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Wavelet analysis

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https://www.readbyqxmd.com/read/27897244/neural-oscillations-in-the-temporal-pole-for-a-temporally-congruent-audio-visual-speech-detection-task
#1
Takefumi Ohki, Atsuko Gunji, Yuichi Takei, Hidetoshi Takahashi, Yuu Kaneko, Yosuke Kita, Naruhito Hironaga, Shozo Tobimatsu, Yoko Kamio, Takashi Hanakawa, Masumi Inagaki, Kazuo Hiraki
Though recent studies have elucidated the earliest mechanisms of processing in multisensory integration, our understanding of how multisensory integration of more sustained and complicated stimuli is implemented in higher-level association cortices is lacking. In this study, we used magnetoencephalography (MEG) to determine how neural oscillations alter local and global connectivity during multisensory integration processing. We acquired MEG data from 15 healthy volunteers performing an audio-visual speech matching task...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27893380/area-determination-of-diabetic-foot-ulcer-images-using-a-cascaded-two-stage-svm-based-classification
#2
Lei Wang, Peder Pedersen, Emmanuel Agu, Diane Strong, Bengisu Tulu
It is standard practice for clinicians and nurses to primarily assess patients' wounds via visual examination. This subjective method can be inaccurate in wound assessment and also represents a significant clinical workload. Hence, computer-based systems, especially implemented on mobile devices, can provide automatic, quantitative wound assessment and can thus be valuable for accurately monitoring wound healing status. Out of all wound assessment parameters, the measurement of the wound area is the most suitable for automated analysis...
November 23, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27889842/early-differential-diagnosis-of-the-severity-of-acute-pancreatitis
#3
Alexander Popov, Anna Ershova, Sergey Podtaev, Peter Frick, Nadezhda Zubareva
There is a great need for early verification of the severity of acute pancreatitis (AP). The early stage of pathogenesis of AP is characterized by endothelial dysfunction which could be determined by wavelet analysis of skin temperature (WAST) technique. The aim is to investigate whether the dysregulation of microvascular tone caused by endothelial dysfunction and detected by WAST can be a significant indicator in early differential diagnosis of AP severity. The WAST performed in the frequency range of 0.0095-0...
November 26, 2016: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/27887658/parameter-set-for-computer-assisted-texture-analysis-of-fetal-brain
#4
Hugues Gentillon, Ludomir Stefańczyk, Michał Strzelecki, Maria Respondek-Liberska
BACKGROUND: Magnetic resonance data were collected from a diverse population of gravid women to objectively compare the quality of 1.5-tesla (1.5 T) versus 3-T magnetic resonance imaging of the developing human brain. MaZda and B11 computational-visual cognition tools were used to process 2D images. We proposed a wavelet-based parameter and two novel histogram-based parameters for Fisher texture analysis in three-dimensional space. RESULTS: Wavenhl, focus index, and dispersion index revealed better quality for 3 T...
November 25, 2016: BMC Research Notes
https://www.readbyqxmd.com/read/27885999/peripheral-vasomotor-activity-assessment-using-a-continuous-wavelet-analysis-on-webcam-photoplethysmographic-signals
#5
F Bousefsaf, C Maaoui, A Pruski
BACKGROUND: Vasoconstriction and vasodilation phenomena reflect the relative changes in the vascular bed. They induce particular modifications in the pulse wave magnitude. Webcams correspond to remote sensors that can be employed to measure the pulse wave in order to compute the pulse frequency. OBJECTIVE: Record and analyze pulse wave signal with a low-cost webcam to extract the amplitude information and assess the vasomotor activity of the participant. METHODS: Photoplethysmographic signals obtained from a webcam are analyzed through a continuous wavelet transform...
November 25, 2016: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/27884662/integrity-of-central-nervous-function-in-diabetes-mellitus-assessed-by-resting-state-eeg-frequency-analysis-and-source-localization
#6
Jens B Frøkjær, Carina Graversen, Christina Brock, Ahmad Khodayari-Rostamabad, Søren S Olesen, Tine M Hansen, Eirik Søfteland, Magnus Simrén, Asbjørn M Drewes
Diabetes mellitus (DM) is associated with structural and functional changes of the central nervous system. We used electroencephalography (EEG) to assess resting state cortical activity and explored associations to relevant clinical features. Multichannel resting state EEG was recorded in 27 healthy controls and 24 patients with longstanding DM and signs of autonomic dysfunction. The power distribution based on wavelet analysis was summarized into frequency bands with corresponding topographic mapping. Source localization analysis was applied to explore the electrical cortical sources underlying the EEG...
November 6, 2016: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27872871/microscopic-medical-image-classification-framework-via-deep-learning-and-shearlet-transform
#7
Hadi Rezaeilouyeh, Ali Mollahosseini, Mohammad H Mahoor
Cancer is the second leading cause of death in US after cardiovascular disease. Image-based computer-aided diagnosis can assist physicians to efficiently diagnose cancers in early stages. Existing computer-aided algorithms use hand-crafted features such as wavelet coefficients, co-occurrence matrix features, and recently, histogram of shearlet coefficients for classification of cancerous tissues and cells in images. These hand-crafted features often lack generalizability since every cancerous tissue and cell has a specific texture, structure, and shape...
