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https://www.readbyqxmd.com/read/28102942/a-platform-independent-method-to-reduce-ct-truncation-artifacts-using-discriminative-dictionary-representations
#1
Yang Chen, Adam Budde, Ke Li, Yinsheng Li, Jiang Hsieh, Guang-Hong Chen
PURPOSE: When the scan field of view (SFOV) of a CT system is not large enough to enclose the entire cross-section of the patient, or the patient needs to be positioned partially outside the SFOV for certain clinical applications, truncation artifacts often appear in the reconstructed CT images. Many truncation artifact correction methods perform extrapolations of the truncated projection data based on certain a priori assumptions. The purpose of this work was to develop a novel CT truncation artifact reduction method that directly operates on DICOM images...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102342/neural-activity-in-the-dorsal-medial-superior-temporal-area-of-monkeys-represents-retinal-error-during-adaptive-motor-learning
#2
Aya Takemura, Tomoyo Ofuji, Kenichiro Miura, Kenji Kawano
To adapt to variable environments, humans regulate their behavior by modulating gains in sensory-to-motor processing. In this study, we measured a simple eye movement, the ocular following response (OFR), in monkeys to study the neuronal basis of adaptive motor learning in the visuomotor processing stream. The medial superior temporal (MST) area of the cerebral cortex is a critical site for contextual gain modulation of the OFR. However, the role of MST neurons in adaptive gain modulation of the OFR remains unknown...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102309/integration-of-visual-and-joint-information-to-enable-linear-reaching-motions
#3
Henry Eberle, Slawomir J Nasuto, Yoshikatsu Hayashi
A new dynamics-driven control law was developed for a robot arm, based on the feedback control law which uses the linear transformation directly from work space to joint space. This was validated using a simulation of a two-joint planar robot arm and an optimisation algorithm was used to find the optimum matrix to generate straight trajectories of the end-effector in the work space. We found that this linear matrix can be decomposed into the rotation matrix representing the orientation of the goal direction and the joint relation matrix (MJRM) representing the joint response to errors in the Cartesian work space...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101923/how-suboptimal-is-suboptimal-choice
#4
Jay E Hinnenkamp, Timothy A Shahan, Gregory J Madden
In a frequently used suboptimal-choice procedure pigeons choose between an alternative that delivers three food pellets with p = 1.0 and an alternative that delivers ten pellets with p = 0.2. Because pigeons reliably choose the probabilistic (suboptimal) alternative, the procedure has been proposed as a nonhuman analog of human gambling. The present experiments were conducted to evaluate two potential threats to the validity of this procedure. Experiments 1 and 2 evaluated if pigeons obtained food at a lower unit price (i...
January 2017: Journal of the Experimental Analysis of Behavior
https://www.readbyqxmd.com/read/28100912/cryptic-splice-activation-but-not-exon-skipping-is-observed-in-minigene-assays-of-dystrophin-c-9361-1g-a-mutation-identified-by-ngs
#5
Emma Tabe Eko Niba, Atsushi Nishida, Van Khanh Tran, Dung Chi Vu, Masaaki Matsumoto, Hiroyuki Awano, Tomoko Lee, Yasuhiro Takeshima, Hisahide Nishio, Masafumi Matsuo
Next-generation sequencing (NGS) discloses nucleotide changes in the genome. Mutations at splicing regulatory elements are expected to cause splicing errors, such as exon skipping, cryptic splice site activation, partial exon loss or intron retention. In dystrophinopathy patients, prediction of splicing outcomes is essential to determine the phenotype: either severe Duchenne or mild Becker muscular dystrophy, based on the reading frame rule. In a Vietnamese patient, NGS identified a c.9361+1G>A mutation in the dystrophin gene and an additional DNA variation of A>G at +117 bases in intron 64...
January 19, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28100725/genome-wide-association-study-identifies-mapt-locus-influencing-human-plasma-tau-levels
#6
Jason Chen, Jin-Tai Yu, Kevin Wojta, Hui-Fu Wang, Henrik Zetterberg, Kaj Blennow, Jennifer S Yokoyama, Michael W Weiner, Joel H Kramer, Howard Rosen, Bruce L Miller, Giovanni Coppola, Adam L Boxer
OBJECTIVE: To identify genetic loci associated with plasma tau concentrations in healthy elders and individuals with Alzheimer disease. METHODS: Four hundred sixty-three non-Hispanic white individuals exceeding quality control criteria were included from the Alzheimer's Disease Neuroimaging Initiative (ADNI-1) cohort. Association of plasma tau with genetic polymorphisms was performed with a linear regression model. Significant associations were validated in an independent replication cohort consisting of 431 healthy elders or individuals with mild cognitive impairment recruited from the University of California, San Francisco Memory and Aging Center...
