Table 1 The target and the OARs constraint functions and dosimetric evaluation metrics
Site | Target/OARs | Prescription | Constraints or objectives | Dosimetric evaluation |
|---|---|---|---|---|
NPC | PTV70.4 | 70.4 Gy/32 F | D95 > Prescription, D2 < 110% Prescription, uniform dose = Prescription | V100, D95, D2 |
PTV66 | 66Â Gy/32 F | |||
PTV60 | 60Â Gy/32 F | |||
PTV54 | 54Â Gy/32 F | |||
Eyes | / | Max Dose < 50 Gy | Max Dose | |
Lens | / | Max Dose < 25 Gy | Max Dose | |
Brainstem | / | Max Dose < 54 Gy | Max Dose | |
Temporal lobes | / | Max Dose < 65 Gy, V60 < 1% | Max Dose | |
Spinal cord | / | Max Dose < 45 Gy | Max Dose | |
Optic nerves | / | Max Dose < 54 Gy | Max Dose | |
Larynx | / | Mean Dose < 45 Gy | Mean Dose | |
Parotid | / | Mean Dose < 26 Gy | Mean Dose, V30 | |
Oral cavity | / | Mean Dose < 40 Gy | Mean Dose | |
Temporomandibular joints | / | Max Dose < 70 Gy | Not evaluated | |
Chiasm | / | Max Dose < 54 Gy | Not evaluated | |
Rectum | PTV | 50 Gy/25 F | D95 > Prescription, D2 < 110% Prescription, uniform dose = Prescription | V100, D95, D2 |
Femoral heads | / | V40 < 40%, Max Dose < 50 Gy | Mean Dose | |
Bladder | / | V40 < 50% | Mean Dose, V40 |