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Ahnesjö et al (1992)

Med Phys

19, 263-73

In the same way, the dose to the central

axis from a square field, with side

s

,

can be

calculated by employing the equivalent

circle with

R

=0.561

·

s

.

calculation techniques:

A particular simple case is dose at the main axis for circular fields of radius

R

with

homogeneous energy fluence:

 

 

2

0 0

e

e

d

1 e

1 e

2

z

z

z

z

R

a r

b r

z

z

a R

b R

z

z

z

z

A B

D z

r r

r

A

B

D

z

a

b

 

Bjärngard and Siddon (1982).

Med Phys

9, 258-60