Fast online-customized (FOCUS) parallel transmission pulses: A combination of universal pulses and individual optimization.
7 T
SPINS
kT points
parallel transmission (pTx)
ultra-high-field MRI
universal pulses
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 2021
06 2021
Historique:
received:
20
02
2020
revised:
03
11
2020
accepted:
23
11
2020
pubmed:
6
1
2021
medline:
5
3
2021
entrez:
5
1
2021
Statut:
ppublish
Résumé
To mitigate spatial flip angle (FA) variations under strict specific absorption rate (SAR) constraints for ultra-high field MRI using a combination of universal parallel transmit (pTx) pulses and fast subject-specific optimization. Data sets consisting of B All pTx pulses resulted in decreased mean NRMSE compared to a circularly polarized (CP) pulse (CP = ~28%, UPs = ~17%, and IOPs = ~12%). UPs and IOPs improved homogeneity for all subjects. Differences in NRMSE between study groups were much lower than differences between different pulse types. UPs can be used to generate fast online-customized (FOCUS) pulses gaining lower NRMSE and/or lower SAR values.
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
3140-3153Informations de copyright
© 2021 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.
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