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https://www.readbyqxmd.com/read/27910465/accelerated-reconstruction-of-electrical-impedance-tomography-images-via-patch-based-sparse-representation
#1
Qi Wang, Zhijie Lian, Jianming Wang, Qingliang Chen, Yukuan Sun, Xiuyan Li, Xiaojie Duan, Ziqiang Cui, Huaxiang Wang
Electrical impedance tomography (EIT) reconstruction is a nonlinear and ill-posed problem. Exact reconstruction of an EIT image inverts a high dimensional mathematical model to calculate the conductivity field, which causes significant problems regarding that the computational complexity will reduce the achievable frame rate, which is considered as a major advantage of EIT imaging. The single-step method, state estimation method, and projection method were always used to accelerate reconstruction process. The basic principle of these methods is to reduce computational complexity...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27900297/effects-of-lymphatic-drainage-and-local-cryo-exposition-regeneration-after-high-intensive-exercises
#2
Michael Behringer, Diana Jedlicka, Molly McCourt, Matthias Ring, Joachim Mester
BACKGROUND: Recovery from exercise and competition is important in sports medicine, particularly when rest periods are short. The objective is to determine the efficacy of cryo exposition (CRY) and manual lymphatic drainage (MLD) to hasten short term recovery of muscle performance after eccentric contractions. METHODS: In a randomized controlled trial, 30 healthy sport students (21 males, 9 females; age: 25.7±2.8 years) performed 4×20 eccentric contractions of knee extensors, followed by 30 min MLD, CRY, or rest (RST) under controlled laboratory environment...
April 2016: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/27897221/plasmonic-metalens-based-on-coupled-resonators-for-focusing-of-surface-plasmons
#3
Quan Xu, Xueqian Zhang, Yuehong Xu, Quan Li, Yanfeng Li, Chunmei Ouyang, Zhen Tian, Jianqiang Gu, Wentao Zhang, Xixiang Zhang, Jiaguang Han, Weili Zhang
As an essential functionality, flexible focusing of surface plasmons (SPs) is of particular interest in nonlinear optics and highly integrated plasmonic circuitry. Here, we developed a versatile plasmonic metalens, a metasurface comprised of coupled subwavelength resonators, whose optical responses exhibit a remarkable feature of electromagnetically induced transparency (EIT). We demonstrate numerically and experimentally how a proper spatial design of the unit elements steers SPs to arbitrary foci based on the holographic principles...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27897152/a-novel-multi-frequency-electrical-impedance-tomography-spectral-imaging-algorithm-for-early-stroke-detection
#4
Lin Yang, Canhua Xu, Meng Dai, Feng Fu, Xuetao Shi, Xiuzhen Dong
Multi-frequency electrical impedance tomography (MFEIT) reconstructs the image of conductivity inside the human body based on the dependence of tissue conductivity on frequency. As there exist differences in the conductivity over frequency between blood, ischemic cortical tissue and normal cortical tissue, MFEIT has potential application in the detection of acute stroke. However, because the conductivity distribution of the human head is highly inhomogeneous and the conductivities of normal head tissue and stroke lesion tissue both change with frequency, the anomaly and normal head tissues are often mixed together in the reconstructed image, which makes it difficult to discern the anomaly...
November 29, 2016: Physiological Measurement
https://www.readbyqxmd.com/read/27881405/effectiveness-of-individualised-lung-recruitment-strategies-at-birth-an-experimental-study-in-preterm-lambs
#5
David G Tingay, Anushi E Rajapaksa, Emanuela Zannin, Prue M Pereira-Fantini, Raffaele Dellacà, Elizabeth Perkins, Cornelis Elroy E Zonneveld, Andy Adler, Don Black, Inez Frerichs, Anna Lavizzari, Magdy Sourial, Bartłomiej Grychtol, Fabio Mosca, Peter G Davis
Respiratory transition at birth involves rapidly clearing fetal lung liquid and preventing efflux back into the lung whilst aeration is established. We have developed a sustained inflation (SIOPT) individualized to volume-response and a dynamic tidal positive end-expiratory pressure (open lung volume, OLV) strategy that both enhance this process. We aimed to compare the effect of each with a group managed with PEEP of 8 cmH2O and no recruitment manoeuvre (No-RM), on gas exchange, lung mechanics, spatiotemporal aeration and lung injury in 127±1d preterm lambs...
