Abstract:

Objective To investigate the effect of resistance index of X-strain imaging (XS) in evaluating carotid plaque motility. Methods A total of 49 patients with carotid atherosclerotic plaque formation were selected for XS from March 2015 to June 2016. And the patients were divided into high-resistance index group and low-resistance index group according to the internal artery blood flow resistance index. The strain and movement characteristics of carotid plaques were compared in different positions between the two groups. Results There was no significant difference in carotid plaque size between the high-resistance index group and low-resistance index group. The movement of the plaque in the high-resistance index group was more obvious than the low resistance index group. The difference between the two group at the top of the plaque was statistically significant (P <0.05). There was no statistically significant difference between the movement of plaque in proximal part and the distal part (P >0.05). Conclusion Resistance index could affect carotid plaque movement. The plaque movement became more obvious when resistance index increased.

Key words: Carotid plaque; X-strain imaging; Ultrasound; Movement

摘要：

目的 探讨阻力指数对斑点追踪应变成像（X-strain imaging，XS）评价颈动脉斑块运动特点的影响。 方法 选择2015年3月-2016年6月常规超声检查患有颈动脉硬化斑块者49例行斑点追踪应变成像 检查，并根据颈内动脉血流阻力指数分为高阻力指数组和低阻力指数组，比较两组间颈动脉斑块不 同位置应变及运动特点。 结果 两组间颈动脉斑块大小差异无显著性。高阻力指数组较低阻力指数组斑块各个位置的运动 明显，斑块顶部两者比较差异有显著性（P＜0.05），近心端及远心端肩峰处两者比较差异无显著性 （P＞0.05）。 结论 阻力指数可以影响颈动脉斑块运动，阻力指数增高，斑块应变及运动更明显。

关键词: 颈动脉斑块; 应变成像; 超声; 运动