Table 2. Selected features from among the five candidate tools.
| Feature type | Feature name | Nodule | Margin | Immediate | Extended | Extended+ |
|---|---|---|---|---|---|---|
| Nodule | ||||||
| BS | Mean Sphere Difference | 4 | ||||
| SH | Sphericity | 1 | 10 | |||
| SZ | H2O Equivalent Diameter | 3 | 8 | |||
| IH | 25th HU Percentile | 9 | 7 | 7 | ||
| LTEM | Mean-5 | 6 | ||||
| NGTD | Kurtosis-16 | 8 | 10 | 3 | ||
| Strength | 10 | 3 | 9 | 8 | ||
| GLRL | Gray-Level Variance | 1 | 1 | |||
| High Gray-Level Run Emphasis | 5 | 4 | 11 | 5 | ||
| GLSZ | Gray-Level Non-Uniformity | 2 | 7 | |||
| Low Gray-Level Zone Emphasis | 2 | |||||
| Small Zone Emphasis | 7 | |||||
| Zone-Size Non-Uniformity | 3 | 2 | ||||
| Small Zone High Gray-Level Emphasis | 7 | 8 | ||||
| Parenchyma | ||||||
| IH | Full-Width-At-Half-Maximum | 5 | ||||
| LTEM | Mean-1 | 11 | 9 | |||
| NGTD | Busyness | 1 | 9 | |||
| Contrast | 9 | 4 | 6 | 2 | ||
| GLRL | Gray-Level Non-Uniformity | 12 | 6 | 8 | 6 | |
| Low Gray-Level Run Emphasis | 4 | |||||
| Long Run High Gray-Level Emphasis | 5 | 5 | 3 | 1 | ||
| GLSZ | Low Gray-Level Zone Emphasis | 2 | ||||
| Small Zone High-Gray Level Emphasis | 6 | 4 | ||||
| Total | 10 | 12 | 11 | 9 | 10 | |
BS, border sphere comparison; SH, shape; Sz, size; IH, intensity histogram; LTEM, law’s texture energy measure; NGTD, neighborhood gray-tone difference; GLRL, gray-level run length; GLSZ, gray-level size zone.