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https://www.readbyqxmd.com/read/28922361/impact-of-four-different-recumbencies-on-the-distribution-of-ventilation-in-conscious-or-anaesthetized-spontaneously-breathing-beagle-dogs-an-electrical-impedance-tomography-study
#1
Tamas D Ambrisko, Johannes P Schramel, Ulrike Auer, Yves P S Moens
The aim was to examine the effects of recumbency and anaesthesia on distribution of ventilation in beagle dogs using Electrical Impedance Tomography (EIT). Nine healthy beagle dogs, aging 3.7±1.7 (mean±SD) years and weighing 16.3±1.6 kg, received a series of treatments in a fixed order on a single occasion. Conscious dogs were positioned in right lateral recumbency (RLR) and equipped with 32 EIT electrodes around the thorax. Following five minutes of equilibration, two minutes of EIT recordings were made in each recumbency in the following order: RLR, dorsal (DR), left (LLR) and sternal (SR)...
2017: PloS One
https://www.readbyqxmd.com/read/28900248/high-extinction-ratio-electromagnetically-induced-transparency-analogue-based-on-the-radiation-suppression-of-dark-modes
#2
JingYa Xie, Xi Zhu, XiaoFei Zang, QingQing Cheng, YangYang Ye, YiMing Zhu
A high extinction ratio (ER) electromagnetically induced transparency (EIT) analogue based on single-layer metamaterial is designed and experimentally demonstrated in this paper. This design involves four mirror-like symmetrically coupled split ring resonators (SRRs) that exhibit a bright-dark-dark-bright mode configuration. The EIT-like effect is realized by coupling between the bright resonators and dark resonators. The high ER feature is achieved from the suppression of radiative losses, due to opposite directions of electric and magnetic dipoles of two dark modes in the unit cell...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878374/above-threshold-scattering-about-a-feshbach-resonance-for-ultracold-atoms-in-an-optical-collider
#3
Milena S J Horvath, Ryan Thomas, Eite Tiesinga, Amita B Deb, Niels Kjærgaard
Ultracold atomic gases have realized numerous paradigms of condensed matter physics, where control over interactions has crucially been afforded by tunable Feshbach resonances. So far, the characterization of these Feshbach resonances has almost exclusively relied on experiments in the threshold regime near zero energy. Here, we use a laser-based collider to probe a narrow magnetic Feshbach resonance of rubidium above threshold. By measuring the overall atomic loss from colliding clouds as a function of magnetic field, we track the energy-dependent resonance position...
September 6, 2017: Nature Communications
https://www.readbyqxmd.com/read/28869620/the-influence-of-the-cumulated-deformation-energy-in-the-measurement-by-the-dsi-method-on-the-selected-mechanical-properties-of-bone-tissues
#4
Anna M Makuch, Konstanty R Skalski, Marek Pawlikowski
PURPOSE: The goal of the study was to determine the influence of DSI test conditions, i.e., loading/unloading rates, hold time, and the value of the maximum loading force on selected mechanical properties of trabecular bone tissue. METHODS: The test samples were resected from a femoral head of a patient qualified for a hip replacement surgery. During the DSI tests hardness (HV, HM, HIT) and elastic modulus (EIT) of trabecular bone tissue were measured using the Micro Hardness Tester (MHT, CSEM)...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28858252/a-quantitative-evaluation-of-drive-pattern-selection-for-optimizing-eit-based-stretchable-sensors
#5
Stefania Russo, Samia Nefti-Meziani, Nicola Carbonaro, Alessandro Tognetti
Electrical Impedance Tomography (EIT) is a medical imaging technique that has been recently used to realize stretchable pressure sensors. In this method, voltage measurements are taken at electrodes placed at the boundary of the sensor and are used to reconstruct an image of the applied touch pressure points. The drawback with EIT-based sensors, however, is their low spatial resolution due to the ill-posed nature of the EIT reconstruction. In this paper, we show our performance evaluation of different EIT drive patterns, specifically strategies for electrode selection when performing current injection and voltage measurements...
