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The method know as three dimensional ultrasound is that can be used when a woman is in early pregnancy, it provides 3d images of the fetus. Most of the time the ultrasound samples are collected and joined together and animated to make a 4d ultrasound scan. Three dimensional scans works in a similar way to the normal ultrasound methods except that the ultrasound scanning waves are sent from multiple directions. The ultrasound pulses can be redirected back then captured to provide information to construct a 3 d image in in the same way as 3d pictures. 3d ultrasound was started by stephen smith and olaf von ramm. It is important to understand that sonologists everywhere always pictured three-dimensional images of the body in their minds while carrying out 2d scans. However, until recently it was very difficult to do this type of reconstruction on patient data acquired using ultasound scanning. With the introduction of 3d/ 4d ultrasound for the first time allowed us a peek into the thinking of a sonologist and hence letting us view 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 ultasound scanning, its use in non-medical situations needs to be undertaken with an understanding of the risks that exist.
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