Phys. Rev. Lett. 89, 278101 (2002) [4 pages]

Transverse NMR Relaxation as a Probe of Mesoscopic Structure

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Valerij G. Kiselev^1,* and Dmitry S. Novikov²
¹Section of Medical Physics, University Hospital Freiburg, D79106 Freiburg, Germany
²Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Received 22 January 2002; published 20 December 2002

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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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.89.278101

DOI:

10.1103/PhysRevLett.89.278101

PACS:

87.61.–c, 76.60.Jx, 82.56.Lz

^*Electronic address: kiselev@ukl.uni-freiburg.de

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Phys. Rev. Lett. 89, 278101 (2002) [4 pages]

Transverse NMR Relaxation as a Probe of Mesoscopic Structure

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