Reduced Ring Artifacts for PROPELLER Using An Analytical Density Compensation Algorithm During Regridding into Cartesian k-space
Gaddipati A, Chang S, Hartley M, Gui D
Though the k-space is uniformly sampled for each blade with PROPELLER acquisition, the accumulated k-space regridding from all blades is sampled more densely in the low frequencies than in the high frequencies. We derive an analytical density compensation algorithm for PROPELLER based on its sampling pattern, and demonstrate that this density compensation algorithm significantly reduces ring artifacts in phantom studies. In addition, this method is computationally efficient without involving kernel convolution and iterative refinement.