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Abstract #0671

Improved dynamic distortion correction for fMRI using single-echo EPI, a fast sensitivity scan and readout-reversed first image (REFILL)

Simon Daniel Robinson1,2,3, Beata Bachrata3,4, Korbinian Eckstein3, Saskia Bollmann1, Steffen Bollmann5, Siegfried Trattnig3, Christian Enzinger2, and Markus Barth5
1Centre for Advanced Imaging, University of Queensland, Brisbane, Australia, 2Department of Neurology, Medical University of Graz, Graz, Austria, 3Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria, 4Christian Doppler Laboratory for Clinical Molecular MR Imaging, Medical University of Vienna, Vienna, Austria, 5School of Electrical Engineering and Information Technology, University of Queensland, Brisbane, Australia

We propose an improved dynamic distortion correction method for fMRI. A fast (4s) multi-echo GE reference scan is used to calculate coil sensitivities and other non-ΔB0-related contributions to coil phase, and one EPI volume in which the readout direction is reversed allows a phase gradient in the readout direction which is specific to EPI to be determined. Knowledge of these quantities allow fieldmaps to be calculated from the phase of each single-echo EPI volume. Reverse-Encoded First Image and Low resoLution reference scan (REFILL) fieldmaps accurately measure ΔB0 as it changes due to motion and respiration.

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