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
Department of Biomedical Engineering &
Center for Biomedical Imaging Research, School of
Medicine, Beijing, Beijing, China,
Research Asia Shanghai, Shanghai, China,
of radiology, University of Washington, Seattle, WA,
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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