Two types of phantom scatter correction factors for high-energy photons

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Abstract
Two types of phantom scatter correction factors are introduced for high-energy photons. One is the traditional correction factor. It is produced using the primary absorbed dose under lateral CPE (charged particle equilibrium). It usually takes a non-zero value at zero-area field. The other is produced using the actual primary absorbed dose, which fails in lateral CPE when the field is small. It takes a value of zero at zero-area field. The two types of correction factors can be connected with the laterally spread primary absorbed dose (LSD).