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The ratio Hp(10) at C-arm/KAP vs kV for a sample of events for C-arm angles close to PA projection. Each point represents the average and standard deviation (of the sample) for radiation events with −10°< C arm angles < 10°. Minimum sample sizes were of 5 events (for no filter, kV > 100), 17 events (for no filter 90–100 kV) and 56 events (for no filter, kV <60). The rest of the points had sample sizes greater than 100 up to 7474 radiation events.
