- High-frequency sound waves. Ultrasound waves can be bounced off of tissues using special devices. The echoes are then converted into a picture called a sonogram. Ultrasound imaging, referred to as ultrasonography, allows physicians and patients to get an inside view of soft tissues and body cavities, without using invasive techniques. Ultrasound is often used to examine a fetus during pregnancy. There is no convincing evidence for any danger from ultrasound during
* * *- diagnostic u. the use of u. to obtain images for medical diagnostic purposes, employing frequencies ranging from 1.6 to about 10 MHz.
* * *ul·tra·sound 'əl-trə-.sau̇nd n1) vibrations of the same physical nature as sound but with frequencies above the range of human hearing compare INFRASOUND2) the diagnostic or therapeutic use of ultrasound and esp. a noninvasive technique involving the formation of a two-dimensional image used for the examination and measurement of internal body structures and the detection of bodily abnormalities called also echography, sonography, ultrasonography3) a diagnostic examination using ultrasoundultrasound adj of, relating to, performed by, using, or specializing in ultrasound <an \ultrasound technician> <\ultrasound imaging>
* * *n.sound waves of extremely high frequency (above 20,000 Hz), inaudible to the human ear. Ultrasound, usually in the range 2-20 MHz, can be used to produce images of the interior of the human body, in the same way that X-rays can be used to build up pictures, but with the advantages that the patient is not submitted to potentially harmful ionizing radiation and that structures not opaque to X-rays can be seen (see ultrasonography). The vibratory effect of ultrasound can also be used to break up stones in the kidney or elsewhere (see lithotripsy) and in the treatment of rheumatic conditions and cataract (see phacoemulsification). Ultrasonic instruments are used in dentistry to remove calculus from the surfaces of teeth and to remove debris from the root canals of teeth in root canal treatment.
* * *ul·tra·sound (ulґtrə-sound) 1. sound waves with a frequency above the range of human hearing (greater than 20,000 Hz); see ultrasonics. 2. ultrasonography.
Medical dictionary. 2011.
Look at other dictionaries:
ultrasound — 1923, from ULTRA (Cf. ultra ) + SOUND (Cf. sound). Cf. ULTRASONIC (Cf. ultrasonic). In reference to ultrasonic techniques of detection or diagnosis it is recorded from 1958 … Etymology dictionary
ultrasound — ► NOUN ▪ sound or other vibrations having an ultrasonic frequency, particularly as used in medical imaging … English terms dictionary
ultrasound — [ul′trə sound΄] n. 1. ultrasonic waves, used in medical and dental diagnosis and therapy, in cleaning and detecting flaws in metal, etc. 2. the use of ultrasonic waves in ultrasonography to form images of interior body organs, as the uterus or… … English World dictionary
Ultrasound — Not to be confused with Supersonic .Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy,… … Wikipedia
ultrasound — /ul treuh sownd /, n. 1. Physics. sound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing. 2. Med. the application of ultrasonic waves to therapy or diagnostics, as in deep heat treatment of a joint or… … Universalium
ultrasound — ultrasonic waves; n. sound waves of high frequency (above 20 kHz), inaudible to the human ear. Ultrasound in the range 2–20 MHz can be used to produce images of the interior of the human body as the waves reflect off structures back to the probe… … The new mediacal dictionary
ultrasound — ul|tra|sound [ ʌltrə,saund ] noun uncount a way of producing an image of an organ inside someone s body using sound waves: Ultrasound was used to show the size of the tumor. a. ultrasound or ultrasound scan a process in which a part of someone s… … Usage of the words and phrases in modern English
ultrasound — UK [ˈʌltrəˌsaʊnd] / US noun [uncountable] medical a) a way of producing an image of an organ inside someone s body using sound waves Ultrasound was used to show the size of the tumour. b) ultrasound or ultrasound scan a process in which a part of … English dictionary
ultrasound — [[t]ʌ̱ltrəsaʊnd[/t]] N UNCOUNT: usu N n Ultrasound is sound waves which travel at such a high frequency that they cannot be heard by humans. Ultrasound is used in medicine to get pictures of the inside of people s bodies. I had an ultrasound scan … English dictionary
ultrasound — noun Date: 1923 1. vibrations of the same physical nature as sound but with frequencies above the range of human hearing 2. the diagnostic or therapeutic use of ultrasound and especially a noninvasive technique involving the formation of a two… … New Collegiate Dictionary