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Abstract #1353

Current limited superconducting RF coils

Christopher Stumpf 1 , Tobias Frank 1 , Markus Vester 2 , Sebastian Martius 3 , Robert Rehner 2 , Rainer Engelbrecht 1 , and Lorenz-Peter Schmidt 1

1 Institute of Microwaves and Photonics, University of Erlangen-Nuremberg, Erlangen, Bavaria, Germany, 2 Healthcare Sector, Siemens AG, Erlangen, Bavaria, Germany, 3 Corporate Technology, Siemens AG, Erlangen, Bavaria, Germany

Superconducting self-resonant RF coils can be used in MRI as receive coils to raise the image SNR. Those coils distort the TX magnetic field if they are not detuned. A new method is presented to passively detune self-resonant HTS coils without Q-factor reduction by inserting a taper into the coil structure. Measurements of RF current in the loop at varying absorbed powers show that the current is limited to a maximum value. By reducing the trace width of the taper the maximum current value is reduced and the distortion of the TX field due to induction is decreased.

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