Abstract #3419

Investigation of Susceptibility Gradient Artifacts in EPI at 7T

Chan Hong Moon¹, Hoby Hetherington^2,3, and Jullie W. Pan^2,4

¹MRRC, Department of Radiology, University of Pittsburgh, Pittsburgh, PA, United States, ²NEXTGEN, Department of Radiology, University of Missouri, Columbia, MO, United States, ³Resonance Research, Inc., Billerica, MA, United States, ⁴University of Missouri, Columbia, MO, United States

Synopsis

Keywords: Artifacts, High-Field MRI, EPI, 7T, Susceptibility, GRAPPA, AliasingWith the development of high-field 7T scanners, interest in high resolution neuroimaging for EPI-based functional and diffusion MRI has increased. However, EPI artifacts at 7T (spatial distortion and signal loss) increase compared to that seen at 3T due to increased B0 inhomogeneity. Furthermore, EPI artifacts become more significant and complicated when parallel imaging is used. As a result, 7T fMRI and DWI suffers from B0 inhomogeneity-induced aliasing as well as the more common EPI artifacts. In this study, the source of B0 inhomogeneity artifact in parallel imaging was investigated and methods to reduce these artifacts are proposed/tested at 7T.

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