Related topics from Britannicaultrasound
in medicine, the use of high-frequency sound (ultrasonic) waves to produce images of structures within the human body. Ultrasonic waves are sound waves that are above the range of sound audible to ...
pregnancy
The use of high-frequency sound waves to produce a graphic image of the growing fetus-ultrasonography-is becoming a ubiquitous tool in prenatal medicine, furnishing information on the morphological ...
ultrasonics
Although ultrasound competes with other forms of medical imaging, such as X-ray techniques and magnetic resonance imaging, it has certain desirable features-for example, Doppler motion study-that the ...
ultrasonics
The chemical effects of ultrasound arise from an electrical discharge that accompanies the cavitation process. This forms a basis for ultrasound's acting as a catalyst in certain chemical reactions, ...
ultrasonics
Because ultrasound is a mechanical vibration and can be well focused at high frequencies, it can be used to create internal heating of localized tissue without harmful effects on nearby tissue. This ...
Hess, Orvan Walter
American obstetrician and gynecologist (b. June 18, 1906, Margaretville, N.Y.-d. Sept. 6, 2002, New Haven, Conn.), developed the first fetal heart monitor, at the Yale University Medical School, in ...
radiology
branch of medicine using radiation for the diagnosis and treatment of disease. Radiology originally involved the use of X rays in the diagnosis of disease and the use of X rays, gamma rays, and other ...
therapeutics
Some tumours are more sensitive than the surrounding healthy tissue to temperatures around 43 C (109.4 F). Sensitivity to heat is increased in the centre of tumours, where the blood supply is poor ...
diagnosis
The echocardiogram is a noninvasive technique used to record the structure of the heart by using ultrahigh-frequency sound waves. A transducer placed on the chest wall emits a short burst of ...
ultrasonics
Much medical diagnostic imaging is carried out with X-rays. Because of the high photon energies of the X-ray, this type of radiation is highly ionizing-that is, X-rays are readily capable of ...
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