I am a Magnetic Resonance Imager (and CT Scanner) field engineer and the 20Kw amplifier - admitedly narrow band - worked in the 63Mhz frequency for 1.5Tesla. The latest models are solid sate, although due to 'black box technology' I am no longer required to know exactly how. Just change the FRU.
However, 3.0 Tesla magnets are becoming more popular for clinical use and those amps have gone back to thermionic valves - 35Kw at 127Mhz.
Will all that RF cook the patient?
