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


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

Support Us

Help us keep going. Donate now. Thank you for your support!

Science Quote

'The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in athematics as surely as in poetry.'

Bertrand Russell

All rights reserved. © Copyright '1995-'2015