Meeting Banner
Abstract #3455

Understanding the Limitations of the Effectiveness of Z-Shim for Use with FMRI

Kimberly Brewer1,2, James Rioux1,2, Ryan D'Arcy1,3, Chris Bowen1,4, Steven Beyea1,4

1Institute for Biodiagnostics (Atlantic), National Research Council of Canada, Halifax, Nova Scotia, Canada; 2Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada; 3Psychology and Radiology, Dalhousie University, Halifax, Nova Scotia, Canada; 4Physics and Atmospheric Science, Radiology and Biomedical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada

Over the past decade, the application of z-shim gradients has been successfully used to reduce susceptibility field gradient (SFG) effects. Recently, work has been done to add z-shim to spiral-in, a technique that was designed to recover signal in susceptibility regions. However, questions remain as to whether the potential benefits of combining multiple signal recovery techniques are worth the effort and time to use both techniques. We demonstrate that although z-shim may be efficient at recovering signal in sequences prone to SFG effects, its use does not offer significant benefits at the group level when combined with spiral-in.