Abstract #0671

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

Simon Daniel Robinson^1,2,3, Beata Bachrata^3,4, 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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