October 2016: Journal of Medical Imaging
https://www.readbyqxmd.com/read/27859905/multiple-region-directed-functional-connectivity-based-on-phase-delays
#8
Gadi Goelman, Rotem Dan
Network analysis is increasingly advancing the field of neuroimaging. Neural networks are generally constructed from pairwise interactions with an assumption of linear relations between them. Here, a high-order statistical framework to calculate directed functional connectivity among multiple regions, using wavelet analysis and spectral coherence has been presented. The mathematical expression for 4 regions was derived and used to characterize a quartet of regions as a linear, combined (nonlinear), or disconnected network...
November 16, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27847147/a-novel-single-parameter-approach-for-forecasting-algal-blooms
#9
Xi Xiao, Junyu He, Haomin Huang, Todd R Miller, George Christakos, Elke S Reichwaldt, Anas Ghadouani, Shengpan Lin, Xinhua Xu, Jiyan Shi
Harmful algal blooms frequently occur globally, and forecasting could constitute an essential proactive strategy for bloom control. To decrease the cost of aquatic environmental monitoring and increase the accuracy of bloom forecasting, a novel single-parameter approach combining wavelet analysis with artificial neural networks (WNN) was developed and verified based on daily online monitoring datasets of algal density in the Siling Reservoir, China and Lake Winnebago, U.S.A. Firstly, a detailed modeling process was illustrated using the forecasting of cyanobacterial cell density in the Chinese reservoir as an example...
October 31, 2016: Water Research
https://www.readbyqxmd.com/read/27836167/a-1-year-old-boy-with-long-pauses-caused-by-paroxysmal-atrioventricular-block-and-sinus-arrest-vagal-reflex-and-effect-of-pacing
#10
Sayaka Sakazaki, Satoshi Masutani, Yoichi Iwamoto, Yoshitaka Asano, Ai Miyamoto, Hirotaka Ishido, Masanori Tamura, Hideaki Senzaki
Paroxysmal atrioventricular block (PAVB) is rare in children. A 1-year-old boy presented with PAVB and sinus arrest that resulted in refractory life-threatening symptomatic long pauses. Continuous heart rate variability analysis with high time resolution (wavelet analysis) revealed an abrupt increase in parasympathetic activity just before a long pause, which indicated a vagal reflex. Although a pacemaker is not always effective because of a concomitant vasodepressive response in such cases, the complete stabilization after pacemaker implantation in this case supports the necessity and usefulness of pacemaker implantation in patients with reflex-induced highly symptomatic bradycardia...
October 18, 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/27834129/detection-of-dendritic-spines-using-wavelet-packet-entropy-and-fuzzy-support-vector-machine
#11
Shuihua Wang, Yang Li, Ying Shao, Carlo Cattani, Sidan Du
The morphology of dendritic spines is highly correlated with the neuron function. Therefore, it is of positive influence for the research of the dendritic spines. However, it is tired to manual labeling the spine types for statics analysis. In this work, we proposed an approach based on the combination of wavelet contour analysis for the backbone detection, wavelet packet entropy, and fuzzy support vector machine for the spine classification. The experiments show that this approach is promising. The average detection accuracy of "MushRoom" achieves 97...
November 11, 2016: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/27821959/preliminary-study-of-optimal-measurement-location-on-vibroarthrography-for-classification-of-patients-with-knee-osteoarthritis
#12
Susumu Ota, Akiko Ando, Yusuke Tozawa, Takuya Nakamura, Shogo Okamoto, Takenobu Sakai, Kazunori Hase
[Purpose] The aims of the present study were to investigate the most suitable location for vibroarthrography measurements of the knee joint to distinguish a healthy knee from knee osteoarthritis using Wavelet transform analysis. [Subjects and Methods] Participants were 16 healthy females and 17 females with severe knee osteoarthritis. Vibroarthrography signals were measured on the medial and lateral epicondyles, mid-patella, and tibia using stethoscopes with a microphone while subjects stood up from a seated position...
October 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27817130/rank-determination-of-mental-functions-by-1d-wavelets-and-partial-correlation
#13
Y Karaca, Z Aslan, C Cattani, D Galletta, Y Zhang
The main aim of this paper is to classify mental functions by the Wechsler Adult Intelligence Scale-Revised tests with a mixed method based on wavelets and partial correlation. The Wechsler Adult Intelligence Scale-Revised is a widely used test designed and applied for the classification of the adults cognitive skills in a comprehensive manner. In this paper, many different intellectual profiles have been taken into consideration to measure the relationship between the mental functioning and psychological disorder...
