82,123 results match your criteria good agreement

Dual-energy CT of the liver: True noncontrast vs. virtual noncontrast images derived from multiple phases for the diagnosis of fatty liver.

Eur J Radiol 2021 Apr 29;140:109741. Epub 2021 Apr 29.

Siemens Healthineers Ltd., 23 Chungjeong-ro, Seoul, 03737, Republic of Korea.

Purpose: To evaluate the difference in liver density and to compare the performance to diagnose fatty liver between true noncontrast (TNC) images and virtual noncontrast (VNC) images generated from dual-energy CT (DECT).

Materials And Methods: Patients who underwent liver dynamic DECT and MRI were included (n = 49). Two observers measured the liver and spleen densities on TNC images and three VNC images from the arterial, portal and delayed phases of DECT (VNCa, VNCp and VNCd, respectively). Read More

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Functional performance tests in interstitial lung disease: Impairment and measurement properties.

Respir Med 2021 Apr 28;184:106413. Epub 2021 Apr 28.

Laboratory of Research in Respiratory Physiotherapy (LFIP), Department of Physiotherapy, State University of Londrina, Londrina, Brazil; Department of Rehabilitation Sciences, University Pitágoras UNOPAR, Londrina, Brazil. Electronic address:

Background: There is limited information regarding impairment in functional performance tests and their measurement properties in ILD. The present study aimed to verify the impairment and measurement properties of functional performance tests in ILD.

Methods: ILD and healthy individuals underwent assessments of pulmonary function, peripheral muscle strength (handgrip force and maximum isometric contraction of quadriceps femoris - MIVCq) and exercise capacity (6-min walk test - 6MWT). Read More

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Effect of magnetic field on the motion of two rigid spheres embedded in porous media with slip surfaces.

Eur Phys J E Soft Matter 2021 May 15;44(5):68. Epub 2021 May 15.

Department of Mathematics, Faculty of Sciences, Princess Nourah bint Abdulrahman University, Riyadh, Kingdom of Saudi Arabia.

A semi-analytical study for the Stokes flow approximation caused by two solid spheres of different sizes with slip surfaces, immersed in a porous medium in the presence of a transverse magnetic field, is investigated. The two spheres are translating with different velocities along the line joining their centers. A general solution is developed from the superposition of the essential solutions in two spherical frameworks with origins located at the centers of the two spheres. Read More

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Accuracy of a flash glucose monitoring system in cats and determination of the time lag between blood glucose and interstitial glucose concentrations.

J Vet Intern Med 2021 May 15. Epub 2021 May 15.

Department of Veterinary Medicine and Epidemiology University of California Davis, Davis, California, USA.

Background: The FreeStyle Libre (Abbott Laboratories) is a flash glucose monitoring system (FGMS) that measures interstitial glucose concentration (IG). The system is factory-calibrated, easy to use, inexpensive, and could be useful for monitoring diabetic cats.

Objectives: To evaluate the analytical and clinical accuracy of the FGMS in cats and establish the lag-time between IG and blood glucose concentration (BG). Read More

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Accuracy of self-reported height, weight and BMI in a multiethnic Asian population.

Ann Acad Med Singap 2021 Apr;50(4):306-314

Research Division, Institute of Mental Health, Singapore.

Introduction: The study assessed whether self-reported height, weight and derived body mass index (BMI) can provide an accurate measure of anthropometric data in a multiethnic adult population in Singapore.

Methods: Standardised anthropometric measurements were compared against the self-reported values from 5,132 adult residents in a cross-sectional, epidemiological survey. Discrepancies in self-reports from measurements were examined by comparing overall mean differences. Read More

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Artificial intelligence for classifying uncertain images by humans in determining choroidal vascular running pattern and comparisons with automated classification between artificial intelligence.

PLoS One 2021 14;16(5):e0251553. Epub 2021 May 14.

Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.

Purpose: Abnormalities of the running pattern of choroidal vessel have been reported in eyes with pachychoroid diseases. However, it is difficult for clinicians to judge the running pattern with high reproducibility. Thus, the purpose of this study was to compare the degree of concordance of the running pattern of the choroidal vessels between that determined by artificial intelligence (AI) to that determined by experienced clinicians. Read More

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Water quality assessment of a river using deep learning Bi-LSTM methodology: forecasting and validation.

Environ Sci Pollut Res Int 2021 May 14. Epub 2021 May 14.

CSE, GGSIPU, AIACTR, Krishna Nagar Road Chacha Nahru Bal Chikitsalaya, Geeta Colony, Delhi, New Delhi, 110031, India.

