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Isotropic diffusion weighting in radial fast spin‐echo magnetic resonance imaging
Author(s) -
Sarlls Joelle E.,
Newbould Rexford D.,
Altbach Maria I.,
Gmitro Arthur F.,
Seeger Joachim,
Trouard Theodore P.
Publication year - 2005
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.20493
Subject(s) - isotropy , weighting , diffusion , fast spin echo , diffusion mri , anisotropy , nuclear magnetic resonance , physics , magnetic resonance imaging , optics , acoustics , medicine , radiology , thermodynamics
Radial fast spin‐echo (radial‐FSE) methods enable multishot diffusion‐weighted MRI (DWMRI) to be carried out without significant artifacts due to motion and/or susceptibility and can be used to generate DWMRI images with high spatial resolution. In this work, a novel method that allows isotropic diffusion weighting to be obtained in a single radial k ‐space data set is presented. This is accomplished by altering the direction of diffusion weighting gradients between groups of TR periods, which yield sets of radial lines that possess diffusion weighting sensitive to motion in different directions. By altering the diffusion weighting directions and controlling the view ordering appropriately within the sequence, an effectively isotropic diffusion‐weighted image can be obtained within one radial‐FSE scan. The order in which radial lines are acquired can also be controlled to yield data sets without significant artifacts due to motion, T 2 decay, and/or diffusion anisotropy. Magn Reson Med 53:1347–1354, 2005. © 2005 Wiley‐Liss, Inc.