Magnetic Resonance Imaging (MRI)

The NMR frequency depends in large part on the size of an externally applied magnetic field. If the applied magnetic field is not uniform, then a distribution of frequencies will be observed corresponding to the different magnetic fields experienced by different nuclei in the sample present. The more nuclei which are present at a given location, the stronger will be the NMR signal at the frequency determined by the magnetic field which is present at that location. For MRI, the magnetic field is made non-uniform in a very simple way using magnetic field gradient coils. By analyzing the resulting NMR signal, the distribution of the nuclei can then be determined.

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