Expected Homogeneity Gain and Hardware Requirements for Slice-Wise 3rd Order 
Dynamic Shim Updating for fMRI

Fillmer, A; Henning, A

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Expected Homogeneity Gain and Hardware Requirements for Slice-Wise 3rd Order Dynamic Shim Updating for fMRI

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Henning, A
Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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http://www.ismrm.org/15/program_files/MonEPS04.htm
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Citation

Fillmer, A., & Henning, A. (2015). Expected Homogeneity Gain and Hardware Requirements for Slice-Wise 3rd Order Dynamic Shim Updating for fMRI. Poster presented at 23rd Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2015), Toronto, Canada.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-4629-2

Abstract

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 B0 shim strategies are required. An auspicious approach for improving B0 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.