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Abstract #3770

Dynamic distortion correction with standard single-echo EPI: development of the method for multi-channel coils at 7T and accuracy in the presence of substantial motion.

Barbara Dymerska 1 , Benedikt Poser 2 , Markus Barth 3 , Siegfried Trattnig 1 , and Simon Daniel Robinson 1

1 High Field MR Center, Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Vienna, Austria, 2 Department of Psychology and Neuroscience, Cognitive Neuroscience, Maastricht University, Maastricht, Netherlands, 3 Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia

Dynamic maps of B0 can be extracted from a time series of standard, single-echo EPI by calculating the echo-time-independent phase (or offset) from a reference measurement and subtracting this from the phase of each EPI. This yields a field map for each volume. In this study we i) improve the SNR of the field maps by using a GE rather than EPI reference scan and ii) modify the method for multi-channel coils. In experiments at 7 T we find that while B0 varies dramatically with head motion, phase offsets remain stable, allowing distortions to be accurately corrected.

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