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The method know as 3d ultrasound scanning is used in early pregnancy, it provides 3d pictures of the fetus. Most of the time these pictures are collated and combined and animated to produce a “4d ultrasound”.
Three dimensional scans works in the same way to the normal scanning methods except that the ultrasound scanning waves are sent from multiple directions. The waves can be redirected back and captured and provide information to construct a 3-dimensional picture in very much the same way as 3d movies. 3 dimesional ultrasound was started by stephen smith and olaf von ramm.
It’s important to understand that sonologists all over the world always pictured 3d images of anatomy or pathology in their minds whilst doing 2d scans. However, until recently it was very difficult to do this kind of reconstruction on on data using ultrasound. With the introduction of baby scans for the first time allowed us a peek into the thinking of a sonologist and so letting us see the images on the ultrasound machine.
4d ultrasound imaging should utilize ultrasound energy following the same limits as conventional 2d ultrasound to create the 3d images. There is no data to suggest any harm due to 3d ultrasound, its use in non-medical situations should be undertaken with the understanding of the risks.
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