Timing is everything

Is timing everything for 3D and 4D scans?

At the 19 week morphology scan (see our post on what is a morphology scan – link to corporate blog post) your baby is about 18cm in length and doesn’t have the chubby facial features yet. A 3D image at this early stage will appear quite skeletal and whilst we think they still look gorgeous at this stage, it isn’t always what parents expect. We suggest that the best time to perform a 3D and 4D imaging scan is between 28 – 32 weeks. It is at the 28 week mark that your baby will start to gain the chubby cheeks and hopefully contribute to some beautiful picturesThi dependant on the other factors affecting imaging quality (see our post on “what’s in a clear picture?”) There is a small window where we can usually get some great momentos for you but there is a fine line between baby not being big enough to get the gorgeous chubby cheeks and as baby grows nestling right into the uterus wall or placenta.
Little boy hugging his mother belly.

What is the difference between 2D and 3D… oh, and 4D?

What’s in a dimension?

We use 2D or 2 dimensional ultrasound imaging for all medical ultrasound scans. This is used not only to look at pregnancies and assess the wellbeing and growth of a baby, but at Sound Radiology we also use it to look at organs (such as kidneys, liver), blood vessels throughout the body, muscle and tendon problems, breast imaging and use it to guide biopsies and treat some problems with injections. 2D imaging is the black and white single view image that you see. The 3D or 3 dimensional image is where the specialised ultrasound probe is able to collect consecutive data and reconstruct it into a surface view or 3D view across an area, such as your baby’s face. 4D or 4 dimensional is the 3D view in real time allowing us to watch the expressions on your baby’s face, yawning and watch how your baby moves. The 3D and 4D ultrasound baby images are best seen later in the pregnancy when your baby’s features are prominent. See our blog on the best times for 3D and 4D scans.


4D ultrasound scan