Abstract #0866
Dynamic correction of geometric distortions in EPI: "CURED"
Barbara Dymerska 1 , Benedikt Poser 2 , Wolfgang Bogner 1 , Eelke Visser 3 , Pedro Cardoso 1 , Markus Barth 4,5 , Siegfried Trattnig 1 , and Simon Robinson 1
1
Departement 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
Nuffield
Department of Clinical Neurosciences, University of
Oxford, Oxford, Oxford, United Kingdom,
4
Erwin
L. Hahn Institute for Magnetic Resonance Imaging, Essen,
Germany,
5
Donders
Institute for Brain, Cognition and Behaviour, Donders
Centre for Cognitive Neuroimaging, Radboud University
Nijmegen, Nijmegen, Netherlands
Echo Planar Imaging suffers from geometric distortions
caused by local magnetic field inhomogeneities. We here
present a new dynamic distortion correction (DDC) based
on an EPI sequence, in which the echo time is alternated
between two values in the odd and even time points
allowing calculation of the field maps between adjacent
time points. Proposed method showed more accurate
distortion correction than static approach. EPI images
were successfully unwarped at 7T using DDC despite head
motion. Additionally, the precision of the activation
localization in fMRI measurements with volunteers
performing chin and motion tasks was improved.
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