Table 3.
Numbers and percentages of features affected by the delineation method (VOIvital-tumour vs. VOIgross-tumour) per feature class for the subgroups based on NTF. Differences in the number of affected features between subgroups were assessed using the Fisher’s exact test. NTF: necrotic tumour fraction, GLCM: grey level cooccurrence matrix, GLRLM: grey level run length matrix, GLSZM: grey level size zone matrix, GLDM: grey level dependence matrix, NGTDM: neighbouring grey tone difference matrix.
| Feature Class | All (n = 43) |
Small NTF (NTF ≤ 0.12, n = 14) |
Medium NTF (0.12 < NTF ≤ 0.36, n = 15) |
Large NTF (NTF > 0.36, n = 14) |
p-Value |
|---|---|---|---|---|---|
| First order (18) | 17 (94%) | 14 (78%) | 16 (89%) | 14 (78%) | 0.745 |
| Shape (14) | 11 (79%) | 5 (36%) | 8 (57%) | 10 (71%) | 0.199 |
| Texture (73) | 58 (79%) | 52 (71%) | 60 (82%) | 51 (70%) | 0.170 |
| GLCM (22) | 15 (68%) | 13 (59%) | 15 (68%) | 15 (68%) | 0.850 |
| GLRLM (16) | 15 (94%) | 12 (75%) | 14 (88%) | 14 (88%) | 0.701 |
| GLSZM (16) | 12 (75%) | 12 (75%) | 15 (94%) | 9 (94%) | 0.058 |
| GLDM (14) | 12 (86%) | 10 (71%) | 11 (79%) | 11 (79%) | 1.000 |
| NGTDM (5) | 4 (80%) | 5 (100%) | 5 (100%) | 2 (40%) | 0.066 |
| Total (105) | 86 (82%) | 71 (68%) | 84 (80%) | 75 (71%) | 0.116 |