A single-variable method for the derivation of collimator scatter correction factors in symmetrical and asymmetrical X-ray beams.
Using a minimal set of measured data, the collimator scatter correction factor of an asymmetrical collimated rectangular field (X1,X2;Y1,Y2) can be calculated from the product of one-dimensional factors, in combination with a correction term: Sc(X1,X2;Y1,Y2) = S(cx1)(X1)S(cx2)(X2)S(cy1)(Y1)S(cy2)(Y2) + c delta(X;Y). Two forms of the function delta(X;Y) were investigated.
Radiotherapy Department, Dr B. Verbeeten Institute, Tilburg, The Netherlands.
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Venselaar
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Beckers
D000465:Algorithms; D006801:Humans; D008962:Models, Theoretical; D010315:Particle Accelerators; D019047:Phantoms, Imaging; D017785:Photons; D011879:Radiotherapy Dosage; D020266:Radiotherapy, Conformal / Q000295:instrumentation / Q000379:methods*; D012542:Scattering, Radiation; D014965:X-Rays