November 23, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27876558/prevalidation-trial-for-a-novel-in-vitro-eye-irritation-test-using-the-reconstructed-human-cornea-like-epithelial-model-mctt-hce%C3%A2
#6
Hyeri Yang, Da-Eun Kim, Won-Hee Jang, Susun An, Sun-A Cho, Mi-Sook Jung, Ji Eun Lee, Kyung-Wook Yeo, Sang Bum Koh, Tae-Cheon Jeong, Mi-Jeong Kang, Young-Jin Chun, Su-Hyon Lee, Kyung-Min Lim, SeungJin Bae
Here, we report the results of a prevalidation trial for an in vitro eye irritation test (EIT) using the reconstructed human cornea-like epithelium, MCTT HCE™. The optimal cutoff to determine irritation in the prediction model was established at 35% with the receiver operation characteristics(ROC) curve for 126 substances. Within-lab(WL) and between-lab(BL) reproducibility was tested for 20 reference substances by 3 participating laboratories. Viability data described by mean±SD or ±1/2 difference between duplicate wells, and scatter plots, demonstrated the WL/BL consistency...
November 19, 2016: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/27872600/optimal-experience-and-personal-growth-flow-and-the-consolidation-of-place-identity
#7
Marino Bonaiuto, Yanhui Mao, Scott Roberts, Anastasia Psalti, Silvia Ariccio, Uberta Ganucci Cancellieri, Mihaly Csikszentmihalyi
This study examined the relationship between flow experience and place identity, based on eudaimonistic identity theory (EIT) which prioritizes self-defining activities as important for an individual's identification of his/her goals, values, beliefs, and interests corresponding to one's own identity development or enhancement. This study focuses on place identity, the identity's features relating to a person's relation with her/his place. The study is also based on flow theory, according to which some salient features of an activity experience are important for happiness and well-being...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27871877/journal-allergy-clinical-immunology-perspective-clinical-potential-for-imaging-in-asthma-and-other-lung-disorders
#8
Emily M DeBoer, David R Spielberg, Alan S Brody
The ability of lung imaging to phenotype patients, determine prognosis, and to predict response to treatments is expanding in clinical and translational research. The purpose of this perspective is to describe current imaging modalities that may be useful clinical tools in asthma and other lung disorders and to explore some of the new developments in imaging modalities of the lung. These imaging modalities include chest radiography (CXR), computed tomography (CT), lung magnetic resonance imaging (MRI), electrical impedance tomography (EIT), bronchoscopy, and others...
November 18, 2016: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/27849549/signal-to-noise-ratio-analysis-of-a-phase-sensitive-voltmeter-for-electrical-impedance-tomography
#9
Ethan K Murphy, Mohammad Takhti, Joseph Skinner, Ryan J Halter, Kofi Odame
In this paper, thorough analysis along with mathematical derivations of the matched filter for a voltmeter used in electrical impedance tomography systems are presented. The effect of the random noise in the system prior to the matched filter, generated by other components, are considered. Employing the presented equations allow system/circuit designers to find the maximum tolerable noise prior to the matched filter that leads to the target signal-to-noise ratio (SNR) of the voltmeter, without having to over-design internal components...
November 10, 2016: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/27836147/effect-of-artificial-toothbrushing-and-water-storage-on-the-surface-roughness-and-micromechanical-properties-of-tooth-colored-cad-cam-materials
#10
Simon Flury, Elisabeth Diebold, Anne Peutzfeldt, Adrian Lussi
STATEMENT OF PROBLEM: Because of the different composition of resin-ceramic computer-aided design and computer-aided manufacturing (CAD-CAM) materials, their polishability and their micromechanical properties vary. Moreover, depending on the composition of the materials, their surface roughness and micromechanical properties are likely to change with time. PURPOSE: The purpose of this in vitro study was to investigate the effect of artificial toothbrushing and water storage on the surface roughness (Ra and Rz) and the micromechanical properties, surface hardness (Vickers [VHN]) and indentation modulus (EIT), of 5 different tooth-colored CAD-CAM materials when polished with 2 different polishing systems...
