We correct an error in our previously published manuscript [Opt. Express27, 16847 (2019)10.1364/OE.27.016847].
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We correct an error in our previously published manuscript [Opt. Express27, 16847 (2019)10.1364/OE.
View Article and Find Full Text PDFObjective: In minimally invasive surgery (MIS), in situ augmented reality (AR) navigation systems are usually implemented using a glasses-free 3D display to represent the preoperative tissue structure, and can provide intuitive see-through guidance information. However, due to changes in intraoperative tissue, the preoperative tissue structure is not able to exactly correspond to reality, which influences the precision of in situ AR navigation. To solve this problem, we propose a method to update the tissue structure for in situ AR navigation in such way to reflect changes in intraoperative tissue.
View Article and Find Full Text PDFFabrication of a three-dimensional (3D) device with volume-filling autostereoscopic imagery provides a unique solution to the accommodation-convergence mismatch problem in a conventional stereoscopic 3D display. We demonstrate a volumetric 3D display consisting of a stack of sequentially-driven transparent cholesteric films that illuminate every point in the display volume to generate a synthetic 3D image. Transparent cholesteric films comprise of the reverse-mode polymer-stabilized cholesteric texture (R-PSCT) that exhibits > 85% transmittance in its off-state (Grandjean texture) and <15% transmittance in its on-state (focal-conic texture).
View Article and Find Full Text PDFMultiview glasses-free 3-D laparoscopy.
IEEE Trans Biomed Eng
October 2012
Department of Electrical and Computer Engineering, University of California, San Diego, CA 92093, USA.
Numerous attempts have been made to introduce three-dimensional (3-D) video systems into clinical routine, particularly for surgeries. The drawback with all of them thus far has been the fact that they require users to wear cumbersome glasses in order to receive the advantage of stereoscopy. In this study, we present, to our best knowledge, the world's very first laparoscopic surgical system that delivers glasses-free multiview 3-D in high-definition (HD) resolution.
View Article and Find Full Text PDFA rehabilitation tool for functional balance using altered gravity and virtual reality.
J Neuroeng Rehabil
July 2007
Sister Kenny Rehabilitation Institute, Sister Kenny Research Center (12101), 800 E, 28th St, Minneapolis, MN 55407, USA.
Background: There is a need for effective and early functional rehabilitation of patients with gait and balance problems including those with spinal cord injury, neurological diseases and recovering from hip fractures, a common consequence of falls especially in the elderly population. Gait training in these patients using partial body weight support (BWS) on a treadmill, a technique that involves unloading the subject through a harness, improves walking better than training with full weight bearing. One problem with this technique not commonly acknowledged is that the harness provides external support that essentially eliminates associated postural adjustments (APAs) required for independent gait.
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