Table 5.
Radiomic features extracted from T2w sequence and their descriptions.
| Category | Feature name | Feature description |
|---|---|---|
| Morphology14,19 | Margin sharpness | Mean of the image gradient at the lesion margin |
| Variance of margin sharpness | Variance of the image gradient at the lesion margin | |
| Variance of radial gradient histogram | Degree to which the enhancement structure extends in a radial pattern originating from the center of the lesion | |
| Texture14,22 | Contrast | Location image variations |
| Correlation | Image linearity | |
| Difference entropy | Randomness of the difference of neighboring voxels’ gray levels | |
| Difference variance | Variations of difference of gray level between voxel pairs | |
| Angular second moment (energy) | Image homogeneity | |
| Entropy | Randomness of the gray levels | |
| Inverse difference moment (homogeneity) | Image homogeneity | |
| Information measure of correlation 1 | Nonlinear gray-level dependence | |
| Information measure of correlation 2 | Nonlinear gray-level dependence | |
| Maximum correlation coefficient | Nonlinear gray-level dependence | |
| Sum average | Overall brightness | |
| Sum entropy | Randomness of the sum of gray-level dependence | |
| Sum variance | Spread in the sum of the gray-levels of neighboring voxels | |
| Sum of squares (variance) | Spread in the gray-level distribution | |
| Gray-level statistics14 | Mean voxel value | Average gray-level intensity within the lesion |
| Variance of voxel value | Variation in gray-level intensity within the lesion |