Sinogram Restoration for Low-Dosed X-Ray Computed Tomography Using Fractional-Order Perona-Malik Diffusion

Figure 1

Shepp-Logan phantoms. (a) Original ideal reconstructed phantom. (b) Simulated LDCT reconstructed phantom. (c) LDCT reconstructed phantom processed by 5×5 median filter. (d) LDCT reconstructed phantom processed by 5×5 wiener filter. (e) LDCT reconstructed phantom processed by Gaussian smoothing with [𝜎=1.8,𝜇=0]. (f) LDCT reconstructed phantom processed by PMD with [𝜎=2]. (g) LDCT reconstructed phantom processed by FPMD with [𝜎=2,𝛼=0.2]. (h) LDCT reconstructed phantom processed by FPMD with [𝜎=2,𝛼=0.5]. (i) LDCT reconstructed phantom processed by FPMD with [𝜎=2,𝛼=1.5].

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