An ultrasound is a diagnostic device that allows for the three dimensional real-time visualization of distant bodily parts and organs. Today ultrasound machines are laptop sized.
Ultrasound works by firing a rapid succession of sounds at the focal point that needs examination. As this sound reverberates back in an echo like fashion, the ultrasound machine can read them and convert them into a picture on a screen. Ultrasound is totally non-evasive and painless.