摘要
目的比较64排螺旋CT前瞻性心电门控(prospective ECG-gating)技术与回顾性心电门控(retrospectiveECG-gating)技术进行冠状动脉CTA(CCTA)检查的扫描时间、血管可评估率、图像质量及辐射剂量。方法133例疑似冠状动脉疾病的患者,分为两组:实验组68例:采用前瞻性心电门控技术成像;②对照组65例:采用回顾性心电门控技术成像。计算扫描时间、各段冠状动脉可评估率,同时进行图像质量评价,记录辐射剂量并进行统计学分析。结果平均扫描时间实验组为7.12s,对照组为9.43s;血管可评估率实验组为94.93%,对照组为94.46%;平均有效辐射剂量实验组(3.69mSv)比对照组(15.86mSv)降低77%;两组各段冠状动脉图像质量比较差异无统计学意义(P>0.05)。结论在64排螺旋CT冠状动脉成像中,与回顾性心电门控技术相比,前瞻性心电门控技术在保证血管可评估率及图像质量的前提下可降低77%的辐射剂量。
Objective To compare scan time,blood vessel assessability,image quality and radiation dosage between prospective ECG-gating and retrospective ECG-gating technique in coronary artery imaging with 64-detector spiral CT.Methods One hundred and thirty-three patients suspected coronary artery diseases were included and divided into experimental group（prospective ECG-gating coronary artery imaging,68 patients）and control group（retrospective ECG-gating coronary artery imaging,65 patients）.Scan time and radiation dosage were recorded for statistics,while blood vessel assessability was calculated and image quality was evaluated.Results The mean scan time was 7.12 s in the experimental group and 9.43 s in the control group.The percentage of assessable coronary artery segments was 94.93%（843/888）in the experimental group,whereas 94.46%（784/830）in the control group.The mean effective dosage（ED）in the experimental group was 3.69 mSv and 15.86 mSv in the control group.There was no significant difference of imaging quality between the two groups（P〉0.05）.Conclusion Sixty-four-detector row CT coronary angiography performed with prospective ECG-gating has similar image quality but lower patient radiation dose compared with that of retrospective ECG-gating.
出处
《中国医学影像技术》
CSCD
北大核心
2009年第11期2004-2008,共5页
Chinese Journal of Medical Imaging Technology
