Time-varying sampling functions to improve dynamic magnetic resonance imaging

In dynamic MRI, extra information can be obtained by changing the sampling function from time frame to time frame. The method "unaliasing by Fourier-encoding the overlaps using the temporal dimension" (UNFOLD) provides a way to obtain such extra information, and convert it into desirable features (e.g. increase in temporal resolution, artifact suppression). This paper focuses on UNFOLD and its applications. Compared to the original presentation of the method, the description has been broadened here to account for recently proposed applications. A cardiac example is presented where UNFOLD is merged with the parallel imaging method "sensitivity encoding" (SENSE) to substantially reduce the artifact level.