TABLE 1.
Overlapped radiomic feature groups regarding target materials for all motion amplitudes
| Feature groups (number of features) | Wavelet filters | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Unfiltered | LLL | LLH | LHL | HLL | HHL | LHH | HLH | HHH | |
| Shape (14) | 5 (35.7%) | – | – | – | – | – | – | – | – |
| First order (18) | 2 (11.1%) | 2 (11.1%) | 1 (5.6%) | 5 (27.8%) | 3 (16.7%) | 13 (72.2%) | 5 (27.8%) | 4 (22.2%) | 15 (83.3%) |
| GLCM (24) | 0 (0.0%) | 0 (0.0%) | 2 (8.3%) | 9 (37.5%) | 6 (25.0%) | 16 (66.7%) | 9 (37.5%) | 7 (29.2%) | 18 (75.0%) |
| GLDM (14) | 0 (0.0%) | 0 (0.0%) | 2 (12.5%) | 5 (31.3%) | 3 (18.8%) | 7 (43.8%) | 4 (25.0%) | 3 (18.8%) | 11 (68.8%) |
| GLRLM (16) | 0 (0.0%) | 0 (0.0%) | 2 (12.5%) | 5 (31.3%) | 4 (25.0%) | 6 (37.5%) | 5 (31.3%) | 5 (31.3%) | 6 (37.5%) |
| GLSZM (16) | 1 (7.1%) | 0 (0.0%) | 2 (14.3%) | 7 (50.0%) | 3 (21.4%) | 6 (42.9%) | 5 (35.7%) | 5 (35.7%) | 7 (50.0%) |
| NGTDM (5) | 2 (40.0%) | 2 (40.0%) | 2 (40.0%) | 4 (80.0%) | 4 (80.0%) | 4 (80.0%) | 3 (60.0%) | 3 (60.0%) | 3 (60.0%) |
Note: Each value represents the number of robust features (percentage) of the target materials.
Abbreviations: GLCM, gray‐level co‐occurrence matrix; GLDM, gray‐level dependence matrix; GLRLM, gray‐level run‐length matrix; GLSZM, gray‐level size‐zone matrix; NGTDM, neighboring gray‐tone difference matrix.