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Computational and Mathematical Methods in Medicine

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https://www.readbyqxmd.com/read/27891172/vortex-analysis-of-intra-aneurismal-flow-in-cerebral-aneurysms
#1
Kevin Sunderland, Christopher Haferman, Gouthami Chintalapani, Jingfeng Jiang
This study aims to develop an alternative vortex analysis method by measuring structure ofIntracranial aneurysm (IA) flow vortexes across the cardiac cycle, to quantify temporal stability of aneurismal flow. Hemodynamics were modeled in "patient-specific" geometries, using computational fluid dynamics (CFD) simulations. Modified versions of known λ2 and Q-criterion methods identified vortex regions; then regions were segmented out using the classical marching cube algorithm. Temporal stability was measured by the degree of vortex overlap (DVO) at each step of a cardiac cycle against a cycle-averaged vortex and by the change in number of cores over the cycle...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27882075/in-silico-evaluation-of-the-potential-antiarrhythmic-effect-of-epigallocatechin-3-gallate-on-cardiac-channelopathies
#2
Maroua Boukhabza, Jaouad El Hilaly, Nourdine Attiya, Ahmed El-Haidani, Younes Filali-Zegzouti, Driss Mazouzi, Mohamed-Yassine Amarouch
Ion channels are transmembrane proteins that allow the passage of ions according to the direction of their electrochemical gradients. Mutations in more than 30 genes encoding ion channels have been associated with an increasingly wide range of inherited cardiac arrhythmias. In this line, ion channels become one of the most important molecular targets for several classes of drugs, including antiarrhythmics. Nevertheless, antiarrhythmic drugs are usually accompanied by some serious side effects. Thus, developing new approaches could offer added values to prevent and treat the episodes of arrhythmia...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27882074/survival-prediction-and-feature-selection-in-patients-with-breast-cancer-using-support-vector-regression
#3
Shahrbanoo Goli, Hossein Mahjub, Javad Faradmal, Hoda Mashayekhi, Ali-Reza Soltanian
The Support Vector Regression (SVR) model has been broadly used for response prediction. However, few researchers have used SVR for survival analysis. In this study, a new SVR model is proposed and SVR with different kernels and the traditional Cox model are trained. The models are compared based on different performance measures. We also select the best subset of features using three feature selection methods: combination of SVR and statistical tests, univariate feature selection based on concordance index, and recursive feature elimination...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27872655/novel-burst-suppression-segmentation-in-the-joint-time-frequency-domain-for-eeg-in-treatment-of-status-epilepticus
#4
Jaeyun Lee, Woo-Jin Song, Hyang Woon Lee, Hyun-Chool Shin
We developed a method to distinguish bursts and suppressions for EEG burst suppression from the treatments of status epilepticus, employing the joint time-frequency domain. We obtained the feature used in the proposed method from the joint use of the time and frequency domains, and we estimated the decision as to whether the measured EEG was a burst segment or suppression segment by the maximum likelihood estimation. We evaluated the performance of the proposed method in terms of its accordance with the visual scores and estimation of the burst suppression ratio...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27867419/combined-application-of-ultrasound-and-ct-increased-diagnostic-value-in-female-patients-with-pelvic-masses
#5
Yan Liu, Hui Zhang, Xiaoqian Li, Guiqin Qi
Purpose. The current study aimed to evaluate whether combined application of ultrasound and CT had increased Diagnostic Value in Female Patients with Pelvic Masses over either method alone. Patients and Methods. 240 female patients with pelvic masses were detected preoperatively with ultrasound and CT prior to surgery. The sensitivity, specificity, and accuracy of ultrasound, CT, and combined ultrasound/CT application were evaluated, respectively. Results. The sensitivity, specificity, and accuracy of ultrasound were 52...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27867418/crf-based-model-for-instrument-detection-and-pose-estimation-in-retinal-microsurgery
#6
Mohamed Alsheakhali, Abouzar Eslami, Hessam Roodaki, Nassir Navab
Detection of instrument tip in retinal microsurgery videos is extremely challenging due to rapid motion, illumination changes, the cluttered background, and the deformable shape of the instrument. For the same reason, frequent failures in tracking add the overhead of reinitialization of the tracking. In this work, a new method is proposed to localize not only the instrument center point but also its tips and orientation without the need of manual reinitialization. Our approach models the instrument as a Conditional Random Field (CRF) where each part of the instrument is detected separately...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27847544/effects-of-reynolds-and-womersley-numbers-on-the-hemodynamics-of-intracranial-aneurysms
#7
Hafez Asgharzadeh, Iman Borazjani
