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Magnetic field dependence of solvent proton relaxation induced by Gd3+ and Mn2+ complexes

✍ Scribed by Seymour H. Koenig; Coral Baglin; Rodney D. Brown III; C. Fred Brewer

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
365 KB
Volume
1
Category
Article
ISSN
0740-3194

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✦ Synopsis

The effect of solute paramagnetic ions on the longitudinal magnetic relaxation rate 1/T1 of solvent water protons depends on magnetic field strength and on the chemical environment of the ions. The variation of 1/T1 with field has been measured for solutions of Gd3+ and Mn2+ ions in three grossly different environments near physiological pH: the hydrated aquoion; chelated by EDTA (ethylenediaminetetraacetic acid) and DTPA (diethylenetriaminepentaacetic acid); and bound to the protein concanavalin A. It is demonstrated that over the field range at which NMR imaging is currently being done, the chemical environment can alter 1/T1 of solvent protons by more than an order of magnitude. The relevance of these results to the potential utility of these ions as agents for enhancement of contrast in NMR images is discussed.

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