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

多普勒彩色血流图在检测病理性血流动力学方面是优越的，因为它与CRT上的二维超声心动图同时显示。多普勒彩色血流图不能提供血流动力学异常的定量值。在本研究中，将构成颜色信号的每个像素中的红、绿、蓝三原色的数字值采样到微型计算机中，并重新计算，以显示一定流速的剖面、等速流在心脏腔和血管中的宽度，或流过一定区域的血容量。我们已经证实，彩色流图可以用计算机体外流模型电路进行分析。我们可以设定设备增益、信号抑制等的最佳水平。在临床应用中，我们发现左心室的流入从二尖瓣口到左室腔中部呈平坦的轮廓，并逐渐变窄，向心尖方向的宽度更大。相反，二尖瓣狭窄患者的血流向左房腔狭窄的二尖瓣口收缩，并在二尖瓣口至心尖处呈平坦轮廓。在二尖瓣返流患者中，在二尖瓣瓣瓣闭合部位的心室侧观察到血流收缩。反流进入左心房后，很快就变得湍流并扩散。湍流的严重程度是用计算机计算出来的。湍流度越显著，反流射流相对于反流射流的距离越宽。我们可以根据血流的宽度计算出血管的宽度。我们通过颜色编码的流信号及其区域的亮度来测量笔画体积。彩色流映射的强度受患者身高衰减的影响。我们发现外周静脉注射造影剂可以增强左心的多普勒彩色血流图。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