Ultrasound is a non-invasive medical imaging procedure used to diagnose, treat and prevent medical conditions relating to organs or systems in the body.  During the examination, a sonographer uses a transmitting device called a transducer to send out high-frequency ultrasound waves. These harmless sound waves, which contain no radiation, bounce off the surfaces of the object they hit. The reflected sound forms an echo, and that echo is turned into a visual representation on a screen.