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Cheol-Hwan Kim, Seon-Young Ryu, Ji-Young Yoon, Hyoung-Kwon Lee, Nak-Gu Choi, Il-Ho Park, Hae-Young Choi
BACKGROUND: The surgical microscope is used primarily for microsurgeries, which are more complicated than other surgical procedures and require delicate tasks for a long time. Therefore, during these surgical procedures, surgeons experience back and neck pain. To solve this problem, new technology, such as wearable displays, is required to help surgeons maintain comfortable postures and enjoy advanced functionality during microsurgery. OBJECTIVE: The objective of this study was to develop a surgical microscope system that would work with wearable devices...
March 7, 2019: JMIR MHealth and UHealth
Alex Blate, Mary Whitton, Montek Singh, Greg Welch, Andrei State, Turner Whitted, Henry Fuchs
This paper presents the implementation and evaluation of a 50,000-pose-sample-per-second, 6-degree-of-freedom optical head tracking instrument with motion-to-pose latency of [Formula: see text] and dynamic precision of 1-2 arcminutes. The instrument uses high-intensity infrared emitters and two duo-lateral photodiode-based optical sensors to triangulate pose. This instrument serves two purposes: it is the first step towards the requisite head tracking component in sub-[Formula: see text] motion-to-photon latency optical see-through augmented reality (OST AR) head-mounted display (HMD) systems; and it enables new avenues of research into human visual perception...
March 4, 2019: IEEE Transactions on Visualization and Computer Graphics
Hortensia Gimeno, Richard G Brown, Jean-Pierre Lin, Victoria Cornelius, Helene J Polatajko
OBJECTIVE: This proof-of-concept feasibility trial examined the potential of the Cognitive Orientation to daily Occupational Performance Approach (CO-OP) to augment deep brain stimulation (DBS) outcomes in childhood-onset hyperkinetic movement disorders (HMD) including dystonia and dyskinetic cerebral palsy. METHODS: This is a single case experimental design using multiple baseline as n-of-1 trial comprising 10 intervention sessions, with replications across participants (n = 10)...
February 22, 2019: Neurology
Zhiming Hu, Congyi Zhang, In-Kwon Li, Guoping Wang, Dinesh Manocha
We present a novel, data-driven eye-head coordination model that can be used for realtime gaze prediction for immersive HMD-based applications without any external hardware or eye tracker. Our model (SGaze) is computed by generating a large dataset that corresponds to different users navigating in virtual worlds with different lighting conditions. We perform statistical analysis on the recorded data and observe a linear correlation between gaze positions and head rotation angular velocities. We also find that there exists a latency between eye movements and head movements...
February 18, 2019: IEEE Transactions on Visualization and Computer Graphics
Masakazu Hirota, Hiroyuki Kanda, Takao Endo, Tomomitsu Miyoshi, Suguru Miyagawa, Yoko Hirohara, Tatsuo Yamaguchi, Makoto Saika, Takeshi Morimoto, Takashi Fujikado
This study aimed to evaluate objective and subjective visual fatigue experienced before and after performing a visual task, while using a head-mounted display for virtual reality (VR-HMD) and two-dimensional (2D) display. Binocular fusion maintenance (BFM) was measured using a binocular open-view Shack-Hartmann wavefront aberrometer equipped with liquid crystal shutters. Twelve healthy subjects performed the BFM test and completed a questionnaire regarding subjective symptoms before and after performing a visual task that induces low visually induced motion sickness (VIMS)...
February 18, 2019: Ergonomics
Lili Wang, Jian Wu, Xuefeng Yang, Voicu Popescu
Virtual Reality (VR) applications allow a user to explore a scene intuitively through a tracked head-mounted display (HMD). However, in complex scenes, occlusions make scene exploration inefficient, as the user has to navigate around occluders to gain line of sight to potential regions of interest. When a scene region proves to be of no interest, the user has to retrace their path, and such a sequential scene exploration implies significant amounts of wasted navigation. Furthermore, as the virtual world is typically much larger than the tracked physical space hosting the VR application, the intuitive one-to-one mapping between the virtual and real space has to be temporarily suspended for the user to teleport or redirect in order to conform to the physical space constraints...
February 14, 2019: IEEE Transactions on Visualization and Computer Graphics
Seyedkoosha Mirhosseini, Ievgeniia Gutenko, Sushant Ojal, Joseph Marino, Arie Kaufman
Virtual colonoscopy (VC) is a non-invasive screening tool for colorectal polyps which employs volume visualization of a colon model reconstructed from a CT scan of the patient's abdomen. We present an immersive analytics system for VC which enhances and improves the traditional desktop VC through the use of VR technologies. Our system, using a head-mounted display (HMD), includes all of the standard VC features, such as the volume rendered endoluminal fly-through, measurement tool, bookmark modes, electronic biopsy, and slice views...
