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Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or less. Ultrasound can be generated at very high frequencies; ultrasound is used for sonochemistry at frequencies up to multiple hundreds of kilohertz.
Medical ultrasound includes diagnostic techniques (mainly imaging techniques) using ultrasound, as well as therapeutic applications of ultrasound. In diagnosis, it is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs, to measure some characteristics (e.g., distances and velocities) or to generate an informative audible sound.
The ADR 2130, designed by Marty Wilcox was the first portable ultrasound unit commercially available in the United States, being released in 1975. This unit weighed about 25 lbs, had 3 linear probes to choose from and used an oscilloscope for a display instead of a TV monitor. [ 1 ]
Polaroid photograph of an obstetric ultrasound taken in 1985. Scottish physician Ian Donald was one of the pioneers of medical use of ultrasound. His article "Investigation of Abdominal Masses by Pulsed Ultrasound" was published in The Lancet in 1958. [29] Donald was Regius Professor of Midwifery at the University of Glasgow. [30] [self ...
Ultrasound is also limited by its inability to image through air pockets (lungs, bowel loops) or bone. Its use in medical imaging has developed mostly within the last 30 years. The first ultrasound images were static and two-dimensional (2D), but with modern ultrasonography, 3D reconstructions can be observed in real time, effectively becoming ...
Where is Wapakoneta, Ohio? Wapakoneta is in Auglaize County in western Ohio. It's about 90 miles northwest of Columbus. The suspected tornado was spotted at 7:43 p.m. Thursday traveling southeast ...
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The Lincoln Highway's arrival in Ohio was a major influence on the state's development. Upon the advent of the federal numbered highway system in 1926, the Lincoln Highway through Ohio became U.S. Route 30. Ohio is home to 228 miles (367 km) of the National Road, now U.S. Route 40. Ohio has a highly developed network of roads and interstate ...