August 31, 2017: Sensors
https://www.readbyqxmd.com/read/28852012/enhanced-spectral-profile-in-the-study-of-doppler-broadened-rydberg-ensembles
#6
Bo-Han Wu, Ya-Wen Chuang, Yi-Hsin Chen, Jr-Chiun Yu, Ming-Shien Chang, Ite A Yu
Combination of the electromagnetically-induced-transparency (EIT) effect and Rydberg-state atoms has attracted great attention recently due to its potential application in the photon-photon interaction or qubit operation. In this work, we studied the Rydberg-EIT spectra with room-temperature (87)Rb atoms. Spectroscopic data under various experimental parameters all showed that the contrast of EIT transparency as a function of the probe field intensity is initially enhanced, reaches a maximum value and then decays gradually...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28832898/spontaneous-breathing-trials-after-prolonged-mechanical-ventilation-monitored-by-electrical-impedance-tomography-an-observational-study
#7
Z Zhao, S-Y Peng, M-Y Chang, Y-L Hsu, I Frerichs, H-T Chang, K Möller
BACKGROUND: The study objective was to examine the correlation between regional ventilation distribution measured with electrical impedance tomography (EIT) and weaning outcomes during spontaneous breathing trial (SBT). METHODS: Fifteen patients received 100% automatic tube compensation (ATC) during the first and 70% during the second hour. Another 15 patients received external continuous positive airway pressure (CPAP) of 5 and 7.5 cmH2 O during the first and second hours, respectively...
August 17, 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/28828369/lung-imaging-how-to-get-better-look-inside-the-lung
#8
REVIEW
Lorenzo Ball, Veronica Vercesi, Federico Costantino, Karthikka Chandrapatham, Paolo Pelosi
In the last years, imaging has played a key role in the diagnosis and monitoring and critical illness, including acute respiratory distress syndrome (ARDS). Chest X-ray (CXR) and computed tomography (CT) are the conventional techniques most performed in the critically ill patients, the latter being the gold standard to assess lung aeration in ARDS patients. In addition, two bedside techniques are now gaining popularity alongside the conventional ones: lung ultrasound (LUS) and electrical impedance tomography (EIT)...
July 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28828172/optical-quantum-memory-based-on-electromagnetically-induced-transparency
#9
Lijun Ma, Oliver Slattery, Xiao Tang
Electromagnetically induced transparency (EIT) is a promising approach to implement quantum memory in quantum communication and quantum computing applications. In this paper, following a brief overview of the main approaches to quantum memory, we provide details of the physical principle and theory of quantum memory based specifically on EIT. We discuss the key technologies for implementing quantum memory based on EIT and review important milestones, from the first experimental demonstration to current applications in quantum information systems...
April 2017: Journal of Optics
https://www.readbyqxmd.com/read/28803440/electrical-impedance-tomography-for-diagnosis-and-monitoring-of-pulmonary-function-disorders-in-the-intensive-care-unit-case-report-and-review-of-literature
#10
Szymon Białka, Maja Copik, Katarzyna Rybczyk, Hanna Misiołek
The aim of this paper is to describe the possibility of using Electrical Impedance Tomography (EIT) as a treatment monitoring tool in the ICU. It was based on case report and literature review. A 19-year-old female was admitted to ICU due to severe acute respiratory distress syndrome. Despite aggressive treatment there was no improvement. We decided to use EIT in the monitoring of treatment because of difficulties in transporting the patient to the radiology department in order to perform a control CT scan...
2017: Anaesthesiology Intensive Therapy
https://www.readbyqxmd.com/read/28799869/predictive-factors-of-medullary-infarction-after-endovascular-internal-trapping-using-coils-for-vertebral-artery-dissecting-aneurysms
#11
Masanori Aihara, Isao Naito, Tatsuya Shimizu, Masahiro Matsumoto, Ken Asakura, Naoko Miyamoto, Yuhei Yoshimoto
OBJECTIVE The first choice of treatment in cases of vertebral artery dissecting aneurysms (VADAs) is endovascular internal trapping (EIT) of the dissecting segment using coils. However, this procedure carries the risk of medullary infarction, and the risk factors for this complication are not well understood. This study investigated the risk factors causing medullary infarction. METHODS One hundred patients who underwent EIT for VADAs were included in this study. Ninety-three patients presented with subarachnoid hemorrhage...
