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Table 4 Summary of OAR doses

From: Radiotherapy of nasopharyngeal cancer using Rapidarc: dosimetric study of military teaching hospital Mohamed V, Morocco

OAR Parameter Dose constraintsa Mean ± SD
Spinal cord Dmax (Gy) ≤45 Gy 43.84 ± 3.68
Brainstem Dmax ≤54 Gy 54.65 ± 2.8
Chiasma Dmax <54 Gy 41.67 ± 22.88
Optic nerve
 Ipsilateral Dmax <54 Gy 42 ± 19.24
 Contralateral 41.26 ± 18.68
Parotid gland
 Ipsilateral Dmean (Gy) ≤26 Gy 42.66 ± 8.83
V30 (%) <50% 74.47 ± 24.04
V40 (%) ≤33% 49.71 ± 25.54
 Contralateral Dmean   39.77 ± 9.73
V30 (cm3) 66.01 ± 27.01
V40(%) 41.92 ± 23.88
Submandibular gland
 Ipsilateral Dmean   7.19 ± 2.45
 Contralateral Dmean 7.25 ± 2.25
Inner ear
 Ipsilateral Dmax <50 Gy 59.12 ± 8.31
 Contralaetral 57.32 ± 8.19
Temporo-mandibular joint
 Ipsilateral Dmax <60 Gy 62.01 ± 7.77
 Contralateral 58.26 ± 7.08
  1. aRTOG protocol 0225