Table 2 The dose-volume constraints to critical OARs used in VMAT optimization
OAR | Dose constraint |
|---|---|
Brain stem | D2% < 54 Gy |
Spinal cord | D2% < 45 Gy |
Parotid glands | Dmean < 26 Gy or at least 50% of one side will receive <30Gy |
Optic nerves, Chiasm | D2% < 54 Gy |
Temporal lobes | D2% < 60 Gy |
Oral cavity (excluding PTV’s) | Dmean < 40 Gy |
Lens | D2% < 10 Gy |
Glottic larynx | Dmean < 45 Gy |
Submandibular glands | Dmean < 39 Gy |
Pharyngeal constrictor muscles | Dmean < 50 Gy |