The effects of Reynolds and Womersley numbers on the hemodynamics of two simplified intracranial aneurysms (IAs), that is, sidewall and bifurcation IAs, and a patient-specific IA are investigated using computational fluid dynamics. For this purpose, we carried out three numerical experiments for each IA with various Reynolds (Re = 145.45 to 378.79) and Womersley (Wo = 7.4 to 9.96) numbers. Although the dominant flow feature, which is the vortex ring formation, is similar for all test cases here, the propagation of the vortex ring is controlled by both Re and Wo in both simplified IAs (bifurcation and sidewall) and the patient-specific IA...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27847543/exploring-deep-learning-and-transfer-learning-for-colonic-polyp-classification
#8
Eduardo Ribeiro, Andreas Uhl, Georg Wimmer, Michael Häfner
Recently, Deep Learning, especially through Convolutional Neural Networks (CNNs) has been widely used to enable the extraction of highly representative features. This is done among the network layers by filtering, selecting, and using these features in the last fully connected layers for pattern classification. However, CNN training for automated endoscopic image classification still provides a challenge due to the lack of large and publicly available annotated databases. In this work we explore Deep Learning for the automated classification of colonic polyps using different configurations for training CNNs from scratch (or full training) and distinct architectures of pretrained CNNs tested on 8-HD-endoscopic image databases acquired using different modalities...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27843486/efficient-regularized-regression-with-l0-penalty-for-variable-selection-and-network-construction
#9
Zhenqiu Liu, Gang Li
Variable selections for regression with high-dimensional big data have found many applications in bioinformatics and computational biology. One appealing approach is the L0 regularized regression which penalizes the number of nonzero features in the model directly. However, it is well known that L0 optimization is NP-hard and computationally challenging. In this paper, we propose efficient EM (L0EM) and dual L0EM (DL0EM) algorithms that directly approximate the L0 optimization problem. While L0EM is efficient with large sample size, DL0EM is efficient with high-dimensional (n ≪ m) data...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27843485/learning-latent-variable-gaussian-graphical-model-for-biomolecular-network-with-low-sample-complexity
#10
Yanbo Wang, Quan Liu, Bo Yuan
Learning a Gaussian graphical model with latent variables is ill posed when there is insufficient sample complexity, thus having to be appropriately regularized. A common choice is convex ℓ1 plus nuclear norm to regularize the searching process. However, the best estimator performance is not always achieved with these additive convex regularizations, especially when the sample complexity is low. In this paper, we consider a concave additive regularization which does not require the strong irrepresentable condition...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27840656/deformation-of-a-capsule-in-a-power-law-shear-flow
#11
Fang-Bao Tian
An immersed boundary-lattice Boltzmann method is developed for fluid-structure interactions involving non-Newtonian fluids (e.g., power-law fluid). In this method, the flexible structure (e.g., capsule) dynamics and the fluid dynamics are coupled by using the immersed boundary method. The incompressible viscous power-law fluid motion is obtained by solving the lattice Boltzmann equation. The non-Newtonian rheology is achieved by using a shear rate-dependant relaxation time in the lattice Boltzmann method. The non-Newtonian flow solver is then validated by considering a power-law flow in a straight channel which is one of the benchmark problems to validate an in-house solver...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27840655/admm-em-method-for-l1-norm-regularized-weighted-least-squares-pet-reconstruction
#12
Yueyang Teng, Hang Sun, Chen Guo, Yan Kang
The L1-norm regularization is usually used in positron emission tomography (PET) reconstruction to suppress noise artifacts while preserving edges. The alternating direction method of multipliers (ADMM) is proven to be effective for solving this problem. It sequentially updates the additional variables, image pixels, and Lagrangian multipliers. Difficulties lie in obtaining a nonnegative update of the image. And classic ADMM requires updating the image by greedy iteration to minimize the cost function, which is computationally expensive...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27829869/interaction-between-thalamus-and-hippocampus-in-termination-of-amygdala-kindled-seizures-in-mice
#13
Zhen Zhang, Jia-Jia Li, Qin-Chi Lu, Hai-Qing Gong, Pei-Ji Liang, Pu-Ming Zhang
The thalamus and hippocampus have been found both involved in the initiation, propagation, and termination of temporal lobe epilepsy. However, the interaction of these regions during seizures is not clear. The present study is to explore whether some regular patterns exist in their interaction during the termination of seizures. Multichannel in vivo recording techniques were used to record the neural activities from the cornu ammonis 1 (CA1) of hippocampus and mediodorsal thalamus (MDT) in mice. The mice were kindled by electrically stimulating basolateral amygdala neurons, and Racine's rank standard was employed to classify the stage of behavioral responses (stage 1~5)...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27829868/corrigendum-to-solution-of-radiative-transfer-equation-with-a-continuous-and-stochastic-varying-refractive-index-by-legendre-transform-method
#14
R Baazaoui, M Gantri
[This corrects the article DOI: 10.1155/2014/814929.].
