Skip to main content

Table 1 Planning objectives for organs at risk and target volumes

From: A treatment planning study comparing Elekta VMAT and fixed field IMRT using the varian treatment planning system eclipse

Organ at risk

Maximum dose

Dose volume parameter

Brain

63 Gy

 

Brainstema

54 Gy

 

Chiasmb

53 Gy

 

Lens

3 Gy

 

Optical nerveb

50 Gy

 

Lips

45 Gy

 

Parotid glands

 

V28 Gy < 50%

Spinea

45 Gy

 

Lung

 

V20 Gy < 20%; Dmean < 15 Gy

Lungs, both

 

V5 Gy < 65%; V20 Gy < 20%; Dmean < 13 Gy

Heart

 

V30 Gy < 20%; Dmean < 15 Gy

Small intestine

 

V45 Gy < 78 cm3

Bladder

 

V40 Gy < 55%; V60 Gy < 25%; V70 Gy < 5%

Rectum

 

V40 Gy < 60%; V60 Gy < 40%; V70 Gy < 20%

PTV1

110%c

V95% > 95%

PTV2 and PTV3 (sub-dose levels)

110%c

V95% > 95%; D50% in [98.5% - 101.5%]c

  1. Note: PTV = planning target volume; V95% = volume of PTV receiving 95% of prescription; D50% = median dose; Vn Gy = volume of structure receiving ≥ n Gy; aobjectives are to be counted including an additional margin of 5 mm, bobjectives are to be counted including an additional margin of 3 mm; cin relation to the prescribed dose.