4D flow MRI enables visualization and quantification of complex blood flow, and provides relevant biomarkers, such as wall shear stress. A 4D flow MRI acquisition, however, takes between 15-40 min, which complicates its use in clinical practice. In this work, we developed a technique to reduce scan time by prospectively undersampling k-space in a pseudo-spiral Cartesian fashion. Combined with a Compressed Sensing reconstruction using a total variation sparsifying transform in time, this technique makes 4D flow MRI in the carotid arteries 20-30 times faster, while preserving accuracy in flow and wall shear stress measurements.
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