PhysLink.com Logo

Question

What is the difference between NMR, MRI and ESR?
Asked by: A.V. Ravishankar Sarma

Answer

The acronyms:

NMR = Nuclear Magnetic Resonance is the resonance that occurs when a nucleus (usually hydrogen, but any nucleus that has non-zero spin will work) is placed in a magnetic field and is 'swept' by a radio frequency that causes the nuclei to 'flip'. This causes the radio frequency to be absorbed, which is what is measured.

MRI = Magnetic Resonance Imaging is a more complex application of NMR in which the geometric source of the resonances are detected and deconvoluted by Fourier transform analysis.

ESR = Electron Spin Resonance is also a resonance phenomenon, except in this case it is the spin of an unpaired electron that is in resonance, rather than a nuclear spin.
Answered by: Vince Calder, Ph.D., Physical Chemist, retired


Science Quote

'The difference between what the most and the least learned people know is inexpressibly trivial in relation to that which is unknown.'

Albert Einstein
(1879-1955)


All rights reserved. © Copyright '1995-'2017 PhysLink.com