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Comparison of theoretical and experimental DE NPS for a range of experimental conditions. (a) Fixed high-energy beam, and varied low-energy beam for a constant tissue cancellation factor w = 0.5. (b) Fixed low-energy beam, and varied high-energy beam, also for a constant tissue cancellation factor w = 0.5. (c) Varying levels of w at fixed low- and high-energy beams (60 and 130 kVp).
