Comparing Group Sparse Reconstruction of 4D EP-COSI data with Compressed Sensing, Total Variation, and Maximum Entropy Reconstruction
Brian L Burns 1 , Neil Wilson 2 , and M Albert Thomas 1,2
Department of Biomedical Engineering, UCLA,
Los Angeles, CA, United States,
of Biomedical Physics, UCLA, Los Angeles, CA, United
Scan times for the 4D EP-COSI pulse sequence can be
20-40 minutes depending on scan parameters. To reduce
these scans times to clinically acceptable levels
non-uniform under-sampling of the phase encoded
dimensions coupled with non-linear reconstruction can be
used to accelerate acquisition. This work compares the
reconstruction results of 4X and 8X phantom data from
Compressed Sensing, Total Variation, and Maximum Entropy
with Group Sparse reconstruction, a variant of
Compressed sensing that used a mixed 1-1,2 regularizer.
Group Sparse reconstruction with overlapping groupings
is shown to provide qualitatively and quantitatively
superior results to other methods tested.
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