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T 2 ‐shortening by strongly magnetized spheres: A chemical exchange model †
Author(s) -
Brooks Rodney A.
Publication year - 2002
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10064
Subject(s) - dephasing , spheres , diffusion , limiting , relaxation (psychology) , equivalence (formal languages) , physics , statistical physics , condensed matter physics , range (aeronautics) , magnetic field , nuclear magnetic resonance , materials science , thermodynamics , quantum mechanics , mathematics , mechanical engineering , psychology , social psychology , discrete mathematics , astronomy , engineering , composite material
It is shown that a chemical exchange model can reproduce nuclear magnetic relaxation caused by diffusion of water molecules near strongly magnetized particles. The agreement is based on the similarity (but not equivalence) of the respective “visit‐limiting” mechanisms in the echo‐limited regime. The model leads to a single equation that predicts relaxation behavior in both the motional‐averaging and visit‐limited regimes. When combined with the static‐dephasing regime equation, the result is a simple theory (for spheres) that covers the entire range of diffusion times. Magn Reson Med 47:388–391, 2002. Published 2002 Wiley‐Liss, Inc.