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https://www.readbyqxmd.com/read/28226790/the-effect-of-time-pressure-on-stress-levels-during-virtual-wheelchair-navigation
#1
Hachem A Lamti, Philippe Gorce, Hachem A Lamti, Philippe Gorce, Hachem A Lamti, Philippe Gorce
In this work stress is assessed based on EEG features. We focus our efforts on the correlation between subjective ratings and cerebral indices during virtual navigation scenarios. Ten male paraplegic subjects took part in the experiment and navigated in a virtual indoor environment. They had to fulfill two missions where time pressure parameter is introduced. Subjects were equipped with Electroencephalography sensors. Temporal and frequency data were filtered and extracted. A correlation study was conducted based on principal component analysis, Fisher's tests and ANOVA...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223487/selenium-deficiency-risk-predicted-to-increase-under-future-climate-change
#2
Gerrad D Jones, Boris Droz, Peter Greve, Pia Gottschalk, Deyan Poffet, Steve P McGrath, Sonia I Seneviratne, Pete Smith, Lenny H E Winkel
Deficiencies of micronutrients, including essential trace elements, affect up to 3 billion people worldwide. The dietary availability of trace elements is determined largely by their soil concentrations. Until now, the mechanisms governing soil concentrations have been evaluated in small-scale studies, which identify soil physicochemical properties as governing variables. However, global concentrations of trace elements and the factors controlling their distributions are virtually unknown. We used 33,241 soil data points to model recent (1980-1999) global distributions of Selenium (Se), an essential trace element that is required for humans...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28211003/an-easy-to-build-low-budget-point-of-care-ultrasound-simulator-from-linux-to-a-web-based-solution
#3
Domagoj Damjanovic, Ulrich Goebel, Benedikt Fischer, Martin Huth, Hartmut Breger, Hartmut Buerkle, Axel Schmutz
BACKGROUND: Hands-on training in point-of-care ultrasound (POC-US) should ideally comprise bedside teaching, as well as simulated clinical scenarios. High-fidelity phantoms and portable ultrasound simulation systems are commercially available, however, at considerable costs. This limits their suitability for medical schools. A Linux-based software for Emergency Department Ultrasound Simulation (edus2TM) was developed by Kulyk and Olszynski in 2011. Its feasibility for POC-US education has been well-documented, and shows good acceptance...
December 2017: Critical Ultrasound Journal
https://www.readbyqxmd.com/read/28208881/media-matter-the-effect-of-medium-of-presentation-on-student-s-recognition-of-histopathology
#4
Ajay Telang, Nynke De Jong, Jan Van Dalen
INTRODUCTION: Pathology teaching has undergone transformation with the introduction of virtual microscopy as a teaching and learning tool. AIM: To assess if dental students can identify histopathology irrespective of the media of presentation and if the media affect student's oral pathology case based learning scores. The perception of students towards "hybrid" approach in teaching and learning histopathology in oral pathology was also assessed. MATERIALS AND METHODS: A controlled experiment was conduc-ted on year 4 and year 5 dental student groups using a perfor-mance test and a questionnaire survey...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28198965/development-of-a-virtual-learning-environment-for-cardiorespiratory-arrest-training
#5
Anazilda Carvalho da Silva, Andrea Bernardes, Yolanda Dora Martinez Évora, Maria Célia Barcellos Dalri, Alexandre Ribeiro da Silva, Camila Santana Justo Cintra Sampaio
OBJECTIVE: To develop a Virtual Learning Environment (VLE) aiming at the training of nursing team workers and emergency vehicle drivers in Basic Life Support (BLS) to attend Cardiorespiratory arrest, and to evaluate the quality of its contents among specialists in the area of Emergency and Urgent care. METHOD: Applied research of technological development. The methodology used was based on the Instructional Design Model (ADDIE), which structures the teaching-learning planning in different stages (analysis, design, development, implementation and evaluation)...
November 2016: Revista da Escola de Enfermagem da U S P
https://www.readbyqxmd.com/read/28196288/clinical-adequacy-assessment-of-auto-contours-for-prostate-imrt-with-meaningful-endpoints
#6
Hamidreza Nourzadeh, William T Watkins, Mahmoud Ahmad, Cheukkai Hui, David Schlesinger, Jeffrey V Siebers
PURPOSE: To determine if radiation treatment plans created based on auto-segmented (AS) regions-of-interest (ROI)s are clinically equivalent to plans created based on manually segmented ROIs, where equivalence is evaluated using probabilistic dosimetric metrics and probabilistic biological endpoints for prostate IMRT. METHOD AND MATERIALS: Manually drawn contours and auto-segmented ROIs were created for 167 CT image sets acquired from 19 prostate patients. Auto-segmentation was performed utilizing Pinnacle's Smart Probabilistic Image Contouring Engine...
