Abstract #2807

Evaluation of the REFILL dynamic distortion correction method for fMRI

Simon Daniel Robinson^1,2,3, Beata Bachrata³, Korbinian Eckstein³, Barbara Dymerska⁴, Saskia Bollmann², Steffen Bollmann⁵, Shota Hodono², Martijn Cloos², Monique Tourell², Jin Jin⁶, Kieran O'Brien⁶, David Reutens², Siegfried Trattnig³, Christian Enzinger¹, and Markus Barth⁵

¹Department of Neurology, Medical University of Graz, Graz, Austria, ²Centre for Advanced Imaging, University of Queensland, Brisbane, Australia, ³Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria, ⁴UCL Queen Square Institute of Neurology, University College London, London, United Kingdom, ⁵School of Electrical Engineering and Information Technology, University of Queensland, Brisbane, Australia, ⁶Siemens Healthineers, Brisbane, Australia

Synopsis

We evaluate the performance of a recently-proposed dynamic distortion correction (DDC) method for fMRI at 7T, with a task which generates field fluctuations. The Reverse-Encoded First Image and Low resoLution reference scan (REFILL) method generates fieldmaps from the phase of standard, single-echo EPI from fMRI time series, using coil sensitivity information from a fast reference scan and removing other, non-B₀-related contributions to the phase, which are calculated from a readout-reverse EPI volume. In contrast to conventional static distortion correction (SDC) with a GE-based fieldmap, REFILL captured dynamic changes to the field, leading to an accurate correction and increased tSNR.

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