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Nationwide Children's Hospital (formerly Columbus Children's Hospital) is a nationally ranked pediatric acute care teaching hospital located in the Southern Orchards neighborhood of Columbus, Ohio.
Ultrasound energy is transferred based on the frequency and power output of the ultrasonic waves that an ultrasound machine or device creates. Home ultrasound machines and doctor's office machines both operate between 1 and 5 megahertz , however, home machines utilize pulsed ultrasonic waves while professional ultrasound machines in a doctor's ...
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.
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As of May 2019, twelve states required people seeking an abortion to have an ultrasound before being allowed to have the procedure. This number was 26 in September 2020. 14 states required people to be issued with ultrasound information in May 2019. [23] Mandatory transvaginal ultrasounds have been particularly controversial. [24]
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.