二尖瓣反流的超声多普勒模拟显像

Ultrasonic Doppler flow imaging simulation of mitral regurgitation

目的模拟二尖瓣反流的超声Doppler成像。方法据圆形轴对称自由紊动射流模型,利用超声成像模拟软件FieldⅡ模拟简化的二尖瓣反流的三种情况:①完全正向射流;②中心为正向射流,边缘为负向反流;③上半部分为正向射流,下半部分为负向反流。获得不同情况下的RF信号,然后采用脉冲多普勒方法估计血流速度,并对RF信号进行经典谱分析。结果得到了三种情况不同成像角度的RF信号,并估计出血流速度,获得彩色多普勒显像以及RF信号的频谱图。随着超声波束与血流角度的减小,检测到速度增加。结论模拟结果表明不同情况的血流都得到了很好的成像模拟,对于临床二尖瓣反流评价具有一定的指导意义。

Objective To simulate the ultrasound Doppler flow imaging of mitral regurgitation. Methods Based on the model of round axial symmetry turbulent jet, three simplified categories of the mitral regurgitant jet were proposed. RF signals were obtained by employing the ultrasound imaging software Field Ⅱ. With the application of pulsed Doppler method, blood velocity was estimated. The spectrum analysis of RF signals was undertaken using FFT. Results Acquired the RF signals of three different categories with different imaging angle and the estimated blood velocity, in addition the color Doppler flow imaging （CDFI） and the spectrum were also obtained. The estimated velocity increased with the decrease of angle between the ultrasonic beam and blood flow. Condusion The results showed that a good simulation was obtained by using this method and it would be significant for assessing mitral regurgitation clinically.