keyword
MENU ▼
Read by QxMD icon Read
search

Motion Capture

keyword
https://www.readbyqxmd.com/read/27933492/comparative-analysis-of-speech-impairment-and-upper-limb-motor-dysfunction-in-parkinson-s-disease
#1
Jan Rusz, Tereza Tykalová, Radim Krupička, Kateřina Zárubová, Michal Novotný, Robert Jech, Zoltán Szabó, Evžen Růžička
It is currently unknown whether speech and limb motor effectors in Parkinson's disease (PD) are controlled by similar underlying brain processes. Based on computerized objective analysis, the aim of this study was to evaluate potential correlation between speech and mechanical tests of upper limb motor function. Speech and upper limb motor tests were performed in 22 PD patients and 22 healthy controls. Quantitative acoustic analyses of eight key speech dimensions of hypokinetic dysarthria, including quality of voice, sequential motion rates, consonant articulation, vowel articulation, average loudness, loudness variability, pitch variability, and number of pauses, were performed...
December 8, 2016: Journal of Neural Transmission
https://www.readbyqxmd.com/read/27933358/embodiment-and-the-origin-of-interval-timing-kinematic-and-electromyographic-data
#2
Caspar Addyman, Sinead Rocha, Lilian Fautrelle, Robert M French, Elizabeth Thomas, Denis Mareschal
Recent evidence suggests that interval timing (the judgment of durations lasting from approximately 500 ms. to a few minutes) is closely coupled to the action control system. We used surface electromyography (EMG) and motion capture technology to explore the emergence of this coupling in 4-, 6-, and 8-month-olds. We engaged infants in an active and socially relevant arm-raising task with seven cycles and response period. In one condition, cycles were slow (every 4 s); in another, they were fast (every 2 s)...
December 9, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27933243/model-based-extended-quaternion-kalman-filter-to-inertial-orientation-tracking-of-arbitrary-kinematic-chains
#3
Agnieszka Szczęsna, Przemysław Pruszowski
Inertial orientation tracking is still an area of active research, especially in the context of out-door, real-time, human motion capture. Existing systems either propose loosely coupled tracking approaches where each segment is considered independently, taking the resulting drawbacks into account, or tightly coupled solutions that are limited to a fixed chain with few segments. Such solutions have no flexibility to change the skeleton structure, are dedicated to a specific set of joints, and have high computational complexity...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27925602/bayesian-intent-prediction-in-object-tracking-using-bridging-distributions
#4
Bashar I Ahmad, James K Murphy, Patrick M Langdon, Simon J Godsill
In several application areas, such as human computer interaction, surveillance and defence, determining the intent of a tracked object enables systems to aid the user/operator and facilitate effective, possibly automated, decision making. In this paper, we propose a probabilistic inference approach that permits the prediction, well in advance, of the intended destination of a tracked object and its future trajectory. Within the framework introduced here, the observed partial track of the object is modeled as being part of a Markov bridge terminating at its destination, since the target path, albeit random, must end at the intended endpoint...
December 2, 2016: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/27925233/quantification-and-analysis-of-leaflet-flutter-on-biological-prosthetic-cardiac-valves
#5
Artur H de F Avelar, Jean A Canestri, Camila Bim, Maíra G M Silva, Rudolf Huebner, Marcos Pinotti
The use of porcine or bovine pericardium biological cardiac valves has as its main disadvantage a relatively short lifespan, with failures due to calcification and fatigue. Increasing these valves' durability constitutes a great challenge. An understudied phenomenon is the effect of flutter, an oscillation of the leaflets that can cause regurgitation and accelerate calcification and fatigue. As a starting point to study how to reduce or prevent these oscillations, a method was developed to quantify the flutter frequencies occurring at the point of the valve's full opening...
December 7, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27918704/comparison-of-3d-joint-angles-measured-with-the-kinect-2-0-skeletal-tracker-versus-a-marker-based-motion-capture-system
#6
Trent M Guess, Swithin Razu, Amirhossein Jahandar, Marjorie Skubic, Zhiyu Huo
The Microsoft Kinect is becoming a widely used tool for inexpensive, portable measurement of human motion with the potential to support clinical assessments of performance and function. In this study, the relative osteokinematic Cardan joint angles of the hip and knee were calculated using the Kinect 2.0 skeletal tracker. The pelvis segments of the default skeletal model were reoriented and three-dimensional joint angles were compared to a marker-based system during a drop vertical jump and a hip abduction motion...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27918696/validation-of-inertial-measurement-units-for-upper-body-kinematics
#7
Melissa M B Morrow, Bethany Lowndes, Emma Fortune, Kenton R Kaufman, Susan Hallbeck
The purpose of this study was to validate a commercially available IMU system against a standard lab-based motion capture system for the measurement of shoulder elevation, elbow flexion, trunk flexion/extension and neck flexion/extension kinematics. The validation analyses were applied to six surgical faculty members performing a standard, simulated surgical training task that mimics minimally invasive surgery. Three-dimensional joint kinematics were simultaneously recorded by an optical motion capture system and an IMU system with six sensors placed on the head, chest, and bilateral upper and lower arms...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27917249/perspectives-in-flow-based-microfluidic-gradient-generators-for-characterizing-bacterial-chemotaxis
#8
Christopher J Wolfram, Gary W Rubloff, Xiaolong Luo
Chemotaxis is a phenomenon which enables cells to sense concentrations of certain chemical species in their microenvironment and move towards chemically favorable regions. Recent advances in microbiology have engineered the chemotactic properties of bacteria to perform novel functions, but traditional methods of characterizing chemotaxis do not fully capture the associated cell motion, making it difficult to infer mechanisms that link the motion to the microbiology which induces it. Microfluidics offers a potential solution in the form of gradient generators...
