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https://www.readbyqxmd.com/read/29029596/additional-visualization-via-smart-glasses-improves-accuracy-of-wire-insertion-in-fracture-surgery
#1
Masanori Tsubosaka, Takafumi Hiranaka, Kenjiro Okimura, Yuta Nakanishi, Yosaku Shibata, Yuichi Hida, Takaaki Fujishiro, Harunobu Uemoto
BACKGROUND: Smart glasses (SG) are a wearable device consisting of a small computer built into a head-mounted monitor (HMM) that can display various kinds of information. Lateral side visualization is displayed on the HMM of SG so the operator may also see it and the anteroposterior (AP) direction simultaneously. The present pilot study aimed to investigate the usefulness of SG in wire insertion for bone fracture. METHODS: We marked both the front and lateral sides of the shaft of an artificial femur bone...
October 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28991916/the-essential-role-of-optical-flow-in-the-peripheral-visual-field-for-stable-quiet-standing-evidence-from-the-use-of-a-head-mounted-display
#2
Kentaro Horiuchi, Masami Ishihara, Kuniyasu Imanaka
It has long been thought that vision is the most essential factor in maintaining stable quiet standing compared to other sources (i.e., vestibular and somatosensory inputs) of information. Specifically, several vision studies on postural control have shown evidence for the importance of the visual system, particularly peripheral vision rather than central vision, and optical flow. Nevertheless, to date, no study has manipulated both visual field and optical flow concurrently. In the present study, we experimentally manipulated both the visual field (the central and peripheral visual fields) and the occurrence of optical flow during quiet standing, examining the effects of the visual field and optical flow on postural sway measured in terms of the center of pressure (CoP)...
2017: PloS One
https://www.readbyqxmd.com/read/28986411/virtual-reality-improves-embodiment-and-neuropathic-pain-caused-by-spinal-cord-injury
#3
Polona Pozeg, Estelle Palluel, Roberta Ronchi, Marco Solcà, Abdul-Wahab Al-Khodairy, Xavier Jordan, Ammar Kassouha, Olaf Blanke
OBJECTIVE: To investigate changes in body ownership and chronic neuropathic pain in patients with spinal cord injury (SCI) using multisensory own body illusions and virtual reality (VR). METHODS: Twenty patients with SCI with paraplegia and 20 healthy control participants (HC) participated in 2 factorial, randomized, repeated-measures design studies. In the virtual leg illusion (VLI), we applied asynchronous or synchronous visuotactile stimulation to the participant's back (either immediately above the lesion level or at the shoulder) and to the virtual legs as seen on a VR head-mounted display...
October 6, 2017: Neurology
https://www.readbyqxmd.com/read/28961115/a-survey-of-calibration-methods-for-optical-see-through-head-mounted-displays
#4
Jens Grubert, Yuta Itoh, Kenneth R Moser, J Edward Swan Ii
Optical see-through head-mounted displays (OST HMDs) are a major output medium for Augmented Reality, which have seen significant growth in popularity and usage among the general public due to the growing release of consumer-oriented models, such as the Microsoft Hololens. Unlike Virtual Reality headsets, OST HMDs inherently support the addition of computer-generated graphics directly into the light path between a user's eyes and their view of the physical world. As with most Augmented and Virtual Reality systems, the physical position of an OST HMD is typically determined by an external or embedded 6-Degree-of-Freedom tracking system...
