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Computational and Mathematical Methods in Medicine

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https://www.readbyqxmd.com/read/28321264/fast-parabola-detection-using-estimation-of-distribution-algorithms
#1
Jose de Jesus Guerrero-Turrubiates, Ivan Cruz-Aceves, Sergio Ledesma, Juan Manuel Sierra-Hernandez, Jonas Velasco, Juan Gabriel Avina-Cervantes, Maria Susana Avila-Garcia, Horacio Rostro-Gonzalez, Roberto Rojas-Laguna
This paper presents a new method based on Estimation of Distribution Algorithms (EDAs) to detect parabolic shapes in synthetic and medical images. The method computes a virtual parabola using three random boundary pixels to calculate the constant values of the generic parabola equation. The resulting parabola is evaluated by matching it with the parabolic shape in the input image by using the Hadamard product as fitness function. This proposed method is evaluated in terms of computational time and compared with two implementations of the generalized Hough transform and RANSAC method for parabola detection...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28316639/feature-extraction-and-classification-of-ehg-between-pregnancy-and-labour-group-using-hilbert-huang-transform-and-extreme-learning-machine
#2
Lili Chen, Yaru Hao
Preterm birth (PTB) is the leading cause of perinatal mortality and long-term morbidity, which results in significant health and economic problems. The early detection of PTB has great significance for its prevention. The electrohysterogram (EHG) related to uterine contraction is a noninvasive, real-time, and automatic novel technology which can be used to detect, diagnose, or predict PTB. This paper presents a method for feature extraction and classification of EHG between pregnancy and labour group, based on Hilbert-Huang transform (HHT) and extreme learning machine (ELM)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28316638/sentiment-analysis-on-tweets-about-diabetes-an-aspect-level-approach
#3
María Del Pilar Salas-Zárate, José Medina-Moreira, Katty Lagos-Ortiz, Harry Luna-Aveiga, Miguel Ángel Rodríguez-García, Rafael Valencia-García
In recent years, some methods of sentiment analysis have been developed for the health domain; however, the diabetes domain has not been explored yet. In addition, there is a lack of approaches that analyze the positive or negative orientation of each aspect contained in a document (a review, a piece of news, and a tweet, among others). Based on this understanding, we propose an aspect-level sentiment analysis method based on ontologies in the diabetes domain. The sentiment of the aspects is calculated by considering the words around the aspect which are obtained through N-gram methods (N-gram after, N-gram before, and N-gram around)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28316637/noise-attenuation-estimation-for-maximum-length-sequences-in-deconvolution-process-of-auditory-evoked-potentials
#4
Xian Peng, Yun'er Chen, Tao Wang, Lei Ding, Xiaodan Tan
The use of maximum length sequence (m-sequence) has been found beneficial for recovering both linear and nonlinear components at rapid stimulation. Since m-sequence is fully characterized by a primitive polynomial of different orders, the selection of polynomial order can be problematic in practice. Usually, the m-sequence is repetitively delivered in a looped fashion. Ensemble averaging is carried out as the first step and followed by the cross-correlation analysis to deconvolve linear/nonlinear responses...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28293274/optimally-repeatable-kinetic-model-variant-for-myocardial-blood-flow-measurements-with-82-rb-pet
#5
Adrian F Ocneanu, Robert A deKemp, Jennifer M Renaud, Andy Adler, Rob S B Beanlands, Ran Klein
Purpose. Myocardial blood flow (MBF) quantification with (82)Rb positron emission tomography (PET) is gaining clinical adoption, but improvements in precision are desired. This study aims to identify analysis variants producing the most repeatable MBF measures. Methods. 12 volunteers underwent same-day test-retest rest and dipyridamole stress imaging with dynamic (82)Rb PET, from which MBF was quantified using 1-tissue-compartment kinetic model variants: (1) blood-pool versus uptake region sampled input function (Blood/Uptake-ROI), (2) dual spillover correction (SOC-On/Off), (3) right blood correction (RBC-On/Off), (4) arterial blood transit delay (Delay-On/Off), and (5) distribution volume (DV) constraint (Global/Regional-DV)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28293273/mathematical-modelling-of-immune-parameters-in-the-evolution-of-severe-dengue
#6
M K Premaratne, S S N Perera, G N Malavige, Saroj Jayasinghe
Aims. Predicting the risk of severity at an early stage in an individual patient will be invaluable in preventing morbidity and mortality caused by dengue. We hypothesized that such predictions are possible by analyzing multiple parameters using mathematical modeling. Methodology. Data from 11 adult patients with dengue fever (DF) and 25 patients with dengue hemorrhagic fever (DHF) were analyzed. Multivariate statistical analysis was performed to study the characteristics and interactions of parameters using dengue NS1 antigen levels, dengue IgG antibody levels, platelet counts, and lymphocyte counts...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28286543/a-psychometric-tool-for-a-virtual-reality-rehabilitation-approach-for-dyslexia
#7
Elisa Pedroli, Patrizia Padula, Andrea Guala, Maria Teresa Meardi, Giuseppe Riva, Giovanni Albani
