Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Reconstructions of the Shepp-Logan phantom, using noisy projection data, x-z views. Display window: [0.98 1.05]. Based on the noise-free reconstructions as shown in Figure 6, from left to right, the noise variances in the images are measured as 5.872 × 10−5, 5.872 × 10−5, and 5.874 × 10−5.