September 28, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28883717/assessing-balance-through-the-use-of-a-low-cost-head-mounted-display-in-older-adults-a-pilot-study
#5
Santiago J Saldana, Anthony P Marsh, W Jack Rejeski, Jack K Haberl, Peggy Wu, Scott Rosenthal, Edward H Ip
INTRODUCTION: As the population ages, the prevention of falls is an increasingly important public health problem. Balance assessment forms an important component of fall-prevention programs for older adults. The recent development of cost-effective and highly responsive virtual reality (VR) systems means new methods of balance assessment are feasible in a clinical setting. This proof-of-concept study made use of the submillimeter tracking built into modern VR head-mounted displays (VRHMDs) to assess balance through the use of visual-vestibular conflict...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28866590/the-hologram-in-my-hand-how-effective-is-interactive-exploration-of-3d-visualizations-in-immersive-tangible-augmented-reality
#6
Benjamin Bach, Ronell Sicat, Johanna Beyer, Maxime Cordeil, Hanspeter Pfister
We report on a controlled user study comparing three visualization environments for common 3D exploration. Our environments differ in how they exploit natural human perception and interaction capabilities. We compare an augmented-reality head-mounted display (Microsoft HoloLens), a handheld tablet, and a desktop setup. The novel head-mounted HoloLens display projects stereoscopic images of virtual content into a user's real world and allows for interaction in-situ at the spatial position of the 3D hologram...
August 29, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28859092/seeing-virtual-while-acting-real-visual-display-and-strategy-effects-on-the-time-and-precision-of-eye-hand-coordination
#7
Anil U Batmaz, Michel de Mathelin, Birgitta Dresp-Langley
Effects of different visual displays on the time and precision of bare-handed or tool-mediated eye-hand coordination were investigated in a pick-and-place-task with complete novices. All of them scored well above average in spatial perspective taking ability and performed the task with their dominant hand. Two groups of novices, four men and four women in each group, had to place a small object in a precise order on the centre of five targets on a Real-world Action Field (RAF), as swiftly as possible and as precisely as possible, using a tool or not (control)...
2017: PloS One
https://www.readbyqxmd.com/read/28829317/multimodal-evaluation-of-the-differences-between-real-and-virtual-assemblies
#8
Mikel Sagardia, Thomas Hulin
What are the technological bottlenecks in virtual assembly simulations with haptic feedback? To tackle this question, we present an evaluation study in which real feedback modalities are gradually replaced by synthetic ones. In particular, the effects of the following factors on the user performance and perception during virtual assemblies are analyzed: (i) a visual feedback system consisting of an nVisor head-mounted display, (ii) our haptic device HUG suited for unscaled upper-body movements, and (iii) our novel six-DoF constraint-based haptic rendering algorithm...
August 18, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28816519/the-effects-of-exercise-on-a-choice-reaction-time-task-in-individuals-with-post-concussion-syndrome
#9
Stephanie A Ramautar, Alyssa A Prangley, Michael E Cinelli
PURPOSE: To assess cognitive performance differences pre- and post-exercise in individuals without concussion (non-concussed, NC) and individuals with post-concussion syndrome (PCS). METHODS: A total of 30 participants completed a choice reaction time (CRT) task in the form of an iPad application, measuring each individual's decision-making capabilities, while wearing a head-mounted eye tracker system. Participants completed four blocks of testing; the time interval between the first two blocks of trials and the last two blocks of trials was 10 minutes...
August 17, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28813567/comparison-of-view-based-and-reconstruction-based-models-of-human-navigational-strategy
#10
COMPARATIVE STUDY
Luise Gootjes-Dreesbach, Lyndsey C Pickup, Andrew W Fitzgibbon, Andrew Glennerster
There is good evidence that simple animals, such as bees, use view-based strategies to return to a familiar location, whereas humans might use a 3-D reconstruction to achieve the same goal. Assuming some noise in the storage and retrieval process, these two types of strategy give rise to different patterns of predicted errors in homing. We describe an experiment that can help distinguish between these models. Participants wore a head-mounted display to carry out a homing task in immersive virtual reality. They viewed three long, thin, vertical poles and had to remember where they were in relation to the poles before being transported (virtually) to a new location in the scene from where they had to walk back to the original location...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28809700/cognitive-cost-of-using-augmented-reality-displays
#11
James Baumeister, Seung Youb Ssin, Neven A M ElSayed, Jillian Dorrian, David P Webb, James A Walsh, Timothy M Simon, Andrew Irlitti, Ross T Smith, Mark Kohler, Bruce H Thomas
This paper presents the results of two cognitive load studies comparing three augmented reality display technologies: spatial augmented reality, the optical see-through Microsoft HoloLens, and the video see-through Samsung Gear VR. In particular, the two experiments focused on isolating the cognitive load cost of receiving instructions for a button-pressing procedural task. The studies employed a self-assessment cognitive load methodology, as well as an additional dual-task cognitive load methodology. The results showed that spatial augmented reality led to increased performance and reduced cognitive load...
