A comprehensive approach for correcting voxel-wise b-value errors in diffusion MRI.
b-value
diffusion MRI
diffusion gradient
diffusion tensor
gradient nonlinearity
Journal
Magnetic resonance in medicine
ISSN: 1522-2594
Titre abrégé: Magn Reson Med
Pays: United States
ID NLM: 8505245
Informations de publication
Date de publication:
06 2020
06 2020
Historique:
received:
08
08
2019
revised:
23
09
2019
accepted:
22
10
2019
pubmed:
17
12
2019
medline:
15
5
2021
entrez:
17
12
2019
Statut:
ppublish
Résumé
In diffusion MRI, the actual b-value played out on the scanner may deviate from the nominal value due to magnetic field imperfections. A simple image-based correction method for this problem is presented. The apparent diffusion constant (ADC) of a water phantom was measured voxel-wise along 64 diffusion directions at b = 1000 s/mm The b-value-corrected ADC maps of the phantom showed the expected spatial uniformity as well as a marked improvement in consistency across diffusion directions. The b-value correction for the brain data resulted in a 5.8% and 5.5% decrease in mean diffusivity and angular differences of the primary diffusion direction of 2.71° and 0.73° inside gray and white matter, respectively. The actual b-value deviates significantly from its nominal setting, leading to a spatially variable error in the common diffusion outcome measures. The suggested method measures and corrects these artifacts.
Identifiants
pubmed: 31840300
doi: 10.1002/mrm.28078
pmc: PMC7065087
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2173-2184Subventions
Organisme : Wellcome Trust
Pays : United Kingdom
Organisme : Medical Research Council
ID : MR/R006504/1
Pays : United Kingdom
Organisme : Wellcome Trust
ID : 079866/Z/06/Z
Pays : United Kingdom
Organisme : Wellcome Trust
ID : 091593/Z/10/Z
Pays : United Kingdom
Informations de copyright
© 2019 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine.
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