Table 4.
The NR1 Features (%Diff > 100%) for PET and CT.
| Subtype | Feature | 3D CT | 4D CT | 3D PET | 4D PET |
|---|---|---|---|---|---|
| Intensity | V40 | ✓ | ✓ | ||
| V70 | ✓ | ||||
| V80 | ✓ | ||||
| GLCM | Co-occurrence variance | ✓ | |||
| Cluster shade | ✓ | ||||
| RLM | LGRE | ✓ | |||
| SRLGE | ✓ | ||||
| LRLGE | ✓ | ||||
| GLSZM | SAE | ✓ | |||
| LAE | ✓ | ||||
| LIE | ✓ | ✓ | ✓ | ||
| LISAE | ✓ | ✓ | ✓ | ||
| HISAE | ✓ | ||||
| LILAE | ✓ | ✓ | ✓ | ||
| HILAE | ✓ | ✓ | |||
| IV | ✓ | ✓ |
Abbreviations: CT, computed tomography; 3D, 3-dimensional; 4D, 4-dimensional; GLCM, gray-level co-occurrence matrix; GLSZM, gray-level size zone matrix; HILAE, high-intensity large-area emphasis; HISAE, high-intensity small-area emphasis; IV, intensity variability; LAE, large-area emphasis; LGRE, low gray-level run emphasis; LIE, low-intensity emphasis; LILAE, low-intensity large-area emphasis; LISAE, low-intensity small-area emphasis; LRLGE, long run low gray-level emphasis; PET, positron emission tomography; RLM, run length matrix; SAE, small-area emphasis; SRLGE, short run low gray-level emphasis.