August 10, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28809690/occlusion-leak-compensation-for-optical-see-through-displays-using-a-single-layer-transmissive-spatial-light-modulator
#12
Yuta Itoh, Takumi Hamasaki, Maki Sugimoto
We propose an occlusion compensation method for optical see-through head-mounted displays (OST-HMDs) equipped with a singlelayer transmissive spatial light modulator (SLM), in particular, a liquid crystal display (LCD). Occlusion is an important depth cue for 3D perception, yet realizing it on OST-HMDs is particularly difficult due to the displays' semitransparent nature. A key component for the occlusion support is the SLM-a device that can selectively interfere with light rays passing through it. For example, an LCD is a transmissive SLM that can block or pass incoming light rays by turning pixels black or transparent...
August 10, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28809183/helping-hands-using-augmented-reality-to-provide-remote-guidance-to-health-professionals
#13
Carey Mather, Tony Barnett, Vlasti Broucek, Annette Saunders, Darren Grattidge, Weidong Huang
Access to expert practitioners or geographic distance can compound the capacity for appropriate supervision of health professionals in the workplace. Guidance and support of clinicians and students to undertake new or infrequent procedures can be resource intensive. The Helping Hands remote augmented reality system is an innovation to support the development of, and oversee the acquisition of procedural skills through remote learning and teaching supervision while in clinical practice. Helping Hands is a wearable, portable, hands-free, low cost system comprised of two networked laptops, a head-mounted display worn by the recipient and a display screen used remotely by the instructor...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28804731/eye-tracking-in-catheter-based-cardiovascular-interventions-early-results
#14
Peter Lanzer, Mohammad Al-Naser, Syed Saqib Bukhari, Andreas Dengel, Elizabeth A Krupinski
Visual x-ray image processing (XRIP) represents a fundamental component of catheter-based cardiovascular interventions (CBCVIs). To date, no data are available to define XRIP in this setting. To characterize CBCVI XRIP, we developed a computer-based method allowing continuous temporal-spatial analysis of data recorded by a head-mounted eye-tracking device. Quantitative analysis of gaze duration of an expert operator (EO) revealed that the average time in minutes spent viewing the images on the display screen was [Formula: see text] and [Formula: see text] of the total recorded time in coronary angiography (CA) and in CA followed by CBCVI, respectively...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28759983/validation-of-ct-image-based-software-for-three-dimensional-measurement-of-acetabular-coverage-profile
#15
Marcus P Wenzl, Markus Heller, Viktor Janz, Carsten Perka, Georgi I Wassilew
BACKGROUND: Plain radiography, 2-dimensional (2D) magnetic resonance imaging (MRI), and computed tomography (CT) do not precisely display morphology and acetabular coverage in developmental dysplasia of the hip or pincer-type femoroacetabular impingement. Pelvic position and pelvic tilt affect assessment of the acetabular parameters, leading to misinterpretation. OBJECTIVE: We tested a 3-dimensional (3D) CT evaluation script to calculate the crossover sign (COS), acetabular coverage and morphology...
