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Abstract #0007

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.