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https://www.readbyqxmd.com/read/29140355/enhancing-the-resolution-of-a-near-eye-display-with-a-pancharatnam-berry-phase-deflector
#1
Yun-Han Lee, Tao Zhan, Shin-Tson Wu
We report an electro-optic image shifter to enhance the resolution of display devices with a Pancharatnam-Berry phase deflector (PBD). The switching time of our PBD is less than 1 ms. Through synchronizing and computational factorization, we are able to double the display resolution for reducing the screen door effect. Such a thin and lightweight PBD image shifter can be easily integrated into wearable display devices. Its potential application for virtual reality and augmented reality is emphasized.
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29137725/a-gait-retraining-system-using-augmented-reality-to-modify-footprint-parameters-effects-on-lower-limb-sagittal-plane-kinematics
#2
Sami Bennour, Baptiste Ulrich, Thomas Legrand, Brigitte M Jolles, Julien Favre
Improving lower-limb flexion/extension angles during walking is important for the treatment of numerous pathologies. Currently, these gait retraining procedures are mostly qualitative, often based on visual assessment and oral instructions. This study aimed to propose an alternative method combining motion capture and display of target footprints on the floor. The second objectives were to determine the error in footprint modifications and the effects of footprint modifications on lower-limb flexion/extension angles...
November 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29122571/360%C3%A2-operative-videos-a-randomised-cross-over-study-evaluating-attentiveness-and-information-retention
#3
Cuan M Harrington, Dara O Kavanagh, Gemma Wright Ballester, Athena Wright Ballester, Patrick Dicker, Oscar Traynor, Arnold Hill, Sean Tierney
OBJECTIVE: Although two-dimensional (2D) and three-dimensional videos have traditionally provided foundations for reviewing operative procedures, the recent 360º format may provide new dimensions to surgical education. This study sought to describe the production of a high quality 360º video for an index-operation (augmented with educational material), while evaluating for variances in attentiveness, information retention, and appraisal compared to 2D. DESIGN: A 6-camera synchronised array (GoPro Omni, [California, United States]) was suspended inverted and recorded an elective laparoscopic cholecystectomy in 2016...
November 6, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/29115184/evaluation-of-augmented-reality-feedback-in-surgical-training-environment
#4
Mohsen Zahiri, Carl A Nelson, Dmitry Oleynikov, Ka-Chun Siu
Providing computer-based laparoscopic surgical training has several advantages that enhance the training process. Self-evaluation and real-time performance feedback are 2 of these advantages, which avoid dependency of trainees on expert feedback. The goal of this study was to investigate the use of a visual time indicator as real-time feedback correlated with the laparoscopic surgical training. Twenty novices participated in this study working with (and without) different presentations of time indicators. They performed a standard peg transfer task, and their completion times and muscle activity were recorded and compared...
November 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/29114212/tablet-based-functional-mri-of-the-trail-making-test-effect-of-tablet-interaction-mode
#5
Mahta Karimpoor, Nathan W Churchill, Fred Tam, Corinne E Fischer, Tom A Schweizer, Simon J Graham
The Trail Making Test (TMT) is widely used for assessing executive function, frontal lobe abilities, and visual motor skills. Part A of this pen-and-paper test (TMT-A) involves linking numbers randomly distributed in space, in ascending order. Part B (TMT-B) alternates between linking numbers and letters. TMT-B is more demanding than TMT-A, but the mental processing that supports the performance of this test remains incompletely understood. Functional MRI (fMRI) may help to clarify the relationship between TMT performance and brain activity, but providing an environment that supports real-world pen-and-paper interactions during fMRI is challenging...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29112143/adaptive-monocular-visual-inertial-slam-for-real-time-augmented-reality-applications-in-mobile-devices
#6
Jin-Chun Piao, Shin-Dug Kim
Simultaneous localization and mapping (SLAM) is emerging as a prominent issue in computer vision and next-generation core technology for robots, autonomous navigation and augmented reality. In augmented reality applications, fast camera pose estimation and true scale are important. In this paper, we present an adaptive monocular visual-inertial SLAM method for real-time augmented reality applications in mobile devices. First, the SLAM system is implemented based on the visual-inertial odometry method that combines data from a mobile device camera and inertial measurement unit sensor...
November 7, 2017: Sensors
https://www.readbyqxmd.com/read/29104028/effectiveness-of-immersive-virtual-reality-in-surgical-training-a-randomized-control-trial
#7
Yeshwanth Pulijala, Minhua Ma, Matthew Pears, David Peebles, Ashraf Ayoub
PURPOSE: Surgical training methods are evolving with the technological advancements, including the application of virtual reality (VR) and augmented reality. However, 28 to 40% of novice residents are not confident in performing a major surgical procedure. VR surgery, an immersive VR (iVR) experience, was developed using Oculus Rift and Leap Motion devices (Leap Motion, Inc, San Francisco, CA) to address this challenge. Our iVR is a multisensory, holistic surgical training application that demonstrates a maxillofacial surgical technique, the Le Fort I osteotomy...
