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Abstract #1611

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

1 Electrical Engineering, Stanford University, Stanford, California, United States, 2 Radiology, Stanford University, Stanford, California, United States, 3 Electrical 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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