【摘要】 目的探讨双源CT冠状动脉成像检查中心率对影像质量的影响。方法对临床拟诊冠心病206例及24例健康体检者以不同心率分组行双源CT冠状动脉成像,应用增强扫描的数据选择最佳时相重建,再将重建影像进行多平面重组(MPR)、最大密度投影(M IP)及容积再现技术(VRT),将后处理影像按冠状动脉分段标准评价各节段影像质量并分析不同心率对最佳时相的选择及影像质量的影响,评价不同心率组之间冠脉节段质量。结果①≤60次/分心率组与61~80次/分心率组、61~80次/分心率组与81~99次/分心率组、81~99次/分心率组与≥100次/分心率组影像质量构成比差异均无显著性意义(Z值分别为-0.597、-1.656、-1.627,P值分别为0.551、0.098、0.104),而≤60次/分心率组与≥100次/分心率组的影像质量构成比差异有显著性意义(Z=-2.94,P=0.003);②4组心率组影像质量可评价率均达到97.5%以上,优良显示率达90%以上,不可评价率≤2.33%;③最佳时相的选择上,低心率组以舒张期时相(65%~85%)为最佳;中心率组以舒张期单时相(65%~85%)及舒张期和收缩期(30%~50%)双时相重建为主;高心率组则以收缩末期(40%~50%)为主。结论通过最佳时相的不同选择,不同心率组双源CT冠脉成像均达到满意的影像质量,心率快慢不再是影响双源CT冠脉成像质量的主要因素。更多还原

【Abstract】 Objective to explore the influence of heart-rate to imaging quality of coronary artery imaging examination with dual-source CT.Methods 230 cases with suspected coronary artery disease were divided into four-groups based on heart-rate and undergone coronary artery imaging examination with dual-source CT,select the best-phase in cardiac cycle and reconstructed the database based to enhanced scanning with dual-source CT.after that,the imaging would be rebuilt again in style MPR,MIP or VRT.At last,quality of these imaging would be evaluated according to Standard of coronary artery section.Influence of different heart-rate to imaging quality was also explored.Results ① There was no significant difference between(≤60 group and 61-80 group,so was between 61-80 group and 81-99 group,81-99 group and ≥100 group,(Z is separately-0.597,-1.656,-1.627,P is separately 0.551,0.098,0.104);there was significant difference between ≤60 group and ≥100 group,(Z is-2.94,P is 0.003).② four groups imaging quality all reached successful rate above 97.5%,better and best imaging occupied above 90%,imagings which could not been evaluated occupied less than 2.33%.③ The best phase’ selecting in low heart-rate group is more in diastolic phase(65%~85%) than in other phase.In middle heart-rate groups,the best phase is mostly in diastolic phase(65%~85%),partly in systolic phase(30%~50%) and diastolic phase,the best phase of high heart-rate group is mostly in systolic phase(40%~50%).Conclusions Through the selecting of best phase,coronary artery imaging of different heart-rate groups with dual-source CT all arrived satisfied imaging quality.Heart-rate is not a key influence factor in coronary artery imaging examination with dual-source CT.更多还原