October 13, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29099249/effect-of-simulator-orientation-during-skills-training-on-performance-of-basic-laparoscopic-tasks-by-veterinary-students
#8
Rachael D Lencioni, Claude A Ragle, Mathew L Kinser, Todd Coffey, Boel A Fransson
OBJECTIVE To determine whether basic laparoscopic skills acquired during training in the horizontal plane would transfer to the vertical plane and vice versa. DESIGN Evaluation study. SAMPLE POPULATION 26 first- and second-year veterinary students with no prior laparoscopic skills training or surgical experience. PROCEDURES Participants were nonrandomly assigned to 2 groups. Group 1 (n = 15) underwent laparoscopic skills training in the horizontal plane, and group 2 (17) underwent laparoscopic skills training in the vertical plane...
November 15, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/29096179/performance-of-a-visuomotor-walking-task-in-an-augmented-reality-training-setting
#9
Juliet A M Haarman, Julia T Choi, Jaap H Buurke, Johan S Rietman, Jasper Reenalda
Visual cues can be used to train walking patterns. Here, we studied the performance and learning capacities of healthy subjects executing a high-precision visuomotor walking task, in an augmented reality training set-up. A beamer was used to project visual stepping targets on the walking surface of an instrumented treadmill. Two speeds were used to manipulate task difficulty. All participants (n = 20) had to change their step length to hit visual stepping targets with a specific part of their foot, while walking on a treadmill over seven consecutive training blocks, each block composed of 100 stepping targets...
October 27, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29092182/reflective-polarization-volume-gratings-for-high-efficiency-waveguide-coupling-augmented-reality-displays
#10
Yun-Han Lee, Kun Yin, Shin-Tson Wu
We demonstrate a reflective liquid-crystal polarization volume grating with high efficiency for augmented reality displays. The coupling efficiency was measured to be 90% at 650 nm and 50° deflection angle. The angular dependence of reflection band agrees well with Bragg condition, and the transmittance of environment light is high with negligible scattering. The bandwidth can be tailored by controlling the layer periodicity, allowing versatile applications and design freedom not only for augmented realities but also for other photonic devices...
October 30, 2017: Optics Express
https://www.readbyqxmd.com/read/29068947/discussion-mixed-reality-with-hololens-where-virtual-reality-meets-augmented-reality-in-the-operating-room
#11
COMMENT
Austin D Chen, Samuel J Lin
No abstract text is available yet for this article.
November 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29068946/mixed-reality-with-hololens-where-virtual-reality-meets-augmented-reality-in-the-operating-room
#12
Oren M Tepper, Hayeem L Rudy, Aaron Lefkowitz, Katie A Weimer, Shelby M Marks, Carrie S Stern, Evan S Garfein
Virtual reality and augmented reality devices have recently been described in the surgical literature. The authors have previously explored various iterations of these devices, and although they show promise, it has become clear that virtual reality and/or augmented reality devices alone do not adequately meet the demands of surgeons. The solution may lie in a hybrid technology known as mixed reality, which merges many virtual reality and augmented realty features. Microsoft's HoloLens, the first commercially available mixed reality device, provides surgeons intraoperative hands-free access to complex data, the real environment, and bidirectional communication...
November 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29068560/extremely-vivid-highly-transparent-and-ultrathin-quantum-dot-light-emitting-diodes
#13
Moon Kee Choi, Jiwoong Yang, Dong Chan Kim, Zhaohe Dai, Junhee Kim, Hyojin Seung, Vinayak S Kale, Sae Jin Sung, Chong Rae Park, Nanshu Lu, Taeghwan Hyeon, Dae-Hyeong Kim
Displaying information on transparent screens offers new opportunities in next-generation electronics, such as augmented reality devices, smart surgical glasses, and smart windows. Outstanding luminance and transparency are essential for such "see-through" displays to show vivid images over clear background view. Here transparent quantum dot light-emitting diodes (Tr-QLEDs) are reported with high brightness (bottom: ≈43 000 cd m(-2) , top: ≈30 000 cd m(-2) , total: ≈73 000 cd m(-2) at 9 V), excellent transmittance (90% at 550 nm, 84% over visible range), and an ultrathin form factor (≈2...
