TABLE III. Experimental Results for CT Images using Semantic Segmentation Methods (Replacing Real Data with Different Proportions of Synthetic Data) (The Best Evaluation Score is Marked in Bold. 
means Higher Number is Better, and 
Indicates Lower Number is Better. Ratio Means Replacing Certain Proportion of Synthetic Data. 
Represents a Small Positive Quantity which is Smaller than 
. 50%
, 50%
, 50%
, 50%
Represent the Synthetic Data are from SEAN [15], SPADE [14], Pix2pixHD [13] and Pix2pix [12], Respectively.
| Focus | Ground-glass opacity | Consolidation | Infection | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Ratio | Dice (%,  ) |
Sen (%,  ) |
Spec (%,  ) |
Dice (%,  ) |
Sen (%,  ) |
Spec (%,  ) |
Dice (%,  ) |
Sen (%,  ) |
Spec (%,  ) |
| 0% |
87.55 0.20
|
86.84 0.31
|
99.82 0.01 |
84.88 0.33 |
82.80 0.51 |
99.96
|
89.57 0.18
|
88.58 0.23
|
99.82 0.01 |
| 10% | 87.34 0.27 |
85.08 0.45 |
99.85 0.01
|
85.91 0.44 |
84.23 0.55 |
99.96
|
89.35 0.32 |
87.14 0.39 |
99.85 0.01
|
| 20% | 84.22 0.36 |
83.38 0.41 |
99.77 0.01 |
84.30 0.19 |
83.60 0.33 |
99.95
|
86.67 0.36 |
85.83 0.27 |
99.76 0.01 |
| 30% | 87.43 0.35 |
85.73 0.41 |
99.84 0.01 |
86.01 0.21
|
87.14 0.21
|
99.95
|
89.32 0.22 |
88.11 0.30 |
99.82 0.01 |
| 40% | 87.07 0.27 |
86.70 0.29 |
99.80 0.01 |
85.81 0.24 |
81.94 0.36 |
99.97
|
88.92 0.20 |
87.90 0.30 |
99.81 0.01 |
| 50% | 86.98 0.35 |
86.46 0.40 |
99.80 0.01 |
85.58 0.23 |
82.18 0.36 |
99.97
|
89.19 0.24 |
88.12 0.37 |
99.82 0.01 |
50%
|
85.23 0.40 |
84.99 0.31 |
99.80 0.01 |
83.54 0.22 |
83.66 0.19 |
99.97
|
86.04 0.29 |
86.00 0.39 |
99.82 0.01 |
50%
|
83.04 0.28 |
81.56 0.24 |
99.80 0.01 |
81.89 0.20 |
81.50 0.30 |
99.96
|
85.99 0.21 |
84.05 0.15 |
99.81 0.01 |
50%
|
81.24 0.37 |
79.53 0.29 |
99.79 0.01 |
80.20 0.44 |
78.14 0.46 |
99.96
|
83.22 0.45 |
83.01 0.48 |
99.80 0.01 |
50%
|
75.33 0.24 |
71.02 0.38 |
99.75 0.01 |
72.01 0.25 |
70.55 0.21 |
99.95
|
79.10 0.25 |
78.89 0.39 |
99.77 0.01 |