Preliminary longitudinal mechanical pattern study of the isolated carotid atherosclerotic plaque intima using velocity vector imaging
- VernacularTitle:孤立性颈动脉粥样硬化斑块内膜长轴切面力学状态的初步超声研究
- Author:
Wensheng YUE
;
Lixue YIN
;
Shan WANG
;
Yan DENG
;
Mingliang ZUO
;
Shuang LI
;
Yang YU
;
Anguo LUO
- Publication Type:Journal Article
- Keywords:
Ultrasonography;
Carotid stenosis;
Atherosclerosis;
Velocity vector imaging
- From:
Chinese Journal of Ultrasonography
2008;17(8):681-684
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the mechanical homogeneity pattern of isolated carotid atherosclerotic plaque intima on longitudinal axis view using ultrasonic velocity vector imaging.Methods Fourty six patients with 48 isolated plaques were undergone the high frequency ultrasound scanning,the real-time two-dimensional longitudinal-axis gray scale view at the maximal thickness of the plaque was obtained in three complete cardiac cycles.A dedicated velocity vector imaging(ⅤⅤⅠ)workstation was used for the off-line dynamic two-dimensional gray-scale image analysis and mechanics parameter(i.e.,the peak strain and the absolute difference of the peak strain)assessment at the sites of the upper,middle and down stream separately.The length and direction distribution of the velocity vectors at the carotid atherosclerotic plaque intima were observed.Wilcoxon test was utilized for the comparison of the peak strain and the absolute difference of the peak strain between two sites.Results The chaos phenomenon of velocity vector distribution at the sites of plaque intima occurred significantly differed from those uniform velocity vectors at the reference sites.According to the two groups of the higher strain value side and the lower strain value side on the upper stream and the down stream of the plaque intima,the peak strain at the higher strain value side was significantly higher than the lower strain value side(P=0.000).There was a significantly difference between the absolute difference of peak strain from the higher strain value side to the middle stream point of the plaque intima and the absolute difference of peak strain from the lower strain value side to the higher strain value side of the plaque intima(P＜0.017).Conclusions The length and direction distribution of velocity vectors of the isolated carotid atherosclerotic plaque intima on longitudinal axis view are uneven,the mechanical heterogeneity pattern exists at the plaque intima and could be visualized and quantitatively evaluated using ultrasonic velocity vector imaging.