Dyslexia is a chronic problem that affects the life of subjects and often influences their life choices. The standard rehabilitation methods all use a classic paper and pencil training format but these exercises are boring and demanding for children who may have difficulty in completing the treatments. It is important to develop a new rehabilitation program that would help children in a funny and engaging way. A Wii-based game was developed to demonstrate that a short treatment with an action video game, rather than phonological or orthographic training, may improve the reading abilities in dyslexic children...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28280519/3d-kidney-segmentation-from-abdominal-images-using-spatial-appearance-models
#8
Fahmi Khalifa, Ahmed Soliman, Adel Elmaghraby, Georgy Gimel'farb, Ayman El-Baz
Kidney segmentation is an essential step in developing any noninvasive computer-assisted diagnostic system for renal function assessment. This paper introduces an automated framework for 3D kidney segmentation from dynamic computed tomography (CT) images that integrates discriminative features from the current and prior CT appearances into a random forest classification approach. To account for CT images' inhomogeneities, we employ discriminate features that are extracted from a higher-order spatial model and an adaptive shape model in addition to the first-order CT appearance...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28280518/modeling-the-parasitic-filariasis-spread-by-mosquito-in-periodic-environment
#9
Yan Cheng, Xiaoyun Wang, Qiuhui Pan, Mingfeng He
In this paper a mosquito-borne parasitic infection model in periodic environment is considered. Threshold parameter R0 is given by linear next infection operator, which determined the dynamic behaviors of system. We obtain that when R0 < 1, the disease-free periodic solution is globally asymptotically stable and when R0 > 1 by Poincaré map we obtain that disease is uniformly persistent. Numerical simulations support the results and sensitivity analysis shows effects of parameters on R0, which provided references to seek optimal measures to control the transmission of lymphatic filariasis...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28280517/mixed-total-variation-and-l-1-regularization-method-for-optical-tomography-based-on-radiative-transfer-equation
#10
Jinping Tang, Bo Han, Weimin Han, Bo Bi, Li Li
Optical tomography is an emerging and important molecular imaging modality. The aim of optical tomography is to reconstruct optical properties of human tissues. In this paper, we focus on reconstructing the absorption coefficient based on the radiative transfer equation (RTE). It is an ill-posed parameter identification problem. Regularization methods have been broadly applied to reconstruct the optical coefficients, such as the total variation (TV) regularization and the L(1) regularization. In order to better reconstruct the piecewise constant and sparse coefficient distributions, TV and L(1) norms are combined as the regularization...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28270858/complementary-keratoconus-indices-based-on-topographical-interpretation-of-biomechanical-waveform-parameters-a-supplement-to-established-keratoconus-indices
#11
Susanne Goebels, Timo Eppig, Stefan Wagenpfeil, Alan Cayless, Berthold Seitz, Achim Langenbucher
Purpose. To build new models with the Ocular Response Analyzer (ORA) waveform parameters to create new indices analogous to established topographic keratoconus indices. Method. Biomechanical, tomographic, and topographic measurements of 505 eyes from the Homburger Keratoconus Centre were included. Thirty-seven waveform parameters (WF) were derived from the biomechanical measurement with the ORA. Area under curve (ROC, receiver operating characteristic) was used to quantify the screening performance. A logistic regression analysis was used to create two new keratoconus prediction models based on these waveform parameters to resample the clinically established keratoconus indices from Pentacam and TMS-5...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28270857/automatic-lumen-segmentation-in-intravascular-optical-coherence-tomography-images-using-level-set
#12
Yihui Cao, Kang Cheng, Xianjing Qin, Qinye Yin, Jianan Li, Rui Zhu, Wei Zhao
Automatic lumen segmentation from intravascular optical coherence tomography (IVOCT) images is an important and fundamental work for diagnosis and treatment of coronary artery disease. However, it is a very challenging task due to irregular lumen caused by unstable plaque and bifurcation vessel, guide wire shadow, and blood artifacts. To address these problems, this paper presents a novel automatic level set based segmentation algorithm which is very competent for irregular lumen challenge. Before applying the level set model, a narrow image smooth filter is proposed to reduce the effect of artifacts and prevent the leakage of level set meanwhile...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28261320/retinal-image-denoising-via-bilateral-filter-with-a-spatial-kernel-of-optimally-oriented-line-spread-function
#13
Yunlong He, Yuanjie Zheng, Yanna Zhao, Yanju Ren, Jian Lian, James Gee
Filtering belongs to the most fundamental operations of retinal image processing and for which the value of the filtered image at a given location is a function of the values in a local window centered at this location. However, preserving thin retinal vessels during the filtering process is challenging due to vessels' small area and weak contrast compared to background, caused by the limited resolution of imaging and less blood flow in the vessel. In this paper, we present a novel retinal image denoising approach which is able to preserve the details of retinal vessels while effectively eliminating image noise...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28255332/development-of-a-patient-specific-finite-element-model-for-predicting-implant-failure-in-pelvic-ring-fracture-fixation
#14
Vickie Shim, Andreas Höch, Ronny Grunert, Steffen Peldschus, Jörg Böhme
