Table 1 The prescription for all the plans.

From: The Hippocampus Sparing Volume Modulated Arc Therapy does not Influence Plan Quality on Locally Advanced Nasopharyngeal Carcinoma Patients

Tissue Name

For Target

For Organs at Risk

95% volume(Rx)

Volume of 110%Rx

1% volume

Dose volume constrict

Maximum dose

PTV

60

    

PTVnx

70

<2%

   

GTVnd

70

<2%

   

Spinal Cord

  

40

 

45

Lenses

    

8

Brain Stem

  

54

 

58

Chiasm

    

54

Optic Nerve

    

54

Larynx

   

V50% < 40 Gy

 

Parotid

   

V50% < 35 Gy

 

Middle ear

Hippocmapus

  C-VMAT

   

N/A

 

  HS-VMAT

   

V40% < 7.3 Gy

 

  HS-dMLC

   

V40% < 7.3 Gy

 
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