Figure 4
Enlarged regions of the reconstructed images of the LC phantom using the FBP (a,e,i), SART (b,f,j), AwTV-POCS (c,g,k) and AwaTpV-POCS (d,h,l) algorithms from 60-view projections under few-view, limited-angle and low-dose noisy limited-angle conditions, respectively. The magnified images were from the same regions in the reconstructed images, as marked with the green rectangle in Fig. 2(a). The pixel values of the above greyscale images were normalized to the range [0, 255]. The display window is [0, 255]. |