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Abstract #1056

Correction of Gradient Induced Clock Phase Modulation for In-Bore Sampling Receivers

Jonas Reber1, Josip Marjanovic1, Christoph Schildknecht1, David Otto Brunner1, and Klaas Paul Pruessmann1

1ETH Zuerich and University of Zuerich, Institute for Biomedical Engineering, Zuerich, Switzerland

With increasing receive channel counts, moving digitizer electronics close to the coil is desirable for reduced cabling and cable coupling and improved patient safety. However, gradient induction degrades in-bore operated circuit performance. Particularly vulnerable are high quality sampling or mixing clocks, required for digitization or demodulation. Gradient induced oscillator modulations add to the already stringent jitter requirements and therefore directly reduce SNR. We present a method which corrects large parts of clock modulations and therefore increases phase SNR of in-bore acquired data e.g. 18 dB for a sinewave corrupted by EPI gradients.

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