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Abstract #4228

Dynamic Multiband Shimming and EPI at 7T

Chan Hong Moon1, Julie W. Pan1, and Hoby P. Hetherington1
1Radiology, University of Pittsburgh, Pittsburgh, PA, United States

At 7T, increased field strength and limited gradient performance results in increased geometric distortions for echo planar imaging. Use of higher order shims and dynamic updating on a slice by slice basis can dramatically reduce the extent of these distortions. This work describes: 1) the theoretical basis for the extension of slice by slice dynamic shim updating for multi-band acquisitions; 2) demonstrates that higher order spherical harmonic shim systems can intrinsically achieve MB=2 imaging with no loss in in-plane homogeneity in comparison to slice by slice shimming (MB=1), and 3) these improvements are easily visualizable in EPI.

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