In 2000, Knutson published the first paper using magnetic resonance imaging to photograph what goes on in the brain as people deal with money.

FORBES: This Is Your Brain On Money

It's based on his work using functional magnetic resonance imaging brain scans that first demonstrated that, when people are asked to imagine themselves in retirement, the parts of their brains that usually "light up" when they think about themselves don't light up at all.

FORBES: Magazine Article

Researchers at 11 institutions are mapping the largest conduits among brain regions by combining four imaging techniques, including a new method called diffusion magnetic-resonance imaging that allows researchers for the first time to accurately map the white matter of nerve fibers.

WSJ: Probing the Brain's Mysteries

MRI, first developed 30 years ago, is based on a well established scientific technique, nuclear magnetic resonance, which uses the interaction of magnetic fields with the spin of the nuclei of atoms to provide detailed information on the constituents of chemicals and biological materials.

BBC: Study into health impact of MRI