Did you know?
Ultrasound is an imaging technique that uses high-frequency sound waves, which are not radiative. Providing a high level of safety, ultrasound helps to get images of an internal body structure in 2D. A 3D ultrasound controls multiple 2-dimensional images in different planes in order to create images with a depth dimension. Note that they are all still images. 4D ultrasound is developed by adding the element of motion to 3D ultrasound images to enable the visualization of the fetus and its movement in the womb.