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

Figure 3

Decomposition coefficient of a T2 brain MR image with sarcoma based on NSST, of 3 resolution scales, 6, 8, and 12 directions for every scale, respectively. (a) T2 brain MR image with sarcoma. (b) Lowpass subband, the approximate shearlet coefficients. (c)~(e) The detail shearlet coefficients of decomposition level 1, level 2, and level 3 in every direction, respectively, with the full colormap scaling for better presentation.