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Feature Tracking

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https://www.readbyqxmd.com/read/29455260/performance-evaluation-of-state-of-the-art-local-feature-detectors-and-descriptors-in-the-context-of-longitudinal-registration-of-retinal-images
#1
Sajib K Saha, Di Xiao, Shaun Frost, Yogesan Kanagasingam
In this paper we systematically evaluate the performance of several state-of-the-art local feature detectors and descriptors in the context of longitudinal registration of retinal images. Longitudinal (temporal) registration facilitates to track the changes in the retina that has happened over time. A wide number of local feature detectors and descriptors exist and many of them have already applied for retinal image registration, however, no comparative evaluation has been made so far to analyse their respective performance...
February 17, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29454776/cardiac-magnetic-resonance-myocardial-feature-tracking-for-optimized-prediction-of-cardiovascular-events-following-myocardial-infarction
#2
Ingo Eitel, Thomas Stiermaier, Torben Lange, Karl-Philipp Rommel, Alexander Koschalka, Johannes T Kowallick, Joachim Lotz, Shelby Kutty, Matthias Gutberlet, Gerd Hasenfuß, Holger Thiele, Andreas Schuster
OBJECTIVES: The aims of the study were to assess the prognostic significance of cardiac magnetic resonance myocardial feature tracking (CMR-FT) in a large multicenter study and to evaluate the most potent CMR-FT predictor of hard clinical events following myocardial infarction (MI). BACKGROUND: CMR-FT is a new method that allows accurate assessment of global and regional circumferential, radial, and longitudinal myocardial strain. The prognostic value of CMR-FT in patients with reperfused MI is unknown...
February 9, 2018: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29453548/-big-data-from-clinical-routine
#3
REVIEW
U Mansmann
BACKGROUND: Over the past 100 years, evidence-based medicine has undergone several fundamental changes. Through the field of physiology, medical doctors were introduced to the natural sciences. Since the late 1940s, randomized and epidemiological studies have come to provide the evidence for medical practice, which led to the emergence of clinical epidemiology as a new field in the medical sciences. Within the past few years, big data has become the driving force behind the vision for having a comprehensive set of health-related data which tracks individual healthcare histories and consequently that of large populations...
February 16, 2018: Zeitschrift Für Rheumatologie
https://www.readbyqxmd.com/read/29452312/effects-of-higher-versus-lower-threat-contexts-on-pain-related-visual-attention-biases-an-eye-tracking-study-of-chronic-pain
#4
Todd Jackson, Lin Su, Yang Wang
In this research, we examined effects of higher versus lower threat contexts on attention biases in more and less pain-fearful chronic pain subgroups via eye-tracking methodology. Within a mixed chronic pain sample (69 women, 29 men), biases in orienting and maintenance of visual attention were assessed during the standardized image pair presentation phase (2000ms) of a modified visual dot probe task featuring painful-neutral (P-N) image pairs (lower threat context) and a parallel task in which these P-N pairs cued potential pain (higher threat context)...
February 13, 2018: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/29451495/perceptually-aware-image-retargeting-for-mobile-devices
#5
Yinzuo Zhou, Luming Zhang, Chao Zhang, Ping Li, Xuelong Li
Retargeting aims at adapting an original high-resolution photograph/video to a low-resolution screen with an arbitrary aspect ratio. Conventional approaches are generally based on desktop PCs, since the computation might be intolerable for mobile platforms (especially when retargeting videos). Typically, only low-level visual features are exploited, and human visual perception is not well encoded. In this paper, we propose a novel retargeting framework that rapidly shrinks a photograph/video by leveraging human gaze behavior...
May 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29450711/renal-fat-fraction-and-diffusion-tensor-imaging-in-patients-with-early-stage-diabetic-nephropathy
#6
Yuan-Cheng Wang, Yinglian Feng, Chun-Qiang Lu, Shenghong Ju
OBJECTIVE: To investigate the renal fat fraction and water molecular diffusion features in patients with early-stage DN using Dixon imaging and diffusion tensor imaging (DTI). METHODS: Sixty-one type 2 diabetics (normoalbuminuria: n = 40; microalbuminuria: n = 21) and 34 non-diabetic volunteers were included. All participants received three-point Dixon imaging and DTI using a 3.0-T magnetic resonance imager. The fat fraction [FF] and DTI features [fractional anisotropy (FA), apparent diffusion coefficient (ADC), tract counts and length from DTI tractography] were collected...
February 15, 2018: European Radiology
https://www.readbyqxmd.com/read/29438421/a-parallel-spatiotemporal-saliency-and-discriminative-online-learning-method-for-visual-target-tracking-in-aerial-videos
#7
Amirhossein Aghamohammadi, Mei Choo Ang, Elankovan A Sundararajan, Ng Kok Weng, Marzieh Mogharrebi, Seyed Yashar Banihashem
Visual tracking in aerial videos is a challenging task in computer vision and remote sensing technologies due to appearance variation difficulties. Appearance variations are caused by camera and target motion, low resolution noisy images, scale changes, and pose variations. Various approaches have been proposed to deal with appearance variation difficulties in aerial videos, and amongst these methods, the spatiotemporal saliency detection approach reported promising results in the context of moving target detection...
