Ultrasound has been available commercially since the 1960s, however, it was not widely accepted for medical imaging until the mid-1970s, when technical advances contributed to better image quality.

The latest advances in ultrasound are 3D and 4D imaging. To create 3D images, an ultrasound system determines the volume of a subject - for example, a baby. The system then reconstructs the image in three dimensions. As for 4D Ultrasound, only the Voluson 730 can gather 3D volumes and instantly reconstruct them into moving images.

2D	3D	4D
2D Fetal Profile	3D Fetal Profile	4D Fetal Profile