October 25, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29066423/examining-motivations-to-play-pok%C3%A3-mon-go-and-their-influence-on-perceived-outcomes-and-physical-activity
#14
Oriol Marquet, Claudia Alberico, Deepti Adlakha, J Aaron Hipp
BACKGROUND: Pokémon GO is the most played augmented reality game in history. With more than 44 million players at the peak of its popularity, the game has sparked interest on its effects on the young population's health. OBJECTIVE: This pilot study examined motivations to start playing Pokémon GO among a sample of US college students, and how motivations were associated with perceived outcomes of the playing experience and physical activity derived while playing...
October 24, 2017: JMIR Serious Games
https://www.readbyqxmd.com/read/29065604/recent-development-of-augmented-reality-in-surgery-a-review
#15
REVIEW
P Vávra, J Roman, P Zonča, P Ihnát, M Němec, J Kumar, N Habib, A El-Gendi
INTRODUCTION: The development augmented reality devices allow physicians to incorporate data visualization into diagnostic and treatment procedures to improve work efficiency, safety, and cost and to enhance surgical training. However, the awareness of possibilities of augmented reality is generally low. This review evaluates whether augmented reality can presently improve the results of surgical procedures. METHODS: We performed a review of available literature dating from 2010 to November 2016 by searching PubMed and Scopus using the terms "augmented reality" and "surgery...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29047803/light-efficient-augmented-reality-3d-display-using-highly-transparent-retro-reflective-screen
#16
Shoaib R Soomro, Hakan Urey
We propose and demonstrate a light-efficient 3D display using a highly transparent desktop-sized augmented reality screen. The display consists of a specially designed transparent retro-reflective screen and a pair of low-power pico-projectors positioned close to the viewer's eyes to provide stereo views. The transfer screen is an optically clear sheet partially patterned with retro-reflective microspheres for high optical gain. The retro-reflective material buried in the screen reflects incident light back towards the projectors with a narrow scattering angle and facilitates the viewer to perceive a very bright content...
August 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29042301/towards-a-first-implementation-of-the-wlimes-approach-in-living-system-studies-advancing-the-diagnostics-and-therapy-in-personalized-medicine
#17
Plamen L Simeonov
The goal of this paper is to advance an extensible theory of living systems using an approach to biomathematics and biocomputation that suitably addresses self-organized, self-referential and anticipatory systems with multi-temporal multi-agents. Our first step is to provide foundations for modelling of emergent and evolving dynamic multi-level organic complexes and their sustentative processes in artificial and natural life systems. Main applications are in life sciences, medicine, ecology and astrobiology, as well as robotics, industrial automation, man-machine interface and creative design...
October 16, 2017: Bio Systems
https://www.readbyqxmd.com/read/29041633/high-dynamic-range-head-mounted-display-based-on-dual-layer-spatial-modulation
#18
Miaomiao Xu, Hong Hua
The human visual system can perceive a much wider range of contrast than the addressable dynamic range afforded by the state-of-art head mounted displays (HMD). Increasing the dynamic range of HMDs becomes critical especially for augmented reality applications where the dynamic range of outdoor scenes can be as large as 14 orders of magnitude. In this paper, we present the integrated work of the design, implementation, calibration, and image-rendering algorithm of a high dynamic range HMD system. By using a pair of LCoS microdisplays as the spatial light modulators, accompanied with the relay optics to optically overlay the modulation layers, we demonstrate the reconstruction of high dynamic range images with high accuracy...
September 18, 2017: Optics Express
https://www.readbyqxmd.com/read/29040677/navigation-linked-heads-up-display-in-intracranial-surgery-early-experience
#19
Justin R Mascitelli, Leslie Schlachter, Alexander G Chartrain, Holly Oemke, Jeffrey Gilligan, Anthony B Costa, Raj K Shrivastava, Joshua B Bederson
BACKGROUND: The use of intraoperative navigation during microscope cases can be limited when attention needs to be divided between the operative field and the navigation screens. Heads-up display (HUD), also referred to as augmented reality, permits visualization of navigation information during surgery workflow. OBJECTIVE: To detail our initial experience with HUD. METHODS: We retrospectively reviewed patients who underwent HUD-assisted surgery from April 2016 through April 2017...
October 10, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29037757/testing-smart-glasses-in-urology-clinical-and-surgical-potential-applications
#20
E García-Cruz, A Bretonnet, A Alcaraz
OBJECTIVES: We aimed to explore the potential benefits of using smart glasses - wearable computer optical devices with touch-less command features - in the surgery room and in outpatient care settings in urology. MATERIALS AND METHODS: Between April and November 2015, 80 urologists were invited to use Google Glass in their daily surgical and clinical practice, and to share them with other urologists. Participants rated the usefulness of smart glasses on a 10-point scale, and provided insights on their potential benefits in a telephone interview...
October 13, 2017: Actas Urologicas Españolas
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