There is no difference between color ultrasound and B ultrasound, they are all similar. Color Doppler mainly looks at blood vessels, such as the heart, and the color is added by the computer according to the direction of blood flow.
At present, the development direction of B-ultrasound in the medical field is color ultrasound.
Characteristics of color Doppler ultrasound;
Color Doppler ultrasound is simply high-definition black-and-white B-ultrasound plus color Doppler. Let's talk about ultrasonic frequency shift diagnosis, that is, D-mode ultrasound. This method applies the principle of Doppler effect. When there is relative motion between the sound source and the receiver (that is, the probe and the reflector), the frequency of the echo changes, which is called frequency shift. Two-dimensional ultrasound includes pulsed Doppler, continuous Doppler and color Doppler blood flow images.
Color Doppler ultrasound generally uses autocorrelation technology to process Doppler signals, and the blood flow signals obtained by autocorrelation technology are superimposed on two-dimensional images in real time after color coding, that is, color Doppler ultrasound blood flow images are formed. It can be seen that color Doppler ultrasound not only has the advantages of two-dimensional ultrasonic structural images, but also provides rich hemodynamic information. Its practical application has been widely valued and welcomed, and it is known as "noninvasive angiography" in clinic. Its main advantages are: ① It can quickly and intuitively display the two-dimensional plane distribution of blood flow. ② It can display the running direction of blood flow. ③ It is helpful to distinguish arteries from veins. ④ It is helpful to distinguish vascular diseases from non-vascular diseases. ⑤ It helps to understand the essence of blood flow. ⑥ It is convenient to know the phase and velocity of blood flow. ⑦ Shunt and reflux can be found reliably. ⑧ The source, width, length and area of blood flow beam can be quantitatively analyzed.
But the related technology used in color Doppler ultrasound is pulse wave. When the speed of the detected object is too high, the color of color blood flow will be wrong, which is obviously not as good as spectral Doppler in quantitative analysis. Nowadays, all color Doppler ultrasound instruments have the function of spectrum Doppler, that is, color-dual-function ultrasound.
Color Doppler flow imaging (CDF) is also called color Doppler ultrasound imaging (CDI). The source of echo information obtained by CDF is consistent with spectrum Doppler, showing the distribution and direction of blood flow in two dimensions, and distinguishing different speeds with different colors. Dual-function Doppler ultrasound system, that is, B-mode ultrasound image shows the location of blood vessels. Doppler measurement of blood flow. This combination of B-mode and Doppler system can locate any specific blood vessel more accurately.