Table 3.
Planning dose characteristics betweent patients with xerostomia and patients without xerostomia
| Parameter | 1Ref | Patients with xerostomia (n = 8) | Patients without xerostomia (n = 13) | P value |
|---|---|---|---|---|
| 2V20 (%) | NA | 79.1 ± 12.2 | 60.4 ± 23.6 | 0.06 |
| V30 (%) | NA | 35.8 ± 5.8 | 29.2 ± 16.8 | 0.08 |
| V40 (%) | NA | 20.3 ± 4.0 | 16.5 ± 12.2 | 0.16 |
| 3D50 (Gy) | 30 | 25.6 ± 2.1 | 22.6 ± 6.1 | 0.03 |
| Dmean (Gy) | 26 | 30.6 ± 2.9 | 26.3 ± 6.0 | <0.01 |
1Ref = parotid radiation tolerance.
2V20 = the percentage of parotid gland volume that received 20 Gy in the total parotid gland.
3D50 = dose to the 50% of the parotid gland.