Two types of phantom scatter correction factors (Sp) for high-energy photons.
Two types of phantom scatter correction factors (Sp) are introduced for high-energy photons. One is the traditional Sp 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 Sp correction factors can be connected with the laterally spread primary absorbed dose (LSD).
Iwasaki
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School of Allied Medical Sciences, Hirosaki University, Aomori, Japan.
D006801:Humans; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D017785:Photons; D011882:Radiotherapy, High-Energy; D012542:Scattering, Radiation; D014965:X-Rays