What is the difference between 2D, 3D and 4D Ultrasound?

2D is a classic black and white image used for diagnostic scans to evaluate the internal organs and assess for abnormalities. These scans are very helpful medically because a trained sonographer can evaluate the growth of the baby.

3D and 4D ultrasounds render a surface image only which is much more realistic to the inexperienced eye. The only difference between 3D and 4D is that the 3D scan is a still image and the 4D scan captures the baby in live movement.