A guidance document available from the 'Center for Devices and Radiological Health, U.S. Food and Drug Administration', which provides information for manufacturers seeking U.S. marketing clearance of diagnostic ultrasound systems and transducers.

Ultraharmonic is an oscillation at a frequency that is a rational multiple of that of its fundamental sinusoidal oscillation, for example 1.5 or 2.5 times the fundamental frequency. Ultraharmonic imaging is a method to eliminate tissue artifacts and therefore increase contrast to tissue ratio.
Also called Superharmonic Imaging.

See also Power Modulation.

'Ultralink LLC is a medical imaging company based in St. Petersburg, Florida. We are committed to designing and providing advanced diagnostic ultrasound eye imaging systems to the worldwide health care community.
Ultralink developed the world's first very high frequency (VHF) digital ultrasound eye scanner - the Artemis. Our advanced patented technology provides images of the cornea and anterior segments of the human eye with unparalleled resolution. Further applications of this technology are being explored, to complement its value in the fields of refractive surgery and refractive implants.'

Ultrasound Systems:

Ultrasonic or ultrasound relates to energy waves of high frequencies above 30,000 Hz similar to those of audible sound.

(UCA / USCA) Ultrasonic contrast agents, also called ultrasound contrast agents, are encapsulated bubbles on the order of 1-10 μm in diameter. These gas bubbles are injected into the blood stream in order to increase blood/ tissue contrast during an ultrasonogram. These microbubbles are filled with air or a gas with a lower solubility in blood than air, such as perfluorochemicals. The microbubble shell consists of albumin, phospholipid, or other material and encapsulates the gas core. Due to this construction, ultrasonic contrast agents are highly compressible, and have a high echogenicity.

See also Ultrasound Contrast Agent Safety.