Nolsøe C P, Lorentzen T
Ultralydafdelingen, Københavns Amts Sygehus i Herlev.
Ugeskr Laeger. 1991 Dec 9;153(50):3549-53.
The medical ultrasound, the Doppler frequency shift is the difference between the frequency of the transmitted and reflected ultrasound. This is due a relative movement between the reflector (most frequently the red blood cells) and the ultrasound transducer. The ultrasound apparatus registers this difference in frequency and calculates the linear rate of flow employing the Doppler equation. The Doppler analysis is presented acoustically, graphically or by means of a colour code. In pulsed Doppler technique, conventional ultrasound scanning can be combined with Doppler analysis. Important indications are: differentiation between vascular and non-vascular structure, documentation of flow and determination of the direction of flow, diagnosis and quantitation of arterial stenoses and assessment of transplants.
在医学超声中，多普勒频移是发射超声与反射超声频率之间的差异。这是由于反射体（最常见的是红细胞）与超声换能器之间的相对运动所致。超声设备记录这种频率差异，并使用多普勒方程计算线性流速。多普勒分析以声音、图形或颜色编码的方式呈现。在脉冲多普勒技术中，传统超声扫描可与多普勒分析相结合。重要的适应证包括：区分血管结构与非血管结构、记录血流及确定血流方向、诊断和定量动脉狭窄以及评估移植情况。
