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Abstract #1013

Field Monitoring During High-Power Transmission Pulses: A Digital Noise Cancelling Approach

David O. Brunner 1 , Benjamin E. Dietrich 1 , Simon Gross 1 , Thomas Schmid 1 , Christoph Barmet 1,2 , and Klaas P. Pruessmann 1

1 Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland, 2 Skope Magnetic Resonance Technologies LLC, Zurich, Switzerland

Field monitoring by NMR based field probes can accurately record the dynamic behavior of the B 0 and gradient fields in an MRI scanner. During high-power transmission pulses the acquisition of the field probe signals was prevented by receiver saturation by large signals coupled from the transmitter. Although the dynamic range problem was recently solved, noise emitted by the power amplifier at the fluorine frequency decreased the SNR if no appropriately filtered by the scanner. Here we present an approach of digitally cancelling the noise from the power amplifier omitting the high-power filters in the scanner system.

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