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Table 2 The dose-volume constraints to critical OARs used in VMAT optimization

From: A new strategy for volumetric-modulated arc therapy planning using AutoPlanning based multicriteria optimization for nasopharyngeal carcinoma

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
  1. Abbreviations: D 2% dose to 2% of the structure, D mean mean dose