February 14, 2019: IEEE Transactions on Visualization and Computer Graphics
Naoufal Elghoul, Youssef Jalal, Ayoub Bouya, Ali Zine, Abdeloihab Jaafar
Introduction: Pure isolated dislocations of the fifth carpometacarpal joint are extremely rare. To the best of our knowledge, the case, we present here, is among the extremely rare cases report of an unstable hamatometacarpal dislocation(HMD)injury successfully treated by a well-molded cast. Case Report: A 30-year-old rider fell from his horse, causing swelling of the wrist and the fifth finger was rotated with minimal active motion. The radiological assessment (X-rays and tomography) showed a pure HMD...
September 2018: Journal of Orthopaedic Case Reports
Ping-Yen Chou, Jui-Yi Wu, Shang-Hao Huang, Chun-Ping Wang, Zong Qin, Cheng-Ting Huang, Po-Yuan Hsieh, Hsin-Hseuh Lee, Ting-Hsuan Lin, Yi-Pai Huang
In recent years, head-mounted display technologies have greatly advanced. In order to overcome the accommodation-convergence conflict, light field displays reconstruct three-dimensional (3D) images with a focusing cue but sacrifice resolution. In this paper, a hybrid head-mounted display system that is based on a liquid crystal microlens array is proposed. By using a time-multiplexed method, the display signals can be divided into light field and two-dimensional (2D) modes to show comfortable 3D images with high resolution compensated by the 2D image...
January 21, 2019: Optics Express
Jyotirmaya Behera, Suresh C Tyagi, Neetu Tyagi
Bone marrow (BM)-derived endothelial progenitor cells (EPCs) are the key players in angiogenesis and vascular function. Cystathionine-β-synthase (CBS), an H2 S-generating enzyme in methionine metabolism, regulates the function of these EPCs. This study aims to examine whether CBS hyper-methylation contributes to the bone marrow endothelial progenitor cell (BM-EPCs) function and subsequent bone blood flow in mice fed with a high methionine diet (HMD). Bone marrow (BM) cells were collected from HMD and control mice, differentiated into BM-EPCs, and were characterized by acLDL-DiI labeling...
January 22, 2019: Biochemical and Biophysical Research Communications
Guanhua Li, Li Zhang, Yunxia Sun, Jimei Chen, Chengbin Zhou
RATIONALE: Extracorporeal membrane oxygenation (ECMO) is a well-known technique to provide cardio-pulmonary support. Although continuous renal replacement therapy (CRRT) is frequently indicated, the need for faster fluid removal as the primary indication for ECMO is uncommon. Experiences on concomitant applications of ECMO, peritoneal dialysis (PD) and CRRT in neonates are relatively limited. PATIENT CONCERNS: We report a 2-day-old male neonate with life-threatening hyaline membrane disease (HMD), accompained by severe systemic fluid retention, sepsis and abdominal compartment syndrome...
January 2019: Medicine (Baltimore)
Rebecca M Foerster, Christian H Poth, Christian Behler, Mario Botsch, Werner X Schneider
OBJECTIVE: Neuropsychological patients often suffer from impairments in visual selective attention and processing capacity components. Their assessment demands a high standardization of testing conditions, which is difficult to achieve across institutions. Head-mounted displays (HMDs) provide a solution. These virtual reality devices cover the entire visual field in a shielded way and thus keep visual stimulation constant. For neuropsychological assessment with HMDs, sufficient reliability is required...
January 17, 2019: Neuropsychology
Maurizio Vertemati, Simone Cassin, Francesco Rizzetto, Angelo Vanzulli, Marco Elli, Gianluca Sampogna, Maurizio Gallieni
INTRODUCTION: With the availability of low-cost head-mounted displays (HMDs), virtual reality environments (VREs) are increasingly being used in medicine for teaching and clinical purposes. Our aim was to develop an interactive, user-friendly VRE for tridimensional visualization of patient-specific organs, establishing a workflow to transfer 3-dimensional (3D) models from imaging datasets to our immersive VRE. MATERIALS AND METHODS: This original VRE model was built using open-source software and a mobile HMD, Samsung Gear VR...
