Table 3 Dose constraints of normal tissue. The biologically effective dose in 2 Gy fractions (BED2Gy) is calculated assuming an alpha/beta value of 2Gy for all normal tissues. ALARA As low as reasonable achievable. Dose constraints of can be exceeded in case of tumor involvement and with agreement of the patient
Organ at risk | Dose contraints | BED2Gy | |
|---|---|---|---|
Brain stem | 54Gy(RBE)/82% | 60Gy | Dmax superficial |
Chiasma | 49.5Gy(RBE)/75% | 52.6Gy | Dmax |
Optic nerves | 49.5Gy(RBE)/75% | 52.6Gy | Dmax |
Spinal cord | 45Gy(RBE)/68% | 45.3Gy | Dmax |
Parotid gland | 31Gy(RBE)/47% | 26.4Gy | Dmean |
Lower jaw | 60Gy(RBE)/90% | 69.8Gy | Dmax superficial |
Lens | ALARA | ||
Bulb | ALARA | ||
Lacrimal gland | ALARA | ||
Inner ear | ALARA | ||
Temporomandibular joint | ALARA |