Doppler is simply ultrasound, because this is the most widespread application of the Doppler effect. It is referred to as D ultrasonic diagnostic instrument. This type of diagnostic instrument uses the principle of Doppler effect to detect moving organs and blood flow. According to the working state of ultrasonic source in time domain, Doppler system can be divided into continuous wave Doppler and pulsed wave Doppler.

It is combined with B - type to form a dual - power ultrasonic diagnostic system. Using the same probe, it can not only display the anatomical structure of the organ with B type, but also measure the blood flow information at a certain depth with pulse Doppler. The earliest is to use the same mechanical probe, in B type display, the transducer for sector scanning; For Doppler detection, the transducer stops in a specified direction of the fan and detects the blood flow information at the depth position of the specified sampling volume of the fan. But the pulse Doppler detection can not be carried out at the same time B-type scan, only by the frozen B-type image to indicate the location of the sampling volume. With the application of phased array probe, the simultaneous real-time display of pulse Doppler and type B was realized. This technique can also be used in linear and convex array probes.

Medical Applications:

Transcranial Doppler ultrasonography (TCD)

Carotid ultrasound Doppler

Color Doppler examination of thyroid diseases

Predicting the safety of hepatocellular carcinoma resection

Breast check

Eyeball and orbit

The scrotum and testis, the prostate

Gynecology, fetal heart rate during pregnancy

maxillofacial

Salivary gland

The heart

The rectum