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https://www.readbyqxmd.com/read/28916149/wavelet-based-tracking-of-bacteria-in-unreconstructed-off-axis-holograms
#1
Zach Marin, J Kent Wallace, Jay Nadeau, Andre Khalil
We propose an automated wavelet-based method of tracking particles in unreconstructed off-axis holograms to provide rough estimates of the presence of motion and particle trajectories in digital holographic microscopy (DHM) time series. The wavelet transform modulus maxima segmentation method is adapted and tailored to extract Airy-like diffraction disks, which represent bacteria, from DHM time series. In this exploratory analysis, the method shows potential for estimating bacterial tracks in low-particle-density time series, based on a preliminary analysis of both living and dead Serratia marcescens, and for rapidly providing a single-bit answer to whether a sample chamber contains living or dead microbes or is empty...
September 12, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28914609/effect-of-multiple-perfusion-components-on-pseudo-diffusion-coefficient-in-intravoxel-incoherent-motion-imaging
#2
Zi-Xiang Kuai, Wan-Yu Liu, Yue-Min Zhu
The aim of this work was to investigate the effect of multiple perfusion components on the pseudo-diffusion coefficient D* in the bi-exponential intravoxel incoherent motion (IVIM) model. Simulations were first performed to examine how the presence of multiple perfusion components influences D*. The real data of livers (n=31), spleens (n=31) and kidneys (n=31) of 31 volunteers was then acquired using DWI for in vivo study and the number of perfusion components in these tissues was determined together with their perfusion fraction and D*, using an adaptive multi-exponential IVIM model...
September 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28913728/shoulder-strengthening-exercises-adapted-to-specific-shoulder-pathologies-can-be-selected-using-new-simulation-techniques-a-pilot-study
#3
Caecilia Charbonnier, Alexandre Lädermann, Bart Kevelham, Sylvain Chagué, Pierre Hoffmeyer, Nicolas Holzer
PURPOSE: Shoulder strength training exercises represent a major component of rehabilitation protocols designed for conservative or postsurgical management of shoulder pathologies. Numerous methods are described for exercising each shoulder muscle or muscle group. Limited information is available to assess potential deleterious effects of individual methods with respect to specific shoulder pathologies. Thus, the goal of this pilot study was to use a patient-specific 3D measurement technique coupling medical imaging and optical motion capture for evaluation of a set of shoulder strength training exercises regarding glenohumeral, labral and subacromial compression, as well as elongation of the rotator cuff muscles...
September 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28910772/semantic-driven-generation-of-hyperlapse-from-360-formula-see-text-video
#4
Wei-Sheng Lai, Yujia Huang, Neel Joshi, Christopher Buehler, Ming-Hsuan Yang, Sing Bing Kang
We present a system for converting a fully panoramic (360[Formula: see text]) video into a normal field-of-view (NFOV) hyperlapse for an optimal viewing experience. Our system exploits visual saliency and semantics to non-uniformly sample in space and time for generating hyperlapses. In addition, users can optionally choose objects of interest for customizing the hyperlapses. We first stabilize an input 360[Formula: see text] video by smoothing the rotation between adjacent frames and then compute regions of interest and saliency scores...
September 11, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28901749/a-highly-stretchable-and-washable-all-yarn-based-self-charging-knitting-power-textile-composed-of-fiber-triboelectric-nanogenerators-and-supercapacitors
#5
Kai Dong, Yi-Cheng Wang, Jianan Deng, Yejing Dai, Steven L Zhang, Haiyang Zou, Bohong Gu, Baozhong Sun, Zhong Lin Wang
Rapid advancements in stretchable and multifunctional wearable electronics impose a challenge on corresponding power devices that they should have comparable portability and stretchability. Here, we report a highly stretchable and washable all-yarn-based self-charging knitting power textile that enables both biomechanical energy harvesting and simultaneously energy storing by hybridizing triboelectrical nanogenerator (TENG) and supercapacitor (SC) into one fabric. With the weft-knitting technique, the power textile is qualified with high elasticity, flexibility, and stretchability, which can adapt to complex mechanical deformations...
