Fig. 2
From: A sinogram denoising algorithm for low-dose computed tomography
Comparison between different denoising algorithms in terms of RMSE and MI for the high-noise projections (top row) and low-noise projections (bottom row) simulated from the Shepp-Logan phantom. Values for the bilateral filtering algorithm are plotted as a function of σ (the bottom horizontal axis), whereas the values for the proposed algorithm are plotted as a function of the regularization parameter λ (the top horizontal axis). The solid squares indicate the points of optimum