Ultrasound: MedlinePlus Medical Encyclopedia

26 Oct.,2023

 

An ultrasound machine makes images so that organs inside the body can be examined. The machine sends out high-frequency sound waves, which reflect off body structures. A computer receives the waves and uses them to create a picture. Unlike with an x-ray or CT scan, this test does not use ionizing radiation.

The test is done in the ultrasound or radiology department.

  • You will lie down for the test.
  • A clear, water-based gel is applied to the skin on the area to be examined. The gel helps with the transmission of the sound waves.
  • A handheld probe called a transducer is moved over the area being examined. You may need to change position so that other areas can be examined.

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