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