MS = 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. (Dorland, 28th ed) AN = /adv eff permitted but consider also ULTRASONOGRAPHY /adv eff & ULTRASONIC THERAPY /adv eff; ultrasonic or sonographic imaging of organs is organ /ultrasonogr UI = D014465

Very high frequency sound waves, over 18,000 vibrations per second, traveling through a liquid in which parts are immersed for thorough cleaning.

Ultrasonics is a trade term coined by the Ultrasonic Manufacturers Association and used by its successor, the Ultrasonic Industry Association, to refer to the use of high-intensity acoustic energy to change materials. This usage is contrasted to ultrasound, which is generally reserved for imaging, as in sonar, materials examination (NDI), and diagnostics (mammography, doppler bloodflow, etc.).

the application of ultrasonic energy to do work (specifically as opposed to subsonic, supersonic, or transsonic, q.v.).

the technology associated with the use of sound above 15 kHz. Applied to thickness, density, flow and level sensing. Also used for imaging

Technique for estimating certain aspects of body composition and for pregnancy detection.