Table 2.
Overall dosimetric parameters (Mean ± StandardDeviation)
| Structure | Parameter | All cases | Larynx | Oropharynx | Nasopharynx |
|---|---|---|---|---|---|
| Hypopharynx | Oral cavity | ||||
| PTV_69.96Gy | Volume [cm3] | 263 ± 147 | 233 ± 168 | 273 ± 141 | 273 ± 131 |
| Mean [Gy] | 69.96 | 69.96 | 69.96 | 69.96 | |
| D2% [Gy] | 72.5 ± 0.8 | 72.4 ± 0.7 | 72.5 ± 0.8 | 72.8 ± 0.9 | |
| D98% [Gy] | 65.3 ± 1.3 | 65.7 ± 1.0 | 65.3 ± 1.4 | 65.2 ± 1.0 | |
| Std.Dev. [Gy] | 1.7 ± 0.4 | 1.6 ± 0.3 | 1.7 ± 0.4 | 1.9 ± 0.5 | |
| PTV_54.45Gya | Volume [cm3] | 442 ± 198 | 459 ± 195 | 413 ± 181 | 477 ± 222 |
| Mean [Gy] | 56.2 ± 2.0 | 56.2 ± 1.6 | 56.3 ± 2.1 | 56.2 ± 2.1 | |
| D98% [Gy] | 50.9 ± 1.2 | 50.9 ± 1.1 | 51.0 ± 1.0 | 50.9 ± 1.6 | |
| Std.Dev. [Gy] | 2.8 ± 1.0 | 2.9 ± 0.9 | 2.8 ± 0.9 | 2.8 ± 1.0 | |
| Spinal Cord | D2% [Gy] | 36.2 ± 8.1 | 36.5 ± 5.4 | 34.6 ± 6.4 | 38.9 ± 11.5 |
| Brain Stem | D2% [Gy] | 34.3 ± 15.9 | 27.4 ± 12.9 | 29.1 ± 14.6 | 47.7 ± 11.3 |
| Constrictor inf. | Mean [Gy] | 48.6 ± 13.8 | 66.6 ± 4.9 | 44.3 ± 9.4 | 39.5 ± 10.6 |
| Constrictor mid. | Mean [Gy] | 59.2 ± 11.0 | 67.5 ± 5.1 | 58.8 ± 9.5 | 52.4 ± 12.3 |
| Constrictor sup. | Mean [Gy] | 62.9 ± 8.8 | 57.0 ± 9.1 | 66.1 ± 4.5 | 62.4 ± 11.1 |
| Oral Cavity | Mean [Gy] | 44.9 ± 8.2 | 37.4 ± 6.5 | 49.9 ± 6.2 | 43.0 ± 6.4 |
| V50Gy [%] | 40.5 ± 18.7 | 23.7 ± 12.5 | 52.6 ± 15.5 | 34.6 ± 12.8 | |
| Parotids | Mean [Gy] | 26.0 ± 7.2 | 22.5 ± 3.8 | 27.4 ± 8.0 | 26.6 ± 7.0 |
| Submandibulars | Mean [Gy] | 61.1 ± 10.0 | 59.2 ± 8.0 | 63.2 ± 8.1 | 59.3 ± 13.3 |
| Larynx | Mean [Gy] | 38.7 ± 9.0 | 51.6 ± 13.6b | 36.9 ± 7.5 | 38.1 ± 5.8 |
| Eyes | Mean [Gy] | 1.3 ± 0.2 | 1.2 ± 0.4 | 6.1 ± 6.8 | |
| Thyroid | Mean [Gy] | 43.9 ± 8.2 | 47.4 ± 9.4 | 43.0 ± 7.8 | 42.5 ± 6.7 |
asubtracting the PTV_69.96Gy volume
bonly hypopharyngeal tumours