Abstract #3777
Gibbs-Ringing artifact removal based on local subpixel-shifts
Elias Kellner 1 , Bibek Dhital 1 , Valerij G. Kiselev 1 , and Marco Reisert 1
1
Department of Radiology, Medical Physics,
University Medical Center Freiburg, Freiburg, Germany
Gibbs-ringing originates from the convolution of sharp
edges in an object with the point-spread function, which
is typically a sinc-function. They are strongest when
the sinc is sampled at the extrema, and virtually
disappear when it is sampled at its zero crossings. In
this work, we propose a correction method based on local
subvoxel pixel shifts, such that the oscillations are
locally sampled at the zero crossings, and hence
disappear. Compared to the popular global filtering
approach, the proposed significantly better removes the
artifact, while it introduces less smoothing and
preserves the edges.
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