July 21, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/28754068/a-new-head-mounted-display-based-augmented-reality-system-in-neurosurgical-oncology-a-study-on-phantom
#16
Fabrizio Cutolo, Antonio Meola, Marina Carbone, Sara Sinceri, Federico Cagnazzo, Ennio Denaro, Nicola Esposito, Mauro Ferrari, Vincenzo Ferrari
PURPOSE: Benefits of minimally invasive neurosurgery mandate the development of ergonomic paradigms for neuronavigation. Augmented Reality (AR) systems can overcome the shortcomings of commercial neuronavigators. The aim of this work is to apply a novel AR system, based on a head-mounted stereoscopic video see-through display, as an aid in complex neurological lesion targeting. Effectiveness was investigated on a newly designed patient-specific head mannequin featuring an anatomically realistic brain phantom with embedded synthetically created tumors and eloquent areas...
December 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/28751536/defective-sperm-head-decondensation-undermines-the-success-of-icsi-in-the-bovine
#17
Luis Águila, Ricardo Felmer, María Elena Arias, Felipe Navarrete, David Martin-Hidalgo, Hoi Chang Lee, Pablo Visconti, Rafael Fissore
The efficiency of intracytoplasmic sperm injection (ICSI) in the bovine is low compared to other species. It is unknown whether defective oocyte activation and/or sperm head decondensation limit the success of this technique in this species. To elucidate where the main obstacle lies, we used homologous and heterologous ICSI and parthenogenetic activation procedures. We also evaluated whether in vitro maturation negatively impacted the early stages of activation after ICSI. Here we showed that injected bovine sperm are resistant to nuclear decondensation by bovine oocytes and this is only partly overcome by exogenous activation...
September 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28751302/smartphone-based-endoscope-system-for-advanced-point-of-care-diagnostics-feasibility-study
#18
Jung Kweon Bae, Andrey Vavilin, Joon S You, Hyeongeun Kim, Seon Young Ryu, Jeong Hun Jang, Woonggyu Jung
BACKGROUND: Endoscopic technique is often applied for the diagnosis of diseases affecting internal organs and image-guidance of surgical procedures. Although the endoscope has become an indispensable tool in the clinic, its utility has been limited to medical offices or operating rooms because of the large size of its ancillary devices. In addition, the basic design and imaging capability of the system have remained relatively unchanged for decades. OBJECTIVE: The objective of this study was to develop a smartphone-based endoscope system capable of advanced endoscopic functionalities in a compact size and at an affordable cost and to demonstrate its feasibility of point-of-care through human subject imaging...
July 27, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28719062/immersive-virtual-reality-as-a-teaching-tool-for-neuroanatomy
#19
Katelyn Stepan, Joshua Zeiger, Stephanie Hanchuk, Anthony Del Signore, Raj Shrivastava, Satish Govindaraj, Alfred Iloreta
BACKGROUND: Three-dimensional (3D) computer modeling and interactive virtual reality (VR) simulation are validated teaching techniques used throughout medical disciplines. Little objective data exists supporting its use in teaching clinical anatomy. Learner motivation is thought to limit the rate of utilization of such novel technologies. The purpose of this study is to evaluate the effectiveness, satisfaction, and motivation associated with immersive VR simulation in teaching medical students neuroanatomy...
October 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28701101/validation-of-an-immersive-virtual-reality-system-for-training-near-and-far-space-neglect-in-individuals-with-stroke-a-pilot-study
#20
Kazuhiro Yasuda, Daisuke Muroi, Masahiro Ohira, Hiroyasu Iwata
BACKGROUND: Unilateral spatial neglect (USN) is defined as impaired ability to attend and see on one side, and when present, it interferes seriously with daily life. These symptoms can exist for near and far spaces combined or independently, and it is important to provide effective intervention for near and far space neglect. OBJECTIVE: The purpose of this pilot study was to propose an immersive virtual reality (VR) rehabilitation program using a head-mounted display that is able to train both near and far space neglect, and to validate the immediate effect of the VR program in both near and far space neglect...
July 12, 2017: Topics in Stroke Rehabilitation
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