• Corpus ID: 51857716

EPI DISTORTION CORRECTION BY CONSTRAINED NONLINEAR COREGISTRATION IMPROVES GROUP FMRI

@inproceedings{Qin2009EPIDC,
  title={EPI DISTORTION CORRECTION BY CONSTRAINED NONLINEAR COREGISTRATION IMPROVES GROUP FMRI},
  author={Shun Qin and Marcel P. Zwiers},
  year={2009}
}
Introduction Because of its short volume acquisition time, echo planar imaging (EPI) has remained the method of choice for most fMRI studies. A well-known problem with EPI are geometric distortions caused by magnetic susceptibility inhomogeneities in the field of view. Especially in the frontal part of the brain, this can cause activation to appear at an offset along the phase encoding (PE) direction from its true location. Additionally, as the distortions tend to vary in severity between… 

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