November 14, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27828502/electromagnetically-induced-transparency-like-effect-in-microring-bragg-gratings-based-coupling-resonant-system
#11
Zecen Zhang, Geok Ing Ng, Ting Hu, Haodong Qiu, Xin Guo, Mohamed Saïd Rouifed, Chongyang Liu, Hong Wang
An all-pass microring-Bragg gratings (APMR-BG) based coupling resonant system is proposed and experimentally demonstrated to generate electromagnetically induced transparency (EIT)-like transmission for the first time. The coupling between two light path ways in the micro-ring resonator and the Fabry-Pérot (F-P) resonator formed by two sections of Bragg gratings gives rise to the EIT-like spectrum. This system has the advantage of a small footprint consisting of only one microring resonator and one bus waveguide with Bragg gratings...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27824071/electromagnetically-induced-transparency-of-a-plasmonic-metamaterial-light-absorber-based-on-multilayered-metallic-nanoparticle-sheets
#12
Koichi Okamoto, Daisuke Tanaka, Ryo Degawa, Xinheng Li, Pangpang Wang, Sou Ryuzaki, Kaoru Tamada
In this study, we observed the peak splitting of absorption spectra for two-dimensional sheets of silver nanoparticles due to the electromagnetically induced transparency (EIT) effect. This unique optical phenomenon was observed for the multilayered nanosheets up to 20 layers on a metal substrate, while this phenomenon was not observed on a transparent substrate. The wavelength and intensities of the split peaks depend on the number of layers, and the experimental results were well reproduced by the calculation of the Transfer-Matrix method by employing the effective medium approximation...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27749881/frequency-agile-electromagnetically-induced-transparency-analogue-in-terahertz-metamaterials
#13
Quan Xu, Xiaoqiang Su, Chunmei Ouyang, Ningning Xu, Wei Cao, Yuping Zhang, Quan Li, Cong Hu, Jianqiang Gu, Zhen Tian, Abul K Azad, Jiaguang Han, Weili Zhang
Recently reported active metamaterial analogues of electromagnetically induced transparency (EIT) are promising in developing novel optical components, such as active slow light devices. However, most of the previous works have focused on manipulating the EIT resonance strength at a fixed characteristic frequency and, therefore, realized on-to-off switching responses. To further extend the functionalities of the EIT effect, here we present a frequency tunable EIT analogue in the terahertz regime by integrating photoactive silicon into the metamaterial unit cell...
October 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27689566/comparison-of-distribution-of-lung-aeration-measured-with-eit-and-ct-in-spontaneously-breathing-awake-patients1
#14
Oliver C Radke, Thomas Schneider, Anja Braune, Romain Pirracchio, Felix Fischer, Thea Koch
BACKGROUND: Both Electrical Impedance Tomography (EIT) and Computed Tomography (CT) allow the estimation of the lung area. We compared two algorithms for the detection of the lung area per quadrant from the EIT images with the lung areas derived from the CT images. METHODS: 39 outpatients who were scheduled for an elective CT scan of the thorax were included in the study. For each patient we recorded EIT images immediately before the CT scan. The lung area per quadrant was estimated from both CT and EIT data using two different algorithms for the EIT data...
September 28, 2016: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/27682815/electrical-impedance-tomography-during-mechanical-ventilation
#15
Brian K Walsh, Craig D Smallwood
Electrical impedance tomography (EIT) is a noninvasive, non-radiologic imaging modality that may be useful for the quantification of lung disorders and titration of mechanical ventilation. The principle of operation is based on changes in electrical conductivity that occur as a function of changes in lung volume during ventilation. EIT offers potentially important benefits over standard imaging modalities because the system is portable and non-radiologic and can be applied to patients for long periods of time...
