Figure 2.

(a) Comparison of NUFFT, GRASP and GRASP-Pro reconstruction with different basis estimation schemes (GRASP-Pro-ref: from fully sampled images; GRASP-Pro: from stack-of-stars k-space centers; GRASP-Pro-orig: from an intermediate reconstruction step). Image reconstruction was performed with 5 spokes grouped in each dynamic frame in each slice using the stack-of-stars golden-angle radial trajectory. NUFFT reconstruction yielded substantial undersampling artifacts. GRASP reconstruction failed to remove artifacts. GRASP-Pro-ref and GRASP-Pro reconstruction were able to recover images with comparable image quality with respect to the reference. GRASP-Pro-orig achieved compromised reconstruction performance. The RMSE and SSIM for each dynamic frame were plotted for each reconstruction method.