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Abstract #1387

Faster Feedback Field Control using Shim Pre-Emphasis

Yolanda Duerst 1 , Bertram J Wilm 1 , Signe J Vannesjo 1 , Benjamin E Dietrich 1 , Simon Gross 1 , David O Brunner 1 , Thomas Schmid 1 , and Klaas P Pruessmann 1

1 ETH Zurich, Zurich, ZH, Switzerland

Real-time field feedback as implemented previously assumed instantaneous and uncoupled shim responses. The violation of this assumption by the real system leads to distortions in the feedback loop. The current work shows the implementation of self-term pre-emphasis for decreasing the shim response time and cross-term pre-emphasis in order to decouple the individual channels. This allows for a faster response to changes in the target field pattern and enables faster and more stable field feedback.

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