Introduction. The main purpose of this study is to develop an efficient technique for generating FE models of pelvic ring fractures that is capable of predicting possible failure regions of osteosynthesis with acceptable accuracy. Methods. Patient-specific FE models of two patients with osteoporotic pelvic fractures were generated. A validated FE model of an uninjured pelvis from our previous study was used as a master model. Then, fracture morphologies and implant positions defined by a trauma surgeon in the preoperative CT were manually introduced as 3D splines to the master model...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28255331/detection-of-impaired-cerebral-autoregulation-using-selected-correlation-analysis-a-validation-study
#15
Martin A Proescholdt, Rupert Faltermeier, Sylvia Bele, Alexander Brawanski
Multimodal brain monitoring has been utilized to optimize treatment of patients with critical neurological diseases. However, the amount of data requires an integrative tool set to unmask pathological events in a timely fashion. Recently we have introduced a mathematical model allowing the simulation of pathophysiological conditions such as reduced intracranial compliance and impaired autoregulation. Utilizing a mathematical tool set called selected correlation analysis (sca), correlation patterns, which indicate impaired autoregulation, can be detected in patient data sets (scp)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28255330/comparison-of-different-features-and-classifiers-for-driver-fatigue-detection-based-on-a-single-eeg-channel
#16
Jianfeng Hu
Driver fatigue has become an important factor to traffic accidents worldwide, and effective detection of driver fatigue has major significance for public health. The purpose method employs entropy measures for feature extraction from a single electroencephalogram (EEG) channel. Four types of entropies measures, sample entropy (SE), fuzzy entropy (FE), approximate entropy (AE), and spectral entropy (PE), were deployed for the analysis of original EEG signal and compared by ten state-of-the-art classifiers. Results indicate that optimal performance of single channel is achieved using a combination of channel CP4, feature FE, and classifier Random Forest (RF)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28250804/predictive-behavior-of-a-computational-foot-ankle-model-through-artificial-neural-networks
#17
Ruchi D Chande, Rosalyn Hobson Hargraves, Norma Ortiz-Robinson, Jennifer S Wayne
Computational models are useful tools to study the biomechanics of human joints. Their predictive performance is heavily dependent on bony anatomy and soft tissue properties. Imaging data provides anatomical requirements while approximate tissue properties are implemented from literature data, when available. We sought to improve the predictive capability of a computational foot/ankle model by optimizing its ligament stiffness inputs using feedforward and radial basis function neural networks. While the former demonstrated better performance than the latter per mean square error, both networks provided reasonable stiffness predictions for implementation into the computational model...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28246543/an-enhanced-grey-wolf-optimization-based-feature-selection-wrapped-kernel-extreme-learning-machine-for-medical-diagnosis
#18
Qiang Li, Huiling Chen, Hui Huang, Xuehua Zhao, ZhenNao Cai, Changfei Tong, Wenbin Liu, Xin Tian
In this study, a new predictive framework is proposed by integrating an improved grey wolf optimization (IGWO) and kernel extreme learning machine (KELM), termed as IGWO-KELM, for medical diagnosis. The proposed IGWO feature selection approach is used for the purpose of finding the optimal feature subset for medical data. In the proposed approach, genetic algorithm (GA) was firstly adopted to generate the diversified initial positions, and then grey wolf optimization (GWO) was used to update the current positions of population in the discrete searching space, thus getting the optimal feature subset for the better classification purpose based on KELM...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28243314/are-health-videos-from-hospitals-health-organizations-and-active-users-available-to-health-consumers-an-analysis-of-diabetes-health-video-ranking-in-youtube
#19
Carlos Fernandez-Llatas, Vicente Traver, Jose-Enrique Borras-Morell, Antonio Martinez-Millana, Randi Karlsen
Health consumers are increasingly using the Internet to search for health information. The existence of overloaded, inaccurate, obsolete, or simply incorrect health information available on the Internet is a serious obstacle for finding relevant and good-quality data that actually helps patients. Search engines of multimedia Internet platforms are thought to help users to find relevant information according to their search. But, is the information recovered by those search engines from quality sources? Is the health information uploaded from reliable sources, such as hospitals and health organizations, easily available to patients? The availability of videos is directly related to the ranking position in YouTube search...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28243313/utilizing-selected-di-and-trinucleotides-of-sirna-to-predict-rnai-activity
#20
Ye Han, Yuanning Liu, Hao Zhang, Fei He, Chonghe Shu, Liyan Dong
Small interfering RNAs (siRNAs) induce posttranscriptional gene silencing in various organisms. siRNAs targeted to different positions of the same gene show different effectiveness; hence, predicting siRNA activity is a crucial step. In this paper, we developed and evaluated a powerful tool named "siRNApred" with a new mixed feature set to predict siRNA activity. To improve the prediction accuracy, we proposed 2-3NTs as our new features. A Random Forest siRNA activity prediction model was constructed using the feature set selected by our proposed Binary Search Feature Selection (BSFS) algorithm...
2017: Computational and Mathematical Methods in Medicine
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