TABLE IV.
Features selected by the SFFS, GA-ANN, and SFS methods. The feature pool of 271 features is divided into 9 groups listed in the far-left column. The fraction of the features represented in each group is shown in the middle column. The average percentages of the features selected by the three methods along with their standard deviation intervals are displayed in the far-right columns.
| Feature | SFFS | GA-ANN | SFS | |
|---|---|---|---|---|
| group/type | Fraction | (%) | (%) | (%) |
| Shape | 11/271 | 30.0 ± 16.6 | 54.5 ± 10.5 | 9.1 ± 8.6 |
| Fat | 4/271 | 7.5 ± 12.1 | 55.0 ± 19.7 | 2.5 ± 7.9 |
| Calcifications | 3/271 | 10.0 ± 16.1 | 80.0 ± 28.1 | 0 |
| Texture (mass segment only) | 26/271 | 7.3 ± 3.4 | 46.5 ± 9.3 | 3.5 ± 2.2 |
| Texture (dilated mass segments) | 90/271 | 2.3 ± 1.0 | 47.2 ± 6.5 | 1.7 ± 0.8 |
| Spiculation | 20/271 | 1.5 ± 3.4 | 44.5 ± 8.6 | 0.50 ± 1.6 |
| Contrast | 60/271 | 2.3 ± 1.4 | 48.5 ± 7.8 | 0.83 ± 0.88 |
| Previously computed morphological features | 27/271 | 11.1 ± 4.3 | 57.0 ± 9.1 | 11.5 ± 4.4 |
| Isodensity | 30/271 | 11.0 ± 6.1 | 20.0 ± 3.8 | 3.0 ± 3.1 |