January 18, 2017: Neurology
https://www.readbyqxmd.com/read/28100597/investigation-of-a-candida-guilliermondii-pseudo-outbreak-reveals-a-novel-source-of-laboratory-contamination
#7
James E Kirby, Westyn Branch-Elliman, Mary T LaSalvia, Lorinda Longhi, Matthew MacKechnie, Grigoriy Urman, Linda M Baldini, Fatima R Muriel, Bernadette Sullivan, David S Yassa, Howard S Gold, Trevor K Wagner, Daniel J Diekema, Sharon B Wright
Candida guilliermondii was isolated from sterile specimens with increasing frequency over a several-month period despite a paucity of clinical evidence suggesting true Candida infections. However, a healthcare-associated outbreak was strongly considered due to growth patterns in the microbiology laboratory more consistent with true infection than environmental contamination. Therefore, an extensive investigation was performed to identify its cause. With the exception of one case, patient clinical courses were not consistent with true invasive fungal infections...
January 18, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28099286/multicenter-study-validating-accuracy-of-a-continuous-respiratory-rate-measurement-derived-from-pulse-oximetry-a-comparison-with-capnography
#8
Sergio D Bergese, Michael L Mestek, Scott D Kelley, Robert McIntyre, Alberto A Uribe, Rakesh Sethi, James N Watson, Paul S Addison
BACKGROUND: Intermittent measurement of respiratory rate via observation is routine in many patient care settings. This approach has several inherent limitations that diminish the clinical utility of these measurements because it is intermittent, susceptible to human error, and requires clinical resources. As an alternative, a software application that derives continuous respiratory rate measurement from a standard pulse oximeter has been developed. We sought to determine the performance characteristics of this new technology by comparison with clinician-reviewed capnography waveforms in both healthy subjects and hospitalized patients in a low-acuity care setting...
January 17, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28098238/expression-of-the-novel-maternal-centrosome-assembly-factor-wdr8-is-required-for-vertebrate-embryonic-mitoses
#9
Daigo Inoue, Manuel Stemmer, Thomas Thumberger, Thomas Ruppert, Felix Bärenz, Joachim Wittbrodt, Oliver J Gruss
The assembly of the first centrosome occurs upon fertilisation when male centrioles recruit pericentriolar material (PCM) from the egg cytoplasm. The mechanisms underlying the proper assembly of centrosomes during early embryogenesis remain obscure. We identify Wdr8 as a novel maternally essential protein that is required for centrosome assembly during embryonic mitoses of medaka (Oryzias latipes). By CRISPR-Cas9-mediated knockout, maternal/zygotic Wdr8-null (m/zWdr8(-/-)) blastomeres exhibit severe defects in centrosome structure that lead to asymmetric division, multipolar mitotic spindles and chromosome alignment errors...
January 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28096868/comparisons-of-subthreshold-versus-full-posttraumatic-stress-disorder-distinguished-by-subjective-functional-impairment-among-train-drivers-a-population-based-nationwide-study-in-south-korea
#10
Ji Hyun Baek, Ji-Hae Kim, Bin-Na Kim, Seung Jin Park, Maurizio Fava, David Mischoulon, Dongsoo Lee, Hong Jin Jeon
OBJECTIVE: Subthreshold posttraumatic stress disorder (SPTSD), a condition that meets the full symptomatic criteria of posttraumatic stress disorder (PTSD) without subjective functional impairment, has yet to be fully investigated. In this study, we aimed to determine the prevalence and characteristics of SPTSD. METHODS: The web-based survey including psychiatric diagnosis and experience of human error was conducted in actively working train drivers in South Korea...
January 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28095035/validation-of-a-parametric-finite-element-human-femur-model
#11
Katelyn F Klein, Jingwen Hu, Matthew P Reed, Lawrence W Schneider, Jonathan D Rupp
Objective Finite element (FE) models with geometry and material properties that are parametric with subject descriptors, such as age and body shape/size, are being developed to incorporate population variability into crash simulations. However, the validation methods currently being used with these parametric models do not assess whether model predictions are reasonable in the space over which the model is intended to be used. This study presents a parametric model of the femur and applies a unique validation paradigm to this parametric femur model that characterizes whether model predictions reproduce experimentally observed trends...
January 17, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28094012/mammalian-mitochondria-and-aging-an-update
#12
REVIEW
Timo E S Kauppila, Johanna H K Kauppila, Nils-Göran Larsson
Mitochondria were first postulated to contribute to aging more than 40 years ago. During the following decades, multiple lines of evidence in model organisms and humans showed that impaired mitochondrial function can contribute to age-associated disease phenotypes and aging. However, in contrast to the original theory favoring oxidative damage as a cause for mtDNA mutations, there are now strong data arguing that most mammalian mtDNA mutations originate as replication errors made by the mtDNA polymerase. Currently, a substantial amount of mitochondrial research is focused on finding ways to either remove or counteract the effects of mtDNA mutations with the hope of extending the human health- and lifespan...
January 10, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28093294/strehler-mildvan-correlation-is-a-degenerate-manifold-of-gompertz-fit
#13
Andrei E Tarkhov, Leonid I Menshikov, Peter O Fedichev
Gompertz empirical law of mortality is often used in practical research to parametrize survival fraction as a function of age with the help of just two quantities: the Initial Mortality Rate (IMR) and the Gompertz exponent, inversely proportional to the Mortality Rate Doubling Time (MRDT). The IMR is often found to be inversely related to the Gompertz exponent, which is the dependence commonly referred to as Strehler-Mildvan (SM) correlation. In this paper, we address fundamental uncertainties of the Gompertz parameters inference from experimental Kaplan-Meier plots and show, that a least squares fit often leads to an ill-defined non-linear optimization problem, which is extremely sensitive to sampling errors and the smallest systematic demographic variations...
