In short, 4D ultrasound imaging is a 3D ultrasound in live motion. 4D ultrasounds utilize either a 2D transducer, which rapidly acquires 20-30 volumes or a matrix array, which instead uses a 3D ...

A 3D scan shows still pictures of your baby in three dimensions but a 4D scan shows moving 3D images of your baby, with time being the fourth dimension. The 4D scans are best performed from 24 to ...