Abstract #3860
4D phase-contrast un-aliasing using both phase and magnitude
Junmin Liu 1 , Marcus T Alley 2 , Shreyas Vasanawala 2 , and Maria Drangova 1,3
1
Imaging Research Laboratories, Robarts
Research Institute, Schulich School of Medicine &
Dentistry, University of Western Ontario, London,
Ontario, Canada,
2
Department
of Radiology, School of Medicine, Stanford University,
Stanford, CA, United States,
3
Department
of Medical Biophysics, Schulich School of Medicine &
Dentistry, University of Western Ontario, London,
Ontario, Canada
Spatial and temporal unwrapping techniques often fail to
successfully un-alias 4D phase images when the data are
spatially and temporally undersampled. We developed a
new un-aliasing method for 4D flow MRI, which performs
3D spatial phase unwrapping first and then remove
temporal phase aliasing using the temporal profiles of
unwrapped phase and magnitude. In vivo results
demonstrate that incorporating the temporal magnitude
profile in the temporal un-aliasing process produces
aliasing-free 4D flow images, even when they are
acquired with low VENC (~ 50 cm/s), low temporal
resolution (~70 ms), and low spatial resolution (e.g.
torso imaging).
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