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基于运动物体对入射超声频率所产生的反射频率改变的多普勒效应原理,可测定血管搏动及血管内血流的大体情况,但不能定出血流的方向。为取出血流流速的准确数据及定出流速的方向(矢量),制成配套多普勒流速描记器。
The principle of Doppler effect based on the change of the reflection frequency of the moving object to the incident ultrasound frequency can determine the general situation of the pulse and the blood flow of the blood vessel but can not determine the direction of the blood flow. In order to take the accurate data of the blood flow velocity and determine the direction of the flow velocity (vector), a matching Doppler flow velocity spectrometer is made.