Enhancement of Capability of Doppler Color Flow Mapping by the Computer and its Clinical Applications.

彩色多普勒血流图能与CRT二维超声心动图同时显示，因此在检测病理血流动力学方面更具优势。彩色多普勒血流图不能提供血流动力学异常的量化值。本研究将构成彩色信号的每个像素的红、绿、蓝三原色的数字值采样到微型计算机中重新计算，以显示某一血流速度的轮廓、心腔和血管中等速流的宽度或流经某一区域的血流量。我们已经证实，彩色血流图谱可以通过计算机体外血流模型电路进行分析。在临床应用中，我们发现从二尖瓣口到左室腔中部的左室流出道是平坦的，变成了狭窄的…更多的宽度朝向顶点。反之，二尖瓣狭窄患者的二尖瓣血流向左心房狭窄的二尖瓣口收缩，并在整个二尖瓣口至心尖部呈平坦的轮廓。在二尖瓣返流患者中，二尖瓣小叶粘连部位的室侧可见血流收缩。返流性血流进入左心房后很快变得湍急并扩散。湍流的严重程度由计算机计算。与回流射流的距离相比，其湍流度越大，回流射流的宽度越大。我们可以根据血流的宽度计算出血管的宽度。我们根据颜色编码的血流信号的亮度及其面积来测量每搏输出量。彩色流图的强度受患者身高衰减的影响。我们认为从外周静脉注射造影剂可以增强心脏左侧的彩色血流图。较少

Doppler color flow mapping is superior for detecting pathological hemodynamics because of the simultaneous demonstration with two-dimensional echocardiograms on the CRT. The Doppler color flow mapping does not offer the quantitative value of the hemodynamic abnornalities. In the present study, the digital value of the three primary color, that is, red, green and blue, in each pixels composing color signal were sampled into the mini-computer and recalculated to demonstrate the profile of certain flow velocity, width of the isovelocity flow in the cardiac cavity and vessels, or the blood volume flowing the certain area. We have confirmed that the color flow mapping can be analyzed by the computer in vitro model circuit of flow. We could set the optimum level of the equipment gain, rejection of signal etc. In the clinical applications, we indicated that the inflow of the left ventricle was flat profile from the mitral orifice to the middle of the left ventricular cavity and became narrow … More of its width toward the apex. The inflow in the patient of mitral stenosis, on the contrary, shrinks towards the stenotic mitral orifice in the left atrial cavity and shows flat profile throughout the mitral orifice to the apex. In the patient of mitral regurgitation, shrinkage of the blood flow was observed in the ventricular side of the coaptation site of the mitral leaflets. The regurgitant flow became turbulent and spread soon after flowing into the left atrium. The severity of turbulence was calculated by computer. The more significant its turbulence, the wider the regurgitant jet in comparison with the distance of regurgitant jet. We could calculated the width of the vessel from the width of the blood flow. We measured the stroke volume from the brightness of the color-coded flow signals and their areas. The intensity of the color flow mapping is influenced by the attenuation by the patient's stature. We indicated that the contrast solution injected from the peripheral vein could be enhanced the Doppler color flow mapping of the left side of the heart. Less