Table 6.
The key relative features selected by cross-validation, 500 times.
| AD |
MCI |
AD + MCI |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Feature | R | times | ICCa | Feature | R | times | ICCa | Feature | R | times | ICCa |
| Energy | 1 | 488 | 0.956 | Entropy | 1 | 475 | 0.949 | Skewness | 1 | 412 | 0.901 |
| GLV | 1/3 | 479 | 0.947 | Homogeneity | 1 | 471 | 0.941 | Coarseness | 1 | 387 | 0.875 |
| Contrast | 1 | 465 | 0.931 | SRE | 1/2 | 447 | 0.927 | Correlation | 3/2 | 331 | 0.821 |
| Variance | 2/3 | 461 | 0.933 | RP | 2/3 | 413 | 0.894 | SZLGE | 2/3 | 317 | 0.806 |
| Entropy | 1 | 443 | 0.915 | Energy | 1 | 397 | 0.881 | Skewness | 1/2 | 311 | 0.803 |
| ZSV | 3/2 | 410 | 0.899 | GLV | 2/3 | 374 | 0.836 | – | |||
| HGRE | 1/2 | 393 | 0.878 | RLN | 1/2 | 363 | 0.829 | ||||
| SZHGE | 1 | 389 | 0.842 | LZE | 1 | 330 | 0.815 | ||||
| LRHGE | 2/3 | 354 | 0.827 | Dissimilarity | 1 | 314 | 0.803 | ||||
| RLV | 1 | 316 | 0.807 | ZP | 1/2 | 276 | 0.797 | ||||
a
ICC > 0.9 means excellent consistency and ICC > 0.8 means statistically acceptable consistency.
AD, Alzheimer’s disease; ADNI, Alzheimer’s Disease Neuroimaging Initiative; GLV, gray-level variance; HGRE, high-gray-level run emphasis; ICC, intraclass correlation coefficient; LRHGE, long-run high-gray-level emphasis; LZE, large zone emphasis; MCI, mild cognitive impairment; RLN, run-length nonuniformity; RLV, run-length variance; RP, run percentage; SRE, short-run emphasis; SZHGE, small zone high-gray-level emphasis; SZLGE, small zone low-gray-level emphasis; ZP, zone percentage; ZSV, zone-size variance.