January 11, 2019: Surgical Innovation
Tomohiro Watanabe, Tristan Wagner, Gangfeng Huang, Jörg Kahnt, Kenichi Ataka, Ulrich Ermler, Seigo Shima
[Fe]-hydrogenase (Hmd) catalyzes the reversible hydrogenation of methenyl-tetrahydromethanopterin (methenyl-H4MPT+) with H2. H4MPT is a C1-carrier of methanogenic archaea. One bacterial genus, Desulfurobacterium, contains putative genes for the Hmd paralog (HmdII) and the HcgA-G proteins. The latter are involved in biosynthesis of the prosthetic group of Hmd, the iron-guanylylpyridinol (FeGP) cofactor. This finding is intriguing because Hmd and HmdII strictly use H4MPT derivatives that are absent in most bacteria...
January 2, 2019: Angewandte Chemie
Zhimei Huang, Haipeng Zeng, Meilan Xie, Xing Lin, Zhaoming Huang, Yue Shen, Yunhui Huang
Ether-based electrolytes are commonly used in Li-O2 batteries (LOBs) because of their relatively high stability. But they are still prone to be attacked by superoxides or singlet oxygen via hydrogen abstract reactions, which leads to performance decaying during long-term operation. In this study, we propose a methylated cyclic ether, 2,2,4,4,5,5-hexamethyl-1,3-dioxolane (HMD), as a stable electrolyte solvent for LOBs. Such compound doesn't contain any hydrogen atom on the alpha-carbon of the ether, and thus avoids the hydrogen abstraction reactions...
December 27, 2018: Angewandte Chemie
Veronica Chu, Michael D'Zmura
Feature-based attention (FBA) helps one detect objects with a particular color, motion, or orientation. FBA works globally; the attended feature is enhanced at all positions in the visual field. This global property of FBA lets one use stimuli presented in the peripheral visual field to track attention in a task presented centrally. The present study explores the use of SSVEPs, generated by flicker presented peripherally, to track attention in a visual search task presented centrally. We evaluate whether this use of EEG to track FBA is robust enough to track attention when performing visual search within a dynamic 3D environment presented with a head-mounted display (HMD)...
October 31, 2018: Journal of Neural Engineering
Danilo Avola, Luigi Cinque, Gian Luca Foresti, Marco Raoul Marini
Strokes, surgeries, or degenerative diseases can impair motor abilities and balance. Long-term rehabilitation is often the only way to recover, as completely as possible, these lost skills. To be effective, this type of rehabilitation should follow three main rules. First, rehabilitation exercises should be able to keep patient's motivation high. Second, each exercise should be customizable depending on patient's needs. Third, patient's performance should be evaluated objectively, i.e., by measuring patient's movements with respect to an optimal reference model...
December 3, 2018: Journal of Biomedical Informatics
Taichi Ishiguro, Yoshikazu Okada, Tatsuya Ishikawa, Koji Yamaguchi, Akitsugu Kawashima, Takakazu Kawamata
The effects of superficial temporal artery to middle cerebral artery (STA-MCA) double bypass on recurrent hemorrhage in the operated hemisphere in hemorrhagic moyamoya disease (HMD) have not been clearly demonstrated. This study evaluated the effectiveness of STA-MCA double bypass in the prevention of further hemorrhagic or ischemic events in the operated hemispheric sides in comparison to the conservatively treated non-operated sides. We retrospectively analyzed 52 hemispheres of 36 patients with adult-onset HMD treated with STA-MCA double bypass...
December 3, 2018: Neurosurgical Review
S Moosburner, C Remde, P Tang, M Queisner, N Haep, J Pratschke, I M Sauer
BACKGROUND: Recent developments in the field of augmented reality (AR) have enabled new use cases in surgery. Initial set-up of an appropriate infrastructure for maintaining an AR surgical workflow requires investment in appropriate hardware. METHODS: We compared the usability of the Microsoft HoloLens and Meta 2 head mounted displays (HMDs). Fifteen medicine students tested each device and were questioned with a variant of the System Usability Scale (SUS). Two surgeons independently tested the devices in an intraoperative setting...
November 28, 2018: Artificial Organs
Ehsan Azimi, Alexander Winkler, Emerson Tucker, Long Qian, Jayfus Doswell, Nassir Navab, Peter Kazanzides
One cause of preventable death is a lack of proper skills for providing critical care. The conventional course taught to non-medical individuals involves instructions of advanced emergency procedures routinely limited to a verbal block of instructions in a standardized presentation (for example, an instructional video).In the present study, we evaluate the benefits of using an OST-HMD for training of caregivers in an emergency medical environment. A rich user interface was implemented that provides 3D visual aids including images, text and tracked 3D overlays corresponding to each task that needs to be performed...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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