Abstract #0863
Reducing susceptibility-induced signal loss in echo planar imaging using a shim insert coil at 7T: Implication for BOLD fMRI
Tae Kim 1 , Tiejun Zhao 2 , Yoojin Lee 1 , Piotr Starewicz 3 , Hoby Hetherington 1 , and Jullie Pan 1
1
Radiology, University of Pittsburgh,
Pittsburgh, PA, United States,
2
Siemens
Medical Solution USA, INC., Siemens MediCare USA,
Pittsburgh, PA, United States,
3
Resonance
Research Inc., Billerica, MA, United States
High degree/order shimming was applied to increase field
homogeneity to reduce susceptibility-induced signal loss
in 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. For
challenging brain regions such as the anterior temporal
and frontal lobes use of the shim insert increased the
temporal-signal-to-noise ratios by 111.2%. Our study
demonstrates that the use of higher order/degree shims
improves GE-EPI BOLD signal at high field.
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