Fig. 1. Schematics of the geometrical relationship between the jaws and multi-leaf collimators (MLCs) in terms of the beam’s eye view, detector’s eye view, and scatter interface for (a) unaffected area, (b) affected area, and (c) head scatter factor (Sc) as a function of the MLC-defined square field size ranging from 4×4 to 15×15 cm2 at a fixed jaw setting of 15×15 cm2. The calculated Sc values are derived from the dual-source model.
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