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Cross-Sections and Nets

Cross-sections are intersections of a plane with a solid, and nets are unfolded, flat representations of the sides of a 3-D shape.

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Womb with a View

Do you know anyone who’s had a baby?  At some point in her pregnancy, she probably had an ultrasound, a medical test that enables doctors to detect health problems and birth defects. It also gives mothers a chance to get the first snapshots of their new baby.

Cross-Sections for Clarity

Traditional 2D ultrasounds can be difficult to read; every baby looks the same on them. Sometimes, the technician must add labels to the display to help parents see where their baby’s head is and where the feet are. Newer ultrasound machines use cross-sections to create 3D and 4D ultrasounds. To create a 3D ultrasound, a computer uses imaging software to compile all the “flat” images of the baby into a three-dimensional picture. 4D ultrasounds rely on even faster computers and can show parents the baby’s movements in real time.

Doctors use 3D and 4D ultrasounds to check for heart defects, cleft palates, and spinal defects. Currently, some medical centers can perform prenatal surgeries to treat these conditions. This means that surgeons can operate while a baby is still inside his or her mother. In the future, these surgeries may become more common, enabling doctors to prevent birth defects.

See for yourself: http://www.youtube.com/watch?v=hwKXYIiUUmo

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Watch the following video for a look inside the womb and another example of prenatal surgery.

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