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Factor-based dose calculations basic dosimetric quantities

Phantom scatter factor, S

p

0,85

0,90

0,95

1,00

1,05

1,10

1,15

1,20

0,55

0,60

0,65

0,70

0,75

0,80

Quality Index

S

p

4cm x 4cm

6cm x 6cm

8cm x 8cm

15cm x 15cm

20cm x 20cm

30cm x 30cm

40cm x 40cm

0,85

0,90

0,95

1,00

1,05

1,10

1,15

1,20

0,55

0,60

0,65

0,70

0,75

0,80

Quality Index

S

p

4cm x 4cm

6cm x 6cm

8cm x 8cm

15cm x 15cm

20cm x 20cm

30cm x 30cm

40cm x 40cm

35%

13%

8-10%

Georg et al 1999, PMB 44, 2987-3007; Sätherberg et al 1996, PMB 41, 2687-2694)

Published data on

phantom scatter factors

can - as a function of

FS and QI - be in

general used instead of

performing

measurements for each

treatment unit

individually