2017_IGRT course book
MRG-RT: Breast
Background
CTV, PTV margins for APBI:
Brachytherapy (Mammosite, SAVI): Cavity + 1 cm = CTV = PTV EBRT: Cavity + 1-1.5 cm = CTV. CTV + 1 cm = PTV PTV = Cavity + 2-2.5 cm Larger PTV margins needed due to: Setup uncertainty Intra-fraction motion
CTV=Br PTV EBRT PTV
Preferred
Cavity
Alternative
We sought to evaluate MR-IGRT for delivery of APBI given easy localization of cavity on MRI (setup) and ability to monitor intra- fraction motion.
Courtesy of Maria Thomas, MD, PhD
ESTRO IG and Adaptive Course Parikh 02.11.2017
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