What is meant by "ultrasound"
The human ear has a limited range of hearing and can only perceive sounds of 16-20,000 hertz, and cannot hear sounds above 20,000 hertz, which are called ultrasound. And ordinary sound, ultrasound can be propagated in a certain direction, and can penetrate the object, if encountered obstacles, will produce an echo, not the same obstacles will produce different echoes, people through the instrument will be this echo collection and display on the screen, can be used to understand the internal structure of the object. Utilizing this principle, people use ultrasound to diagnose and treat human diseases. There are many types of diagnostic ultrasound instruments used in medical clinics, such as type A, type B, type M, fan and Doppler ultrasound, etc. Type B is one of them, and it is the most widely used and easy to use one in clinics. Ultrasound can be used to obtain clearer images of various sections of the internal organs of the human body.Ultrasound is more suitable for the diagnosis of diseases of the liver, gallbladder and kidneys, bladder, uterus, ovaries, etc.Ultrasound is also cheaper and has no adverse effects, and can be repeated.Ultrasound has its own shortcomings. Its resolution is not high enough and some too small lesions cannot be easily detected. Some parts of the organs covered by high gas content are not easy to be shown very clearly. At the same time, the examiner's meticulousness and experience have a great deal to do with the accuracy of the diagnosis.
It can be seen that it works by applying the principle of reflection of ultrasound.
1) Ultrasound and color ultrasound are one of the better tools for the diagnosis of biliary and renal stones;
2) Ultrasound is an economical, practical, reproducible and non-invasive means of examination. Due to the different densities of human tissues, different tissues have different acoustic impedances. When the incident ultrasound into the adjacent two tissues or organs, there will be a difference in acoustic impedance, when this difference > 0.1, through the interface of the two tissues of the ultrasound wave will be reflected and refracted. Thus, when the sound wave passes through the formation of an acoustic interface between the two tissues, different tissues and show different echoes. According to the different echoes ultrasound can detect certain tendons, ligaments, articular cartilage and some bone lesions, is an important aid in the diagnosis of orthopedic disorders,
3) Especially in the obstetrics of the scope of the application of the unprecedented expansion of its assessment of the fetal structure of the anomalies, multiple pregnancies, the size of the fetus as well as the cycle of pregnancy and other conditions of great significance, obstetrics ultrasound to its painless, non-invasive, The obstetric ultrasound is known for its painless, non-invasive and rapid three major advantages.
4) Clinically, it is widely used in cardiology, gastroenterology, urology and obstetrics and gynecology diagnosis.