|
Structures
|
Planning objectives
|
|---|
|
PTV70
|
V70 ≥ 95%,D1% ≤ 77Gy
|
|
PTV66
|
V66 ≥ 95%
|
|
PTV60
|
V60 ≥ 95 %
|
|
Brain stem
|
D1% < 60Gy
|
|
Spinal cord
|
D1% < 45Gy
|
|
Optic nerves
|
D1% < 50Gy
|
|
Lens
|
D1% < 10Gy
|
|
Larynx
|
Dmean < 40Gy
|
|
Oral cavity
|
Dmean < 40Gy
|
|
Parotid glands
|
Dmean < 40Gy
|
|
Normal tissue
|
as low as possible
|
- Abbreviations: PTV70 = planning target volume of the primary nasopharyngeal tumor; PTV66 = planning target volume of involved regional lymph nodes; PTV60 = planning target volume receiving 60 Gy; V
D
= the percentage volume of the PTV at the prescribed dose and D was the prescribed dose; D
1%
= dose received by 1% of the volume.
