Abstract #3211
Expected Homogeneity Gain and Hardware Requirements for Slice-Wise 3 rd Order Dynamic Shim Updating for fMRI
Ariane Fillmer 1 and Anke Henning 2
1
Institute for Biomedical Engineering, UZH
and ETH Zurich, Zurich, Switzerland,
2
Max
Planck Institute for Biological Cybernetics, Tuebingen,
Germany
EPI allows for very fast acquisition, and is the work
horse of conventional fMRI. To exploit the full
advantage of applying ultra-high fields to fMRI,
sophisticated B
0
shim
strategies are required. An auspicious approach for
improving B
0
homogeneity
is DSU. As eddy-currents arise from fast switching of
shim currents a careful pre-emphasis calibration is
necessary. The application of pre-emphasis requires the
limitation of the shim fields, which limits the
homogeneity gain expected from DSU. This work compares
the expected homogeneity gain from a global and a
slice-wise DSU shim approach and investigates the
hardware requirements for optimal slice-wise dynamic
shimming.
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