Compressed Sensing MRI Reconstruction from Highly Undersampled -Space Data Using Nonsubsampled Shearlet Transform Sparsity Prior

Figure 6

Comparison of NSST-based CS-MRI reconstruction versus other four schemes for a water phantom. (a) Fully sampled water phantom (256 × 256), (b) simulated -space trajectory (pseudoradial 44 lines mask with 16.35% sampling rate), (c)~(g) reconstruction using TV-CG, zero-filling, ODWT-based, SFLCT-based, and the proposed NSST-based CS-MRI, respectively, and (a1), (c1)~(g1) and (a2), (c2)~(g2) zoom-in of (a), (c)~(g) for two different regions, respectively. The PSNRs of them are 31.02, 23.61, 28.64, 30.34, and 32.52, respectively.