What is 4D ultrasound scan?

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What is 4D scan or 4D ultrasound? What is the difference between 3D and 4D? Educational video clip about medical ultrasound technology:
2D - is real-time and uni-planar image of the fetus
3D - is still volume, and it is created from multiple 2D pictures of the baby
4D - is moving in real-time 3D image of the fetus

Видео What is 4D ultrasound scan? канала ultrasoundlink