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
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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