Rapid 3D imaging with an undersampled shells k-space trajectory
Shu Y, Riederer S, Bernstein M
Mayo Clinic College of Medicine
The shells trajectory is a 3D non-Cartesian data acquisition method with improved efficiency compared to Cartesian sampling. This work demonstrates that undersampling can be combined with the shells trajectory to further accelerate the acquisition. The undersampling was implemented by removing interleaves from shells with larger radii. The undersampling rate was determined by a Kaiser window with a variable shape parameter . Different values were examined, and an acceptable maximum value of 3.2 was found from phantom and volunteer experiments. It is shown that up to two-fold acceleration can be achieved with reasonable image quality and resolution, and minor artifacts.