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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