September 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28901610/low-dose-dynamic-myocardial-perfusion-ct-imaging-using-a-motion-adaptive-sparsity-prior
#6
Zhaoying Bian, Dong Zeng, Zhang Zhang, Changfei Gong, Xiumei Tian, Gang Yan, Jing Huang, Hong Guo, Bo Chen, Jing Zhang, Qianjin Feng, Wufan Chen, Jianhua Ma
PURPOSE: Dynamic myocardial perfusion computed tomography (DM-PCT) imaging offers benefits over quantitative assessment of myocardial blood flow (MBF) for diagnosis and risk stratification of coronary artery disease. However, one major drawback of DM-PCT imaging is that a high radiation level is imparted by repeated scanning. To address this issue, in this work, we developed a statistical iterative reconstruction algorithm based on the penalized weighted least-squares (PWLS) scheme by incorporating a motion adaptive sparsity prior (MASP) model to achieve high-quality DM-PCT imaging with low tube current dynamic data acquisition...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28900781/submillisievert-imaging-protocol-using-full-reconstruction-and-advanced-patient-motion-correction-in-320-row-area-detector-coronary-ct-angiography
#7
Yuko Kawaguchi, Shinichiro Fujimoto, Kazuhisa Takamura, Etsuro Kato, Shoko Suda, Rie Matsumori, Makoto Hiki, Kanako K Kumamaru, Hiroyuki Daida
Radiation exposure remains a concern in the use of coronary CT angiography (CCTA). Full reconstruction (Full) and reconstruction using advanced patient motion correction (APMC) could obtain a lower radiation dose using low tube current scanning in a 320-row Area Detector CT (320-ADCT). The radiation dose for an imaging protocol using Full and APMC in daily practice was estimated. A total of 209 patients who underwent CCTA in 1 rotation scanning with 100 kv and adaptive iterative dose reduction 3D in 320-ADCT were enrolled...
September 12, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28900120/recurrent-network-dynamics-reconciles-visual-motion-segmentation-and-integration
#8
N V Kartheek Medathati, James Rankin, Andrew I Meso, Pierre Kornprobst, Guillaume S Masson
In sensory systems, a range of computational rules are presumed to be implemented by neuronal subpopulations with different tuning functions. For instance, in primate cortical area MT, different classes of direction-selective cells have been identified and related either to motion integration, segmentation or transparency. Still, how such different tuning properties are constructed is unclear. The dominant theoretical viewpoint based on a linear-nonlinear feed-forward cascade does not account for their complex temporal dynamics and their versatility when facing different input statistics...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28895737/migration-of-phospholipid-vesicles-can-be-selectively-driven-by-concentration-gradients-of-metal-chloride-solutions
#9
Atsuji Kodama, Yuka Sakuma, Masayuki Imai, Toshihiro Kawakatsu, Nicolas Puff, Miglena I Angelova
We have investigated migrations of phospholipid vesicles under the concentration gradients of metal ions. We micro-injected metal chloride solutions, monovalent (NaCl and KCl), divalent (CaCl2 and MgCl2), and trivalent (LaCl3) salts, toward phospholipid giant vesicles (GVs) composed of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC). For NaCl, CaCl2, and MgCl2 solutions, the GVs migrated straight toward the tip of the micro-pipette in response to the concentration gradients, whereas for KCl and LaCl3, GVs moved to the opposite direction...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28894756/relationships-between-tibiofemoral-contact-forces-and-cartilage-morphology-at-2-to-3-years-after-single-bundle-hamstring-anterior-cruciate-ligament-reconstruction-and-in-healthy-knees
#10
David John Saxby, Adam L Bryant, Xinyang Wang, Luca Modenese, Pauline Gerus, Jason M Konrath, Kim L Bennell, Karine Fortin, Tim Wrigley, Flavia M Cicuttini, Christopher J Vertullo, Julian A Feller, Tim Whitehead, Price Gallie, David G Lloyd
BACKGROUND: Prevention of knee osteoarthritis (OA) following anterior cruciate ligament (ACL) rupture and reconstruction is vital. Risk of postreconstruction knee OA is markedly increased by concurrent meniscal injury. It is unclear whether reconstruction results in normal relationships between tibiofemoral contact forces and cartilage morphology and whether meniscal injury modulates these relationships. HYPOTHESES: Since patients with isolated reconstructions (ie, without meniscal injury) are at lower risk for knee OA, we predicted that relationships between tibiofemoral contact forces and cartilage morphology would be similar to those of normal, healthy knees 2 to 3 years postreconstruction...
