total descendants::0 total children::0 |
google 4d ultrasound -> http://en.wikipedia.org/wiki/3D_ultrasound -> 4D fetal ultrasounds are similar to 3D scans, with the difference associated with time: 4D allows a 3-dimensional picture in real time, rather than delayed, due to the lag associated with the computer constructed image, as in classic 3-dimensional ultrasound. |
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