NDLI: Magnetic field inhomogeneity effects on spin echo NMR diffusion measurements

Content Provider	IEEE Xplore Digital Library
Author	Yee, O.P. Nyenhuis, J.A. Stroshine, R.L. Wai, W.K.
Copyright Year	1965
Abstract	In this work, we evaluate the impact of field inhomogeneity on nuclear magnetic resonance (NMR) measurement of diffusion via the spin echo technique. Computer simulations, using a model that accounts for diffusion within samples, indicate that echo ratio measurements can differ from Carr-Purcell theory predictions by as little as a few tenths of a percent and by as much as 30% for a 0.073 m diameter sample under a 0.035 T/m gradient. Experiments with water as the test sample corroborate that measured echo ratios deviate from Carr-Purcell theory with larger sample sizes and larger applied magnetic field gradients, regardless of whether diffusion or T/sub 2/ decay is the dominant mechanism acting on echo ratio. This difference can be attributed to imperfect flipping angles of magnetization across the samples, associated with the finite duration of the 180/spl deg/ rf refocusing pulses.
Sponsorship	IEEE Magnetics Society
Starting Page	3584
Ending Page	3586
Page Count	3
File Size	372527
File Format	PDF
ISSN	00189464
Volume Number	31
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic field measurement Nuclear magnetic resonance Magnetization Pulse measurements Nonuniform electric fields Magnetic resonance Size measurement Solid modeling Polyethylene Agricultural engineering
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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