What is the largest part of an MRI unit, and what field strength does it typically produce?

1. The largest part of an MRI unit is a superconducting magnet. 2. It creates a field typically between 1 and 2 T over a relatively large volume. 3. A large uniform volume is needed because the whole imaged region must sit in a known field. 4. Fields of 10 to 20 T are far above what these instruments run at. 5. The strongest permanent magnets reach only about 2 T and could not cover such a volume uniformly. _Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.11 More Applications of Magnetism_