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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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