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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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