August 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28892157/adaptability-and-specificity-of-inhibition-processes-in-distractor-induced-blindness
#11
Gesche N Winther, Michael Niedeggen
In a rapid serial visual presentation task, inhibition processes cumulatively impair processing of a target possessing distractor properties. This phenomenon-known as distractor-induced blindness-has thus far only been elicited using dynamic visual features, such as motion and orientation changes. In three ERP experiments, we used a visual object feature-color-to test for the adaptability and specificity of the effect. In Experiment I, participants responded to a color change (target) in the periphery whose onset was signaled by a central cue...
September 11, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28891595/the-effect-of-bolus-volume-on-laryngeal-closure-and-ues-opening-in-swallowing-kinematic-analysis-using-320-row-area-detector-ct-study
#12
Seiko Shibata, Yoko Inamoto, Eiichi Saitoh, Hitoshi Kagaya, Yoichiro Aoyagi, Kikuo Ota, Ryoko Akahori, Naoko Fujii, Jeffrey B Palmer, Marlis Gonzalez Fernandez
This study investigated the effects of three different volumes of honey-thick liquid on the temporal characteristics of swallowing. Twenty six healthy subjects (15 males, 11 females) underwent 320-Row Area Detector CT scan while swallowing 3, 10, and 20ml of honey-thick liquid barium. Three-dimensional images were created at 10 images/s. Kinematic events involving six structures (velopharynx, hyoid bone, epiglottis, laryngeal vestibule (LV), true vocal cords (TVC), upper esophageal sphincter (UES)) and timing of bolus movement were timed using frame by frame analysis...
September 11, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28887891/the-involvement-of-centralized-and-distributed-processes-in-sub-second-time-interval-adaptation-an-erp-investigation-of-apparent-motion
#13
Utku Kaya, Fazilet Zeynep Yildirim, Hulusi Kafaligonul
Accumulating evidence suggests that the timing of brief stationary sounds affects visual motion perception. Recent studies have shown that auditory time interval can alter apparent motion perception not only through concurrent stimulation but also through brief adaptation. The adaptation aftereffects for auditory time intervals were found to be similar to those for visual time intervals, suggesting the involvement of a central timing mechanism. To understand the nature of cortical processes underlying such aftereffects, we adapted observers to different time intervals by using either brief sounds or visual flashes and examined the evoked activity to the subsequently presented visual apparent motion...
September 9, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28886480/intelligent-visual-localization-of-wireless-capsule-endoscopes-enhanced-by-color-information
#14
George Dimas, Evaggelos Spyrou, Dimitris K Iakovidis, Anastasios Koulaouzidis
Wireless capsule endoscopy (WCE) is performed with a miniature swallowable endoscope enabling the visualization of the whole gastrointestinal (GI) tract. One of the most challenging problems in WCE is the localization of the capsule endoscope (CE) within the GI lumen. Contemporary, radiation-free localization approaches are mainly based on the use of external sensors and transit time estimation techniques, with practically low localization accuracy. Latest advances for the solution of this problem include localization approaches based solely on visual information from the CE camera...
