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Abstract Objective To investigate the influence of prospective narrow window scan on the image quality and radiation dose of coronary 320- MDCT angiography in patients with high heart rate. Methods 80 patients with heart rate between 80 and 100 bpm were randomly divided into observation group and control group. Prospective scanning with an ECG- gated window of 30- 50%of the R- R interval was performed in observation group and 30- 80% of the R- R interval gated routine scan was acquired in control group in three heartbeats. Coronary artery image was scored using 4- point scale. The radiation dose was automatically calculated by the CT scanner. Results There was no significant difference of assessable coronary segments and excellent rate between two groups. The image quality scores of total coronary segments, RCA, LM, LAD and LCX were not significant difference between two groups. The image quality score of RCA and LCX was negatively correlated with rhythm variation in observation group (r=0.41, 0.47). The effective dose was significantly lower in observation group than in control group [(7.63 ± 3.29) mSv vs.(12.85 ± 2.71)mSv, P<0.05]. Conclusion Narrow window technology may reduce radiation dose without influencing the image quality of coronary 320- MDCT angiography for patients with high heart rate and less rhythm variation.
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