sanders; Rui Zhang is a Medicine article available to read on EtoBox.

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More and more advanced radiotherapy techniques have been adopted for post-mastectomy radiotherapies (PMRT). Patient dose reconstruction is challenging for these advanced techniques because they increase the low out-of-field dose area while the accuracy of out-of-field dose calculations by current commercial treatment planning systems (TPSs) is poor. We aim to measure and model the out-of-field radiation doses from various advanced PMRT techniques. PMRT treatment plans for an anthropomorphic phantom were generated, including volumetric modulated arc therapy with standard and flattening-filter-free photon beams, mixed beam therapy, 4-field intensity modulated radiation therapy (IMRT), and tomotherapy. We measured doses in the phantom where the TPS calculated doses were lower than 5% of the prescription dose using thermoluminescent dosimeters (TLD). The TLD measurements were corrected by two additional energy correction factors, namely out-of-beam out-of-field (OBOF) correction factor K and in-beam out-of-field (IBOF) correction factor K , which were determined by separate measurements using an ion chamber and TLD. A simple analytical model was developed to predict out-of-field dose a

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Author

Jihyung Yoon; David Heins; Xiaodong Zhao; Mary Sanders; Rui Zhang

Publisher

IOP Publishing

Published

2017

Language

EN

Field

Medicine (Health Sciences)