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Abstract #2635

Symmetric Vs. Asymmetric Undersampling in 3D Cones Imaging

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

1GE Healthcare, San Diego, CA, United States; 2GE Healthcare, Madison, WI, United States; 3GE Healthcare, Waukesha, WI, United States

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.

Keywords

accelerate acquisition acquisitions additional address adjusted aliasing allow allowing although appearance artifact artifacts asymmetric asymmetry axial axis begin black boxes cause challenge clinical coherent coil commonly cones conical constrain continue conversely coronal curved dashed degrees design designed designs desired duration efficient either encountered equator excitation fashion feasibility fewer finally fixed frequently functions future generally generate generated gradient gurney head highlighted idea included indicated inherently inside introduce investigated isotropic make minimize move multiplied numerical originate outside outwards ovals overall perpendicular phantom physical predominantly preferentially preserve pulse quality radial read readout reconstructed reduced reduces reformatted requires resolution respective rows sampling selective short simulate simulations skipping slices soon space specialized spokes spread straight structure suggested support supported surfaces symmetric symmetrically symmetry system third tissues together trajectories trajectory trans twice typically ultrashort validate visible visualization window