Slice-Localized Soft-Gating for Non-rigid Motion Correction in Free-Breathing 3D Cartesian MRI
Joseph Y. Cheng 1,2 , Tao Zhang 1 , Xinwei Shi 1 , Martin Uecker 3 , Marcus T. Alley 2 , John M. Pauly 1 , Michael Lustig 3 , and Shreyas S. Vasanawala 2
Electrical Engineering, Stanford University,
Stanford, California, United States,
Stanford University, Stanford, California, United
Engineering & Computer Sciences, University of
California, Berkeley, California, United States
Soft-gating (or motion-based weighting) reconstruction
can reduce motion artifacts in free-breathing MRI.
However, the performance of this method depends on the
accuracy of the motion-based weights. For respiratory
motion, the degree of motion varies throughout space.
For 3D Cartesian imaging, 1D spatial localization can be
achieved by transforming the data into the hybrid
(x,ky,kz)-space. Taking advantage of this, x-slice
specific weights are derived and applied to correct for
the varying non-rigid motion on a slice-by-slice basis.
The proposed technique is applied to free-breathing
abdominal imaging of pediatric patients. Improvement
over no soft-gating and soft-gating with a single set of
weights are shown.
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