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Abstract #3719

High resolution gradient-echo EPI using a shim insert coil at 7T: Implication for BOLD fMRI.

Tae Kim1, Yoojin Lee1, Tiejun Zhao2, Hoby Hetherington1, and Jullie Pan1

1University of Pittsburgh, Pittsburgh, PA, United States, 2Siemens Medical Solution USA, INC, Pittsburgh, PA, United States

High degree/order shimming was applied to improve field homogeneity thereby reducing susceptibility-induced distortion in high resolution gradient-echo EPI using a shim insert coil at 7T. Use of the shim insert improved the overall homogeneity across the entire brain by 30% in comparison to conventional 1st&2nd degree/order shimming. The susceptibility-induced displacement improved by more than 2cm and the number of activated pixels increased by 150% with higher degree shimming in regions such as the anterior temporal and frontal lobes. Our study demonstrates that the use of higher order/degree shims improves GE-EPI BOLD signal at high field.

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