Simultaneous Image and K-Space Domain Aliasing for Accelerating Dynamic MRI Scans

Kamlesh Pawar¹, ², Arjun Arunachalam¹

A new technique for accelerating a dynamic MRI scan through simultaneous image and k- space domain aliasing is demonstrated. Parallel Imaging (PMRI) and Compressed Sensing (CS) techniques provide an acceleration factor of A_PMRI/CS while A_kspace via k-space aliasing is provided by a new method that uses multiple RF excitation pulses and gradients to overlap distinct k-space points. Both types of aliasing are corrected during image reconstruction to restore the fidelity of the accelerated dataset. The total acceleration from such a combination is given by A_kspace*A_PMRI/CS as data is sub-sampled in both the image and k-space domains simultaneously during data acquisition.