Axon diameter index estimation independent of fiber orientation distribution using high-gradient diffusion MRI.
Axon diameter
Diffusion MRI
High b-value
Human Connectome Project (HCP)
Human connectome scanner
Spherical mean technique (SMT)
Tissue microstructure
White matter
Journal
NeuroImage
ISSN: 1095-9572
Titre abrégé: Neuroimage
Pays: United States
ID NLM: 9215515
Informations de publication
Date de publication:
15 11 2020
15 11 2020
Historique:
received:
16
01
2020
revised:
29
06
2020
accepted:
21
07
2020
pubmed:
4
8
2020
medline:
26
2
2021
entrez:
4
8
2020
Statut:
ppublish
Résumé
Axon diameter mapping using high-gradient diffusion MRI has generated great interest as a noninvasive tool for studying trends in axonal size in the human brain. One of the main barriers to mapping axon diameter across the whole brain is accounting for complex white matter fiber configurations (e.g., crossings and fanning), which are prevalent throughout the brain. Here, we present a framework for generalizing axon diameter index estimation to the whole brain independent of the underlying fiber orientation distribution using the spherical mean technique (SMT). This approach is shown to significantly benefit from the use of real-valued diffusion data with Gaussian noise, which reduces the systematic bias in the estimated parameters resulting from the elevation of the noise floor when using magnitude data with Rician noise. We demonstrate the feasibility of obtaining whole-brain orientationally invariant estimates of axon diameter index and relative volume fractions in six healthy human volunteers using real-valued diffusion data acquired on a dedicated high-gradient 3-Tesla human MRI scanner with 300 mT/m maximum gradient strength. The trends in axon diameter index are consistent with known variations in axon diameter from histology and demonstrate the potential of this generalized framework for revealing coherent patterns in axonal structure throughout the living human brain. The use of real-valued diffusion data provides a viable solution for eliminating the Rician noise floor and should be considered for all spherical mean approaches to microstructural parameter estimation.
Identifiants
pubmed: 32745680
pii: S1053-8119(20)30683-2
doi: 10.1016/j.neuroimage.2020.117197
pmc: PMC7736138
mid: NIHMS1630808
pii:
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
117197Subventions
Organisme : NIMH NIH HHS
ID : U01 MH093765
Pays : United States
Organisme : NINDS NIH HHS
ID : K23 NS078044
Pays : United States
Organisme : NIBIB NIH HHS
ID : P41 EB030006
Pays : United States
Organisme : NCRR NIH HHS
ID : S10 RR023043
Pays : United States
Organisme : NINDS NIH HHS
ID : K23 NS096056
Pays : United States
Organisme : NCRR NIH HHS
ID : S10 RR019307
Pays : United States
Organisme : NIBIB NIH HHS
ID : R00 EB015445
Pays : United States
Organisme : NIBIB NIH HHS
ID : U01 EB026996
Pays : United States
Organisme : NIBIB NIH HHS
ID : R01 EB006847
Pays : United States
Organisme : NIBIB NIH HHS
ID : P41 EB015896
Pays : United States
Organisme : NCRR NIH HHS
ID : S10 RR023401
Pays : United States
Informations de copyright
Copyright © 2020 The Author(s). Published by Elsevier Inc. All rights reserved.
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