Human Connectome Project-style resting-state functional MRI at 7 Tesla using radiofrequency parallel transmission.
Functional MRI
High field MRI
Human connectome project
Multiband
Parallel transmission
Simultaneous multi-slice
Journal
NeuroImage
ISSN: 1095-9572
Titre abrégé: Neuroimage
Pays: United States
ID NLM: 9215515
Informations de publication
Date de publication:
01 01 2019
01 01 2019
Historique:
received:
04
08
2018
revised:
13
09
2018
accepted:
15
09
2018
pubmed:
22
9
2018
medline:
21
3
2019
entrez:
22
9
2018
Statut:
ppublish
Résumé
We investigate the utility of radiofrequency (RF) parallel transmission (pTx) for whole-brain resting-state functional MRI (rfMRI) acquisition at 7 Tesla (7T). To this end, Human Connectome Project (HCP)-style data acquisitions were chosen as a showcase example. Five healthy subjects were scanned in pTx and single-channel transmit (1Tx) modes. The pTx data were acquired using a prototype 16-channel transmit system and a commercially available Nova 8-channel transmit 32-channel receive RF head coil. Additionally, pTx single-spoke multiband (MB) pulses were designed to image sagittal slices. HCP-style 7T rfMRI data (1.6-mm isotropic resolution, 5-fold slice and 2-fold in-plane acceleration, 3600 image volumes and ∼ 1-h scan) were acquired with pTx and the results were compared to those acquired with the original 7T HCP rfMRI protocol. The use of pTx significantly improved flip-angle uniformity across the brain, with coefficient of variation (i.e., std/mean) of whole-brain flip-angle distribution reduced on average by ∼39%. This in turn yielded ∼17% increase in group temporal SNR (tSNR) as averaged across the entire brain and ∼10% increase in group functional contrast-to-noise ratio (fCNR) as averaged across the grayordinate space (including cortical surfaces and subcortical voxels). Furthermore, when placing a seed in either the posterior parietal lobe or putamen to estimate seed-based dense connectome, the increase in fCNR was observed to translate into stronger correlation of the seed with the rest of the grayordinate space. We have demonstrated the utility of pTx for slice-accelerated high-resolution whole-brain rfMRI at 7T; as compared to current state-of-the-art, the use of pTx improves flip-angle uniformity, increases tSNR, enhances fCNR and strengthens functional connectivity estimation.
Identifiants
pubmed: 30237033
pii: S1053-8119(18)30823-1
doi: 10.1016/j.neuroimage.2018.09.038
pmc: PMC6230486
mid: NIHMS1507886
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
396-408Subventions
Organisme : NIBIB NIH HHS
ID : U01 EB025144
Pays : United States
Organisme : NIBIB NIH HHS
ID : P41 EB015894
Pays : United States
Organisme : NINDS NIH HHS
ID : P30 NS076408
Pays : United States
Organisme : NIMH NIH HHS
ID : U54 MH091657
Pays : United States
Organisme : NIMH NIH HHS
ID : R01 MH111447
Pays : United States
Informations de copyright
Copyright © 2018 Elsevier Inc. All rights reserved.
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