October 2016: Respiratory Care
https://www.readbyqxmd.com/read/27677457/coherent-and-dynamic-beam-splitting-based-on-light-storage-in-cold-atoms
#16
Kwang-Kyoon Park, Tian-Ming Zhao, Jong-Chan Lee, Young-Tak Chough, Yoon-Ho Kim
We demonstrate a coherent and dynamic beam splitter based on light storage in cold atoms. An input weak laser pulse is first stored in a cold atom ensemble via electromagnetically-induced transparency (EIT). A set of counter-propagating control fields, applied at a later time, retrieves the stored pulse into two output spatial modes. The high visibility interference between the two output pulses clearly demonstrates that the beam splitting process is coherent. Furthermore, by manipulating the control lasers, it is possible to dynamically control the storage time, the power splitting ratio, the relative phase, and the optical frequencies of the output pulses...
September 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27639399/noninvasive-pulmonary-artery-pressure-monitoring-by-eit-a-model-based-feasibility-study
#17
Martin Proença, Fabian Braun, Josep Solà, Jean-Philippe Thiran, Mathieu Lemay
Current monitoring modalities for patients with pulmonary hypertension (PH) are limited to invasive solutions. A novel approach for the noninvasive and unsupervised monitoring of pulmonary artery pressure (PAP) in patients with PH was proposed and investigated. The approach was based on the use of electrical impedance tomography (EIT), a noninvasive and safe monitoring technique, and was tested through simulations on a realistic 4D bio-impedance model of the human thorax. Changes in PAP were induced in the model by simulating multiple types of hypertensive conditions...
September 17, 2016: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/27619316/a-spiky-pattern-in-the-course-of-electrical-thoracic-impedance-as-a-very-early-sign-of-a-developing-pneumothorax
#18
B Cambiaghi, O Moerer, N Kunze-Szikszay, T Mauri, A Just, J Dittmar, G Hahn
A pneumothorax (PTX) is a potentially lethal condition in high-risk intensive care patients. Electrical impedance tomography (EIT) has been proven to detect PTX at the bedside. A so far not described pattern in the course of thoracic impedance at an early state of PTX was observed in a pig model of ventilator-induced lung injury (VILI) used for a more extensive study. EIT was performed at a framerate of 50 Hz. Beginning of PTX at normal ventilation, manifestation of PTX at VILI ventilation (plateau pressure 42 cm H2 O) and final pleural drainage were documented...
September 12, 2016: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/27609932/pilot-testing-of-the-eit-4-bpsd-intervention
#19
Barbara Resnick, Ann Kolanowski, Kimberly Van Haitsma, Marie Boltz, Elizabeth Galik, Alice Bonner, Erin Vigne, Lauren Holtzman, Paula M Mulhall
Behavioral and psychological symptoms of dementia are common in nursing home residents, and the Centers for Medicare and Medicaid Services now require that nonpharmacological interventions be used as a first-line treatment. Few staff know how to implement these interventions. The purpose of this study was to pilot test an implementation strategy, Evidence Integration Triangle for Behavioral and Psychological Symptoms of Dementia (EIT-4-BPSD), which was developed to help staff integrate behavioral interventions into routine care...
November 2016: American Journal of Alzheimer's Disease and Other Dementias
https://www.readbyqxmd.com/read/27596161/chest-electrical-impedance-tomography-examination-data-analysis-terminology-clinical-use-and-recommendations-consensus-statement-of-the-translational-eit-development-study-group
#20
Inéz Frerichs, Marcelo B P Amato, Anton H van Kaam, David G Tingay, Zhanqi Zhao, Bartłomiej Grychtol, Marc Bodenstein, Hervé Gagnon, Stephan H Böhm, Eckhard Teschner, Ola Stenqvist, Tommaso Mauri, Vinicius Torsani, Luigi Camporota, Andreas Schibler, Gerhard K Wolf, Diederik Gommers, Steffen Leonhardt, Andy Adler
Electrical impedance tomography (EIT) has undergone 30 years of development. Functional chest examinations with this technology are considered clinically relevant, especially for monitoring regional lung ventilation in mechanically ventilated patients and for regional pulmonary function testing in patients with chronic lung diseases. As EIT becomes an established medical technology, it requires consensus examination, nomenclature, data analysis and interpretation schemes. Such consensus is needed to compare, understand and reproduce study findings from and among different research groups, to enable large clinical trials and, ultimately, routine clinical use...
September 5, 2016: Thorax
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