Free breathing abdomen imaging requires non-rigid motion registration of the unavoidable respiratory motion in the 3D under-sampled datasets. In this work, pyramidal Lucas-Kanade based optical flow estimation is proposed to perform upper abdomen registration, which enables reconstruction of motion-free abdominal images throughout the respiratory cycle. Preliminary results on images acquired using 3D golden radial phase encoding eThrive scan demonstrate that our approach makes vessels in liver sharper and more consecutive when compared to traditional NMC and LREG based methods.
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