Efficient CT Metal Artifact Reduction Based on Fractional-Order Curvature Diffusion

Table 1

Parameters of the modified S-L phantom with five metal regions: 𝜏 is the attenuation coefficient; 𝐴, 𝐵 are the lengths of the semiaxes of each ellipse; 𝑥, 𝑦 are the central coordinates of each ellipse; 𝜃 is the rotation angle (in degrees).

No.	𝜏	𝐴	𝐵	𝑥	𝑦	𝜃
1	1.0	0.920	0.6900	0	0	90
2	−0.8	0.874	0.6624	0	−0.0184	90
3	−0.2	0.310	0.1100	0.22	0	72
4	−0.2	0.410	0.1600	−0.22	0	108
5	0.1	0.250	0.2100	0	0.3500	90
6	0.1	0.046	0.0460	0	0.1000	0
7	0.1	0.046	0.0460	0	−0.1000	0
8	0.1	0.046	0.0230	−0.08	−0.6050	0
9	0.1	0.023	0.0230	0	−0.6050	0
10	0.1	0.046	0.0230	0.06	−0.6050	90
11	30.0	0.075	0.0500	0	−0.4800	0
12	25.0	0.030	0.0250	0.25	−0.6200	45
13	30.0	0.040	0.0300	−0.45	0.5000	135
14	30.0	0.050	0.0400	0.45	0.2000	0
15	30.0	0.050	0.0450	−0.42	−0.3000	72