摘要
目的选择双源CT冠状动脉的最佳重建期相,比较全期相固定间隔重建技术与自动化最佳期相选择技术所选择的最佳冠状动脉影像质量。方法对107例病人进行了双源CT冠状动脉血管成像。原始数据经多期相重建和自动化重建优选出最佳收缩期和舒张期影像,以4分法评定系统进行影像质量评价。按照美国心脏病协会的冠状动脉分段原则进行分段。比较上述2种技术最佳收缩期和舒张期的影像质量。结果最佳的影像质量位于R-R间期的70%(平均评分3.11),次之为R-R间期的75%(平均评分3.06)、再之为35%(平均评分为3.03)。自动化期相选择的最佳收缩期影像的平均评分为3.05,舒张期影像质量的平均评分为3.08。2组之间总的冠状动脉影像质量的差别没有统计学意义。按照15个冠状动脉节段计算,除了4段外,其余14个冠状动脉节段对于2种技术显示的冠状动脉影像质量的差别均无统计学意义。结论最佳舒张期和收缩期的影像质量位于R-R间期的70%和35%。自动化最佳收缩期和舒张期重建技术可以获得优良的影像质量,满足临床诊断的需要,但仍需要结合多期相重组技术。
Objective The purpose of this study was to evaluate the optimal reconstruction phase of dual-source CT coronary angiography （CTCA）, and to compare image quality of CTCA using automatic optimal phase selection technique and whole phase reconstruction. Methods 107 patients underwent CTCA. Optimal systolic and diastolic coronary arteries were selected automatically, image quality was scored using four-score method. Coronary arteries were segmented according to the guideline of American Heart Association. Image quality of CTCA using both techniques was compared. Results Optimal image quality of CTCA was acquired at the 70% of R-R interval （average score of 3.11）, followed by 75% and 35% of R-R interval （average scores of 3.06 and 3.03, respectively）. Average score of optimal systolic phase was 3.05; while average score of optimal diastolic phase was 3.08. There was no significant difference between both techniques. On the basis of per-segment, there was significant difference of image quality in segment 4 （P value of less than 0.05）. On the basis of coronary artery, there was no significant difference between both techniques. Conclusion Optimal diastolic and systolic image quality of CTCA was acquired at the 70% and 35% of R-R interval. Automatic optimal phase selection technique can satisfy clinical demands because of its sufficient image quality; however, its combination of whole phase reconstruction technique is necessary.
