ESTRO course Dose Modelling and Verification 2017

150 / 1245

16
Source size effects, focused leafs
Fieldsize 5x5cm2
Fieldsize 1x1cm2
cm
2
10 10 cmx


Focused leafs (Siemens MLC geometry)
-5 -4 -3 -2 -1 0 1 2 3 4 5
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
-5 -4 -3 -2 -1 0 1 2 3 4 5
0.0
0.2
0.4
0.6
0.8
1.0
1.2
.
.
.
.
.
.
.
1.1
.
Source sizes
Point
0.35 cm
0.70 cm
When the source “fills” the “inverse” view we get dramatic
decrease in fluence output with increasing source size!