It is a technique that creates images on the screen of internal organs, tissue, or a fetus by means of sound waves and computer technology. These images can be printed on photographic paper. The ultrasound waves are transmitted through a hand-held device transducer, which the ultrasound professional moves over the abdomen to get the desired image on the screen.

 

 With three-dimensional (3D) ultrasound technology, the transducer performs a series of scans very rapidly from different angles, which are then electronically composed into one 3D picture. 3D provides a realistic and clear view of the baby. Since eventual movements of the baby will also be captured, this technique is also referred to as 3D/4D ultrasound.