RF coil design strategies for improving SNR at the ultrahigh magnetic field of 10.5T.
array coils
fMRI
neuroimaging
parallel imaging
parallel transmit
self‐decoupled
ultrahigh‐field MRI
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:
16 Oct 2024
16 Oct 2024
Historique:
revised:
15
08
2024
received:
06
05
2024
accepted:
05
09
2024
medline:
17
10
2024
pubmed:
17
10
2024
entrez:
17
10
2024
Statut:
aheadofprint
Résumé
Toward pushing the boundaries of ultrahigh fields for human brain imaging, we wish to evaluate experimentally achievable SNR relative to ultimate intrinsic SNR (uiSNR) at 10.5T, develop design strategies toward approaching the latter, quantify magnetic field-dependent SNR gains, and demonstrate the feasibility of whole-brain, high-resolution human brain imaging at this uniquely high field strength. A dual row 16-channel self-decoupled transmit (Tx) and receive (Rx) array was developed for 10.5T using custom Tx/Rx switches. A 64-channel receive-only array was built to fit into the 16-channel Tx/Rx array. Electromagnetic modeling and experiments were used to define safe operational power limits. Experimental SNR was evaluated relative to uiSNR at 10.5T and 7T. The 64-channel Rx array alone captured approximately 50% of the central uiSNR at 10.5T, while an identical array developed for 7T captured about 76% of uiSNR at 7T. The 16-channel Tx/80-channel Rx configuration brought the fraction of uiSNR captured at 10.5T to levels comparable to the 64-channel Rx array at 7T. SNR data displayed an approximate We demonstrated the ability to approach the uiSNR at 10.5T over the human brain, achieving large SNR gains over 7T, currently the most commonly used ultrahigh-field platform. Whole-brain, high-resolution anatomical and EPI-based functional MRI data were obtained at 10.5T, illustrating the promise of greater than 10T fields in studying the human brain.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : NIH HHS
ID : S10 RR029672
Pays : United States
Organisme : NINDS NIH HHS
ID : P30 NS076408
Pays : United States
Organisme : NINDS NIH HHS
ID : UM1 NS132207
Pays : United States
Organisme : NIBIB NIH HHS
ID : P41 EB027061
Pays : United States
Organisme : NIBIB NIH HHS
ID : R01 EB024536
Pays : United States
Organisme : NIBIB NIH HHS
ID : U01 EB025144
Pays : United States
Informations de copyright
© 2024 The Author(s). Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.
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