Ultrasound uses high-frequency sound waves to look at organs and structures inside the body.  Health care professionals use them to view the heart, blood vessels, kidneys, liver and other organs.  During pregnancy, doctors use ultrasound tests to examine the fetus.  Unlike x-rays, ultrasound does not involve exposure to radiation.
 
During an ultrasound test, a special technician or doctor moves a device called a transducer over part of your body.  The transducer sends out sound waves, which bounce off the tissues inside your body.  The transducer also captures the waves that bounce back.  Images are created from these sound waves.

How does an ultrasound work?

For ultrasound testing, gel or oil is applied to the skin to help transmit the sound waves.  A small, handheld instrument called a transducer is passed back and forth over the area of the body that is being examined.  The transducer sends out high-pitched sound waves (above the range of human hearing) that are reflected back to the transducer.  A computer analyzes the reflected sound waves and converts them into a picture that is displayed on a TV screen.  The picture produced by ultrasound is called a sonogram, echogram, or ultrasound scan.  Pictures or videos of the ultrasound images may be made.
 
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