| 李颖,杨立,刘新,王新疆,赵锡海.心率对64层螺旋CT冠状动脉成像质量的影响[J].中国医学影像技术,2006,22(10):1477~1480 |
| 心率对64层螺旋CT冠状动脉成像质量的影响 |
| Noninvasive coronary angiography with 64-slice spiral CT: effect of heart rate |
| 投稿时间：2006-06-23 修订日期：2006-09-27 |
| DOI： |
| 中文关键词: 体层摄影术,X线计算机 冠状动脉疾病 冠状动脉造影 |
| 英文关键词:Tomography, X-ray computed Coronary disease Coronary angiography |
| 基金项目: |
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| 中文摘要: |
| 目的 评价心率对64层螺旋CT冠状动脉成像质量的影响。方法 对260例行64层CT冠状动脉CTA检查的连续病例进行分析评价,心率为46~113次/min,平均(72.10±12.54)次/min。应用1~4级评分标准进行图像质量评分,统计检查成功率(评分2以上)和图像优良率(评分3以上),比较心率为<60次/min、60~69次/min、70~79次/min、80~89次/min和≥90次/min 时冠脉图像质量与心率的关系。同时分析不同心率下图像重建时相选择。统计分析心率与成像质量的关系以及不同心率时,冠脉检查成功率、显示优良率和重建心动周期时相的差异。结果 260名受检者,冠状动脉显示成功率为99.26％(2581/2600),显示优良率为88.69％(2306/2600)。心率与成像质量呈负相关(r=-0.92)。心率<70次/min与心率≥70次/min者在显示优良率方面存在显著性差异(χ2=44.68,P<0.01)。心率<80次/min,重建时相以舒张中期(50%~75%)为主,心率≥80次/min,重建时相以收缩末期(25%~45%)为主(χ2=98.88,P=0.000)。结论 心率与冠状动脉成像质量明显相关,64层螺旋CT在高心率下可以获得达诊断标准冠脉图像,心率在70次/min以下图像质量较高。 |
| 英文摘要: |
| Objective To evaluate the effect of heart rate on the quality of coronary angiography performed by 64-slice spiral CT. Methods Two hundreds and sixty consecutive patients underwent CT coronary angiography (heart rate range, 46~113/min, mean /min). Five groups were designed according to the heart rate (<60, 60~69, 70~79, 80~89 and >90/min). Image quality of each segment was graded with a four-point scale from one (worst image quality) to four (best image quality). Images scored between two and four were considered valuable for coronary artery assessment; those with a score of 3 or 4 were excellent images. The heart rate, image quality and reconstruction phase were evaluated. Results Two thousands five hundreds and eight-one segments diagnostic images were available from 2600 coronary segments (99.26％), while 2306 (88.69％) of them were excellent images. A significant negative correlation was observed between heart rate and image quality (r=-0.92). Significant differences of excellent images were shown between heart rate lower and higher than 70/min(χ2=44.68, P<0.01). Reconstruction phase at mid-diastolic (50%-75%) and end-systolic phase (25%-45%) yielded the best images when heart rates were lower and higher than 80/min, respectively (χ2=98.88,P=0.000). Conclusion Diagnostic coronary artery images can be obtained at high heart rates with 64-slice spiral CT scanners, but image quality was negatively correlated with heart rate, and excellent image can be achieved as heart rates less than 70/min. |
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