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Figure 3 :Comparison of percentage dose estimates (%DRs) in water, at (a) 0.25 mm (b) 0.75 mm and (c) 1.25 mm from the air-water interfaces for single fi eld (SF), parallel opposed (POP) and four fi eld (4F) techniques for 1x1x1 cm3 air cavity. Please see Figure 1 for the “dose points” indicated to represent the location of the interface dose calculation points (at 0.25, 0.75 and 1.25 mm from the interface (not to scale)).

Figure 3 :Comparison of percentage dose estimates (%DRs) in water, at (a) 0.25 mm (b) 0.75 mm and (c) 1.25 mm from the air-water interfaces for single fi eld (SF), parallel opposed (POP) and four fi eld (4F) techniques for 1x1x1 cm3 air cavity. Please see Figure 1 for the “dose points” indicated to represent the location of the interface dose calculation points (at 0.25, 0.75 and 1.25 mm from the interface (not to scale)).