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| Diagnostic Medical Sonography
(ultrasonography) is an imaging technique whereby high-frequency acoustic
energy is transmitted into the human body using transducers in contact with the
skin. The ultrasound waves produced by the transducer reflect from boundaries
between organs and surrounding fluid, and between regions of differing tissue
density and are used to visualize subcutaneous body structures including
tendons, muscles, joints, vessels and internal organs for
possible pathology. |
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| Obstetric sonography is routinely
employed during pregnancy to observe the condition and behavior of fetuses
prior to birth and there are a numerous diagnostic and therapeutic applications
practiced in medicine. |
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| In physics the term 'ultrasound'
applies to all acoustic energy with a frequency above human hearing (20
kilohertz). Typical diagnostic sonographic scanners operate in the frequency
range of 2 to 18 megahertz, hundreds of times greater than the limit of human
hearing. |
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