3D ultrasound works similarly to the traditional ultrasound except that the ultrasound waves are directed from multiple angles. The waves are reflected back and captured and together provide enough information to construct a 3-dimensional image in much the same way as 3D movies. 3D Ultrasound was first developed by Olaf von Ramm and Stephen Smith at Duke University in 1987 [2].

The 3D/4D ultrasound imaging should utilize ultrasound energy subject to the same limits as conventional (2D) ultrasound to create the 3D images.[1]