A physical phenomenon based upon the magnetic property of the nuclei of certain atoms.
The term is often used to describe a series of techniques that make use of this phenomenon to determine the structure of molecules, by placing them in a strong magnetic field.
Applications in medical imaging include Magnetic Resonance Imaging (MRI) and Magnetic Resonance Spectroscopy (MRS).
Source: GreenFacts
Magnetic Resonance Imaging (MRI) - Magnetic Resonance Spectroscopy (MRS)