Water is a prime necessity for the survival and sustenance of all living beings. Over the past few years, the water quality of rivers is adversely affected due to harmful wastes and pollutants. This ever-increasing water pollution is a big matter of concern as it deteriorating the water quality, making it unfit for any type of use. Read More

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Comparison of Cadmium Zinc Telluride ECG-gated SPECT equilibrium radionuclide angiocardiography to magnetic resonance imaging to measure right ventricular volumes and ejection fraction in patients with cardiomyopathy.

J Nucl Cardiol 2021 May 14. Epub 2021 May 14.

Department of Cardiology, University Hospital, Grenoble Alpes, France.

Aims: The objective of this study was to determine the accuracy of right ventricular function (RVF) assessed by Cadmium Zinc Telluride ECG-gated SPECT equilibrium radionuclide angiocardiography (CZT-ERNA).

Methods And Results: Twenty-one consecutive patients with cardiomyopathy (aged 54 ± 19 years; 62% male) were included. RV ejection fraction (EF) and volumes were analyzed by CZT-ERNA and compared with values obtained by cardiac magnetic resonance imaging (CMR). Read More

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Knowledge, Attitudes, and Beliefs Regarding the COVID-19 Pandemic Among Women in Kansas.

J Community Health 2021 May 14. Epub 2021 May 14.

Department of Obstetrics and Gynecology, The University of Kansas Medical Center, 3901 Rainbow Blvd., Kansas City, KS, 66160, USA.

The COVID-19 pandemic brought forward the challenge of dispersing accurate medical information to the public rapidly. Credible and non-credible sources may impact public reactions to the virus. The purpose of this study is to assess those reactions of women located in or near Kansas. Read More

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Scattering of light by ZnO nanorod arrays.

Opt Lett 2021 May;46(10):2360-2363

The optical properties of ZnO nanorod (NR) arrays were investigated by optical total transmittance (TT) and diffuse reflectance (DR) spectroscopy in the visible region. The NRs were grown electrochemically in a three-electrode cell over a glass/fluorine-doped tin oxide (FTO) substrate. The mean length, radius, and density of NR samples were characterized by scanning electron microscopy. Read More

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Modeling and Observation of Nonlinear Damping in Dissipation-Diluted Nanomechanical Resonators.

Phys Rev Lett 2021 Apr;126(17):174101

Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark and Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.

Dissipation dilution enables extremely low linear loss in stressed, high aspect ratio nanomechanical resonators, such as strings or membranes. Here, we report on the observation and theoretical modeling of nonlinear dissipation in such structures. We introduce an analytical model based on von Kármán theory, which can be numerically evaluated using finite-element models for arbitrary geometries. Read More

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Validation of the European Prospective Investigation into Cancer (EPIC) Food Frequency Questionnaire for use among Adults in Lebanon.

Public Health Nutr 2021 May 14:1-27. Epub 2021 May 14.

Department of Rehabilitation & Sport Sciences, Faculty of Health & Social Sciences, Bournemouth University, Bournemouth BH8 8AJ, UK; (K.K.); (F.T.).

Objective: To validate the EPIC food frequency questionnaire (FFQ) in Lebanon.

Design: Validation of the EPIC FFQ was done against three 24-hour recalls. Unadjusted and energy adjusted correlations, Bland Altman plots, and weighed kappa statistics were used to assess the agreement between the two methods. Read More

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Subjective Global Nutritional Assessment as a nutritional tool in childhood chronic liver disease.

Br J Nutr 2021 May 14:1-27. Epub 2021 May 14.

Department of Pediatric Hepatology.

Objective of the study was to assess subjective global nutritional assessment (SGNA) in children with chronic liver diseases (CLD). Children aged 3 months to 18 years with CLD were prospectively enrolled (January 2016 to October 2018). SGNA was performed as per validated proforma for children. Read More

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Reproducibility: Reliability and Agreement Parameters of the Revised Short McGill Pain Questionnaire Version-2 for use in Patients with Musculoskeletal Shoulder Pain.

Can J Pain 2020 Dec 30;4(4):45-46. Epub 2020 Dec 30.

Roth McFarlane Hand and Upper Limb Centre, St. Joseph's Hospital, London, Ontario, Canada.

: The Revised Short-Form McGill Pain Questionnaire Version-2 (SF-MPQ-2) is a multidimensional outcome measure designed to evaluate neuropathic and nonneuropathic pain. A recent systematic review found insufficient psychometric data with respect to musculoskeletal health conditions. : The aim of this study was to describe the reproducibility (reliability and agreement) and internal consistency of the SF-MPQ-2 for use among patients with musculoskeletal shoulder pain. Read More

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December 2020

A nomogram to predict survival in patients with acute-on-chronic hepatitis B liver failure after liver transplantation.

