经颅多普勒超声检查结果怎样看 吴玮 吉林省脑科医院

经颅多普勒超声检查结果怎样看 吴玮 吉林省脑科医院
首先是血流速度，血流速度反映的是脑动脉管腔大小及血流量；其次是看脉冲指数，反应的是脑血管外周阻力的大小，PI值越大脑血管外周阻力越大，反之则阻力越小，音频信号及频谱、图形、波形反应的是脑血管局部的血流状态，它是以发生声波的装置为能源的一种多普勒检查方法，血液中主要是大量的红细胞，红细胞直径与超声波相比很小，超声波遇到红细胞后将发生散射，因此红细胞被看作散射体，反射回来的散射波是多普勒频仪信号的主要组成部分，经颅多普勒超声正向平移提示的是血流朝向探头，负向平移提示的是血流方向背离探头，根据此项参数经颅多普勒可判定颅外大动脉严重狭窄或是闭塞，及侧支循环建立的情况，以此来判断脑卒中预后的情况。

What is the result of TCD
First, the velocity of blood flow, Blood flow velocity reflects the size of cerebral artery lumen and blood flow; Second, look at the pulse index, It reflects the peripheral resistance of cerebral vessels, The pI value is higher and the peripheral resistance of cerebral vessels is higher, On the contrary, the smaller the resistance is, The audio signal, spectrum, figure and waveform reflect the local blood flow state of cerebral vessels, It's a Doppler method that uses the device that generates the sound wave as the energy, There are a lot of red blood cells in the blood, The diameter of red blood cells is smaller than that of ultrasound, When ultrasound meets red blood cells, it will scatter, So red blood cells are seen as scatterers, The reflected scattered wave is the main part of the Doppler frequency instrument signal, Transcranial Doppler ultrasound indicates that the blood flow is toward the probe, The negative translation indicates that the blood flow direction deviates from the probe, According to this parameter, transcranial Doppler can be used to determine the severe stenosis or occlusion of the extracranial artery, And the establishment of collateral circulation, So as to judge the prognosis of stroke.