September 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28885964/cervical-joint-position-sense-in-hypobaric-conditions-a-randomized-double-blind-controlled-trial
#15
Diana Bagaianu, Damien Van Tiggelen, N Duvigneaud, Veerle Stevens, Danny Schroyen, Dirk Vissenaeken, Gino D'Hondt, Laurent Pitance
Well-adapted motor actions require intact and well-integrated information from all of the sensory systems, specifically the visual, vestibular, and somatosensory systems, including proprioception. Proprioception is involved in the sensorimotor control by providing the central nervous system with an updated body schema of the biomechanical and spatial properties of the body parts. With regard to the cervical spine, proprioceptive information from joint and muscle mechanoreceptors is integrated with vestibular and visual feedback to control head position, head orientation, and whole body posture...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28885742/adaptive-bulk-motion-exclusion-for-improved-robustness-of-abdominal-magnetic-resonance-imaging
#16
Bjorn Stemkens, Thomas Benkert, Hersh Chandarana, Mark E Bittman, Cornelis A T Van den Berg, Jan J W Lagendijk, Daniel K Sodickson, Rob H N Tijssen, Kai Tobias Block
Non-Cartesian magnetic resonance imaging (MRI) sequences have shown great promise for abdominal examination during free breathing, but break down in the presence of bulk patient motion (i.e. voluntary or involuntary patient movement resulting in translation, rotation or elastic deformations of the body). This work describes a data-consistency-driven image stabilization technique that detects and excludes bulk movements during data acquisition. Bulk motion is identified from changes in the signal intensity distribution across different elements of a multi-channel receive coil array...
September 8, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28885509/modeling-surgical-technical-skill-using-expert-assessment-for-automated-computer-rating
#17
David P Azari, Lane L Frasier, Sudha R Pavuluri Quamme, Caprice C Greenberg, Carla M Pugh, Jacob A Greenberg, Robert G Radwin
OBJECTIVE: Computer vision was used to predict expert performance ratings from surgeon hand motions for tying and suturing tasks. SUMMARY BACKGROUND DATA: Existing methods, including the objective structured assessment of technical skills (OSATS), have proven reliable, but do not readily discriminate at the task level. Computer vision may be used for evaluating distinct task performance throughout an operation. METHODS: Open surgeries was videoed and surgeon hands were tracked without using sensors or markers...
September 6, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28885166/robust-fusion-of-color-and-depth-data-for-rgb-d-target-tracking-using-adaptive-range-invariant-depth-models-and-spatio-temporal-consistency-constraints
#18
Jingjing Xiao, Rustam Stolkin, Yuqing Gao, Ales Leonardis
This paper presents a novel robust method for single target tracking in RGB-D images, and also contributes a substantial new benchmark dataset for evaluating RGB-D trackers. While a target object's color distribution is reasonably motion-invariant, this is not true for the target's depth distribution, which continually varies as the target moves relative to the camera. It is therefore nontrivial to design target models which can fully exploit (potentially very rich) depth information for target tracking. For this reason, much of the previous RGB-D literature relies on color information for tracking, while exploiting depth information only for occlusion reasoning...
September 6, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28884616/effect-of-walking-in-footwear-with-varying-heel-sole-differentials-on-shank-and-foot-segment-kinematics
#19
Elaine Owen, Stefania Fatone, Andrew Hansen
BACKGROUND: When walking in footwear with a positive "heel sole differential", the sagittal kinematics of the base of the footwear appear to mimic normal barefoot foot kinematics, creating an "effective foot," yet sagittal shank, thigh, and trunk kinematics appear to remain unchanged. These observations have not been quantified. OBJECTIVES: To quantify these observations by assessing the effect of different heel sole differentials on sagittal shank and foot segment kinematics of able-bodied walking...
September 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28880158/highly-articulated-kinematic-structure-estimation-combining-motion-and-skeleton-information
#20
Hyung Jin Chang, Yiannis Demiris
In this paper, we present a novel framework for unsupervised kinematic structure learning of complex articulated objects from a single-view 2D image sequence. In contrast to prior motion-based methods, which estimate relatively simple articulations, our method can generate arbitrarily complex kinematic structures with skeletal topology via a successive iterative merging strategy. The iterative merge process is guided by a density weighted skeleton map which is generated from a novel object boundary generation method from sparse 2D feature points...
September 4, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
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