Ann Transl Med 2021 Apr;9(7):555

Department of Hepatic Surgery and Liver Transplantation Center, Organ Transplantation Institute, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China.

Background: Individualized prediction of survival after liver transplantation (LT) for patients with hepatitis B virus-related acute-on-chronic liver failure (HBV-ACLF) has not been well investigated. This study aimed to develop a prognostic nomogram for patients with HBV-ACLF undergoing LT.

Methods: The nomogram was derived from a retrospective study of 290 patients who underwent LT for HBV-ACLF at the Third Affiliated Hospital of Sun Yat-sen University between January 2012 and December 2017. Read More

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A prognostic nomogram for women with primary ovarian signet-ring cell carcinoma.

Ann Transl Med 2021 Apr;9(7):525

Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, The First Affiliated Hospital, Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, China.

Background: Primary ovarian signet-ring cell carcinoma (POSRCC) is a rare subtype of ovarian carcinoma that is characterized by abundant mucin accumulation. POSRCC is aggressive, and the prognostic factors associated with its clinical outcome remain poorly defined. This study aimed to elucidate the clinical characteristics and survival of patients with POSRCC, and to establish an effective prognostic nomogram and risk stratification model to predict the risks associated with patient outcomes. Read More

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Computational design of biopolymer aerogels and predictive modelling of their nanostructure and mechanical behaviour.

Sci Rep 2021 May 13;11(1):10198. Epub 2021 May 13.

Department of Aerogels and Aerogel Composites, Institute of Materials Research, German Aerospace Center, Linder Höhe, 51147, Cologne, Germany.

To address the challenge of reconstructing or designing the three-dimensional microstructure of nanoporous materials, we develop a computational approach by combining the random closed packing of polydisperse spheres together with the Laguerre-Voronoi tessellation. Open-porous cellular network structures that adhere to the real pore-size distributions of the nanoporous materials are generated. As an example, κ-carrageenan aerogels are considered. Read More

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3D modeling of a superconducting dynamo-type flux pump.

Sci Rep 2021 May 13;11(1):10296. Epub 2021 May 13.

Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava, Slovakia.

High temperature superconducting (HTS) dynamos are promising devices that can inject large DC currents into the winding of superconducting machines or magnets in a contactless way. Thanks to this, troublesome brushes in HTS machines or bulky currents leads with high thermal losses will be no longer required. The working mechanism of HTS dynamo has been controversial during the recent years and several explanations and models have been proposed to elucidate its performance. Read More

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Exact statistical solution for the hopping transport of trapped charge via finite Markov jump processes.

Sci Rep 2021 May 13;11(1):10163. Epub 2021 May 13.

Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation, 630090.

In this study, we developed a discrete theory of the charge transport in thin dielectric films by trapped electrons or holes, that is applicable both for the case of countable and a large number of traps. It was shown that Shockley-Read-Hall-like transport equations, which describe the 1D transport through dielectric layers, might incorrectly describe the charge flow through ultra-thin layers with a countable number of traps, taking into account the injection from and extraction to electrodes (contacts). A comparison with other theoretical models shows a good agreement. Read More

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International classification of external causes of injury: a study on its content coverage.

BMC Med Inform Decis Mak 2021 May 13;21(1):155. Epub 2021 May 13.

Medical Informatics Research Center, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Haftbagh Highway, Kerman, 7616911313, Iran.

Background: Injuries are a major health issue worldwide and their prevention requires access to accurate statistics in this regard. This can be achieved by classifying the collected data using the international classification systems. This study aimed at investigating the content coverage rate of the International Classification of External Causes of Injury (ICECI) regarding the external causes of injury in a hospital. Read More

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Compact multi-functional frequency-selective absorber based on customizable impedance films.

Opt Express 2021 May;29(10):14974-14984

Multi-functional metamaterial absorbers have attracted considerable attention for applications in the microwave frequency regime. In this paper, we report the design, fabrication, and characterization of frequency-selective absorbers, which exhibit substantial absorption property within a pre-defined frequency band, while at the same time behaving as a highly transparent screen in another targeted frequency band. The proposed designs consist of a symmetrically patterned indium tin oxide film acting as an absorbing layer, two dielectric substrates, and a cross-slot metal sheet frequency selective surface playing the role of a transmitting layer. Read More

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Theoretical analysis of surface-shape-induced decorrelation noise in multi-wavelength digital holography.

Opt Express 2021 May;29(10):14720-14735

This paper presents analytical modelling for describing the speckle noise decorrelation in phase data from two- or multiple-wavelength digital holography. A novel expression for the modulus of the coherence factor is proposed for the case of two-wavelength speckle decorrelation from imaging roughness and surface shape through an optical system. The expression permits us to estimate the speckle decorrelation phase noise in surface shape measurements. Read More

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Curved waveguides in silicon written by a shaped laser beam.

