Yolanda Duerst1, Bertram J. Wilm1, Benjamin E. Dietrich1, Simon Gross1, Thomas Schmid1, David O. Brunner1, and Klaas P. Pruessmann1
Update steps of
real-time field control suffer from imperfect shim responses which degrade
control quality. By including full 3rd-order matrix pre-emphasis as
an additional filter in the control loop, all self-term responses are shaped to
be equal and all cross-term responses are directly suppressed. This leads to
disturbances being rejected faster and less noise amplification. Thus enables better
field control in demanding situations such as caused by disturbance of high
spatial and temporal variability.
