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.
Stereoscopic images solve that problem by taking two "snapshots" of the same object from slightly different angles, mimicking the normal difference between left and right eye views.
Special glasses or goggles can then be used to fuse the two images into one, gaining a 3-D effect. This principle lies behind 3-D movies and the familiar Fisher Price View-Master toy. With practice, some people can "defocus" their eyes and fuse the paired images without the aid of any special viewing device. (Find out how at
http://en.wikipedia.org/wiki/Stereoscopy.)
To demonstrate the new capability, the researchers first generated stereo ultrasound images of a small metal cage. They then advanced to ultrasound images in living animals of a heart valve and blood vessels and needle biopsies of the animals' brains and esophagi.
The researchers have since recorded ultrasound images of a model human fetus that is traditionally used in the testing of fetal ultrasound imaging devices. (Watch the video, including paired images of both the cage and model fetus, at
http://youtube.com/watch?v=4VSRlH01mzg. See if you can fuse them without goggles.)
"Thousands of 3-D ultrasound systems in clinics could be upgraded with such new software, and stereoscopic goggles could be issued to them as well," Smith said. "Keepsake DVDs of the fetal exam could also be viewed at home in 3-D stereo."
The goggles would soon become obsolete, he added. New monitors capable of fusing stereo 3-D images without them are now in development.
Source: Duke University
Related stories:
First steps toward autonomous robot surgeries
The day may be getting a little closer when robots will perform surgery on patients in dangerous situations or in remote locations, such as on the battlefield or in space, with minimal human guidance.
New 3-D ultrasound could improve stroke diagnosis, care
Using 3-D ultrasound technology they designed, Duke University bioengineers can compensate for the thickness and unevenness of the skull to see in real-time the arteries within the brain that most often clog up and cause strokes.
High-energy ultrasound sharpens view of liver tumors
A high-energy form of ultrasound imaging developed by researchers at Duke University's Pratt School of Engineering produces pictures of liver tumors that are better than those made with traditional ultrasound, according to results of a clinical study.
3-D ultrasound scanner provides in-depth view of the brain
Biomedical engineers at Duke's Pratt School of Engineering have adapted a three-dimensional ultrasound scanner that might guide minimally invasive brain surgeries and provide better detection of a brain tumor’s location.
Duke engineers develop new 3-D cardiac imaging probe
Biomedical engineers at Duke University's Pratt School of Engineering have created a new three-dimensional ultrasound cardiac imaging probe. Inserted inside the esophagus, the probe creates a picture of the whole heart in the time it takes for current ultrasound technology to image a single heart cross section.
3-D mammograms, cameras may improve breast exams
(AP) -- Remember peeking through a View-Master? Scientists are using the same concept behind the classic kids' toy to try to see mammograms in 3-D. The goal: A better way to check for breast cancer in women with breasts too dense for today's mammograms to give a clear picture.
Experimental phone network uses virtual sticky notes
The rapid convergence of social networks, mobile phones and global positioning technology has given Duke University engineers the ability to create something they call "virtual sticky notes," site-specific messages that people can leave for others to pick up on their mobile phones.
New research shows how aging brain brings a healthy dose of perspective
A University of Alberta researcher in collaboration with researchers from Duke University has proven that wisdom really does come with age, at least when it comes to your emotions.