Table 4.
Correlations between factors and Hausdorff distance in gross tumor volume
| PET | CT | MRI | |||||||
|---|---|---|---|---|---|---|---|---|---|
| No | HD (median ± SD)/ correlation coefficient (ρ) | p-value | No | HD (median ± SD)/ correlation coefficient (ρ) | p-value | No | HD (median ± SD)/ correlation coefficient (ρ) | p-value | |
| Primary site | |||||||||
| Oropharyngeal cancer | 4 | 0 | 1 | 4 | 1.24 ± 0.64 | 0.77 | 3 | 1.89 ± 1.20 | 0.36 |
| Other | 4 | 0 | 4 | 1.24 ± 0.40 | 5 | 0.73 ± 0.11 | |||
| Stage | |||||||||
| De novo | 5 | 0 | 1 | 5 | 1.22 ± 0.55 | 0.65 | 5 | 0.73 ± 0.12 | 0.36 |
| Recurrent | 3 | 0 | 3 | 1.26 ± 0.48 | 3 | 1.88 ± 1.20 | |||
| Dental artifacts and GTV on the same axial plane | |||||||||
| Yes | 4 | 0 | 1 | 4 | 1.17 ± 0.43 | 1 | 4 | 1.61 ± 1.10 | 0.3 |
| No | 4 | 0 | 4 | 1.30 ± 0.60 | 4 | 0.71 ± 0.13 | |||
| Size of GTV | ρ = 0.52 | 0.18 | ρ = 0.96 | 0.0001 | |||||
| Distance between dental artifacts and GTV | ρ = −0.26 | 0.53 | ρ = −0.31 | 0.44 | |||||
PET = positron emission tomography, CT = computed tomography, MRI = magnetic resonance imaging, HD = Hausdorff distance, GTV = gross tumor volume, SD = standard deviation