Fig. 4.

Estimates of ${\{A_k(x,y=0)\}}_{k=0}^{89}$ by using (b) the FBFIR-Hann method, (c) the FBFIR-PCA method, and (d) the LRME-STIR method from the noisy data contaminated with 20% Gaussian white noise, respectively. The original phantom is plotted in panel (a). The gray-scale window is $[-0.1,1.1]$.