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PURPOSE: To evaluate the effect of 4 different scanning protocols(bolus-tracking technique,test-bolus technique,fixed delay METHOD AND MATERIALS: Eighty consecutive children(48 boys; mean age of 3.5 years; mean heart rate: 97 bpm)with known or suspe All patients were assigned to 4 groups randomly according to the different enhanced scanning protocols: bolus-tracking techniqu Subjective image quality was independently assessed by two radiologists.The total effective dose(including premonitoring,mon RESULTS: All prospective ECG-triggering DSCT angiographic scans were successful.The image quality scores of groups A,B,C and CONCLUSION: The scanning protocol has a significant impact on the image quality with a significantly different radiation dose.