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Abstract #2478

Correcting Geometric Distortions of Echo Planar Imaging Using Demons and Reversed Phase Encoding

M. Lyksborg1, 2, H. Lundell2, N. Reislev2, H. R. Siebner2, R. Larsen1, T. B. Dyrby2

1Technical University Of Denmark, Kgs. Lyngby, Denmark; 2Danish Research Centre for Magnetic Resonance, Hvidovre, Denmark

Correcting for geometric distortions of Echo Planar Imaging (EPI) is extremely important for anatomical fidelity. Based on the acquisition of 2 EPIs with reversed gradient polarity, we suggest using an efficient non parametric image registration method to estimate the geometric distortion field. We demonstrate the method on 5 subjects and compare it with a minimally distorted structural image. The method achieves results similar to that of the field map and point spread function method.