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Effects of dual-source CT adaptive prospective ECG-gated free-heart rate coronary angiography on image quality and radiation dose
Pages: 488-493
Year: Issue:  5
Journal: Radiologic Practice

Abstract: Objective:To explore the effects of dual-source CT adaptive prospective ECG-gated coronary artery angiography on image quality and radiation dose.Methods:150 patients suffered from coronary artery disease with free heart rates (heart rate variability ≤ 5 times/min) were divided into A,B and C groups according to heart rates (group A,heart rate < 75bpm;group B,heart rate 75 ~ 90bpm;group C.hart rate > 90bpm).DSCT adaptive ECG-gated scanning was performed in all the patients.From them,13 cases from group A,18 cases from group B and 11 cases from group C underwent CAG within one week after CTCA.The evaluable rate of coronary segments (the number of evaluable segments/total segment number),radiation dose and image quality of the three groups were calculated.Using CAG as the gold standard,the sensibility,specificity,positive predictive value and negative predictive value of CTCA of the three groups for diagnosing coronary artery stenosis were calculated.Result:For coronary angiography (CTCA) of the three groups A,Band C,the coronary artery evaluation rate was respectively 97.6% (649/664),96.9% (928/958),5.2% (660/693),indicating no statistical significant difference (P > 0.05);CTCA image quality score of three groups were respectively (4.69 ±0.48),(4.56 ± 0.44),(4.74 ± 0.47),indicating no statistical significant difference (P > 0.05).The mean effective radiation dose of the three groups were (5.98 ± 0.19),(5.00 ± 0.18) and (4.10 ± 0.17)mSy,indicating statistically significant difference (P < 0.05).The Sensitivity,specificity,positive predictive value and negative predictive value of CTCA in diagnosis of coronary artery stenosis were 86.0%,94.0%,82.4%,95.2% in group A,90.5%,94.8%,83.8%,97.1% in group B and 84.4%,96.70%,90.5%,94.4%in group C respectively.Conclusion:The CTCA of free heart rate patients using dual source CT adaptive prospective ECG-gated technique can provide image quality meeting diagnostic requirements,and can accurately assess the degree of coronary artery stenosis.The radiation dose decreased with increasing heart rates.
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