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Background:Nonfluoroscopic three-dimensional electroanatomical system is widely used nowadays,but X-ray remains indispensable for complex electrophysiology procedures.This study aimed to evaluate the value of optimized parameter setting and different projection position to reduce X-ray radiation dose rates.Methods:From June 2013 to October 2013,105 consecutive patients who underwent complex ablation were enrolled in the study.After the ablation,the radiation dose rates were measured by two different settings (default setting and optimized setting) with three projection positions (posteroanterior [PA] projection;left anterior oblique [LAO] 30° projection;and LAO 45° projection).The parameter of preset voltage,pulse width,critical voltage,peak voltage,noise reduction,edge enhancement,pulse rate,and dose per frame was modified in the optimized setting.Results:The optimized setting reduced radiation dose rates by 87.5％ (1.7 Gy/min vs.13.6 Gy/min,P ＜ 0.001) in PA,87.3％ (2.5 Gy/min vs.19.7 Gy/min,P＜0.001) in LAO 30°,85.9％ (3.1 Gy/min vs.22.1 Gy/min,P ＜ 0.001) in LAO 45°.Increase the angle of projection position will increase the radiation dose rate.Conclusions:We can reduce X-ray radiation dose rates by adjusting the parameter setting of X-ray system.Avoiding oblique projection of large angle is another way to reduce X-ray radiation dose rates.