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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