Magnetic Resonance Imaging–Guided Radiation Therapy: A Short Strengths, Weaknesses, Opportunities, and Threats Analysis

A number of magnetic resonance (MR)-guided radiation therapy devices are under development, and the ViewRay system (ViewRay, Oakwood Village, OH), combining 3 multileaf collimated cobalt sources and 0.3 T MR imaging (MRI) with a split magnet system, has been in clinical use for some time, with a linear accelerator (linac) version announced (1). In contrast, the Elekta (AB, Sweden)/Philips (The Netherlands) Unity device consists of a 7-MV linac that rotates around a closed bore 1.5 T MR imager (2) and is expected to be European conformity marked later this year.

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