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Ultrasound can be generated at very high frequencies; ultrasound is used for sonochemistry at frequencies up to multiple hundreds of kilohertz. [6] [7] Medical imaging equipment uses frequencies in the MHz range. [8] UHF ultrasound waves have been generated as high as the gigahertz range. [9] [10] [11]
The machine used is called an ultrasound machine, a sonograph or an echograph. The visual image formed using this technique is called an ultrasonogram, a sonogram or an echogram. Ultrasound of carotid artery. Ultrasound is composed of sound waves with frequencies greater than 20,000 Hz, which is the approximate upper threshold of human hearing. [1]
HIFU uses an ultrasound device that is able to precisely focus ultrasound waves at a target tissue or specific group of cells. At the focus of this ultrasound energy, the temperature can reach excesses of 80 °C which results in nearly spontaneous coagulative necrosis or cell death without harming neighboring cells.
Ultrasound-assisted lipectomy involves the use of ultrasound to aid in removal of subcutaneous fat during liposuction procedures. [19] Highly focused ultrasound waves are used to emulsify fat cells and allow for easier removal with suction. [19]
Ultrasonic cleaning is a process that uses ultrasound (usually from 20 to 40 kHz) to agitate a fluid, with a cleaning effect. Ultrasonic cleaners come in a variety of sizes, from small desktop units with an internal volume of less than 0.5 litres (0.13 US gal), to large industrial units with volumes approaching 1,000 litres (260 US gal).
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.
High-intensity focused ultrasound (HIFU), or MR-guided focused ultrasound surgery (MR-guided focused ultrasound ablation), is an incisionless therapeutic technique [1] that uses non-ionizing ultrasonic waves to heat or ablate tissue.
Ultrasound computer tomography (USCT), sometimes also Ultrasound computed tomography, Ultrasound computerized tomography [1] or just Ultrasound tomography, [2] is a form of medical ultrasound tomography utilizing ultrasound waves as physical phenomenon for imaging. It is mostly in use for soft tissue medical imaging, especially breast imaging ...
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