3D Cylindrical GRAPPA
Breuer F, Blaimer M, Griswold M, Jakob P, Seiberlich N, Speier P
University of Wuerzburg
The advantages of both 3D radial k-space sampling and parallel acquisition techniques for reducing motion artifacts, decreasing imaging time, and providing greater spatial resolution are well-known. This abstract proposes a novel method of applying the GRAPPA reconstruction method to undersampled 3D cylindrical k-space trajectories. Whereas previous authors have suggested using GRAPPA to reconstruct images with purely z-direction undersampling, we show that undersampling in both the z and angular directions provides better image quality and allows for higher acceleration factors. We also demonstrate that the application of a CAIPIRINHA-like rotation of the undersampled radial disks can further improve the reconstruction.