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Table 2 Gradient index GI 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

GI

  

Circular Collimator

MLC 0.5 cm (isocentric)

  

SID or SVID [cm]

100

70

50

100

70

50

∅ [cm]

Prescription

       

1.0

D80%

 

3.90

3.45

3.20

4.21

3.74

3.63

1.3

D70%

 

2.91

2.70

2.61

3.15

2.92

2.77

1.3

D80%

 

3.26

2.83

2.78

3.57

3.22

3.01

1.3

D90%

 

4.19

3.69

2.44

4.65

4.05

3.73

1.7

D80%

 

2.86

2.63

2.52

3.15

2.85

2.69

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Radiation Oncology

ISSN: 1748-717X

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