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Ultrasound. Sonograms ... The first ultrasound used for gynelogical purposes
was not used until 1955, by Professor Ian Donald. Professor ...
Ultrasound. Ultrasound What is Ultrasound? Ultrasound or ultrasonography is a
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Ultrasound ? Quick Project. ... Humans can hear sound within the frequency range of
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Ultrasound. ARDMS The Ultra Sound Choice What is ARDMS? To those people not
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Medical Physica Ultrasound. ... Ultrasound Sounds, including ultrasounds, are mechanical
longitudinal waves, meaning they are created by vibrations in a medium. ...
Submitted by Chicawhapa on April 20, 2008
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Ultrasound
What is Ultrasound?
Ultrasound or ultrasonography is a medical imaging technique that uses high frequency sound waves. It is a high pitch frequency that can not be heard by the human ear.
• In ultra sound the following happens:
• High frequency sound pulses (1-5megahertz) are transmitted from the ultrasound machine into your body using a probe.
• The sound wave will travel into your body until it hits an object such as soft tissue and bone.
• When the sound wave hits these objects some of the wave will be reflected back to the probe. While some waves may carry on further till they hit another object and then reflected back.
• The probe picks up these reflected sound waves and relays them to the machine.
• The distance and time from the probe, to where the sound wave was reflected, to when the echo is received back is calculated by the machine.
• A two dimensional image like below is produced displaying the distances on the screen.
Ultrasound Image
Taken from (Freudenrich, C, 1998)
How an Ultrasound machine works?
An ultrasound machine is made up of many parts:
The Transducer Probe
The probe is responsible for sending and receiving of the waves. It is the main part of the machine. The probe generates and receives the waves by the principle of piezoelectric effect. This was discovered in 1880 by Pierre and Jacques Curie. The probe contains one or more quartz crystals called piezoelectric crystals. When these crystals are cut to a specific shape they become an important part of the ultrasound system. They can contract in one direction and expand in another when an alternating electric current is passed through the crystal. Each Piezo-electrical crystal has its own resonant frequency and when the electric current is applied, it will oscillate and vibrate at that exact frequency....
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