An Efficient Estimation Method for Reducing the Axial Intensity Drop in Circular Cone-Beam CT

Figure 12

Reconstructions of the Shepp-Logan phantom, using noisy projection data, 𝑥-𝑧 views. Display window: [0.981.05]. 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.