November 2016: Biomicrofluidics
https://www.readbyqxmd.com/read/27914730/quantitative-comparison-of-operative-skill-using-2-and-3-dimensional-monitors-during-laparoscopic-phantom-tasks
#9
Masayasu Nishi, Shingo Kanaji, Yoshito Otake, Hitoshi Harada, Masashi Yamamoto, Taro Oshikiri, Tetsu Nakamura, Satoshi Suzuki, Yuki Suzuki, Yuta Hiasa, Yoshinobu Sato, Yoshihiro Kakeji
BACKGROUND: The recent development of stereoscopic images using 3-dimensional monitors is expected to improve techniques for laparoscopic operation. Several studies have reported technical advantages in using 3-dimensional monitors with regard to operative accuracy and working speed, but there are few reports that analyze forceps motions by 3-dimensional optical tracking systems during standardized laparoscopic phantom tasks. We attempted to develop a 3-dimensional motion analysis system for assessing laparoscopic tasks and to clarify the efficacy of using stereoscopic images from a 3-dimensional monitor to track forceps movement during laparoscopy...
November 30, 2016: Surgery
https://www.readbyqxmd.com/read/27913628/kinect-system-in-home-based-cardiovascular-rehabilitation
#10
Ágata Vieira, Joaquim Gabriel, Cristina Melo, Jorge Machado
Cardiovascular diseases lead to a high consumption of financial resources. An important part of the recovery process is the cardiovascular rehabilitation. This study aimed to present a new cardiovascular rehabilitation system to 11 outpatients with coronary artery disease from a Hospital in Porto, Portugal, later collecting their opinions. This system is based on a virtual reality game system, using the Kinect sensor while performing an exercise protocol which is integrated in a home-based cardiovascular rehabilitation programme, with a duration of 6 months and at the maintenance phase...
December 1, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/27912155/home-based-interventions-improve-trained-but-not-novel-dual-task-balance-performance-in-older-adults-a-randomized-controlled-trial
#11
Suleeporn Wongcharoen, Somporn Sungkarat, Peeraya Munkhetvit, Vipul Lugade, Patima Silsupadol
The purpose of this study was to compare the efficacy of four different home-based interventions on dual-task balance performance and to determine the generalizability of the four trainings to untrained tasks. Sixty older adults, aged 65 and older, were randomly assigned to one of four home-based interventions: single-task motor training, single-task cognitive training, dual-task motor-cognitive training, and dual-task cognitive-cognitive training. Participants received 60-min individualized training sessions, 3 times a week for 4 weeks...
November 22, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27912153/overground-vs-treadmill-walking-on-biomechanical-energy-harvesting-an-energetics-and-emg-study
#12
Jean-Paul Martin, Qingguo Li
A biomechanical energy harvester is a wearable device that generates electricity from human motion. Walking on a treadmill has been used almost exclusively by researchers for studying the energetic effects of biomechanical energy harvesters and wearable robotics. A treadmill provides the advantage of having long duration trials within a stationary motion capture volume. However, no consensus exists on whether the results from treadmill walking accurately represent overground walking. We aim to investigate how a biomechanical energy harvester performs overground compared to on a treadmill by measuring energy expenditure and muscle activity...
November 19, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27910686/a-comparison-between-soft-x-ray-and-magnetic-phase-data-on-the-madison-symmetric-torus
#13
P D VanMeter, P Franz, L M Reusch, J S Sarff, D J Den Hartog
The Soft X-Ray (SXR) tomography system on the Madison Symmetric Torus uses four cameras to determine the emissivity structure of the plasma. This structure should directly correspond to the structure of the magnetic field; however, there is an apparent phase difference between the emissivity reconstructions and magnetic field reconstructions when using a cylindrical approximation. The difference between the phase of the dominant rotating helical mode of the magnetic field and the motion of the brightest line of sight for each SXR camera is dependent on both the camera viewing angle and the plasma conditions...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27908178/a-probability-based-multi-cycle-sorting-method-for-4d-mri-a-simulation-study
#14
Xiao Liang, Fang-Fang Yin, Yilin Liu, Jing Cai
PURPOSE: To develop a novel probability-based sorting method capable of generating multiple breathing cycles of 4D-MRI images and to evaluate performance of this new method by comparing with conventional phase-based methods in terms of image quality and tumor motion measurement. METHODS: Based on previous findings that breathing motion probability density function (PDF) of a single breathing cycle is dramatically different from true stabilized PDF that resulted from many breathing cycles, it is expected that a probability-based sorting method capable of generating multiple breathing cycles of 4D images may capture breathing variation information missing from conventional single-cycle sorting methods...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27900717/intravenous-fluids-balancing-solutions
#15
REVIEW
Ewout J Hoorn
The topic of intravenous (IV) fluids may be regarded as "reverse nephrology", because nephrologists usually treat to remove fluids rather than to infuse them. However, because nephrology is deeply rooted in fluid, electrolyte, and acid-base balance, IV fluids belong in the realm of our specialty. The field of IV fluid therapy is in motion due to the increasing use of balanced crystalloids, partly fueled by the advent of new solutions. This review aims to capture these recent developments by critically evaluating the current evidence base...
