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Radiation is delivered from a compact inline S-band 6 MV standing wave linac with side coupled cavities. The flattening filter free linac is designed to deliver 600 cGy/ min. The highlight of the MRIdian  Linac design is the patented magnetic and RF shielding that isolates the workings of a linac and the MRI system from each other. A Linac emits RF energy that may interfere with the MRI image acquisition process and affect MRI image quality. MRIdian Linac uses copper shields enforced with carbon fiber for RF shielding. The combination of the materials reduces RF leakage from the linac to almost zero, ensuring zero impact on the MR image quality. The linac gantry is located in the central gap of the split super conducting magnet. ViewRay has developed specialized magnetic shielding technology consisting of concentric steel shells that create a central magnetic void at the linac components, in the otherwise uniform magnetic field of the MRI.