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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