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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:

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

irregularly shaped fields

S

r

5611

.0

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)

Phantom scatter: equivalent square of a circular field