In simple terms, B-ultrasound refers to high-definition black and white B-ultrasound combined with color Doppler. First, let's talk about the frequency shift diagnostic method of ultrasound, also known as D-ultrasound. This method applies the principle of Doppler effect. When there is relative motion between the sound source and the receiver (i.e. the probe and reflector), the frequency of the echo changes, which is called frequency shift. D-ultrasound includes pulse Doppler, continuous Doppler, and color Doppler blood flow images. At present, the development direction of B-ultrasound in the medical field is color ultrasound.
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