I never knew about Ravel's disease.
Thank you for the added information regarding the MRI.
quote:This is what a magnetic resonance imaging machine (MRI) is, a giant electromagnet that produces a report showing differences in magnetic properties, which in turn can tell us where, at any given point in time, the blood is flowing in the body. (The research on the development of the first MRI scanners was performed by the British company EMI, financed in large part from their profits on Beatles records. "I Want to Hold Your Hand" might well have been titled "I Want to Scan Your Brain.")...