2D ultrasound creates the traditional black-and-white images most parents recognize. 3D ultrasound adds depth to create still images of your baby’s features. 4D ultrasound shows those 3D images in motion, so you may see baby stretching, yawning, smiling, or moving their hands. HD imaging uses advanced lighting and rendering to create a more detailed, realistic view when baby’s position allows.At True Ultrasound, image quality depends on factors such as gestational age, baby’s position, placental location, and the amount of fluid around baby’s face.