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![NDI (Northern Digital Inc) on Twitter: "NDI Passive Spheres are compatible with most Image-Guided Surgery (IGS) systems available today and mount to standard snap-on posts. Learn more about the industry's original and NDI (Northern Digital Inc) on Twitter: "NDI Passive Spheres are compatible with most Image-Guided Surgery (IGS) systems available today and mount to standard snap-on posts. Learn more about the industry's original and](https://pbs.twimg.com/media/FLotI2hX0AMm148.jpg:large)
NDI (Northern Digital Inc) on Twitter: "NDI Passive Spheres are compatible with most Image-Guided Surgery (IGS) systems available today and mount to standard snap-on posts. Learn more about the industry's original and
![Working Principle of the novel passive marker with imaginary reflection... | Download High-Resolution Scientific Diagram Working Principle of the novel passive marker with imaginary reflection... | Download High-Resolution Scientific Diagram](https://www.researchgate.net/publication/235221074/figure/fig1/AS:299755189096449@1448478614389/Working-Principle-of-the-novel-passive-marker-with-imaginary-reflection-surface.png)
Working Principle of the novel passive marker with imaginary reflection... | Download High-Resolution Scientific Diagram
![Figure 2 from Identification of spatio-temporal and kinematics parameters for 2-D optical gait analysis system using passive markers | Semantic Scholar Figure 2 from Identification of spatio-temporal and kinematics parameters for 2-D optical gait analysis system using passive markers | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/510e80331da0770917f109b82600ba077843da50/3-Figure2-1.png)
Figure 2 from Identification of spatio-temporal and kinematics parameters for 2-D optical gait analysis system using passive markers | Semantic Scholar
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17 Basic units of active and passive markers equipping the portable... | Download Scientific Diagram
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