Pengetahuan sains populer tentangUSG
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.
Frekuensi ultrasonik yang biasa digunakan untuk diagnosis medis adalah 210MHz. Itu dapat melakukan perjalanan melalui tubuh dan memantulkannya kembali setelah mengenai jaringan yang berbeda. Menurut sifat fisik ini, para ilmuwan telah mengembangkan berbagai instrumen ultrasonik. Gelombang ultrasonik dihasilkan dan dipancarkan oleh probe. Setelah memasuki tubuh manusia, bagian dari gelombang ultrasonik dipantulkan kembali sesuai dengan perbedaan sifat akustik organ dan jaringan manusia, dan kemudian diterima oleh probe dan diproses oleh komputer, ditampilkan dan dilacak dalam bentuk gelombang, kurva atau gambar. , Ultrasonografi adalah metode diagnostik yang dokter USG dapat membedakan kondisi fisiologis dan patologis sesuai dengan karakteristik gambar.
