Unaliasing by Fourier‐encoding the overlaps using the temporal dimension (UNFOLD), applied to cardiac imaging and fMRI

In several applications, MRI is used to monitor the time behavior of the signal in an organ of interest; e.g., signal evolution because of physiological motion, activation, or contrast‐agent accumulation. Dynamic applications involve acquiring data in a k–t space, which contains both temporal and spatial information. It is shown here that in some dynamic applications, the t axis of k–t space is not densely filled with information. A method is introduced that can transfer information from the k axes to the t axis, allowing a denser, smaller k–t space to be acquired, and leading to significant reductions in the acquisition time of the temporal frames.

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