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Ultrasound uses high-frequency sound waves to look at organs and structures inside the body. Health care professionals use them to view the heart, blood vessels, kidneys, liver and other organs. During pregnancy, doctors use ultrasound tests to examine the fetus. Unlike x-rays, ultrasound does not involve exposure to radiation.
During an ultrasound test, a special technician or doctor moves a device called a transducer over part of your body. The transducer sends out sound waves, which bounce off the tissues inside your body. The transducer also captures the waves that bounce back. Images are created from these sound waves.
'''Ultrasound''' is sound with a frequency greater than the upper limit of human hearing, approximately 20 Hertz. Some animals, such as dogs, dolphins, and bats, have an upper limit that is greater than that of the human ear and thus can hear ultrasound. Ultrasound has industrial and medical applications. Medical ultrasonography can visualise muscle and soft tissue, making them useful for scanning the organs, and obstetric ultrasonography is commonly used during pregnancy. Typical diagnostic ultrasound scanners operate in the frequency range of 2 to 13 Hertz. More powerful ultrasound sources may be used to generate local heating in biological tissue, with applications in physical therapy and experimental cancer treatment. Focused ultrasound sources may be used to break up kidney stones or for cataract treatment by phacoemulsification. Ultrasonic cleaners, sometimes called ''supersonic cleaners'', are used at frequencies from 20-40 kHz for jewellery, lens (optics) and other optical parts, watches, dental instruments, surgical instruments and industrial parts. The main mechanism for cleaning action in an ultrasonic cleaner is actually the energy released from the collapse of millions of microscopic cavitation events occurring in the liquid of the cleaner. Home cleaners are available and costs range from approximately US $100. Ultrasound when applied in specific configurations can produce exotic phenomena such as sonoluminescence. These phenomena are being investigated partly because of the possibility of bubble fusion. Ultrasound generator/speaker systems are sold with claims that they frighten away rodents and insects, but there is no scientific evidence that the devices work; controlled tests have shown that rodents quickly learn that the speakers are harmless.
Nuderecords.com Ultrasound - News, biography, images, sounds, and tour information from the band's label.
VH1: Ultrasound - Biography, discography, and links.
Amy's Ultrasound Page - Fan site with pictures, sounds, tour dates, and lyrics.
Kurt Russell by Ultrasound - Lyrics to the song "Kurt Russell" by Ultrasound.
Radiological Books - Books for medical imaging and radiology professionals on continuing education, computed tomography, magnetic resonance, ultrasound, and radiotherapy.
Kennel Silencers - Using ultrasound or water to control barking dogs in a kennel environment. Testimonials and recommended applications.
Stork Radio - Rent or buy Doppler Ultrasound Fetal Heartbeat systems designed for in-home use.
Fetal Bond - Rent or buy a doppler ultrasound to monitor fetal heartbeat.
BabyBeat - Rent or buy a doppler ultrasound to monitor fetal heartbeat.
How Stuff Works: How Ultrasound Works - Illustrated narrative takes you inside the ultrasound machine and shows you how this technique is used to look inside you.