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16

Source size effects, focused leafs

Fieldsize 5x5cm

2

Fieldsize 1x1cm

2

cm

2

10 10 cm

x

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!