We all know that the ultrasonic diagnostic instrument generates incident ultrasonic waves (transmitting waves) and receives reflected ultrasonic waves (echo waves) through the probe. It is an important part of the diagnostic equipment, just like the eyes of the B-ultrasound machine, and it is also connected with the human body and the equipment. medium.
The task of the ultrasound probe is to convert electrical signals into ultrasonic signals or vice versa. The probe can transmit and receive ultrasound, and perform electro-acoustic and signal conversion. It can convert the electrical signal sent by the host into a high-frequency oscillating ultrasonic signal, and can also convert the ultrasonic signal reflected back from the tissues and organs into electrical signals. on the monitor of the host computer. The ultrasonic probe is made using this working principle. In general terms, it converts the electrical signal emitted by the ultrasound into high-frequency sound waves and transmits it through the human body, and then converts the reflected signal into an electrical signal and displays it on the host screen, just like a whale. The ultrasonic frequencies emitted in the ocean are like bats judging the distance of objects by the reflection of sound waves at night.
The wafer inside the probe can produce elastic deformation under the power-on state, thereby generating ultrasonic sound waves; on the contrary, when ultrasonic sound waves pass through the wafer, it can also cause elastic deformation, which in turn causes voltage changes, and finally passes through The signal processing board processes the corresponding electrical signal changes to complete the image detection of the detected object. This processing process is called piezoelectric effect (positive and inverse piezoelectric effect).
The application of common ultrasound probes in various departments：
Application of convex array probe (3.5MHz) in obstetrics and gynecology and hepatobiliary, pancreas, spleen and kidney
Line array probe (3.5MHz) for applications of blood vessels and small organs
Post time: Feb-23-2022