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Medical ultrasonography.
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Ultrasound Devices
Before World War II, there was no way to accurately diagnose the condition of a fetus without surgery--a procedure that was extremely risky for both the mother and the unborn child....
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Ultrasound and Ultrasonography
Ultrasound is the term used for vibrations at higher frequencies than the human ear can hear. Generally, the upper end of the range of human hearing occurs at 20 kHz, or...
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Ultrasound Devices
Ultrasound and Ultrasonography
