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Table 3 Volume of 66.7% (V66.7%) of prescription dose for investigated constellations

From: Finer leaf resolution and steeper beam edges using a virtual isocentre in concurrence to PTV-shaped collimators in standard distance – a planning study

V66.7%

  

Circular Collimator

MLC 0.5 cm (isocentric)

  

SID or SVID [cm]

100

70

50

100

70

50

[cm]

Prescription

       

1.0

D80%

 

1.87

1.58

1.44

2.09

1.73

1.50

1.3

D70%

 

3.01

2.62

2.44

3.30

2.87

2.57

1.3

D80%

 

3.58

3.12

2.89

3.98

3.34

3.11

1.3

D90%

 

4.62

4.22

3.88

5.06

4.28

4.00

1.7

D80%

 

6.34

5.72

5.38

7.05

6.08

5.67