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Abstract #1633

Distortion Correction in DW-EPI using an Extended PSF Method with a Reversed Gradient Approach

Myung-Ho In 1 , Oleg Posnansky 1 , Erik B. Beall 2 , Mark J. Lowe 2 , and Oliver Speck 1,3

1 Biomedical Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Germany, Magdeburg, Germany, 2 Radiology, Imaging Institute, Cleveland Clinic, Cleveland, OH, USA, OH, United States, 3 Leibniz Institute for Neurobiology, Magdeburg, Germany, Magdeburg, Germany

In echo-planar imaging (EPI), compressed distortion is a more difficult challenge than local stretching as spatial information can be lost in strongly compressed areas. To resolve this problem, two EPIs with opposite phase-encoding (PE) polarity were acquired and combined after distortion correction. A modified point spread function (PSF) mapping and distortion correction method was developed. A single PSF reference acquisition was extrapolated to reverse PE (extended) for reverse PE correction and an improved weighted combination of the two distortion-corrected images that properly accounts for the differential loss of information in forward and reverse PE images.

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