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The method know as three dimensional ultrasound is used in early pregnancy, it provides 3d images of the fetus. Most of the time these pictures are collected and joined together to created a “4d ultrasound”.

Three dimensional scanning works similarly to the usual ultrasound methods except that the ultrasound scanning pulses can be sent from many directions. The ultrasound pulses are reflected back then captured to provide info to construct a 3d picture in much the same way as 3d pictures. 3d ultasound scanning was started by stephen smith and olaf von ramm at duke university.

It is important to understand that sonologists all over the world always pictured 3d pictures 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 info using ultasound scanning. With the introduction of baby scans for the first time allowed us a view into the thinking of a sonologist and hence letting us see the images on the ultrasound machine.

3d 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 ultasound scanning, its use in non-medical situations needs to be undertaken with the understanding that a risk may exist.

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