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92.0

94.0

96.0

98.0

100.0

102.0

104.0

106.0

108.0

110.0

0 5 10 15 20 25 30 35 40

% Output Factor

Field size [cm]

51

31-08-16

Correction for Field Size

Careful: PDD and TMR also change with field size!

“The larger the scatter contribution, less MU need to be given”

D(z,c)

D

R

*

O

R

(c)

*TPR(z,c)

MU=

·

>100%

<100%