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.