Dose Course 2018_Flipping book

Phantom scatter: equivalent square of a circular field

The equivalence between a square field and a circular field has be shown to be:

Bjärngard and Siddon Med Phys 9(2), (1982)

r

S

=

.0

5611

This equation can be implemented in sector integration algorithms to calculate the equivalent square of irregularly shaped fields

Sector integration Clarkson (1941)BJR 14 265-8, Cunningham et al 1972 Comp Prog Biomed 2 192-199

Triangular decomposition Siddon et al (1985), Med Phys 12(2)