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Coronary computed tomography (CT) angiography can be associated with high radiation exposure. Reduction of tube voltage from 120 kV to 100 kV can reduce the dose by up to 40%, but it also increases image noise.We aimed to find a patient-specific predictor of image noise to determine the use of reduced tube voltage.Contrast-enhanced coronary dual-source CT angiography data sets [prospectively electrocardiogram...