November 29, 2016: Journal of Nephrology
https://www.readbyqxmd.com/read/27897997/thermal-resilience-of-feeding-kinematics-may-contribute-to-the-spread-of-invasive-fishes-in-light-of-climate-change
#16
Ralph Turingan, Tyler Sloan
As a consequence of global warming, tropical invasive species are expected to expand their range pole-ward, extending their negative impacts to previously undisturbed, high-latitude ecosystems. Investigating the physiological responses of invasive species to environmental temperature is important because the coupled effects of climate change and species invasion on ecosystems could be more alarming than the effects of each phenomenon independently. Especially in poikilotherms, the rate of motion in muscle-driven biomechanical systems is expected to double for every 10 °C increase in temperature...
November 25, 2016: Biology
https://www.readbyqxmd.com/read/27897410/androgen-deprivation-causes-selective-deficits-in-the-biomechanical-leg-muscle-function-of-men-during-walking-a-prospective-case-control-study
#17
Ada S Cheung, Hans Gray, Anthony G Schache, Rudolf Hoermann, Daryl Lim Joon, Jeffrey D Zajac, Marcus G Pandy, Mathis Grossmann
BACKGROUND: Although muscle mass declines with testosterone deficiency in men, previous studies of muscle function have not demonstrated consistent deficits, likely due to relatively insensitive methodology. Our objective was to determine the effects of testosterone deprivation on the biomechanical function of individual lower-limb muscles. METHODS: We conducted a 12-month prospective, observational case-control study of 34 men newly commencing androgen deprivation treatment (ADT) for prostate cancer and 29 age-matched prostate cancer controls...
August 2, 2016: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/27896014/single-frame-rapid-autofocusing-for-brightfield-and-fluorescence-whole-slide-imaging
#18
Jun Liao, Liheng Bian, Zichao Bian, Zibang Zhang, Charmi Patel, Kazunori Hoshino, Yonina C Eldar, Guoan Zheng
A critical consideration for whole slide imaging (WSI) platform is to perform accurate autofocusing at high speed. Typical WSI systems acquire a z-stack of sample images and determine the best focal position by maximizing a figure of merit. This strategy, however, has suffered from several limitations, including low speed due to multiple image acquisitions, relatively low accuracy of focal plane estimation, short axial range for autofocusing, and difficulties in handling transparent samples. By exploring the autocorrelation property of the tissue sections, we report a novel single-frame autofocusing scheme to address the above challenges...
November 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27895994/motion-corrected-fourier-ptychography
#19
Liheng Bian, Guoan Zheng, Kaikai Guo, Jinli Suo, Changhuei Yang, Feng Chen, Qionghai Dai
Fourier ptychography (FP) is a recently proposed computational imaging technique for high space-bandwidth product imaging. In real setups such as endoscope and transmission electron microscope, the common sample motion largely degrades the FP reconstruction and limits its practicability. In this paper, we propose a novel FP reconstruction method to efficiently correct for unknown sample motion. Specifically, we adaptively update the sample's Fourier spectrum from low spatial-frequency regions towards high spatial-frequency ones, with an additional motion recovery and phase-offset compensation procedure for each sub-spectrum...
November 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27891074/interactive-sonification-of-spontaneous-movement-of-children-cross-modal-mapping-and-the-perception-of-body-movement-qualities-through-sound
#20
Emma Frid, Roberto Bresin, Paolo Alborno, Ludvig Elblaus
In this paper we present three studies focusing on the effect of different sound models in interactive sonification of bodily movement. We hypothesized that a sound model characterized by continuous smooth sounds would be associated with other movement characteristics than a model characterized by abrupt variation in amplitude and that these associations could be reflected in spontaneous movement characteristics. Three subsequent studies were conducted to investigate the relationship between properties of bodily movement and sound: (1) a motion capture experiment involving interactive sonification of a group of children spontaneously moving in a room, (2) an experiment involving perceptual ratings of sonified movement data and (3) an experiment involving matching between sonified movements and their visualizations in the form of abstract drawings...
2016: Frontiers in Neuroscience
keyword
keyword
71141
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"