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Reconstructed images of a modified Shepp–Logan phantom from 21 projections after 5000 iterations. While the top-row images are from a noise-free dataset, the bottom-row images are from a dataset with Poisson noise. From left to right, the four columns are reconstructions using the SART method without TV minimization, the steepest descent method for TV minimization, the soft-threshold filtering methods for TV and TD minimization, respectively. The display window is [0, 0.5].
