心电脉冲窗的优化在胸痛三联排查中的应用  

The application of optimized ECG-pulsing window in triple-rule-out CT angiography

作　　者：王敏[1] 郭美玲[1] 李剑[1] 

机构地区：[1]济宁市第一人民医院CT室,山东济宁272111

出　　处：《实用放射学杂志》2014年第2期306-309,共4页Journal of Practical Radiology

摘　　要：目的 探讨心电脉冲窗的优化对胸痛三联排查（triple-rule-out,TRO）图像质量及辐射剂量的影响.方法 将80例拟行回顾性心电门控TRO的患者依据心率及心电脉冲窗的范围分为A1（心率＜70次/min; 30％～70％ R-R间期）、B1（心率＜70次/min;60％～75％R-R间期）、A2（心率＞80次/min;30％～70％ R-R间期）、B2（心率＞80次/min;30％～50％ R-R间期）4组,每组20例.2名研究者采用4分法评价4组图像质量.记录剂量长度乘积（DLP）,计算有效剂量（ED）.采用t检验比较A1与B1、A2与B2组的图像质量和辐射剂量.结果 A1与B1组、A2与B2组图像质量评分差异均无统计学意义（P＞0.05）.B1组有效剂量较A1组降低约28.50％,B2组有效剂量较A2组降低约16.01％,差异均有统计学意义（P＜0.05）.结论 心电脉冲窗的优化可以获得满足诊断要求的图像,且辐射剂量明显降低,在TRO低剂量扫描中具有重要价值.Objective To investigate the effect of optimized ECG-pulsing window on image quality and radiation dose at triple rule-out CT angiography （TRO-CTA）.Methods 80 patients requiring TRO-CTA were averagely assigned to four groups according to HR and the range of ECG-pulsing window：group A1 （HR＜70 beats/min and 30％ ～70％ R R interval）,group B1 （HR＜70 beats/minand 60％ ～75％ R-R interval）,group A2 （HR＞80 beats/min and 30％ ～70％ R-R interval） and group B2 （HR＞80 beats/min and 30％ ～50％ R-R interval）.Image quality was assessed by two observers using a four-point scale.Estimation of effec tive dose （ED） was performed on the basis of dose length product （DLP）.Image quality and radiation dose were compared with t test between A1and B1,A2 and B2,respectively.Results There was no difference on image quality between A1 and B1,and between A2 and B2,but the effective dose was decreased by 28.50％for B1 and by 16.01％for B2 using optimized ECG-pulsing window.Conclusion Optimized ECG-pulsing window can provide diagnostic image quality at reduced radiation dose and has a great value in low-dose TRO-CTA.

关 键 词：计算机体层成像 胸痛 辐射剂量 心电门控 

分 类 号：R814.42[医药卫生—影像医学与核医学] R561[医药卫生—放射医学]