10 MV x-ray SMRs obtained using zero-area S(p) correction factors derived by means of the Bjärngard-Petti method.
Based on the Khan concept, a new set of 10 MV x-ray scatter-maximum ratios (SMRs) has been produced. THese new SMRs reflect no electron contamination and are parametrized. A method has been developed for determining the minimum field size with lateral CPE (charged particle equilibrium) at the field centre. It is found that for 10 MV x-rays the minimum square field with lateral CPE at large depths on the central axis in water is 3.5 x 3.5 cm2. The zero-area phantom scatter correction factor (S(p)) is derived using the Bjärngard-Petti method. It is found that the effect of electron contamination is to reduce the zero-area Sp correction factor.
Iwasaki
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School of Allied Medical Sciences, Hirosaki University, Aomori, Japan.
D004583:Electrons; D006801:Humans; D008433:Mathematics; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011878:Radiotherapy; D012542:Scattering, Radiation; D014867:Water; D014965:X-Rays
D014867:Water