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Factor-based dose calculations basic dosimetric quantities
Phantom scatter factor, S
p
1,15
1,20
4cm x 4cm
6cm x 6cm
0,90
0,95
1,00
1,05
1,10
S
p
8cm x 8cm
15cm x 15cm
20cm x 20cm
30cm x 30cm
40cm x 40cm
35%
13%
Published data on
phantom scatter factors
can - as a function of
0,85
0,55
0,60
0,65
0,70
0,75
0,80
Quality Index
8-10%
Georg et al 1999, PMB 44, 2987-3007; Sätherberg et al 1996, PMB 41, 2687-2694)
FS and QI - be in
general used instead of
performing
measurements for each
treatment unit
individually