An improved trap design for decoupling multinuclear RF coils.

Détails

ID Serval
serval:BIB_8C47EE9A14BA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
An improved trap design for decoupling multinuclear RF coils.
Périodique
Magnetic Resonance in Medicine
Auteur(s)
Meyerspeer M., Roig E.S., Gruetter R., Magill A.W.
ISSN
1522-2594 (Electronic)
ISSN-L
0740-3194
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
72
Numéro
2
Pages
584-590
Langue
anglais
Notes
Publication types: Journal ArticlePublication Status: ppublish
Résumé
PURPOSE: Multinuclear magnetic resonance spectroscopy and imaging require a radiofrequency probe capable of transmitting and receiving at the proton and non-proton frequencies. To minimize coupling between probe elements tuned to different frequencies, LC (inductor-capacitor) traps blocking current at the (1) H frequency can be inserted in non-proton elements. This work compares LC traps with LCC traps, a modified design incorporating an additional capacitor, enabling control of the trap reactance at the low frequency while maintaining (1) H blocking.
METHODS: Losses introduced by both types of trap were analysed using circuit models. Radiofrequency coils incorporating a series of LC and LCC traps were then built and evaluated at the bench. LCC trap performance was then confirmed using (1) H and (13) C measurements in a 7T human scanner.
RESULTS: LC and LCC traps both effectively block interaction between non-proton and proton coils at the proton frequency. LCC traps were found to introduce a sensitivity reduction of 5±2%, which was less than half of that caused by LC traps.
CONCLUSION: Sensitivity of non-proton coils is critical. The improved trap design, incorporating one extra capacitor, significantly reduces losses introduced by the trap in the non-proton coil. Magn Reson Med 72:584-590, 2014. © 2013 Wiley Periodicals, Inc.
Mots-clé
X-nucleus, RF coils, 13C, trap, dual-resonant
Pubmed
Web of science
Open Access
Oui
Création de la notice
06/09/2013 6:47
Dernière modification de la notice
20/08/2019 14:50
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