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Ultrasound
What is an Ultrasound Examination?
Ultrasound imaging employs a special machine that generates very high frequency sound waves
that are projected into the body. The machine uses a sophisticated computer to convert the
echoes from these sound waves into cross-sectional pictures, using principles similar to sonar.
The ultrasound machine constructs both live video and still pictures of the body area being
scanned. No ionizing radiation is used, and the power levels of the ultrasound machine are
too low to be felt. Ultrasound is believed to be safe for imaging the human fetus (hence the
use of ultrasound for prenatal diagnosis).
Preparing for Ultrasound Examinations
Most ultrasound exams require no specific preparation. Some examinations of the abdomen
require fasting for several hours prior to the study. Ultrasound examinations of the female
pelvis may require drinking water before the study to fill the bladder. You will be notified
of any specific requirements.
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