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4D ultrasound (also known as 3D/4D ultrasound) is the technology used by sonographers during pregnancy to evaluate the unborn fetus. This process provides physicians and expecting mothers with animated 3D images of the fetus. For over 35 years, obstetricians have used 2D ultrasound technology during pregnancies, but 3D/4D technology is becoming increasingly available.

2D ultrasound works by directing ultrasound waves (ultrasonic sound waves) straight down on the area being examined. These waves are reflected back up and recorded, providing the viewer with a 2D, black and white picture of the fetus.

3D ultrasound works in a similar fashion 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.

4D ultrasound procedures are the process of streaming 3D images into an animated video.

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What is the difference between ultrasounds, sonograms, 2D ultrasounds, and 3D/4D ultrasounds?

Ultrasound is the technology/machine that allows you to view your baby during pregnancy.

A sonogram is the picture taken of your baby during the ultrasound. A sonogram is a "still-shot" image of your baby.

2D ultrasounds work by directing ultrasound waves (ultrasonic sound waves) straight down on the area being examined. These waves are reflected back up and recorded, providing the viewer with a 2D, black and white picture of the fetus.

4D ultrasounds take 3D ultrasound images, or 3D sonograms, and adds the element of time to the process. The added element streams 3D images into a live action animated video of your baby. The procedure is often referred as prenatal imaging, 3D imaging, a 3D scan, or a 4D scan.