Design and use of a folded four-ring double-tuned birdcage coil for rat brain sodium imaging at 9.4â¯T.
J Magn Reson
; 286: 110-114, 2018 01.
Article
en En
| MEDLINE
| ID: mdl-29227914
ABSTRACT
A folded four-ring quadrature birdcage coil was designed and constructed with a double-tune configuration of an outer high-pass coil for 1H (400â¯MHz) and inner low-pass coil for 23Na (105.72â¯MHz at 9.4â¯T). The coil was evaluated on the bench and in the scanner, comparing its performance with that of single-tuned coils and a large four-ring coil. All coils were tuned and matched and the isolation between two quadrature ports was found to be better than -13.7â¯dB for 1H and -27â¯dB for 23Na. Signal-to-noise ratios (SNRs) were calculated and 23Na flip angle maps were acquired. 23Na SNR of the folded four-ring reached â¼93% of that obtained with the single-tuned coil. A set of in vivo1H and 23Na axial images to cover the whole rat brain were obtained. The performance of the folded four-ring coil and its benefit for 23Na imaging experiments have been demonstrated. This proposed four-ring coil could avoid length restrictions, e.g. the shoulders, by folding the outer rings vertically. This facilitates the construction of double-tuned four-ring birdcage coils just to fit the head, leading to higher filling factors and better SNR.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Sodio
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Encéfalo
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Imagen por Resonancia Magnética
Límite:
Animals
Idioma:
En
Revista:
J Magn Reson
Asunto de la revista:
DIAGNOSTICO POR IMAGEM
Año:
2018
Tipo del documento:
Article
País de afiliación:
Alemania