January 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/27815646/ipsilateral-alteration-of-resting-state-activity-suggests-that-cortical-dysfunction-contributes-to-the-pathogenesis-of-cluster-headache
#14
Péter Faragó, Nikoletta Szabó, Eszter Tóth, Bernadett Tuka, András Király, Gergő Csete, Árpád Párdutz, Délia Szok, János Tajti, Csaba Ertsey, László Vécsei, Zsigmond Tamás Kincses
The pathomechanism of cluster headache (CH) is not entirely understood, but central and peripheral components were suggested. A recent report showed that transcranial magnetic stimulation measured cortical excitability was increased in the hemisphere ipsilalteral to the pain. In the current study we set out to investigate the amplitude of resting brain fMRI activity to find signatures of the increased excitability. High resolution T1 weighted and resting state functional MRI images were acquired from seventeen patients with CH in pain free period and from twenty-six healthy volunteers...
November 4, 2016: Brain Topography
https://www.readbyqxmd.com/read/27811395/sparse-representation-based-ecg-signal-enhancement-and-qrs-detection
#15
Yichao Zhou, Xiyuan Hu, Zhenmin Tang, Andrew C Ahn
Electrocardiogram (ECG) signal enhancement and QRS complex detection is a critical preprocessing step for further heart disease analysis and diagnosis. In this paper, we propose a sparse representation-based ECG signal enhancement and QRS complex detection algorithm. Unlike traditional Fourier or wavelet transform-based methods, which use fixed bases, the proposed algorithm models the ECG signal as the superposition of a few inner structures plus additive random noise, where these structures (referred to here as atoms) can be learned from the input signal or a training set...
November 4, 2016: Physiological Measurement
https://www.readbyqxmd.com/read/27810980/wavelet-coherence-analysis-of-cerebral-oxygenation-signals-measured-by-near-infrared-spectroscopy-in-sailors-an-exploratory-experimental-study
#16
Lingguo Bu, Jianfeng Li, Fangyi Li, Heshan Liu, Zengyong Li
OBJECTIVE: The objective of this study was to assess the effects of long-term offshore work on cerebral oxygenation oscillations in sailors based on the wavelet phase coherence (WPCO) of near-infrared spectroscopy (NIRS) signals. METHODS: The fatigue severity scale (FSS) was first applied to assess the fatigue level of sailors and age-matched controls. Continuous recordings of NIRS signals were then obtained from the prefrontal lobes in 30 healthy sailors and 30 age-matched controls during the resting state...
November 3, 2016: BMJ Open
https://www.readbyqxmd.com/read/27802209/comparative-study-between-microvascular-tone-regulation-and-rheological-properties-of-blood-in-patients-with-type-2-diabetes-mellitus
#17
N Antonova, K Tsiberkin, S Podtaev, V Paskova, I Velcheva, N Chaushev
The aim of the study is to investigate the changes of the skin blood flow responses to cold stress in patients with diabetes mellitus type 2 through wavelet analysis of the peripheral skin temperature oscillations and to estimate their relationship with the blood viscosity values. The amplitudes of the skin temperature pulsations (ASTP) were monitored by "Microtest" device ("FM-Diagnostics", Russia); the whole blood viscosity and the shear stresses were measured by Contraves LS30 viscometer, (Switzerland) at a steady flow in 9 healthy subjects and in 30 patients with type 2 diabetes mellitus...
October 12, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27802028/deconstructing-demand-the-anthropogenic-and-climatic-drivers-of-urban-water-consumption
#18
Azadeh Hemati, Megan A Rippy, Stanley B Grant, Kristen Davis, David Feldman
Cities in drought prone regions of the world such as South East Australia are faced with escalating water scarcity and security challenges. Here we use 72 years of urban water consumption data from Melbourne, Australia, a city that recently overcame a 12 year "Millennium" drought, to evaluate 1) the relative importance of climatic and anthropogenic drivers of urban water demand (using wavelet-based approaches) and 2) the relative contribution of various water saving strategies to demand reduction during the Millennium Drought...
November 1, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27798720/electrically-evoked-medial-olivocochlear-efferent-effects-on-stimulus-frequency-otoacoustic-emissions-in-guinea-pigs
#19
Maria A Berezina-Greene, John J Guinan
Stimulus frequency otoacoustic emissions (SFOAEs) are produced by cochlear irregularities reflecting energy from the peak region of the traveling wave (TW). Activation of medial olivocochlear (MOC) efferents reduces cochlear amplification and otoacoustic emissions (OAEs). In other OAEs, MOC activation can produce enhancements. The extent of MOC enhancements of SFOAEs has not been previously studied. In anesthetized guinea pigs, we electrically stimulated MOC fibers and recorded their effects on SFOAEs. MOC stimulation mostly inhibited SFOAEs but sometimes enhanced them...
October 31, 2016: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/27794388/meteorological-influences-on-dengue-transmission-in-pakistan
#20
Suleman Atique, Shabbir Syed Abdul, Chien-Yeh Hsu, Ting-Wu Chuang
OBJECTIVE: To identify the influences of local and regional climate phenomena on dengue transmission in Lahore District of Pakistan, from 2006 to 2014. METHODS: Time-series models were applied to analyze associations between reported cases of dengue and climatic parameters. The coherence trend of regional climate phenomena (IOD and ENSO) was evaluated with wavelet analysis. RESULTS: The minimum temperature 4 months before the dengue outbreak played the most important role in the Lahore District (P = 0...
October 2016: Asian Pacific Journal of Tropical Medicine
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