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Abstract #1565

Improved k-t GRAPPA for Phase Contrast Cine MRI by using Modified Artificial Sparsity

Aiqi Sun 1 , Rui Li 1 , Bida Zhang 2 , Chun Yuan 1,3 , and Feng Huang 4

1 Department of Biomedical Engineering & Center for Biomedical Imaging Research, School of Medicine, Beijing, Beijing, China, 2 Philips Research Asia Shanghai, Shanghai, China, 3 Department of radiology, University of Washington, Seattle, WA, United States, 4 Philips Healthcare, Gainesville, FL, United States

The previous studies have shown phase-contrast cine MRI is a powerful tool for studying flow-related physiology and pathophysiology. However, the additional scans for encoding the flow velocity information increase the total scan time and limit the achievable spatial and temporal resolutions within a clinically acceptable duration. Among kinds of k-t reconstruction algorithms exploiting spatiotemporal correlation, k-t GRAPPA has the advantage of self-calibration, but degrades the temporal resolution when acceleration factor is high. Here we propose an artificial sparse scheme using static tissue elimination scheme to improve the temporal resolution preservation of k-t GRAPPA for blood flow measurements of thoracic aorta.

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