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| rdfs:comment | - Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults and thus, 20 kHz serves as a useful lower limit in describing ultrasound.
- Ultrasound imaging (sonography) uses high-frequency sound waves to view soft tissues such as muscles and internal organs. Because ultrasound images are captured in real-time, they can show movement of the body's internal organs as well as blood flowing through blood vessels. In an ultrasound exam, a hand-held transducer is placed against the skin. The transducer sends out high frequency sound waves that reflect off of body structures. The returning sound waves, or echoes, are displayed as an image on a monitor. The image is based on the frequency and strength (amplitude) of the sound signal and the time it takes to return from the patient to the transducer. Unlike with an x-ray, there is no ionizing radiation exposure with this test.
- Ultrasound is a radiological procedure that uses sound waves with a frequency well above the range of human hearing that can penetrate under the skin and, much like sonar, reflect off structures within the body, producing an image that can be used to diagnose illness. An image taken with ultrasound equipment is a sonogram.
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| abstract | - Ultrasound is a radiological procedure that uses sound waves with a frequency well above the range of human hearing that can penetrate under the skin and, much like sonar, reflect off structures within the body, producing an image that can be used to diagnose illness. An image taken with ultrasound equipment is a sonogram. Because the sound waves are harmless, the procedure can be used on any patient, even pregnant women (who can't have X-Rays) or persons with metal pins in their body (who can't have an MRI). However, the penetration of the waves is limited to the first few inches below the skin, and as such cannot be used to scan structures deep inside the body, such as bones. However, they are very useful for looking for problems in the digestive tract and the organs that are close to the skin, such as the liver and kidneys.
- Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults and thus, 20 kHz serves as a useful lower limit in describing ultrasound.
- Ultrasound imaging (sonography) uses high-frequency sound waves to view soft tissues such as muscles and internal organs. Because ultrasound images are captured in real-time, they can show movement of the body's internal organs as well as blood flowing through blood vessels. In an ultrasound exam, a hand-held transducer is placed against the skin. The transducer sends out high frequency sound waves that reflect off of body structures. The returning sound waves, or echoes, are displayed as an image on a monitor. The image is based on the frequency and strength (amplitude) of the sound signal and the time it takes to return from the patient to the transducer. Unlike with an x-ray, there is no ionizing radiation exposure with this test.
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