| 晏子旭,张兆琪,徐磊,范占明,杨琳,李志敏,郭淼,肖金利.双源CT低管电压降低冠状动脉CTA辐射剂量[J].中国医学影像技术,2009,25(9):1614~1616 |
| 双源CT低管电压降低冠状动脉CTA辐射剂量 |
| Low tube voltage in reduction of radiation dose in dual-source CT coronary angiography |
| 投稿时间：2009-02-26 修订日期：2009-05-13 |
| DOI： |
| 中文关键词: 体层摄影术,X线计算机 冠状动脉 低辐射剂量 |
| 英文关键词:Tomography, X-ray computed Coronary artery Low radiation dose |
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| 中文摘要: |
| 目的 观察低管电压在体质指数(BMI)正常范围患者双源CT冠状动脉成像(CTA)中的应用,并评价其图像质量。方法 将65例BMI在正常范围并接受冠状动脉CTA检查的患者随机分为两组,A组管电压采用常规扫描120 kV,B组管电压采用100 kV,均采用回顾性心电门控螺旋扫描。对两组扫描的冠状动脉分别做图像处理,应用秩和检验比较两组患者冠状动脉段图像质量总体评分,两独立样本t检验比较两组患者的辐射剂量和对比剂用量。 结果 A组评价443段冠状动脉,B组评价451段冠状动脉。A组图像质量评价为优和良好的占97.74%,B组占97.56%。冠状动脉段图像质量评分两组之间比较差异无统计学意义(P=0.126)。A组平均有效剂量为(15.04±2.42)mSv;B组平均有效剂量为(7.95±1.69)mSv,差异有统计学意义(P＜0.001)。A组对比剂用量为(75.17±3.69)ml,B组对比剂用量为(62.27±3.42)ml,差异有统计学意义(P＜0.001)。 结论 对于BMI在正常范围内的患者,冠状动脉CTA检查时管电压设为100 kV可在保证图像质量的同时显著降低辐射剂量和对比剂用量。 |
| 英文摘要: |
| Objective To investigate the application of low tube voltage for dual-source CT coronary angiography (CTCA) in patients with normal body mass index (BMI). Methods Sixty-five patients with normal BMI who underwent CTCA were divided into group A and B with tube voltage of 120 kV and 100 kV, respectively, and retrospective ECG-gating helical scan with a dual source CT scanner (Somatom Definition). All images were transferred to a workstation for further processing and analysis. The imaging quality of coronary artery segments was compared with rank sum test, and the radiation dose was compared with t-test between the two groups. Results A total of 443 coronary artery segments were evaluated in group A and 451 segments were evaluated in group B. There was no statistical difference in imaging quality between the two groups (P=0.126). The effective dose was (15.04±2.42) mSv in group A, (7.95±1.69) mSv in group B (P＜0.001), while the volume of contrast medium administrated was (75.17±3.69) ml in group A, (62.27±3.42) ml in group B (P＜0.001). Conclusion Tube voltage of 100 kV in dual-source CTCA is feasible in patients with normal BMI. This scan mode can substantially reduce radiation doses and contrast medium while preserve good diagnostic image quality. |
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