Diffusion tensor distribution imaging.
b-tensor
microscopic diffusion anisotropy
modulated gradient
multidimensional diffusion MRI
orientation dispersion
q-trajectory
Journal
NMR in biomedicine
ISSN: 1099-1492
Titre abrégé: NMR Biomed
Pays: England
ID NLM: 8915233
Informations de publication
Date de publication:
05 2019
05 2019
Historique:
received:
04
10
2017
revised:
28
11
2018
accepted:
19
12
2018
pubmed:
8
2
2019
medline:
18
12
2019
entrez:
8
2
2019
Statut:
ppublish
Résumé
Conventional diffusion MRI yields voxel-averaged parameters that suffer from ambiguities for heterogeneous anisotropic materials such as brain tissue. Using principles from solid-state NMR spectroscopy, we have previously introduced the shape of the diffusion encoding tensor as a separate acquisition dimension that disentangles isotropic and anisotropic contributions to the observed diffusivities, thereby allowing for unconstrained data inversion into diffusion tensor distributions with "size," "shape," and orientation dimensions. Here we combine our recent non-parametric data inversion algorithm and data acquisition protocol with an imaging pulse sequence to demonstrate spatial mapping of diffusion tensor distributions using a previously developed composite phantom with multiple isotropic and anisotropic components. We propose a compact format for visualizing two-dimensional arrays of the distributions, new scalar parameters quantifying intra-voxel heterogeneity, and a binning procedure giving maps of all relevant parameters for each of the components resolved in the multidimensional distribution space.
Identifiants
pubmed: 30730586
doi: 10.1002/nbm.4066
pmc: PMC6593682
doi:
Substances chimiques
Polymers
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e4066Subventions
Organisme : Swedish Research Council
ID : 2018-03697
Pays : International
Organisme : Swedish Research Council
ID : 2014-3910
Pays : International
Organisme : Swedish Foundation for Strategic Research
ID : ITM17-0267
Pays : International
Organisme : Swedish Foundation for Strategic Research
ID : AM13-0090
Pays : International
Informations de copyright
© 2019 The Authors. NMR in Biomedicine published by John Wiley & Sons Ltd.
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