| ultrasonic waves | The periodic configuration of energy produced by sound having a frequency greater than 30,000 Hz. (05 Mar 2000) |
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| ultrasonics | That part of the science of acoustics dealing with the frequency range beyond the upper limit of perception by the human ear (beyond 20,000 hertz per second), but usually restricted to frequencies above 500,000 hertz per second. Ultrasonic radiation is injurious to tissues because of its thermal effects when absorbed by living matter, but in controlled doses it is used therapeutically to selectively break down tissues, as in treatment of arthritis and lesions of the nervous system, and also as a diagnostic aid by visually displaying echoes received from irradiated tissues, as in echocardiography and echoencephalography. (12 Dec 1998) |
| ultrasonogram | The image obtained by ultrasonography. See: echogram. Synonym: sonogram. (05 Mar 2000) |
| ultrasonograph | Computerised instrument used to create an image using ultrasound. Synonym: sonograph. Origin: ultra-+ L. Sonus, sound, + G. Grapho, to write (05 Mar 2000) |
| ultrasonographer | A person who performs and interprets ultrasonographic examinations. Synonym: echographer, sonographer. (05 Mar 2000) |
| ultrasonography | <investigation, procedure> A technique in which high-frequency sound waves are bounced off internal organs and the echo pattern is converted into a 2 dimensional picture of the structures beneath the transducer. (12 May 1997) |
| ultrasonography, doppler | Ultrasonography applying the doppler effect, with frequency-shifted ultrasound reflections produced by moving targets (usually red blood cells) in the bloodstream along the ultrasound axis in direct proportion to the velocity of movement of the targets, to determine both direction and velocity of blood flow. (12 Dec 1998) |
| ultrasonography, doppler, colour | Ultrasonography applying the doppler effect, with the superposition of flow information as colours on a gray scale in a real-time image. This type of ultrasonography is well-suited to identifying the location of high-velocity flow (such as in a stenosis) or of mapping the extent of flow in a certain region. (12 Dec 1998) |
| ultrasonography, doppler, duplex | Ultrasonography applying the doppler effect combined with real-time imaging. The real-time image is created by rapid movement of the ultrasound beam. A powerful advantage of this technique is the ability to estimate the velocity of flow from the doppler shift frequency. (12 Dec 1998) |
| ultrasonography, doppler, pulsed | Ultrasonography applying the doppler effect, with velocity detection combined with range discrimination. Short bursts of ultrasound are transmitted at regular intervals and the echoes are demodulated as they return. (12 Dec 1998) |
| ultrasonography, doppler, transcranial | A non-invasive technique using ultrasound for the measurement of cerebrovascular haemodynamics, particularly cerebral blood flow velocity and cerebral collateral flow. With a high-intensity, low-frequency pulse probe, the intracranial arteries may be studied transtemporally, transorbitally, or from below the foramen magnum. (12 Dec 1998) |
| ultrasonography, interventional | Ultrasonography using invasive or surgical procedures. Its widest application is intravascular ultrasound imaging but it is useful also in urology and intra-abdominal conditions. (12 Dec 1998) |
| ultrasonography, mammary | Use of ultrasound for imaging the breast. The most frequent application is the diagnosis of neoplasms of the female breast. (12 Dec 1998) |
| ultrasonography, prenatal | The visualization of tissues during pregnancy through recording of the echoes of ultrasonic waves directed into the body. The procedure may be applied with reference to the mother or the foetus and with reference to organs or the detection of maternal or foetal disease. (12 Dec 1998) |
| ultrasonosurgery | Use of ultrasound techniques to disrupt cells, tissues, or tracts, particularly in the central nervous system. (05 Mar 2000) |
| ultrasound |
A procedure in which high-energy sound waves (ultrasound) are bounced off internal tissues or organs and make echoes. The echo patterns are shown on the screen of an ultrasound machine, forming a picture of body tissues called a sonogram. Also called ultrasonography.
출처: www.stjude.org/glossary
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| ultraviolet radiation |
UV radiation. Invisible rays that are part of the energy that comes from the sun. UV radiation also comes from sun lamps and tanning beds. UV radiation can damage the skin and cause melanoma and other types of skin cancer. UV radiation that reaches the Earth's surface is made up of two types of rays, called UVA and UVB rays. UVB rays are more likely than UVA rays to cause sunburn, but UVA rays pass deeper into the skin. ...
출처: www.stjude.org/glossary
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| ultrasonic |
Referring to sound waves with frequencies higher than those at the upper limit of unimpaired human hearing, usually between 16 and 20 KHz.
출처: amsglossary.allenpress.com/glossary/browse
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| ultraviolet |
(Abbreviated UV.) Pertaining to or same as ultraviolet radiation.
출처: amsglossary.allenpress.com/glossary/browse
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| ultraviolet radiation |
(UV) The portion of the electromagnetic spectrum with wavelengths from about 100 to 400 nm; between ionizing radiation (X-rays) and visible light. UV is absorbed by DNA and is highly mutagenic to unicellular organisms and to the epidermal cells of multicellular organisms. UV light is used in tissue culture for its mutagenic and bactericidal properties.
출처: www.fao.org/docrep/003/X3910E/X3910E24.htm
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| UL | alternative name for the class Chlorophyceae in some classifications |
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| UL | Roman misspelling for Odysseus |
| UL | 18th President of the United States |
| UL | 18th President of the United States |
| UL | 18th President of the United States |