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Abstract #2564

Motion Correction for Variable Density Spiral MRI Using Sampling Overlap as Inherent Navigators

Yilong Liu 1,2 , Xiaodong Ma 2 , Hua Guo 2 , and Ed X. Wu 1,3

1 Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong, Hong Kong, China, 2 Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, Beijing, China, 3 Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, Hong Kong, China

Variable density spiral (VDS) sampling is advantageous for fast imaging, it also has potential in motion correction due to repeated sampling of each interleaf around the k-space center. However, for VDS, the full sampling area of each interleaf may be too small for accurate motion estimation. In this work, the navigation region is defined to cover more than the full sampling area, and we use SPIRiT to further improve navigation region. Results show that our proposed method can significantly remove the artifacts in both simulation and in vivo studies.

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