Decoupling Scheme for a Cryogenic Rx-Only RF Coil for 13C Imaging at 3T
Juan D. Sánchez-Heredia1, Esben Søvsø Szocska Hansen2,3, Christoffer Laustsen2, Vitaliy Zhurbenko1, and Jan H. Ardenkjær-Larsen 1
1Department of Electrical Engineering, Technical University of Denmark, Kgs Lyngby, Denmark, 2MR Research Centre, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark, 3Danish Diabetes Academy, Odense, Denmark
In this study we evaluate the different active decoupling
schemes that can be used to drive an Rx-only coil, in order to determine the
optimal design for 13C MRI at 3T. Three different circuit schemes
are studied: two known ones (with regular series and parallel tuning
respectively), and a novel one which we found to be optimal for this case. The
circuits have been cooled to 77K to reduce coil noise. Preliminary tests with
the preamplifier cooled to 77K for reduction of noise figure, are also reported.
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