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Abstract #1521

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

1 Department of Biomedical Engineering, UCLA, Los Angeles, CA, United States, 2 Department of Biomedical Physics, UCLA, Los Angeles, CA, United States

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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