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Doppler ultrasound
The doppler effect of sound waves can also be used in medical diagnosis, known as color doppler ultrasound.Colour to exceed simple said is high-definition black-and-white ultrasound and color doppler, first, super audio diagnostics, namely D super, this law basis of the principle of doppler effect, when the sound source and the receiving body (i.e., sensor and reflector) between the relative shipment, the echo of the frequency change, the change of the frequency is called frequency shift, D super including pulse doppler, continuous doppler and color doppler flow image.In general, color doppler ultrasound USES autocorrelation technology for doppler signal processing, and the blood flow signal obtained by autocorrelation technology is superimposed on the two-dimensional image in real time after color coding, that is, the color doppler flow image is formed.Thus it can be seen that color doppler ultrasound (i.e., color doppler ultrasound) not only has the advantages of two-dimensional ultrasound structure images, but also provides abundant hemodynamic information. Its practical application has been widely valued and welcomed, and it is praised as "non-traumatic angiography" in clinical practice.


Angiography is an auxiliary examination method to check whether the blood vessels are normal.Angiography is called noninvasive angiography.Color doppler ultrasound was used to show the anatomical structure of vessels and the inner diameter of vessels.The color super is formed by adding false color based on the theory of doppler effect on the basis of the black and white B super image.The site of the lesion and its corresponding symptoms can be judged by this examination.

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