Hybrid radiation therapy and magnetic resonance imaging (MRI) systems are providing new options for cancer therapy. In our design the B0 rotates on a gantry along with the linear accelerator (linac) for treatment delivery. This introduces new challenges to RF-coil design as the plane of MR precession changes depending on gantry angle. Our three channel array is appropriate for the head and consists of two butterfly coils and a circular loop. The array provides equal SNR at all gantry angles while allowing a radiation window to avoid collisions between the radiation beam and the RF-coils.
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