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Bjärngard and Siddon Med Phys 9(2), (1982)
The equivalence between a square field and a circular field has be shown to be:
S
r
5611 .0
=
Phantom scatter: equivalent square of a circular field
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)