January 13, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28092618/evaluation-of-portable-blood-glucose-meters-using-canine-and-feline-pooled-blood-samples
#14
A Mori, H Oda, E Onozawa, S Shono, T Takahashi, S Yamashita, H Fujimoto, T Sako
This study evaluated the accuracy and reproducibility of a human portable blood glucose meter (PBGM) for canine and feline whole blood. Reference plasma glucose values (RPGV) were concurrently measured using glucose oxidation methods. Fifteen healthy dogs and 6 healthy cats were used for blood sampling. Blood glucose concentrations and hematocrits were adjusted using pooled blood samples for our targeted values. A positive correlation between the PBGM and RPGV was found for both dogs (y = 0.877, x = -24.38, r = 0...
December 1, 2016: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28092582/automatic-prediction-of-health-status-using-smartphone-derived-behaviour-profiles
#15
Daniel Kelly, Kevin Curran, Brian Caulfield
OBJECTIVE: Current methods of assessing the affect a patients' health has on their daily life are extremely limited. The aim of this work is to develop a sensor based approach to health status measurement in order to objectively measure health status. METHODS: Techniques to generate human behaviour profiles, derived from smartphone accelerometer and gyroscope sensors, are proposed. Experiments, using SVM regression models, are then conducted in order to evaluate the use of the proposed behaviour profiles as a predictor of health status...
January 9, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28092571/machine-learned-replacement-of-n-labels-for-basecalled-sequences-in-dna-barcoding
#16
Eddie Ma, Sujeevan Ratnasingham, Stefan Kremer
This study presents a machine learning method that increases the number of identified bases in Sanger Sequencing. The system post-processes a KB basecalled chromatogram. It selects a recoverable subset of N-labels in the KB-called chromatogram to replace with basecalls (A,C,G,T). An N-label correction is defined given an additional read of the same sequence, and a human finished sequence. Corrections are added to the dataset when an alignment determines the additional read and human agree on the identity of the N-label...
August 11, 2016: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28092200/the-challenges-surrounding-preclinical-testing-in-transcatheter-device-development-and-the-implications-on-the-clinic
#17
Ralf Holzer, Jake Goble, Ziyad Hijazi
Transcatheter devices have contributed significantly to the advances achieved in treating many cardiovascular conditions over the last few decades. Sophisticated and detailed preclinical testing is not only a regulatory requirement to support an investigational device exemption (IDE) application, but more crucially its success and accuracy is needed to safeguard patients during the subsequent clinical testing stages. Areas Covered: This article covers the regulatory background as well as specific considerations related to pre-clinical testing of transcatheter devices...
January 16, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28091803/a-study-of-hyperelastic-models-for-predicting-the-mechanical-behavior-of-extensor-apparatus
#18
Nahid Elyasi, Kimia Karimi Taheri, Keivan Narooei, Ali Karimi Taheri
In this research, the nonlinear elastic behavior of human extensor apparatus was investigated. To this goal, firstly the best material parameters of hyperelastic strain energy density functions consisting of the Mooney-Rivlin, Ogden, invariants, and general exponential models were derived for the simple tension experimental data. Due to the significance of stress response in other deformation modes of nonlinear models, the calculated parameters were used to study the pure shear and balance biaxial tension behavior of the extensor apparatus...
January 16, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28089602/particle-swarm-optimizer-for-weighting-factor-selection-in-intensity-modulated-radiation-therapy-optimization-algorithms
#19
Jie Yang, Pengcheng Zhang, Liyuan Zhang, Huazhong Shu, Baosheng Li, Zhiguo Gui
In inverse treatment planning of intensity-modulated radiation therapy (IMRT), the objective function is typically the sum of the weighted sub-scores, where the weights indicate the importance of the sub-scores. To obtain a high-quality treatment plan, the planner manually adjusts the objective weights using a trial-and-error procedure until an acceptable plan is reached. In this work, a new particle swarm optimization (PSO) method which can adjust the weighting factors automatically was investigated to overcome the requirement of manual adjustment, thereby reducing the workload of the human planner and contributing to the development of a fully automated planning process...
January 12, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28089485/perceptual-error-analysis-of-human-and-synthesized-voices
#20
Marina Englert, Glaucya Madazio, Ingrid Gielow, Jorge Lucero, Mara Behlau
OBJECTIVE/HYPOTHESIS: To assess the quality of synthesized voices through listeners' skills in discriminating human and synthesized voices. STUDY DESIGN: Prospective study. METHODS: Eighteen human voices with different types and degrees of deviation (roughness, breathiness, and strain, with three degrees of deviation: mild, moderate, and severe) were selected by three voice specialists. Synthesized samples with the same deviations of human voices were produced by the VoiceSim system...
January 12, 2017: Journal of Voice: Official Journal of the Voice Foundation
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