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Development, simulation, and validation of NMR relaxation-based exchange measurements

J. Chem. Phys. 131, 164502 (2009); doi:10.1063/1.3245866

Published 23 October 2009

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R. D. Dortch,1,2 R. A. Horch,1 and M. D. Does1,2,3
1Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee 37232-2310, USA and Vanderbilt University Institute of Imaging Science (VUISS), Vanderbilt University, Nashville, Tennessee 37232-2310, USA
2Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, Tennessee 37232-2310, USA
3Department of Electrical Engineering, Vanderbilt University, Nashville, Tennessee 37232-2310, USA
Two-dimensional (2D) nuclear magnetic resonance correlation experiments have recently been proposed as a means for studying exchange in porous media. Most notable of these is the T2−T2 relaxation exchange spectroscopy (REXSY) experiment. Unfortunately, quantifying exchange with this method requires a relatively long, three-dimensional acquisition. To reduce acquisition times, novel 2D methods for quantifying exchange were developed. For each method, model equations were derived (for an arbitrary N-pool system), tested via simulation studies, and validated via experimental studies in an aqueous urea model system. Results indicate that the novel methods outperform REXSY—in terms of uncertainty per unit time for the fitted exchange rate—for certain model systems. The relative merits of each method are discussed in the text. ©2009 American Institute of Physics
History: Received 10 July 2009; accepted 21 September 2009; published 23 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/164502/1
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KEYWORDS and PACS

Keywords
PACS
  • 76.60.Es
    Relaxation effects (condensed matter NMR)
  • 61.43.Gt
    Structure of powders and porous materials
  • YEAR: 2009

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ISSN:
0021-9606 (print)   1089-7690 (online)
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