The method know as 3d ultrasound is that can be used during early pregnancy, it provides 3d images of the unborn baby. Most of the time these pictures are collected and joined together and made into a movie to make a 4d ultrasound scan.

Three dimensional scanning works in the same manner to the usual scanning methods except that the ultrasound pulses can be directed from multiple directions. The ultrasound waves can be redirected back and captured and provide information to construct a 3d image in in the same way as 3d pictures. 3d ultrasound was devised by olaf ramm abs stephen smith.

It is important to understand that sonologists everywhere always pictured 3d pictures of anatomy or pathology in their minds whilst doing 2d scans. However, until recently it was not possible to do this kind of reconstruction on patient data acquired using ultasound scanning. With the advent of ultrasound baby scans for the first time allowed us a peek into the thinking of a sonologist and allowing us to reconstruct 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 harm due to 3d ultrasound, its use in none medical situations needs to be undertaken with an understanding of the risks.