Symmetric Vs. Asymmetric Undersampling in 3D Cones Imaging

Michael Carl¹, James H. Holmes², Graeme C. McKinnon³

In radial out sequences, isotropic undersampling the number of k-space spokes is a popular way to accelerate the acquisition time. In 3D Cones, the trajectories inherently lie on conical surfaces and therefore allow k-space trajectories to support asymmetric FOVs and undersampling. Here we investigated the image quality tradeoffs for asymmetric undersampling under constrain of a fixed total same scan time. We found that increasing the undersampling along the symmetry axis of the Cones surfaces (z-axis) increases the artifact appearance, while reduced artifacts were observed when the overall undersampling was performed preferentially in the x-y plane.