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Abstract #4415

Comparison of MRI subsystem performances for two models of MRI-guided radiotherapy: MRI-Cobalt-60 versus MRI-Linac

Olga L Green1, James Flock2, Rajiv Lotey3, Austen N Curcuru1, Sasa Mutic1, and H Michael Gach1

1Radiation Oncology, Washington University in St Louis, St Louis, MO, United States, 2ViewRay, Oakwood Village, OH, United States, 3ViewRay, Mountain View, CA, United States

The era of MRI-guided radiation therapy (MR-IGRT) began in January 2014 when the first patient was treated with 60Co under real-time MRI guidance. In 2017, the first FDA-approved MRI-Linac began treating patients. Both systems incorporate a double donut magnet design with a 28 cm gap for the radiation beam. A rotating gantry carries either three shielded 60Co heads or a 6 MV Linac with magnetic and RF shielding. In this study, we compare the MRI subsystem performance between the two systems.

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