A subfield of acoustics dealing in the radio frequency range higher than acoustic
SOUND waves (approximately above 20 kilohertz). Ultrasonic radiation is used therapeutically
(DIATHERMY and ULTRASONIC THERAPY) to generate HEAT and to selectively destroy tissues.
It is also used in diagnostics, for example, ULTRASONOGRAPHY; ECHOENCEPHALOGRAPHY;
and ECHOCARDIOGRAPHY, to visually display echoes received from irradiated tissues
Note générale sur le champ d'application :
the discipline (education, history, etc.) only; use ULTRASONOGRAPHY or ULTRASONIC
THERAPY or specifics for diagnostic or therapeutic use of ULTRASONIC WAVES