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27818706/random-survival-forests-for-predicting-the-bed-occupancy-in-the-intensive-care-unit
#15
Joeri Ruyssinck, Joachim van der Herten, Rein Houthooft, Femke Ongenae, Ivo Couckuyt, Bram Gadeyne, Kirsten Colpaert, Johan Decruyenaere, Filip De Turck, Tom Dhaene
Predicting the bed occupancy of an intensive care unit (ICU) is a daunting task. The uncertainty associated with the prognosis of critically ill patients and the random arrival of new patients can lead to capacity problems and the need for reactive measures. In this paper, we work towards a predictive model based on Random Survival Forests which can assist physicians in estimating the bed occupancy. As input data, we make use of the Sequential Organ Failure Assessment (SOFA) score collected and calculated from 4098 patients at two ICU units of Ghent University Hospital over a time period of four years...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27803729/changes-in-obesity-odds-ratio-among-iranian-adults-since-2000-quadratic-inference-functions-method
#16
Enayatollah Bakhshi, Koorosh Etemad, Behjat Seifi, Kazem Mohammad, Akbar Biglarian, Jalil Koohpayehzadeh
Background. Monitoring changes in obesity prevalence by risk factors is relevant to public health programs that focus on reducing or preventing obesity. The purpose of this paper was to study trends in obesity odds ratios (ORs) for individuals aged 20 years and older in Iran by using a new statistical methodology. Methods. Data collected by the National Surveys in Iran, from 2000 through 2011. Since responses of the member of each cluster are correlated, the quadratic inference functions (QIF) method was used to model the relationship between the odds of obesity and risk factors...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27800011/active-contours-using-additive-local-and-global-intensity-fitting-models-for-intensity-inhomogeneous-image-segmentation
#17
Shafiullah Soomro, Farhan Akram, Jeong Heon Kim, Toufique Ahmed Soomro, Kwang Nam Choi
This paper introduces an improved region based active contour method with a level set formulation. The proposed energy functional integrates both local and global intensity fitting terms in an additive formulation. Local intensity fitting term influences local force to pull the contour and confine it to object boundaries. In turn, the global intensity fitting term drives the movement of contour at a distance from the object boundaries. The global intensity term is based on the global division algorithm, which can better capture intensity information of an image than Chan-Vese (CV) model...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27774111/compatibility-and-conjugacy-on-partial-arrays
#18
S Vijayachitra, K Sasikala
Research in combinatorics on words goes back a century. Berstel and Boasson introduced the partial words in the context of gene comparison. Alignment of two genes can be viewed as a construction of two partial words that are said to be compatible. In this paper, we examine to which extent the fundamental properties of partial words such as compatbility and conjugacy remain true for partial arrays. This paper studies a relaxation of the compatibility relation called k-compability. It also studies k-conjugacy of partial arrays...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27752278/novel-use-of-natural-language-processing-nlp-to-predict-suicidal-ideation-and-psychiatric-symptoms-in-a-text-based-mental-health-intervention-in-madrid
#19
Benjamin L Cook, Ana M Progovac, Pei Chen, Brian Mullin, Sherry Hou, Enrique Baca-Garcia
Natural language processing (NLP) and machine learning were used to predict suicidal ideation and heightened psychiatric symptoms among adults recently discharged from psychiatric inpatient or emergency room settings in Madrid, Spain. Participants responded to structured mental and physical health instruments at multiple follow-up points. Outcome variables of interest were suicidal ideation and psychiatric symptoms (GHQ-12). Predictor variables included structured items (e.g., relating to sleep and well-being) and responses to one unstructured question, "how do you feel today?" We compared NLP-based models using the unstructured question with logistic regression prediction models using structured data...
2016: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/27752277/age-related-evolution-patterns-in-online-handwriting
#20
Gabriel Marzinotto, José C Rosales, Mounîm A El-Yacoubi, Sonia Garcia-Salicetti, Christian Kahindo, Hélène Kerhervé, Victoria Cristancho-Lacroix, Anne-Sophie Rigaud
Characterizing age from handwriting (HW) has important applications, as it is key to distinguishing normal HW evolution with age from abnormal HW change, potentially triggered by neurodegenerative decline. We propose, in this work, an original approach for online HW style characterization based on a two-level clustering scheme. The first level generates writer-independent word clusters from raw spatial-dynamic HW information. At the second level, each writer's words are converted into a Bag of Prototype Words that is augmented by an interword stability measure...
2016: Computational and Mathematical Methods in Medicine
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