2018: PloS One
https://www.readbyqxmd.com/read/29436496/repeatable-group-differences-in-the-collective-behaviour-of-stickleback-shoals-across-ecological-contexts
#8
Jolle W Jolles, Kate L Laskowski, Neeltje J Boogert, Andrea Manica
Establishing how collective behaviour emerges is central to our understanding of animal societies. Previous research has highlighted how universal interaction rules shape collective behaviour, and that individual differences can drive group functioning. Groups themselves may also differ considerably in their collective behaviour, but little is known about the consistency of such group variation, especially across different ecological contexts that may alter individuals' behavioural responses. Here, we test if randomly composed groups of sticklebacks differ consistently from one another in both their structure and movement dynamics across an open environment, an environment with food, and an environment with food and shelter...
February 14, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29433367/experimental-animal-models-for-rheumatoid-arthritis
#9
Narayan Choudhary, Lokesh K Bhatt, Kedar S Prabhavalkar
Rheumatoid Arthritis (RA) is an autoimmune systemic disorder of unknown etiology and is characterized by chronic inflammation and synovial infiltration of immune cells. RA is associated with decreased life expectancy and quality of life. The research on RA is greatly simplified by animal models that help us to investigate the complex system involving inflammation, immunological tolerance and autoimmunity. The animal models of RA with a proven track record of predictability for efficacy in humans include: collagen type II induced arthritis in rats as well as mice, adjuvant induced arthritis in rats and antigen induced arthritis in several species...
February 12, 2018: Immunopharmacology and Immunotoxicology
https://www.readbyqxmd.com/read/29432454/history-dependence-in-insect-flight-decisions-during-odor-tracking
#10
Rich Pang, Floris van Breugel, Michael Dickinson, Jeffrey A Riffell, Adrienne Fairhall
Natural decision-making often involves extended decision sequences in response to variable stimuli with complex structure. As an example, many animals follow odor plumes to locate food sources or mates, but turbulence breaks up the advected odor signal into intermittent filaments and puffs. This scenario provides an opportunity to ask how animals use sparse, instantaneous, and stochastic signal encounters to generate goal-oriented behavioral sequences. Here we examined the trajectories of flying fruit flies (Drosophila melanogaster) and mosquitoes (Aedes aegypti) navigating in controlled plumes of attractive odorants...
February 12, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29431135/challenges-of-diagnosis-and-management-of-giant-cell-arteritis-in-general-practice-a-multimethods-study
#11
Toby Helliwell, Sara Muller, Samantha L Hider, James A Prior, Jane C Richardson, Christian D Mallen
BACKGROUND: In the UK, general practitioners (GPs) are usually the first medical contact for patients with suspected giant cell arteritis (GCA). While rare, it is critical not to miss, as delayed treatment can lead to significant complications including permanent visual loss. To date, little is known about the approach and challenges to diagnosis and management of GCA by GPs. OBJECTIVE: To investigate the diagnosis and management of patients with suspected GCA in UK general practice...
February 3, 2018: BMJ Open
https://www.readbyqxmd.com/read/29430166/riemannian-nonlinear-mixed-effects-models-analyzing-longitudinal-deformations-in-neuroimaging
#12
Hyunwoo J Kim, Nagesh Adluru, Heemanshu Suri, Baba C Vemuri, Sterling C Johnson, Vikas Singh
Statistical machine learning models that operate on manifold-valued data are being extensively studied in vision, motivated by applications in activity recognition, feature tracking and medical imaging. While non-parametric methods have been relatively well studied in the literature, efficient formulations for parametric models (which may offer benefits in small sample size regimes) have only emerged recently. So far, manifold-valued regression models (such as geodesic regression) are restricted to the analysis of cross-sectional data, i...
July 2017: Proceedings
https://www.readbyqxmd.com/read/29428067/passive-magnetic-based-localization-for-precise-untethered-medical-instrument-tracking
#13
Zhenglong Sun, Luc Maréchal, Shaohui Foong
BACKGROUND AND OBJECTIVE: Motion tracking and navigation systems are paramount for both safety and efficacy in a variety of surgical insertions, interventions and procedures. Among the state-of-art tracking technology, passive magnetic tracking using permanent magnets or passive magnetic sources for localization is an effective technology to provide untethered medical instrument tracking without cumbersome wires needed for signal or power transmission. Motivated by practical needs in two medical insertion procedures: Nasogastric intubation and Ventriculostomy, we propose a unified method based on passive magnetic-field localization, for enhanced efficacy and safety...
March 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29426814/exploring-the-specific-needs-of-persons-with-multiple-sclerosis-for-mhealth-solutions-for-physical-activity-mixed-methods-study
#14
Guido Giunti, Jan Kool, Octavio Rivera Romero, Enrique Dorronzoro Zubiete
BACKGROUND: Multiple sclerosis (MS) is one of the world's most common neurologic disorders, with symptoms such as fatigue, cognitive problems, and issues with mobility. Evidence suggests that physical activity (PA) helps people with MS reduce fatigue and improve quality of life. The use of mobile technologies for health has grown in recent years with little involvement from relevant stakeholders. User-centered design (UCD) is a design philosophy with the goal of creating solutions specific to the needs and tasks of the intended users...
