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Ultrasound uses sound waves to detect what is going on within the body, comprising primarily of a transducer, monitor and computer. The transducer emits sound into the body at different wavelengths, which is then read and interpreted by the computer, ultimately creating an image on the monitor. 2D ultrasound simply provides a 2-dimensional image in black and white, allowing views of internal organs, including those of the developing fetus. 3D/4D ultrasound provides a 3 or 4-dimensional image in colour (sepia) of only the surface. Any movement of the fetus is described as the 4-dimensional image and provides the real time moving image.
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