Thursday, January 3, 2013

Difference MRI NMR and ESR

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.

So if you are NMR then it is only the resonance effect no imaging involved, NMR some times used in material analysis. 

MRI is a imaging technique where as NMR and ESR both are methods used for material analysis, but NMRI (Nuclear Magnetic Resonance Imaging) is same as MRI the medical people just deleted the first word as it scares the patients.

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