脉冲多普勒超声定量检测狭窄管流中流动指标的方法学探讨

Quantitative Detection of Flow Indices in Tubal Flow Via Pulsed Doppler Ultrasound, in vitro

目的 探讨狭窄管流中一系列流动指标的定量检测方法 ,包括 Reynolds数、相对频带展宽度(RSB)、层流剪应力、法向雷诺应力 (RNS)等。方法 采用临床使用的脉冲多普勒血流仪在狭窄前后多个位点进行多时点检测 ,得出流场特征 ,再分别评价各项指标。结果 定性评价见狭窄下游呈现鲜亮的“烛焰形”花色镶嵌湍流流型 ,狭窄后 1.0 cm处得到较大的 RSB、RNS等 ,1/ 2 R取样容积处湍流指标大于相应的轴心处。结论 狭窄后1.0 cm1/ 2 R取样容积处存在最大的湍流度 ;狭窄后各位点的数据离散度大于狭窄前。

Objective This paper deals with the method and feasibility of quantitative detection of flow indices via commercially available Pulsed Doppler Ultrasound. Methods The indices, such as Reynolds number, relative spectral broadening (RSB), laminar shear stress and Reynolds normal stress (RNS) were selected and evaluated. Detection was done temporally and spatially, upstream and downstream of the stenosis. The data were evaluated qualitatively and quantitatively. Results The roughest turbulence was met at 1/2 R sample volume, 1 0 cm downstream of the stenosis. Conclusion The methodology in this study is proved to be feasible and may have good prospects in clinical use.