A combined 32-channel receive-loops/8-channel transmit-dipoles coil array for whole-brain MR imaging at 7T.

Détails

ID Serval
serval:BIB_5BB710AB63AF
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A combined 32-channel receive-loops/8-channel transmit-dipoles coil array for whole-brain MR imaging at 7T.
Périodique
Magnetic resonance in medicine
Auteur(s)
Clément J., Gruetter R., Ipek Ö.
ISSN
1522-2594 (Electronic)
ISSN-L
0740-3194
Statut éditorial
Publié
Date de publication
09/2019
Peer-reviewed
Oui
Volume
82
Numéro
3
Pages
1229-1241
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
Multichannel receive arrays provide high SNR and parallel-imaging capabilities, while transmit-only dipole arrays have been shown to achieve a large coverage of the whole-brain including the cerebellum. The aim of this study was to develop and characterize the performances of a 32-channel receive-only loop array combined with an 8-channel dipole coil array at 7T for the first time.
The 8Tx-dipoles/32Rx-loops coil array was characterized by the SNR, g-factors, noise correlation matrix, accelerated image quality, and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
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maps, and compared with a commercial 1Tx-birdcage/32Rx-loops array. Simulated and measured <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
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maps were shown for the 8Tx-dipoles/32Rx-loops coil array and compared with the 8Tx/Rx dipole array.
The in-house built 32-channel receive coil demonstrated a large longitudinal coverage of the brain, particularly the upper neck area. G-factors and accelerated MR acquisitions demonstrated robust performances up to R = 4 in 2D, and R = 8 (4 × 2) in 3D. A 83% increase in SNR was measured over the cerebellum with the in-house built 8Tx/32Rx coil array compared to the commercial 1Tx/32Rx, while similar performances were obtained in the cerebral cortex.
The combined 32-channel receive/8-channel transmit coil array demonstrated high transmit-receive performances compared to the commercial receive array at 7T, notably in the cerebellum. We conclude that in combination with parallel transmit capabilities, this coil is particularly suitable for whole-brain MR studies at 7T.
Mots-clé
32-channel, SNR, parallel imaging, phased array, transmit dipoles, ultra-high field
Pubmed
Open Access
Oui
Création de la notice
03/06/2019 8:59
Dernière modification de la notice
21/08/2019 6:13
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