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3D Against Breast Cancer

Dr. Carl J. D'Orsi, M.D., from the Department of Radiology and Imaging Sciences at Emory University School of Medicine and the Winship Cancer Institute at Emory University, both in Atlanta, GA,USA is testing a new stereoscopic 3D digital mammography technique that has the potential to significantly improve the accuracy of breast cancer screening.

Traditional 2D X-ray mammography, the current primary screening method for early detection of breast cancer in women, is a valuable tool but has some limitations. Surrounding normal tissue can mask lesions, and 2D views do not provide direct information about the volumetric appearance of a detected lesion.

The novel technique called stereoscopic digital mammography (SDM) addresses these limitations by mimicking the way that human eyes work together to form a stereoscopic 3D image. Digital mammography equipment has been modified to allow the X-ray tube to move separately from the signal receiving plate. The resulting images are viewed on a 3D passive PLANAR monitor. SDM has the ability to identify lesions at different depths within the breast volume, potentially reducing both false positive findings and recalls while enabling more accurate diagnosis.

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A stereoscopic 3D mammogram

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Is Variable Frame Rate Better than High Frame Rate for 3D?

In the 24 frames-per-second vs. High Frame Rate (HFR) discussion, both sides have very good and well documented arguments. But Production company FlyFilm (Poland) thought that maybe there is a compromise to be made between that beloved 24 fps film look and lack of jittery motion that you can only get in higher frame rates?

To find out, they did a test and combined standard and high frame rate footage in one shot. They shoot 3D test footage in high frame rate (50fps in our case) and then get rid of every other frame to create 25fps chunks of action in a single 50fps file. You can see the results in the 50 fps video file downloadable here under (SteroscopicPlayer needed) and decide for yourself if FlyFilm managed to create a comfortable viewing experience and image that looks both smooth and cinematic. The test is extensively described here under by its authors, Piotr Kalkowski and Andrzej Stopa from FlyFilm.

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Stereoscopic Viewing and Increased Vision Symptoms

"Stereoscopic Viewing and Reported Perceived Immersion and Symptoms" is a paper published today in the "Optometry & Vision Science" journal  (July 2012 Issue).

Conclusion 1: Stereoscopic 3D viewing provides greater immersion, but it can also lead to heightened visual and motion sickness symptoms.

Conclusion 2: If you are visually perturbed when watching 3D movies, take a seat on the last row.

Stereoscopic 3D displays heighten perceived immersion but also increase viewing symptoms for some viewers. The recently published study measured prevalence and magnitude of perceived immersion and viewing symptoms in stereoscopic viewing, and their relation to viewer's characteristics and viewing position.

"Cloudy with a Chance of Meatballs" was watched by 203 teens and adults  in 2D or stereoscopic 3D while sitting at different angles and distances. Their prior viewing symptoms, as well as visual and physical discomfort immediately before and after viewing, were measured with questionnaires. They were also asked to report their perceived immersion feeling after the viewing.

Among the participants, 12% (after 2D vision) and 21% (after stereoscopic 3D vision) reported increases of measured symptoms during or after viewing; stereoscopic 3D viewing incurred greater and more frequent perception of blurred vision, double vision, dizziness, disorientation, and nausea than 2D viewing.

The symptoms were thus observed 75% more often just after a 3D viewing than after a 2D one. Would results be the same with another movie???

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Are you stereo blind?

Is your stereovision OK or not? Here under is a simple online test in the form of a black circle you have to focus on and a few lines of text explaining what happens (or should happen).... Have your friends pass the test and learn who is stereoblind among them!

According to several recent studies, between 6 and 12% of the world population are stereoblind. But don't worry too much if you are, there are plenty of depth cues in the world that help you appreciate the depth and distance of objects. And you may as well spare a few bucks when going to the movies...


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3D "Dwell Time" explained

Clyde de Sousa from Realvision just published a nice paper explaining why and how 3D is better than 2D and about the special ingredient that contributes to compelling 3D movies… “Dwell Time”.


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