Imaging for early stage breast cancer

Effect of inverse square law on dose

110

100

Ref. point distance = 100 cm

90

Teletherapy

80

70

Ref. point

D=100 %

60

source

50

40

ref. point distance

distance

30

Brachytherapy

20

Realative dose value (%)

10

Ref. point distance = 1 cm

0

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0

Distance from reference point (cm)