Populiarios mokslo žinios apieultragarsu
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.
Ultragarso dažnis, paprastai naudojamas medicininei diagnostikai, yra 210 MHz. Jis gali keliauti per kūną ir atspindėti dalį jo atgal, kai atsitrenkia į skirtingus audinius. Pagal šią fizinę savybę mokslininkai sukūrė įvairius ultragarsinius prietaisus. Ultragarso bangą generuoja ir skleidžia zondas. Dalis ultragarso bangos, patekusios į žmogaus kūną, atsispindi atgal, atsižvelgiant į žmogaus organų ir audinių akustinių savybių skirtumus, o po to priimama zondo ir apdorojama kompiuteriu, rodoma ir atsekama bangų formų, kreivių pavidalu. arba vaizdai. , Ultragarsas – tai diagnostikos metodas, kuriuo echoskopijos gydytojas pagal vaizdo ypatumus gali atskirti fiziologines ir patologines būkles.
