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Transverse NMR relaxation as a probe of mesoscopic structure
Valerij G Kiselev1, Dmitry S Novikov
1Section of Medical Physics, University Hospital Freiburg, D79106 Freiburg, Germany. kiselev@ukl.uni-freiburg.de
Abstract:
Transverse NMR relaxation in a macroscopic sample is shown to be extremely sensitive to the structure of mesoscopic magnetic susceptibility variations. Such a sensitivity is proposed as a novel kind of contrast in the NMR measurements. For suspensions of arbitrary-shaped paramagnetic objects, the transverse relaxation is found in the case of a small dephasing effect of an individual object. Strong relaxation rate dependence on the objects' shape agrees with experiments on whole blood. Demonstrated structure sensitivity is a generic effect that arises in NMR relaxation in porous media, biological systems, as well as in kinetics of diffusion limited reactions.