An ultrasound scan, also referred to as a sonogram, diagnostic sonography, and ultrasonography, is a device that uses high-frequency sound waves to create images of the inside of the body.

Because sound waves are used instead of radiation, ultrasound scans are safe. Obstetric sonography is frequently used to check the baby in the womb.

The procedure is called an ultrasound scan and the image produced is a sonogram.

Ultrasound scans can be used to detect problems in the liver, heart, kidney, or abdomen. They may also be useful for a surgeon performing certain types of biopsies.

The word “ultrasound,” in physics, refers to sound with a frequency that humans cannot hear. In diagnostic sonography, the ultrasound is usually between 2 and 18 megahertz. Higher frequencies provide better quality images but are more readily absorbed by the skin and other tissue, so they cannot penetrate as deeply as lower frequencies. Lower frequencies can penetrate deeper, but the image quality is inferior.

How ultrasound scans work

A small device called an ultrasound probe is used, which gives off high-frequency sound waves.

You can’t hear these sound waves, but when they bounce off different parts of the body, they create “echoes” that are picked up by the probe and turned into a moving image.

This image is displayed on a monitor while the scan is carried out.