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Abstract #4042

Optimization and miniaturization of Rx-only coaxial coil interfacing.

Michael Obermann1,2, Lena Nohava1,2, Raphaela Czerny1, Roberta Frass-Kriegl1, Sigrun Roat1, Michael Pichler1, Jacques felblinger3, Jean-Christophe Ginefri2, and Elmar Laistler1
1Division MR Physics, Medical University of Vienna, Vienna, Austria, 2IR4M, Université Paris-Saclay, Orsay, France, 3Université de Lorraine, Nancy, France

Coaxial coils have been introduced recently, the way of interfacing these coils impacts the achievable SNR. In this work, the interfacing circuitry is studied to optimize sensitivity and ensure safety. Performance tests on the bench and in the MR scanner were done for 8-cm 123 MHz coaxial coils, operated at their self-resonance. It was found that a high inductance across the port and symmetric matching capacitors increase SNR. A balun and a phase shifter for preamp decoupling are described, the correct positioning of a fuse is demonstrated. Miniature preamplifiers and toroid inductors minimize size and weight to obtain maximum flexibility.

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