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(χ^2=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(χ^2=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.
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 [72.10±12.54]/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(χ^2 = 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 (χ^2 = 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.
出处
《中国医学影像技术》
CSCD
北大核心
2006年第10期1477-1480,共4页
Chinese Journal of Medical Imaging Technology