| Ultrasound, or sound waves with frequencies above detection by the human ear, is commonly used in obstetrics to diagnose both the age and health of the developing fetus. An ultrasound-emitting device called a transducer is placed against the skin of the pregnant woman’s abdomen. The sound waves reflect in varying degrees when they contact tissues of different density and elasticity. The pattern of echoes is detected by the transducer and is converted into a moving image seen on a monitor. Outside of obstetrics, it is used to detect tumors, damage, or abnormalities in the liver, kidney, ovaries, eyes, and other organs. |
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