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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