Nuclear Magnetic Resonance
The largest area of application of NMR is in medical diagnosis. In this area, the technology is usually referred to as magnetic resonance imaging (MRI). The principle of MRI is identical to that of the use of NMR in chemical analysis. Essentially, the different materials in the body resonate at different frequencies depending on their chemical compositions. Position information is obtained by using an external magnetic field which varies with position, so that resonance at a particular frequency with a given substance, such as fatty tissue, will occur only at a particular position or set of positions within the body. The resonant response is then analyzed and displayed using a computer.
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Science EncyclopediaScience & Philosophy: Nicotinamide adenine dinucleotide phosphate (NADP) to Ockham's razorNuclear Magnetic Resonance - History, Physcial principles, Nuclear spin magnetic moment, Magnetic torque on a nucleus, Nuclear orientation energy