Doppler echocardiography

Doppler echocardiography: There are many red blood cells in the blood, which can reflect and scatter the ultrasound and can be considered as a tiny sound source. When the probe is placed in the intercostal space, it emits ultrasonic waves. As the red blood cells flow in the heart or large blood vessels, the sound frequency scattered by the red blood cells changes. As the red blood cells move toward the probe, the reflected sound frequency increases and vice versa. The difference between the sound frequency of this red blood cell and the probe when it is in relative motion is called the Doppler frequency shift. It can show the speed, direction and nature of blood flow. Doppler echocardiography is further divided into pulse Doppler echocardiography, continuous wave Doppler echocardiography, and color Doppler echocardiography. The most commonly used is pulse Doppler echocardiography, which can trace the real-time Doppler spectrum of the blood flow at any point in the heart under the condition of two-dimensional image monitoring and positioning.