Haqida ommabop ilmiy bilimlarultratovush
Whether it's a health check-up or a visit to the hospital, doctors always ask patients to have an ultrasound. Most people's understanding of ultrasound is that pregnant women need B-ultrasound, but in fact, ultrasound is not only used for pregnant women to check the fetus, this is only a small part of the application of ultrasound in clinical medicine. But what exactly is ultrasound? How does it examine the human body?
Ultrasound, that is, ultrasound, is a mechanical wave. The frequency of sound waves that can be heard by the human ear is between 20 and 20 000 Hz. When the vibration frequency of sound waves is greater than 20 000 Hz or less than 20 Hz, we cannot hear them. Therefore, we call sound waves with frequencies higher than 20 000 Hz "ultrasonic". Ultrasonic has the characteristics of good directionality, strong penetrating ability, easy to obtain relatively concentrated sound energy, long distance in water, etc. It can be used for distance measurement, speed measurement, cleaning, welding, gravel, etc., in medicine, military, industry, agriculture widely used.
Odatda tibbiy diagnostika uchun ishlatiladigan ultratovush chastotasi 210 MGts ni tashkil qiladi. U tana bo'ylab sayohat qilishi va turli to'qimalarga urilgandan keyin uning bir qismini orqaga qaytarishi mumkin. Ushbu jismoniy xususiyatga ko'ra, olimlar turli xil ultratovush asboblarini ishlab chiqdilar. Ultrasonik to'lqin prob tomonidan ishlab chiqariladi va chiqariladi. Inson tanasiga kirgandan so'ng, ultratovush to'lqinining bir qismi inson a'zolari va to'qimalarining akustik xususiyatlarining farqiga qarab orqaga qaytariladi, so'ngra prob tomonidan qabul qilinadi va kompyuter tomonidan qayta ishlanadi, to'lqin shakllari, egri chiziqlar shaklida ko'rsatiladi va kuzatiladi. yoki tasvirlar. , Ultrasonografiya - ultratovush shifokori tasvirning xususiyatlariga ko'ra fiziologik va patologik sharoitlarni ajrata oladigan diagnostika usuli.
