Stewart W J, Cohen G I, Salcedo E E
Department of Cardiology, The Cleveland Clinic Foundation, Cleveland, OH 44195.
Echocardiography. 1991 May;8(3):319-27. doi: 10.1111/j.1540-8175.1991.tb01195.x.
Doppler color flow imaging provides important qualitative information about the location and spatial distribution of intracardiac blood flow. However, the effect of instrument-related variables on the size of color Doppler images requires further definition. Flow of a silicone particle solution was established in a tube or cylinder and scanned as color gain, pulse repetition frequency, depth, and transducer frequency were varied. The diameter of Doppler color flow images were measured during constant laminar or disturbed flow parallel to the ultrasound beam and during laminar flow perpendicular to the ultrasound beam. The diameter of color Doppler images of laminar flow perpendicular and parallel to the beam varied directly with color gain. Diameter varied inversely with transducer frequency for laminar flow parallel to the transducer and inversely with pulse repetition frequency for laminar flow perpendicular to the transducer. The diameter of laminar flow parallel to the transducer varied directly with the depth of the flow area below the transducer. The size of the color flow dropout of laminar flow exactly perpendicular to the ultrasound beam varied directly with transducer frequency and inversely with gain. During disturbed flow parallel to the transducer, the diameter of the image varied directly with gain and inversely with transducer frequency and pulse repetition frequency. Instrument settings have a significant impact on the size of color Doppler images. Understanding the effects of changes in these variables is important for reliable diagnostic use of Doppler color flow imaging.
多普勒彩色血流成像提供了有关心腔内血流位置和空间分布的重要定性信息。然而，仪器相关变量对彩色多普勒图像大小的影响尚需进一步明确。在管道或圆柱体中建立硅酮颗粒溶液的流动，并在改变彩色增益、脉冲重复频率、深度和换能器频率时进行扫描。在与超声束平行的恒定层流或紊乱流期间以及与超声束垂直的层流期间，测量多普勒彩色血流图像的直径。与束垂直和平行的层流彩色多普勒图像的直径随彩色增益直接变化。对于与换能器平行的层流，直径与换能器频率成反比，对于与换能器垂直的层流，直径与脉冲重复频率成反比。与换能器平行的层流直径随换能器下方流动区域的深度直接变化。与超声束完全垂直的层流彩色血流信号失落的大小随换能器频率直接变化，随增益反比变化。在与换能器平行的紊乱流期间，图像直径随增益直接变化，随换能器频率和脉冲重复频率反比变化。仪器设置对彩色多普勒图像的大小有显著影响。了解这些变量变化的影响对于多普勒彩色血流成像的可靠诊断应用很重要。
