Table 2.
Number of radiomics features extracted for different feature classes and image filters.
| Filter/features | First-order | GLCM | GLDM | GLRLM | GLSZM | NGTDM | Shape | Total |
|---|---|---|---|---|---|---|---|---|
| Exponential | 16 | 0 | 11 | 12 | 7 | 0 | 0 | 46 |
| Gradient | 18 | 23 | 14 | 16 | 16 | 5 | 0 | 92 |
| lbp | 56 | 0 | 44 | 48 | 28 | 0 | 0 | 176 |
| Logarithm | 18 | 23 | 14 | 16 | 16 | 5 | 0 | 92 |
| Original | 18 | 23 | 14 | 16 | 16 | 5 | 12 | 104 |
| Square | 18 | 23 | 14 | 16 | 16 | 4 | 0 | 91 |
| Squareroot | 18 | 23 | 14 | 16 | 16 | 5 | 0 | 92 |
| Wavelet | 144 | 184 | 112 | 128 | 128 | 39 | 0 | 735 |
| Total | 306 | 299 | 237 | 268 | 243 | 63 | 12 | 1428 |
GLCM grey level co-occurrence matrix, GLDM grey level difference matrix, GLRLM grey level run length matrix, GLSZM gray level size zone, NGTDM neighboring gray tone difference matrix.