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A 3D ultrasound is a three dimensional view of the traditional prenatal ultrasound. A 4D ultrasound is a 3D ultrasound in real time, allowing doctors – and parents – to witness the movement of the baby.

A prenatal ultrasound uses high frequency sound waves that are transmitted through the mother’s abdomen. The sound waves echo back and are compiled into an image of the fetus which is shown on the screen.

Rather than sound waves being sent straight down and back, which results in the traditional 2D sonogram, the sound waves are sent at different angles. These waves are then processed by a computer into a 3D image, which has the clarity of a photograph and can be helpful in detecting birth defects.

Not only does a 3D ultrasound give parents a detailed image of their growing baby, this ultrasound can be a useful tool for physicians who need to examine a woman’s endometrial cavity to look for polyps and malformations.