Definition: 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.
the discipline (education, history, etc) only; use ULTRASONOGRAPHY or ULTRASONIC THERAPY or specifics treed under them for diagnostic or therapeutic use of ultrasonic waves; the qualifier / ultrasonography is available for use with specific anatomical
