Table 3.
Radiomics features extracted from each brain metastasis
| Parent matrix | Feature measure |
|---|---|
| Cooccurrence matrix (7 features) | Second angular moment, contrast, entropy, homogeneity, dissimilarity, Inverse difference moment, correlation |
| Voxel-alignment matrix (11 features) | Short-run emphasis, long-run emphasis, intensity variability, run-length variability, run percentage, low-intensity run emphasis, high-intensity run emphasis, |
| low-intensity short-run emphasis, high-intensity short-run emphasis, low-intensity long-run emphasis, high-intensity long-run emphasis | |
| Neighborhood intensity difference matrix (5 features) | Coarseness, contrast, busyness, complexity, strength |
| Intensity size-zone matrix (11 features) | Short-zone emphasis, large-zone emphasis, intensity variability, size-zone variability, zone percentage, low-intensity zone emphasis, high-intensity zone emphasis, low-intensity short-zone emphasis, high-intensity short-zone emphasis, low-intensity large-zone emphasis, high-intensity large-zone emphasis |
| Normalized cooccurrence matrix (6 features) | Second angular moment, contrast, entropy, homogeneity, inverse difference moment, dissimilarity |
| Texture spectrum (2 features) | Max spectrum, Black-white symmetry |
| Texture feature coding (4 features) | Coarseness, homogeneity, mean convergence, variance |
| Texture feature coding cooccurrence matrix (8 features) | Second angular moment, contrast, entropy, homogeneity, intensity, inverse difference moment, correlation, variance, code similarity |
| Neighborhood gray-level dependence (5 features) | Small-number emphasis, large-number emphasis, number nonuniformity, second moment, entropy |
| SUV indices (49 features) | Minimum SUV, SUVmax, mean SUV, SUV variance, SUV SD, SUV skewness, SUV kurtosis, SUV skewness (and with bias corrected), SUV kurtosis (and with bias corrected), TLG, tumor volume, entropy, SULpeak, Surface area, Asphericity 1and 2 and 3, Surface mean SUV 1 and 2 and 3 and 4, Surface total SUV 1 and 2 and 3 and 4, Surface SUV entropy 1 and 2 and 3 and 4, Surface SUV variance 1 and 2 and 3 and 4, Surface SUV SD 1 and 2 and 3 and 4, Surface SUV NSR 1 and 2 and 3 and 4, SUVmean prod asphericity, SUVmax prod asphericity, Entropy prod asphericity, SULpeak prod asphericity, SUVmean prod surface area, SUVmax prod surface area, Entropy prod surface area, SULpeak prod surface area |