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Experimental determination of pore shape and size using q-space NMR microscopy in the long diffusion-time limit

Topgaard, Daniel LU and Söderman, Olle LU (2003) In Magnetic Resonance Imaging 21(1). p.69-76
Abstract
The signal obtained with q-space NMR imaging applied to a confined liquid is directly related to the pore shape in the limit where all molecules have sampled the whole pore. We investigate the diffusion of water across a similar to50 mum thick film formed between planes of glass. The diffusion time t is changed almost three orders of magnitude. For short t, the root-mean-square displacement increases with a rate which is slightly less than for freely diffusing water. At t longer than 0.3 s, the displacement,is constant at 24 mum which implies that t he water is confined in the measuring direction defined by the applied gradient pulses. Perfectly smooth and aligned planes give rise to sharp diffraction-like features on the echo attenuation... (More)
The signal obtained with q-space NMR imaging applied to a confined liquid is directly related to the pore shape in the limit where all molecules have sampled the whole pore. We investigate the diffusion of water across a similar to50 mum thick film formed between planes of glass. The diffusion time t is changed almost three orders of magnitude. For short t, the root-mean-square displacement increases with a rate which is slightly less than for freely diffusing water. At t longer than 0.3 s, the displacement,is constant at 24 mum which implies that t he water is confined in the measuring direction defined by the applied gradient pulses. Perfectly smooth and aligned planes give rise to sharp diffraction-like features on the echo attenuation curve, i.e., NMR signal vs. the reciprocal space vector q. The experimental data with rather smooth local minima and maxima can be explained in terms of either surface roughness or a misalignment of the plan

s. We discuss the averaging effect of diffusion along a laterally inhomogeneous

film and propose two model-free methods to determine the pore shape

from the echo attenuation curve obtained in the long-t limit. (C) 2003

Elsevier Science Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
q-space imaging, NMR microscopy, Restricted diffusion, Diffusion diffraction
in
Magnetic Resonance Imaging
volume
21
issue
1
pages
69 - 76
publisher
Elsevier
external identifiers
  • wos:000181424500010
  • pmid:12620549
  • scopus:0037217779
ISSN
1873-5894
DOI
10.1016/S0730-725X(02)00626-4
language
English
LU publication?
yes
id
52927997-6e0e-44e9-8916-421e630b71a4 (old id 122247)
date added to LUP
2007-07-12 13:25:07
date last changed
2018-10-03 10:54:10
@article{52927997-6e0e-44e9-8916-421e630b71a4,
  abstract     = {The signal obtained with q-space NMR imaging applied to a confined liquid is directly related to the pore shape in the limit where all molecules have sampled the whole pore. We investigate the diffusion of water across a similar to50 mum thick film formed between planes of glass. The diffusion time t is changed almost three orders of magnitude. For short t, the root-mean-square displacement increases with a rate which is slightly less than for freely diffusing water. At t longer than 0.3 s, the displacement,is constant at 24 mum which implies that t he water is confined in the measuring direction defined by the applied gradient pulses. Perfectly smooth and aligned planes give rise to sharp diffraction-like features on the echo attenuation curve, i.e., NMR signal vs. the reciprocal space vector q. The experimental data with rather smooth local minima and maxima can be explained in terms of either surface roughness or a misalignment of the plan<br/><br>
s. We discuss the averaging effect of diffusion along a laterally inhomogeneous<br/><br>
	film and propose two model-free methods to determine the pore shape<br/><br>
	from the echo attenuation curve obtained in the long-t limit. (C) 2003<br/><br>
	Elsevier Science Inc. All rights reserved.},
  author       = {Topgaard, Daniel and Söderman, Olle},
  issn         = {1873-5894},
  keyword      = {q-space imaging,NMR microscopy,Restricted diffusion,Diffusion diffraction},
  language     = {eng},
  number       = {1},
  pages        = {69--76},
  publisher    = {Elsevier},
  series       = {Magnetic Resonance Imaging},
  title        = {Experimental determination of pore shape and size using q-space NMR microscopy in the long diffusion-time limit},
  url          = {http://dx.doi.org/10.1016/S0730-725X(02)00626-4},
  volume       = {21},
  year         = {2003},
}