Patient's question:
Hello doctor, I am a 27-year-old woman and I am pregnant, so I would like to understand what the basic principle of ultrasound imaging is.Doctor's answer:
The principle of ultrasound imaging is to emit a set of ultrasonic waves towards the human body and scan them in a certain direction. By monitoring the delay time and intensity of the echoes, the distance and nature of the organs can be determined. After processing by electronic circuits and computers, the B images we see today are formed. The general working process of a B is as follows: when the probe receives an excitation pulse, it emits ultrasonic waves (at the same time, the probe is controlled by a focusing delay circuit to achieve acoustic focusing of the sound waves). After a certain delay, the probe then receives the reflected echo signals. The echo signals received by the probe are filtered, logarithmically amplified, and other signal processing before being digitally converted by the DSC circuit to form digital signals. Under the control of the CPU, further image processing is performed.