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Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or less. Ultrasound can be generated at very high frequencies; ultrasound is used for sonochemistry at frequencies up to multiple hundreds of kilohertz.
Medical ultrasound includes diagnostic techniques (mainly imaging techniques) using ultrasound, as well as therapeutic applications of ultrasound. In diagnosis, it is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs, to measure some characteristics (e.g., distances and velocities) or to generate an informative audible sound.
Ultrasound image showing the liver, gallbladder and common bile duct. Medical ultrasound uses high frequency broadband sound waves in the megahertz range that are reflected by tissue to varying degrees to produce (up to 3D) images. This is commonly associated with imaging the fetus in pregnant women. Uses of ultrasound are much broader, however.
pertaining to; one afflicted with Greek -ακός (-akós) cardiac, celiac: acanth-thorn or spine: Greek ἄκανθα (ákantha), thorn acanthion, acanthocyte, acanthoma, acanthulus: acou-[1] of or relating to hearing: Greek ἀκούειν (akoúein), ἀκουστικός (akoustikós), of or for hearing acoumeter, acoustician, hyperacusis: acr-
Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology may be called an acoustical engineer .
Ultrasound is sound with frequencies greater than 20 kHz. Ultrasound may also refer to: Medical ultrasound, ultrasound-based diagnostic techniques; Ultrasound, a 2021 American science fiction film; Ultrasound (band), an English rock band; Gravis UltraSound, a PC sound card "Ultrasound", a song by Eraserheads from the 2001 album Carbon Stereoxide
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Echocardiography, also known as cardiac ultrasound, is the use of ultrasound to examine the heart. It is a type of medical imaging , using standard ultrasound or Doppler ultrasound . [ 1 ] The visual image formed using this technique is called an echocardiogram , a cardiac echo , or simply an echo .