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Isotropic diffusion weighting using a triple-stimulated echo pulse sequence with bipolar gradient pulse pairs

Topgaard, Daniel LU (2015) In Microporous and Mesoporous Materials 205. p.48-51
Abstract
Microscopic diffusion anisotropy in porous materials can be quantified from diffusion NMR data acquired with a combination of directional and isotropic diffusion encoding. A drawback with current pulses sequences for isotropic encoding is that they all rely on spin echo sequences, which are only applicable to pore liquids with long transverse relaxation times and porous materials with negligible internal magnetic field gradients. To mitigate these problems, we introduce a pulse sequence based on consecutive stimulated echo blocks with bipolar gradient pulse pairs giving equal diffusion encoding in three successive directions. By varying the angles between these directions, the pulse sequence can be tuned to give either directional or... (More)
Microscopic diffusion anisotropy in porous materials can be quantified from diffusion NMR data acquired with a combination of directional and isotropic diffusion encoding. A drawback with current pulses sequences for isotropic encoding is that they all rely on spin echo sequences, which are only applicable to pore liquids with long transverse relaxation times and porous materials with negligible internal magnetic field gradients. To mitigate these problems, we introduce a pulse sequence based on consecutive stimulated echo blocks with bipolar gradient pulse pairs giving equal diffusion encoding in three successive directions. By varying the angles between these directions, the pulse sequence can be tuned to give either directional or isotropic diffusion encoding. We demonstrate the new pulse sequence by experiments on detergent/water liquid crystals with lamellar, bicontinuous cubic, and reverse 2D hexagonal structures. (C) 2014 Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Magnetic resonance, Pulsed field gradient, q-Vector, Eddy current, Aerosol-OT
in
Microporous and Mesoporous Materials
volume
205
pages
48 - 51
publisher
Elsevier
external identifiers
  • wos:000350190500012
  • scopus:84922271996
  • scopus:85027923869
ISSN
1387-1811
DOI
10.1016/j.micromeso.2014.08.023
language
English
LU publication?
yes
id
dc25d335-2028-4706-949c-650a123b99b3 (old id 5305082)
date added to LUP
2015-04-27 08:27:11
date last changed
2017-09-25 12:22:21
@article{dc25d335-2028-4706-949c-650a123b99b3,
  abstract     = {Microscopic diffusion anisotropy in porous materials can be quantified from diffusion NMR data acquired with a combination of directional and isotropic diffusion encoding. A drawback with current pulses sequences for isotropic encoding is that they all rely on spin echo sequences, which are only applicable to pore liquids with long transverse relaxation times and porous materials with negligible internal magnetic field gradients. To mitigate these problems, we introduce a pulse sequence based on consecutive stimulated echo blocks with bipolar gradient pulse pairs giving equal diffusion encoding in three successive directions. By varying the angles between these directions, the pulse sequence can be tuned to give either directional or isotropic diffusion encoding. We demonstrate the new pulse sequence by experiments on detergent/water liquid crystals with lamellar, bicontinuous cubic, and reverse 2D hexagonal structures. (C) 2014 Elsevier Inc. All rights reserved.},
  author       = {Topgaard, Daniel},
  issn         = {1387-1811},
  keyword      = {Magnetic resonance,Pulsed field gradient,q-Vector,Eddy current,Aerosol-OT},
  language     = {eng},
  pages        = {48--51},
  publisher    = {Elsevier},
  series       = {Microporous and Mesoporous Materials},
  title        = {Isotropic diffusion weighting using a triple-stimulated echo pulse sequence with bipolar gradient pulse pairs},
  url          = {http://dx.doi.org/10.1016/j.micromeso.2014.08.023},
  volume       = {205},
  year         = {2015},
}