Dose Course 2018_Flipping book

Factor-based dose calculations basic dosimetric quantities

1,20

Phantom scatter factor, S p 1,15

1,20

1,10

4cm x 4cm 6cm x 6cm 8cm x 8cm

1,15

1,05

1,10

S p

15cm x 15cm 20cm x 20cm 30cm x 30cm 40cm x 40cm

4cm x 4cm 6cm x 6cm 8cm x 8cm

1,00

1,05

0,95

35%

S p

15cm x 15cm 20cm x 20cm 30cm x 30cm 40cm x 40cm

13%

1,00

0,90

0,95

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

0,85

0,90

0,55

0,60

0,65

0,70 8-10%

0,75

0,80

0,85

Quality Index

0,55

0,60

0,65

0,70

0,75

0,80

Quality Index

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