Ultrasound is sound with frequencies greater than 20 kHz. This frequency is the approximate upper audible limit of human hearing. Ultrasound or ultrasonic may also refer to: Imaging and measurement Medical ultrasonography, an ultrasound-based diagnostic imaging technique Ultrasound computer tomography, utilizing ultrasound waves as physical phenomenon for imaging Ultrasound tongue imaging, imaging technique Ultrasound transmission tomography, a form of tomography involving ultrasound Media and art Ultra-Sonic (band), a Scottish dance group Ultrasonic (film), a 2012 American independent film Ultrasound (film), a 2021 American science fiction film Ultrasonics (journal), a bimonthly peer reviewed scientific journal Ultrasound (band), a rock band Other uses Ultrasonic antifouling, a technology that helps reduce fouling on underwater structures Ultrasonic cavitation device, a surgical device to dissect or fragment tissues with low fiber content Ultrasonic cleaning, ultrasound and an appropriate solvent to clean items Ultrasonic drug delivery, ultrasound to enhance the transport of molecules into or through biological tissue Ultrasound energy, mechanical energy called sound characterized by vibrating or moving particles within a medium Ultrasonic grating, diffraction grating produced by interfering ultrasonic waves Ultrasonic hearing, auditory effect which allows humans to perceive sounds of a much higher frequency than would ordinarily be audible Ultrasonic horn, a tapering metal bar commonly used for augmenting the oscillation displacement amplitude Ultrasonic motors, a type of motor that utilizes ultrasonic vibrations Ultrasonic sensors, and transducers which use ultrasound to measure distance and velocity Ultrasonic soldering, a flux-less soldering process that uses ultrasonic energy Ultrasonic testing, a technique of non-destructive testing Ultrasonic thickness gauge, a measuring instrument for the non-destructive investigation of a material's thickness Ultrasonic welding, ultrasonic acoustic vibrations to create a solid-state weld Ultrasound avoidance, reflex displayed by certain animal species that are preyed upon by echolocating predators Gravis Ultrasound, a sound card for the PC See also