February 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/28191877/a-virtual-clinical-trial-comparing-static-versus-dynamic-pet-imaging-in-measuring-response-to-breast-cancer-therapy
#7
Kristen A Wangerin, Mark Muzi, Lanell Peterson, Hannah Linden, Alena Novakova, David Mankoff, Paul Kinahan
OBJECTIVE: We developed a method to evaluate variations in the PET imaging process in order to characterize the relative ability of static and dynamic metrics to measure breast cancer response to therapy in a clinical trial setting. METHODS: We performed a virtual clinical trial by generating 540 i.i.d. PET imaging study realizations for each of 22 original dynamic fluorodeoxyglucose (18F-FDG) breast cancer patient studies pre- and post-therapy. Each noise realization accounted for known sources of uncertainty in the imaging process, such as biological variability and SUV uptake time...
February 13, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28187414/web-based-hybrid-dimensional-visualization-and-exploration-of-cytological-localization-scenarios
#8
Gökhan Kovanci, Mehmood Ghaffar, Björn Sommer
The CELLmicrocosmos 4.2 PathwayIntegration (CmPI) is a tool which provides hybrid-dimensional visualization and analysis of intracellular protein and gene localizations in the context of a virtual 3D environment. This tool is developed based on Java/Java3D/JOGL and provides a standalone application compatible to all relevant operating systems. However, it requires Java and the local installation of the software. Here we present the prototype of an alternative web-based visualization approach, using Three.js and D3...
December 21, 2016: Journal of Integrative Bioinformatics
https://www.readbyqxmd.com/read/28178577/operative-and-diagnostic-hysteroscopy-a-novel-learning-model-combining-new-animal-models-and-virtual-reality-simulation
#9
Alfred Bassil, Chrystèle Rubod, Yves Borghesi, Yohan Kerbage, Elie Servan Schreiber, Henri Azaïs, Charles Garabedian
CONTEXT: Hysteroscopy is one of the most common gynaecological procedure. Training for diagnostic and operative hysteroscopy can be achieved through numerous previously described models like animal models or virtual reality simulation. We present our novel combined model associating virtual reality and bovine uteruses and bladders. STUDY DESIGN: End year residents in obstetrics and gynaecology attended a full day workshop. The workshop was divided in theoretical courses from senior surgeons and hands-on training in operative hysteroscopy and virtual reality Essure(®) procedures using the EssureSim™ and Pelvicsim™ simulators with multiple scenarios...
February 1, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28178361/a-natural-experiment-using-immersive-technologies-to-study-the-impact-of-all-natural-labeling-on-perceived-food-quality-nutritional-content-and-liking
#10
Rebecca Liu, Neal H Hooker, Efthimios Parasidis, Christopher T Simons
The "all-natural" label is used extensively in the United States. At many point-of-purchase locations, employed servers provide food samples and call out specific label information to influence consumers' purchase decisions. Despite these ubiquitous practices, it is unclear what information is conveyed to consumers by the all-natural label or how it impacts judgments of perceived food quality, nutritional content, and acceptance. We used a novel approach incorporating immersive technology to simulate a virtual in-store sampling scenario where consumers were asked by a server to evaluate identical products with only one being labeled all-natural...
February 8, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28167376/identifying-elder-abuse-neglect-among-family-caregiving-dyads-a-cross-sectional-study-of-psychometric-properties-of-the-qualcare-scale
#11
Carolyn E Z Pickering, Kimberly Ridenour, Zachary Salaysay, David Reyes-Gastelum, Steven J Pierce
BACKGROUND/OBJECTIVES: Universal screening for elder abuse and neglect is a current controversy in geriatrics, fueled by the lack of evidence on valid and reliable instruments. Since each U.S. State and many other countries have their own legal definitions of what constitutes elder abuse and neglect, this further complicates instrument development and clinical assessment. The purpose of this paper is to present data on the sensitivity and specificity of the QualCare Scale, an instrument with utility in detecting clinically significant elder abuse and neglect among older adults receiving care at home...
January 30, 2017: International Journal of Nursing Studies
https://www.readbyqxmd.com/read/28146451/training-effectiveness-of-a-wide-area-virtual-environment-in-medical-simulation
#12
Grady S Wier, Rebekah Tree, Rasha Nusr
INTRODUCTION: The success of war fighters and medical personnel handling traumatic injuries largely depends on the quality of training they receive before deployment. The purpose of this study was to gauge the utility of a Wide Area Virtual Environment (WAVE) as a training adjunct by comparing and evaluating student performance, measuring sense of realism, and assessing the impact on student satisfaction with their training exposure in an immersive versus a field environment. METHODS: This comparative prospective cohort study examined the utility of a three-screen WAVE where subjects were immersed in the training environment with medical simulators...
February 2017: Simulation in Healthcare: Journal of the Society for Simulation in Healthcare
https://www.readbyqxmd.com/read/28129173/bending-the-curve-sensitivity-to-bending-of-curved-paths
#13
Eike Langbehn, Paul Lubos, Gerd Bruder, Frank Steinicke
Redirected walking (RDW) promises to allow near-natural walking in an infinitely large virtual environment (VE) by subtle manipulations of the virtual camera. Previous experiments analyzed the human sensitivity to RDW manipulations by focusing on the worst-case scenario, in which users walk perfectly straight ahead in the VE, whereas they are redirected on a circular path in the real world. The results showed that a physical radius of at least 22 meters is required for undetectable RDW. However, users do not always walk exactly straight in a VE...
