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Abstract #0702

Real-Time Shim Feedback for Field Stabilization in Human MRI Systems

Y. Drst1, B. J. Wilm1, B. E. Dietrich1, S. J. Vannesj1, K. P. Pruessmann1

1Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland

Field changes stemming from various sources such as temperature drifts, physiological motion, or any other external effects can severely degrade results of MRI/MRS experiments. We implemented a real-time feedback system where NMR field probes are employed to measure magnetic field variations and actively compensate field changes using the shim coils of a whole-body. Successful field stabilization has been achieved in three experimental situations of varying effect strength, update rate, and spatial order of the field control.