February 9, 2018: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/29425170/multi-complementary-model-for-long-term-tracking
#15
Deng Zhang, Junchang Zhang, Chenyang Xia
In recent years, video target tracking algorithms have been widely used. However, many tracking algorithms do not achieve satisfactory performance, especially when dealing with problems such as object occlusions, background clutters, motion blur, low illumination color images, and sudden illumination changes in real scenes. In this paper, we incorporate an object model based on contour information into a Staple tracker that combines the correlation filter model and color model to greatly improve the tracking robustness...
February 9, 2018: Sensors
https://www.readbyqxmd.com/read/29415454/chromosome-evolution-in-marsupials
#16
REVIEW
Janine E Deakin
Marsupials typically possess very large, distinctive chromosomes that make them excellent subjects for cytogenetic analysis, and the high level of conservation makes it relatively easy to track chromosome evolution. There are two speciose marsupial families with contrasting rates of karyotypic evolution that could provide insight into the mechanisms driving genome reshuffling and speciation. The family Dasyuridae displays exceptional karyotype conservation with all karyotyped species possessing a 2n = 14 karyotype similar to that predicted for the ancestral marsupial...
February 6, 2018: Genes
https://www.readbyqxmd.com/read/29414685/the-small-intestine-converts-dietary-fructose-into-glucose-and-organic-acids
#17
Cholsoon Jang, Sheng Hui, Wenyun Lu, Alexis J Cowan, Raphael J Morscher, Gina Lee, Wei Liu, Gregory J Tesz, Morris J Birnbaum, Joshua D Rabinowitz
Excessive consumption of sweets is a risk factor for metabolic syndrome. A major chemical feature of sweets is fructose. Despite strong ties between fructose and disease, the metabolic fate of fructose in mammals remains incompletely understood. Here we use isotope tracing and mass spectrometry to track the fate of glucose and fructose carbons in vivo, finding that dietary fructose is cleared by the small intestine. Clearance requires the fructose-phosphorylating enzyme ketohexokinase. Low doses of fructose are ∼90% cleared by the intestine, with only trace fructose but extensive fructose-derived glucose, lactate, and glycerate found in the portal blood...
February 6, 2018: Cell Metabolism
https://www.readbyqxmd.com/read/29414435/3d-multi-scale-fcn-with-random-modality-voxel-dropout-learning-for-intervertebral-disc-localization-and-segmentation-from-multi-modality-mr-images
#18
Xiaomeng Li, Qi Dou, Hao Chen, Chi-Wing Fu, Xiaojuan Qi, Daniel L Belavý, Gabriele Armbrecht, Dieter Felsenberg, Guoyan Zheng, Pheng-Ann Heng
Intervertebral discs (IVDs) are small joints that lie between adjacent vertebrae. The localization and segmentation of IVDs are important for spine disease diagnosis and measurement quantification. However, manual annotation is time-consuming and error-prone with limited reproducibility, particularly for volumetric data. In this work, our goal is to develop an automatic and accurate method based on fully convolutional networks (FCN) for the localization and segmentation of IVDs from multi-modality 3D MR data...
February 1, 2018: Medical Image Analysis
https://www.readbyqxmd.com/read/29414170/changes-in-spectroscopic-signatures-in-soluble-microbial-products-of-activated-sludge-under-different-osmotic-stress-conditions
#19
Tahir Maqbool, Jinwoo Cho, Jin Hur
Spectroscopic techniques were used to examine the subtle changes in soluble microbial products (SMP) of batch activated sludge bioreactors working at different salinities (i.e., 0%, 1%, 3%, and 5% NaCl). The changes in different fluorescent constituent were tracked by excitation-emission matrix combined with parallel factor analysis (EEM-PARAFAC), and the sequential production was further identified by two-dimensional correlation spectroscopy (2D-COS). Greater enrichment of tryptophan-like component and large-sized biopolymer were found in SMP for higher saline bioreactors, suggesting the SMP sources from bound extracellular polymeric substances and excreted intercellular constituents...
January 31, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29413969/tracking-the-origin-development-and-differentiation-of-hematopoietic-stem-cells
#20
REVIEW
Priyanka R Dharampuriya, Giorgia Scapin, Colline Wong, K John Wagner, Jennifer L Cillis, Dhvanit I Shah
PURPOSE OF REVIEW: The hierarchical nature of the hematopoietic system provides an ideal model system to illustrate the features of lineage tracing. We have outlined the utility of lineage tracing methods in establishing the origin and development of hematopoietic cells. RECENT FINDINGS: Methods such as CRISPR/Cas9, Polylox barcoding, and single-cell RNA-sequencing have improved our understanding of hematopoiesis. SUMMARY: This review chronicles the fate of the hematopoietic cells emerging from the mesoderm that subsequently develops into the adult blood lineages...
February 1, 2018: Current Opinion in Cell Biology
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