Abstract
The theory of dipole–dipole relaxation of protons in water is described. Both classical and simple quantum viewpoints reveal how water relaxation rates reflect the timescales of motions that modulate the magnetic interactions between nuclei in any medium. Rapid molecular motions in water cause transverse relaxation rates to decrease from the values they have in solids and ice, by over five orders of magnitude, and this motional narrowing of resonance linewidths is key to conventional imaging of water in biological tissues. UTE signals can be partly understood in terms of alterations of these rapid motions. Keywords: relaxation; dipolar interactions; motional narrowing; tissue water; longitudinal relaxation; transverse relaxation
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