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Page Background

• To quantify variations in energy fluence

incident on the patient

• Function of the collimator

setting

• Depends on the photon beam quality and

on treatment head design

• Depends on the field orientation for

rectangular beams (CEE)

• Almost independent of the

source-detector distance

• Does not depend on depth

if z > R contam. electrons

Summary: in-air output ratio, Sc

isocentric conditions

E lekta

P rec is e

0,93

0,95

0,97

0,99

1,01

1,03

1,05

0 5 10 15 20 25 30 35 40

S quare F ield s iz e [c m]

O

O

6 MeV

10 MeV

25 MeV

6 MeV

0,94

0,96

0,98

1,00

1,02

1,04

1,06

1,08

1,10

0 5 10 15 20 25 30 35 40

S quare F ie ld s iz e [cm]

O

O

E lekta P rec is e (ML C )

G E S at 43 (ML C )

G E S at 43 (C C )