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The hearing range of the human ear is limited. It can only feel the sound of 20-20000 Hz, and the sound above 20000 Hz cannot be heard. This sound is called ultrasound. Like ordinary sound, ultrasound can propagate in a certain direction and can penetrate objects. If it encounters an obstacle, it will generate an echo. Different obstacles will generate different echoes. People collect this echo through instruments. And displayed on the screen, can be used to understand the internal structure of the object. Using this principle, people use ultrasound to diagnose and treat human diseases. There are many types of ultrasonic diagnostic instruments used in clinical medicine, such as A-type, B-type, M-type, fan-shaped and Doppler ultrasound-type, etc. Type B is one of them, and it is the most widely and easily used clinically. Through B-ultrasound, various cross-sectional graphics of various internal organs of the human body can be obtained relatively clearly. B-ultrasound is more suitable for the diagnosis of liver, gallbladder, kidney, bladder, uterus, ovary and other organ diseases. The price of B-ultrasound examination is also relatively cheap, and there is no adverse reaction, and it can be checked repeatedly.
The so-called "B-ultrasound" is to emit ultrasonic waves to the human body, and at the same time receive the reflected waves from internal organs, and reflect the information carried on the screen.
Basic principle: Ultrasound propagates in the human body. Due to the differences in the acoustic characteristics of various tissues of the human body, ultrasonic waves produce reflection, refraction, scattering, diffraction, attenuation, and relative motion between the sound source and receiver at the interface of two different tissues. Physical properties such as Le frequency shift. Apply different types of ultrasonic diagnostic instruments, adopt various scanning methods, receive these reflected and scattered signals, display the shape of various tissues and their lesions, combine pathology and clinical medicine, observe, analyze and summarize different reflection laws, and Diagnose the location, nature and degree of dysfunction of the lesion.
When used for diagnosis, ultrasound is only used as a carrier of information. Ultrasonic waves are injected into the human body to obtain information about physiology and pathology through the interaction between it and human tissues. Generally, low-intensity ultrasound below tens of mW/cm2 is used. The current ultrasonic diagnostic technology is mainly used for the diagnosis of liquid and solid lesions in the body, but it cannot detect the lesions covered by bone and gas, so its clinical application is limited to a certain extent.
When used for treatment, ultrasound is used as a form of energy to produce structural or functional and other biological effects on human tissues in order to achieve certain therapeutic purposes. Generally, high-intensity ultrasonic waves of hundreds to thousands of mW/cm2 are used.
Mianyang United Ultrasound Electronics limited company(https://www.uniultrasonic.com/) has different ultrasonic products such as B/W ultrasound,Color Doppler Ultrasound,Veterinary Ultrasound Scanner. For more quotation information,please contact 19380503853 or add wechat ID:unitedultrasound.
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