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

Figure 2

Abdominal CT images of a 62-year-old woman. (a) Original SDCT image with tube current time product 150 mAs. (b) Original LDCT image with tube current time product 60 mAs. (c) LDCT image processed by 5×5 median filter. (d) LDCT image processed by 5×5 wiener filter. (e) LDCT image processed by Gaussian smoothing with [𝜎=1.8,𝜇=0]. (f) LDCT image processed by PMD with [𝜎=2]. (g) LDCT image processed by FPMD with [𝜎=2,𝛼=0.2]. (h) LDCT image processed by FPMD with [𝜎=2,𝛼=0.5]. (i) LDCT image processed by FPMD with [𝜎=2,𝛼=1.5].

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