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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