Regularized Multidirections and Multiscales Anisotropic Diffusion for Sinogram Restoration of Low-Dosed Computed Tomography

Figure 5

Recovered LDCT images of Figure 2(c) using RMDMS-AD (the first row), RPM (the second row [2]), PM (the third row [1]), WE-PM (the fourth row [3]), and WT-PM (the fifth row [11]) with different iteration numbers 𝑡=5 (the first column), 𝑡=10 (the second column), and 𝑡=20 (the third column). The other parameters include 𝜎₁=1.5, 𝜎=2, and 𝜆=1/7 and scale 𝑠=3 for the proposed method.

(a) Recovered LDCT image using RMDMS-AD with 𝑡=5

(b) Recovered LDCT image using RMDMS-AD with iteration number 𝑡=10

(c) Recovered LDCT image using RMDMS-AD with iteration number 𝑡=20

(d) Recovered LDCT image using RPM [2] with iteration number 𝑡=5

(e) Recovered LDCT image using RPM [2] with iteration number 𝑡=10

(f) Recovered LDCT image using RPM [2] with iteration number 𝑡=20

(g) Recovered LDCT image using PM [1] with iteration number 𝑡=5

(h) Recovered LDCT image using PM [1] with iteration number 𝑡=10

(i) Recovered LDCT image using PM [1] with iteration number 𝑡=20

(j) Recovered LDCT image using WE-PM [3] with iteration number 𝑡=5

(k) Recovered LDCT image using WE-PM [3] with iteration number 𝑡=10

(l) Recovered LDCT image using WE-PM [3] with iteration number 𝑡=20

(m) Recovered LDCT image using WT-PM [11] with iteration number 𝑡=5

(n) Recovered LDCT image using WT-PM [11] with iteration number 𝑡=10

(o) Recovered LDCT image using WT-PM [11] with iteration number 𝑡=20