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Abstract #2334

Susceptibility distortion correction for fMRI

Gina Joue1, Tobias Sommer1, and Siawoosh Mohammadi1

1Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany

Multiband echo planar imaging (EPI) offers increased temporospatial resolution and statistical power for functional magnetic resonance imaging (fMRI) but the higher spatial resolution comes at the cost of higher susceptibility-related spatial distortions. In diffusion MRI (dMRI), studies have shown that distortion correction is better when using blip-reversed EPI data (known under the term blip-up/down images) as compared to the standard fieldmap approach. This has motivated fMRI studies to acquire their data with blip-up/down directions and to use these to reduce susceptibility distortion. Here, we qualitatively illustrate why this can lead to erroneous results and quantify this error across 10 subjects.

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