January 25, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28129171/a-psychophysical-experiment-regarding-components-of-the
#14
Richard Skarbez, Solene Neyret, Frederick P Brooks, Mel Slater, Mary C Whitton
We report on the design and results of an experiment investigating factors influencing Slater's Plausibility Illusion (Psi) in virtual environments (VEs). Slater proposed Psi and Place Illusion (PI) as orthogonal components of virtual experience which contribute to realistic response in a VE. PI corresponds to the traditional conception of presence as "being there," so there exists a substantial body of previous research relating to PI, but very little relating to Psi. We developed this experiment to investigate the components of plausibility illusion using subjective matching techniques similar to those used in color science...
January 25, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28113859/real-time-eye-writing-recognition-using-electrooculogram-eog
#15
Kwang-Ryeol Lee, Won-Du Chang, Sungkean Kim, Chang-Hwan Im
Eye movements can be used as alternative inputs for human-computer interface (HCI) systems such as virtual or augmented reality systems as well as new communication ways for patients with locked-in syndrome. In this study, we developed a real-time electrooculogram (EOG)-based eye-writing recognition system, with which users can write predefined symbolic patterns with their volitional eye movements. For the 'eye-writing' recognition, the proposed system first reconstructs the eye-written traces from EOG waveforms in real-time; then, the system recognizes the intended symbolic inputs with a reliable recognition rate by matching the input traces with the trained eye-written traces of diverse input patterns...
March 15, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28113746/fast-realistic-mri-simulations-based-on-generalized-multi-pool-exchange-tissue-model
#16
Fang Liu, Julia V Velikina, Walter F Block, Richard Kijowski, Alexey A Samsonov
We present MRiLab, a new comprehensive simulator for large-scale realistic MRI simulations on a regular PC equipped with a modern graphical processing unit (GPU). MRiLab combines realistic tissue modeling with numerical virtualization of an MRI system and scanning experiment to enable assessment of a broad range of MRI approaches including advanced quantitative MRI methods inferring microstructure on a sub-voxel level. A flexible representation of tissue microstructure is achieved in MRiLab by employing the generalized tissue model with multiple exchanging water and macromolecular proton pools rather than a system of independent proton isochromats typically used in previous simulators...
February 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28113563/adaptive-6-dof-haptic-contact-stiffness-using-the-gauss-map
#17
Hongyi Xu, Jernej Barbic
The penalty method is a popular approach to resolving contact in haptic rendering. In simulations involving complex distributed contact, there are, however, many simultaneous individual contacts. These contacts have normals pointing in several directions, many of which may be parallel, causing the stiffness effectively to add up in a temporally highly-varying and unpredictable way. Consequently, penalty-based simulation suffers from stability problems. Previous methods tackled this problem using implicit integration, or simply by scaling the stiffness down globally by the number of contacts...
April 25, 2016: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28113361/analysis-of-negatively-focused-ultrasound-detectors-in-optoacoustic-tomography
#18
Gilad Drozdov, Amir Rosenthal
In optoacoustic tomography, negatively focused transducers may be used for improving the tangential image resolution while preserving a high signal-to-noise ratio. Commonly, image reconstruction in such scenarios is facilitated by the use of the virtual-detector approach. Although the validity of this approach has been experimentally verified, it is based on an approximation whose effect on optoacoustic image reconstruction has not yet been studied. In this paper, we analyze the response of the negatively focused acoustic detectors in 2D in both time and frequency domain...
September 7, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28092563/effects-of-different-types-of-virtual-reality-display-on-presence-and-learning-in-a-safety-training-scenario
#19
Fabio Buttussi, Luca Chittaro
The increasing availability of head-mounted displays (HMDs) for home use motivates the study of the possible effects that adopting this new hardware might have on users. Moreover, while the impact of display type has bee respectively representative of: (i) desktop VR (a standard desktop monitor), (ii) many setups for immersive VR used in the literature (an HMD with narrow field of view and a 3-DOF tracker), and (iii) new setups for immersive home VR (an HMD with wide field of view and 6-DOF tracker). We assessed effects on knowledge gain, and different self-reported measures (self-efficacy, engagement, presence)...
January 16, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28064082/novel-flavonol-analogues-as-potential-inhibitors-of-jmjd3-histone-demethylase-a-study-based-on-molecular-modelling
#20
Sanchari Basu Mallik, Aravinda Pai, Rekha R Shenoy, B S Jayashree
Epigenetic modulation of gene expression has drawn enormous attention among researchers globally in the present scenario. Since their discovery, Jmj-C histone demethylases were identified as useful markers in understanding the role of epigenetics in inflammatory conditions and in cancer as well. This has created arousal of interest in search of suitable candidates. Potential inhibitors from various other scaffolds such as hydroxyquinolines, hydroxamic acids and triazolopyridines have already been identified and reported...
December 13, 2016: Journal of Molecular Graphics & Modelling
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