| ultrasonic scaler | An ultrasonic instrument that uses high frequency vibration to remove adherent deposits from the teeth. (05 Mar 2000) |
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| ultrasonic therapy | The use of focused, high-frequency sound waves to produce local hyperthermia in certain diseased or injured parts of the body or to destroy the diseased tissue. (12 Dec 1998) |
| ultrasonic waves | The periodic configuration of energy produced by sound having a frequency greater than 30,000 Hz. (05 Mar 2000) |
| 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) |
Synonyms : Interventional Ultrasonography, Intravascular Ultrasonography, Interventional Ultrasound
Synonyms : Breast Ultrasonography, Mammary Ultrasonography, Mammography, Ultrasound, Ultrasonic Mammography, Ultrasonography, Breast, Ultrasound Mammography, Breast Ultrasonographies, Mammary Ultrasonographies, Mammographies, Ultrasonic, Mammographies, Ultrasound
Synonyms : Diagnosis, Prenatal Ultrasonic, Diagnosis, Ultrasonic Prenatal, Prenatal Ultrasonic Diagnosis, Prenatal Ultrasonography, Ultrasonic Diagnosis, Prenatal, Ultrasonic Prenatal Diagnosis, Diagnoses, Prenatal Ultrasonic, Diagnoses, Ultrasonic Prenatal
Synonyms : Transrectal High Intensity Focused Ultrasound
Synonyms : Actinic Ray, Ray, Actinic, Ray, Ultraviolet, Rays, Actinic, Rays, Ultraviolet, Ultraviolet Ray
| ultraviolet radiation |
ultraviolet: radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays
출처: wordnet.princeton.edu/perl/webwn
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| ultracentrifuge |
The ultracentrifuge is a centrifuge optimized for spinning a rotor at very high speeds, capable of generating acceleration as high as 1,000,000 G (9,800 km/s²) There are two kinds of ultracentrifuges, the preparative and the analytical ultracentrifuge. The second, however, is more theoretically important and we will focus on the discussion of the analytical ultracentrifuge. ...
출처: en.wikipedia.org/wiki/Ultracentrifuge
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| ultrafilter |
In mathematics, especially in order theory, an ultrafilter is a subset of a partially ordered set (a poset) which is maximal among all proper filters. Formally, this states that any filter that properly contains an ultrafilter has to be equal to the whole poset. An important special case of the concept occurs if the considered poset is a Boolean algebra, like in the case of an ultrafilter on a set (defined as a filter of the corresponding powerset). ...
출처: en.wikipedia.org/wiki/Ultrafilter
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| ultra- |
Ultra (sometimes capitalised ULTRA) was the name used by the British for intelligence resulting from decryption of German communications in World War II. The term eventually became the standard designation in both Britain and the United States for all intelligence from high-level cryptanalytic sources. ...
출처: en.wikipedia.org/wiki/Ultra
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| ultra- |
Ultra is Depeche Mode's ninth full-length album, which was released on April 15 1997. The album is the first album after the departure of Alan Wilder, who left to focus on his solo project Recoil. The long time that separates this album from the previous was due to David Gahan's near suicide and recovery from addiction to drugs. These two events caused many to speculate the end of Depeche Mode but this didn't turn out to be the case. ...
출처: en.wikipedia.org/wiki/Ultra_(album)
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| ultra | using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram) |
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| ultra | very high frequency sound |
| ultra | (trade mark) a synthetic suede cloth |
| ultra | radiation lying in the ultraviolet range |
| ultra | having or employing wavelengths shorter than light but longer than X-rays |
| ultra | radiation lying in the ultraviolet range |
| ultra | any source of illumination that emits ultraviolet radiation |
| ultra | radiation lying in the ultraviolet range |
| ultra | radiation lying in the ultraviolet range |
| ultra | any source of illumination that emits ultraviolet radiation |
| ultra | the spectrum of ultraviolet radiation |