Once Dr. Ray Damadian had the idea to create a machine that used nuclear magnetic resonance to capture diagnostic data by scanning a human body, he still had to build it. And though he did, other scientists got credit for inventing the MRI.
Research:

SYMHC Classics: Gustave Courbet
40:51

Behind the Scenes Minis: Oh, Kropotkin!
17:28

Peter Kropotkin's Mutual Aid, Part 2
49:57