Burns P N
Department of Diagnostic Radiology, Yale University School of Medicine, New Haven, Connecticut 06510.
J Clin Ultrasound. 1987 Nov-Dec;15(9):567-90. doi: 10.1002/jcu.1870150903.
The Doppler effect provides an ultrasonic method for the detection of echoes from moving structures, particularly flowing blood. In its most simple form, the continuous wave Doppler offers velocity information without depth resolution and is therefore used mainly for the examination of superficial structures. The pulsed Doppler, in combination with real-time imaging, provides a more flexible tool for the interrogation of selected sites in an ultrasound image for motion and flow. The recent development of Doppler flow imaging, in which limited Doppler information is displayed over an entire ultrasound image, usually in color and in real-time, promises to secure the association between Doppler and conventional ultrasound imaging techniques. Spectral analysis permits features of the Doppler signal to be identified which are associated with hemodynamic phenomena, such as flow disturbance and wave reflection. In addition, it allows the quantitative application of Doppler to the estimation of such physiological variables as velocity, flow rate, and pressure difference.
多普勒效应提供了一种超声方法，用于检测来自移动结构（特别是流动血液）的回声。以其最简单的形式，连续波多普勒可提供速度信息，但没有深度分辨率，因此主要用于浅表结构的检查。脉冲多普勒与实时成像相结合，为在超声图像中选定部位的运动和血流询问提供了更灵活的工具。多普勒血流成像的最新发展，即将有限的多普勒信息通常以彩色实时显示在整个超声图像上，有望巩固多普勒与传统超声成像技术之间的联系。频谱分析能够识别与血流动力学现象（如血流紊乱和波反射）相关的多普勒信号特征。此外，它还允许将多普勒定量应用于诸如速度、流速和压差等生理变量的估计。
