Dymerska, Barbara;
Poser, Benedikt;
Bogner, Wolfgang;
Visser, Elke;
Cardoso, Pedro;
Barth, Markus;
Trattnig, Siegfried;
(2014)
Dynamic correction of geometric distortions in EPI: "CURED".
Presented at: SMRT 23rd Annual Meeting, Milan, Italy.
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Abstract
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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