Main part of magnet and electronic circuitry from prototype Nuclear Magnetic Resonance system, early 1970s

This is the magnet and electronic circuit for a prototype Nuclear Magnetic Resonance (NMR) machine used in medicine, commonly called MRI (Magnetic Resonance Imaging). MRI uses NMR signals that build up a picture of the human body by using high frequency radio waves. MRI does not expose the body to radiation or invasive surgery and it can image soft tissues more effectively than X-ray-based methods.