]>An Efficient Estimation Method for Reducing the Axial Intensity Drop in Circular Cone-Beam CT : Figure 12
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Figure 12: Reconstructions of the Shepp-Logan phantom, using noisy projection data, 𝑥 - 𝑧 views. Display window: [ 0 . 9 8 1 . 0 5 ] . 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 . 8 7 2 × 1 0 − 5 , 5 . 8 7 2 × 1 0 − 5 , and 5 . 8 7 4 × 1 0 − 5 .