The medical ultrasound probe is an important part of the medical ultrasound instrument. Its main principle is to use the propagation and reflection characteristics of ultrasonic waves in human tissues to obtain images through the transmitting and receiving functions of the probe to achieve medical diagnosis and treatment.
The principles of medical ultrasound probes can be divided into the following aspects:
1. Piezoelectric effect: Medical ultrasound probes usually use piezoelectric materials, such as quartz crystals, ceramics, etc. When stimulated by an electric field, these materials undergo a piezoelectric effect, that is, mechanical deformation. Using this effect, the piezoelectric material can be vibrated through electric field excitation, thereby generating ultrasonic waves.
2. Pulse wave emission: Medical ultrasound probe emits ultrasonic waves through pulse waves. When a material is excited by an electric field, it vibrates mechanically, producing ultrasonic pulses. The shape of the pulse and frequency of vibration depend on the probe design and drive voltage.
3. Pulse wave reception: In addition to transmitting ultrasonic waves, medical ultrasound probes are also used to receive reflected ultrasonic signals. When ultrasound waves pass through tissue, they are reflected and scattered back to the receiving element of the probe. The receiving element converts the mechanical vibration into a charge signal, which is then converted into an image through a signal processing circuit.
4. Sound beam characteristics: The geometry and arrangement of the transmitting and receiving elements of the medical ultrasound probe will directly affect the sound beam characteristics. Sound beam refers to the energy density distribution of ultrasonic waves propagating in the medium. Medical ultrasound probes often use focusing technology to improve the focusing ability of the sound beam, resulting in clearer images.
5. Doppler effect: Medical ultrasound probes can also use the Doppler effect to measure the speed and direction of fluids. When ultrasonic waves encounter fluid motion, a frequency shift occurs, which is proportional to the fluid speed. By measuring the magnitude and direction of frequency shifts, information about fluid motion can be obtained.
Our contact number: +86 13027992113
Our email: 3512673782@qq.com
Our website: https://www.genosound.com/
Post time: Jan-18-2024
