Accelerated MRI Through Aliased and Sub-Sampled K-Space Acquisitions

Arjun Arunachalam¹

A method for restoring aliased, sub-sampled k-space for a multiplicative increase in scan acceleration is presented. Recently, the RATE method for accelerating dynamic MRI by acquiring and then restoring aliased k-space through a Fourier transformation was presented. In this work, its shown that for normal and dynamic MRI, receiver sensitivities can be used to restore aliased k-space. Also, if aliased k-space is sub-sampled, Parallel Imaging is used first to synthesize the un-acquired samples. Next, the coil sensitivities are used again with the acquired, synthesized samples in an iterative reconstruction to enable acceleration factors as high as 12 for 2D scans.