Fig. 5
From: A sinogram denoising algorithm for low-dose computed tomography
The left column shows a profile through the 500−μ m coil in the images of the physical phantom reconstructed from noisy and denoised projections: a without denoising, b bilateral filtering, c NL-PCA, and d the proposed algorithm. In each of these plots in the left column, we have included the profile of the reference image (the blue curves). For a better comparison of the denoising algorithms, in the right column we have shown the difference between the profiles shown in the left column and the profile of the reference image