Opt Express 2021 May;29(10):14201-14207

We demonstrate, for the first time, the direct writing of curved optical waveguides in monocrystalline silicon with curve radii from 2 mm to 6 cm. The bending loss of the curved waveguides is measured and a good agreement with theoretical values is found. Raman spectroscopy measurements suggest the formation of inhomogeneous amorphous and polycrystalline phases in the laser-modified region. Read More

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Reconfigurable magnetic near-field distributions based on the coding metasurfaces in MHz band.

Opt Express 2021 Apr;29(9):13908-13924

Magnetic near-field control has attracted extensive attention and have a wide range of applications in filters, sensors, and energy-transfer devices. Coding metamaterial has the convenience of miniaturization and integration, which not only provides a bridge between physics and information science, but also exploits a whole new perspective for magnetic near-field control. In this work, we theoretically propose and experimentally verify that the coding metasurface can realize the reconfigurable magnetic near-field distributions. Read More

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Multifunctional ultrathin reflective metasurface via polarization-decoupled phase for arbitrary circularly or elliptically polarized waves.

Opt Express 2021 Apr;29(8):12736-12749

Metasurface offers a promising platform in the design of multifunctional devices owing to its unique ability for EMWs manipulation. However, wave-manipulation capabilities for metasurfaces face challenges in manipulating orthogonal EMWs with arbitrary circularly or elliptically polarized EMWs in the microwave region. Herein, single-layer reflective metasurfaces are proposed for independent manipulation of an arbitrary set of orthogonal circularly or elliptically polarized EMWs via polarization-decoupled phase. Read More

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Manipulation of dispersive waves emission via quadratic spectral phase.

Opt Express 2021 Apr;29(8):12723-12735

We investigate the process of dispersive waves (DWs) emitted from Gaussian pulse (GP) with an initial quadratic spectral phase (QSP). We show that the radiation of DWs is strongly affected by the QSP parameter. The conversion efficiency and resonant frequency of DWs are effectively enhanced and controlled by tuning the sign and magnitude of the initial QSP. Read More

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Chirality of exceptional points in bianisotropic metasurfaces.

Opt Express 2021 Apr;29(8):11582-11590

In optical systems, one kind of exceptional point (EP) is associated with the maximally unidirectional reflection. Here, we theoretically show that the intrinsic chirality of this kind of EP is only determined by the sign of the scattering rate difference, and that these EPs could only be on or within a fundamental scattering bound in an asymmetric resonant system. As a proof of our theoretical deviation, a bianisotropic metasurface is designed to exhibit an extreme EP with a definite chirality on the fundamental scattering bound. Read More

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A framework for modeling bioimpedance measurements of nonhomogeneous tissues: a theoretical and simulation study.

Physiol Meas 2021 May 13. Epub 2021 May 13.

Electrical and Computer Engineering, The University of Utah, 36 S Wasatch Drive, Salt Lake City, Utah, 84112-9057, UNITED STATES.

Objective: Bioimpedance technology is experiencing an increased use to assess health in a wide range of new consumer, research and clinical applications. However, the interaction between tissues producing bioimpedance data is often unclear.

Methods: This work provides a novel theoretical framework to model bioimpedance measurements of nonhomogeneous tissues. Read More

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The effect of musculoskeletal model scaling methods on ankle joint kinematics and muscle force prediction during gait for children with cerebral palsy and equinus gait.

Comput Biol Med 2021 May 5;134:104436. Epub 2021 May 5.

Department of Exercise Sciences, The University of Auckland, Auckland, New Zealand. Electronic address:

Clinical gait analysis incorporated with neuromusculoskeletal modelling could provide valuable information about joint movements and muscle functions during ambulation for children with cerebral palsy (CP). This study investigated how imposing pre-calculated joint angles during musculoskeletal model scaling influence the ankle joint angle and muscle force computation. Ten children with CP and equinus gait underwent clinical gait analysis. Read More

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Breast glandularity and mean glandular dose assessment using a deep learning framework: Virtual patients study.

Phys Med 2021 May 10;83:264-277. Epub 2021 May 10.

Institute of Physics "Gleb Wataghin", University of Campinas, Campinas, Brazil. Electronic address:

Purpose: Breast dosimetry in mammography is an important aspect of radioprotection since women are exposed periodically to ionizing radiation due to breast cancer screening programs. Mean glandular dose (MGD) is the standard quantity employed for the establishment of dose reference levels in retrospective population studies. However, MGD calculations requires breast glandularity estimation. Read More

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