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Ultrasound upgrade produces images that work like 3-D movies

Parents-to-be might soon don 3-D glasses in the ultrasound lab to see their developing fetuses in the womb "in living 3-D, just like at the IMAX movies," according to researchers at Duke University's Pratt School of Engineering.

The same Duke team that first developed real-time, three-dimensional ultrasound imaging says it has now modified the commercial version of the scanner to produce an even more realistic perception of depth. Paired images seem to pop out of the screen when viewed with the special glasses.

The researchers created an updated version of the image-viewing software found on clinical ultrasound scanners, making it possible to achieve a stereo display with no additional hardware.

"To our knowledge, this is the first time it's been made possible to display real-time stereo image pairs on a clinical scanner," said Stephen Smith, a professor of biomedical engineering at Duke. "We believe all 3-D scanners could be modified in this way with only minor software changes."

The new imaging capability can improve the early diagnosis of certain kinds of birth defects of the face and skull and improve surgeons' depth perception during ultrasound-guided medical procedures, including tumor biopsies and robot-assisted surgeries done through tiny "keyhole" incisions.

The Duke team, which also includes Joanna Noble, an undergraduate student, and Matthew Fronheiser, a graduate student in Smith's laboratory, reported the findings in an issue of the journal Ultrasonic Imaging dated July 2006, but published in April 2007. The research was supported by the National Institutes of Health.

Human depth perception is largely the result of stereo vision -- the slightly different perspectives of the same scene that are observed by the left and right eyes, Smith said. The brain processes the information to produce a sense of depth, a phenomenon that can't be achieved when viewing a single, flat image.

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Source:Duke University


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