What is color Doppler ultrasound?

It is used for ultrasonic imaging, measurement and blood flow movement information collection for clinical ultrasonic diagnostic examination. The probe can pass through the esophagus, in the blood vessel, through the internal tissue of the human body during operation, and/or be used in fields such as ultrasound navigation.

Features
1. Color Doppler Ultrasound generally uses autocorrelation technology for Doppler signal processing. The blood flow signal obtained by autocorrelation technology is color-coded and superimposed on the two-dimensional image in real time to form a color Doppler ultrasound blood flow signal. stream images. It can be seen that color Doppler ultrasound (color Doppler ultrasound) not only has the advantages of two-dimensional ultrasound structure images, but also provides rich information of hemodynamics. The practical application has been widely valued and welcomed. For "non-invasive angiography". Its main advantages are:
①It can quickly and intuitively display the two-dimensional plane distribution state of blood flow.
② It can display the running direction of blood flow.
③ It is beneficial to distinguish between arteries and veins.
④ It is beneficial to identify vascular lesions and non-vascular lesions.
⑤ It is beneficial to understand the nature of blood flow.
⑥ It is convenient to understand the phase and speed of blood flow.
⑦ can reliably detect shunt and reflux.
⑧ Be able to quantitatively analyze the origin, width, length and area of the blood stream.
2. The related technology used in color ultrasound is pulse wave. When the speed of the detected object is too high, the color flow color will be wrong, which is obviously inferior to spectral Doppler in quantitative analysis. Nowadays, color Doppler ultrasound instruments all have spectral Doppler. Le's function is color ─ duplex ultrasound.
3. Color Doppler Ultrasound Flow Diagram (CDF), also known as Color Doppler Ultrasound Imaging (CDI), the source of echo information obtained by it is consistent with that of spectral Doppler, and the distribution and direction of blood flow are displayed in two dimensions. Different speeds are distinguished by different colors. Duplex Doppler ultrasound system, that is, the B-mode ultrasound image shows the position of blood vessels. Doppler measures blood flow, and the combination of this B-mode and Doppler system allows for more precise localization of any particular blood vessel.
1. Blood Flow Direction In the spectral Doppler display, the zero baseline is used to differentiate the direction of blood flow. Those above the zero baseline indicate blood flow to the probe, and those below the zero baseline indicate blood flow away from the probe. In CDI, the direction of blood flow is color-coded, with a red or yellow color spectrum indicating blood flow toward the probe (hot colors); and a blue or turquoise color spectrum indicating blood flow away from the probe (cool colors).
2. Vascular distribution CDI shows the blood flow in the lumen of the blood vessel, so it belongs to the flow channel display, and it cannot show the blood vessel wall and adventitia.
3. Differentiate the blood vessel types of cancer nodules CDI can be used to classify the blood vessels of liver cancer nodules. It can be distinguished as surrounding blood vessels around the nodules and arc-shaped blood vessels on the inner edge of the nodules. Nodule inflow vessels, nodule internal vessels and nodule outflow vessels, etc.

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