Abstract #3772
Single echo EPI sequence with dynamic distortion correction: minimization of errors due to motion and breathing.
Barbara Dymerska 1 , Benedikt Poser 2 , Wolfgang Bogner 1 , Eelke Visser 3 , Korbinian Eckstein 1 , Pedro Cardoso 1 , Roland Beisteiner 1,4 , Markus Barth 5 , 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
FMRIB
Centre, Nuffield Department of Clinical Neurosciences,
University of Oxford, Oxford, United Kingdom,
4
Department
of Neurology, Medical University of Vienna, Vienna,
Austria,
5
Centre
for Advanced Imaging, The University of Queensland,
Brisbane, Australia
The geometric distortions encountered in EPI can be
corrected using static or dynamic distortion correction
methods. The static approach does not account for
temporal B0 changes caused by breathing and motion over
the course of an fMRI experiment. Here, we propose a
single-echo EPI sequence in which the echo time is
jittered between two values. Field maps are calculated
between adjacent volumes, enabling a reference-free
dynamic distortion correction. We show that this method
generates accurate maps of local deviations from the
static magnetic field even in the presence of large
motion (up to 12) and fast breathing (0.36 Hz) without
compromising BOLD sensitivity or spatiotemporal
resolution.
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