August 11, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28792615/emotion-processing-in-female-youth-testing-the-stability-of-the-late-positive-potential
#12
Erin Bondy, Jeremy G Stewart, Greg Hajcak, Anna Weinberg, Naomi Tarlow, Vijay A Mittal, Randy P Auerbach
The Emotional Interrupt Task (EIT) has been used to probe emotion processing in healthy and clinical samples; however, research exploring the stability and reliability of behavioral measures and ERPs elicited from this task is limited. Establishing the psychometric properties of the EIT is critical, particularly as phenotypes and biological indicators may represent traitlike characteristics that underlie psychiatric illness. To address this gap, test-retest stability and internal consistency of behavioral indices and ERPs resulting from the EIT in healthy, female youth (n = 28) were examined...
August 9, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28769088/influence-of-the-asymmetric-excited-state-decay-on-coherent-population-trapping
#13
H S Borges, M H Oliveira, C J Villas-Boas
Electromagnetically induced transparency (EIT) is an optical phenomenon which allows a drastic modification of the optical properties of an atomic system by applying a control field. It has been largely studied in the last decades and nowadays we can find a huge number of experimental and theoretical related studies. Recently a similar phenomenon was also shown in quantum dot molecules (QDM), where the control field is replaced by the tunneling rate between quantum dots. Our results show that in the EIT regime, the optical properties of QDM and the atomic system are identical...
August 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28763474/effects-of-individualized-electrical-impedance-tomography-and-image-reconstruction-settings-upon-the-assessment-of-regional-ventilation-distribution-comparison-to-4-dimensional-computed-tomography-in-a-porcine-model
#14
Florian Thürk, Stefan Boehme, Daniel Mudrak, Stefan Kampusch, Alice Wielandner, Helmut Prosch, Christina Braun, Frédéric P R Toemboel, Johannes Hofmanninger, Eugenijus Kaniusas
Electrical impedance tomography (EIT) is a promising imaging technique for bedside monitoring of lung function. It is easily applicable, cheap and requires no ionizing radiation, but clinical interpretation of EIT-images is still not standardized. One of the reasons for this is the ill-posed nature of EIT, allowing a range of possible images to be produced-rather than a single explicit solution. Thus, to further advance the EIT technology for clinical application, thorough examinations of EIT-image reconstruction settings-i...
2017: PloS One
https://www.readbyqxmd.com/read/28742775/estimation-of-stroke-volume-and-stroke-volume-changes-by-electrical-impedance-tomography
#15
Fernando José da Silva Ramos, André Hovnanian, Rogério Souza, Luciano C P Azevedo, Marcelo B P Amato, Eduardo L V Costa
BACKGROUND: Electrical impedance tomography (EIT) is a noninvasive imaging method that identifies changes in air and blood volume based on thoracic impedance changes. Recently, there has been growing interest in EIT to measure stroke volume (SV). The objectives of this study are as follows: (1) to evaluate the ability of systolic impedance variations (ΔZsys) to track changes in SV in relation to a baseline condition; (2) to assess the relationship of ΔZsys and SV in experimental subjects; and (3) to identify the influence of body dimensions on the relationship between ΔZsys and SV...
July 24, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28730554/bedside-selection-of-positive-end-expiratory-pressure-by-electrical-impedance-tomography-in-hypoxemic-patients-a-feasibility-study
#16
Nilde Eronia, Tommaso Mauri, Elisabetta Maffezzini, Stefano Gatti, Alfio Bronco, Laura Alban, Filippo Binda, Tommaso Sasso, Cristina Marenghi, Giacomo Grasselli, Giuseppe Foti, Antonio Pesenti, Giacomo Bellani
BACKGROUND: Positive end-expiratory pressure (PEEP) is a key element of mechanical ventilation. It should optimize recruitment, without causing excessive overdistension, but controversy exists on the best method to set it. The purpose of the study was to test the feasibility of setting PEEP with electrical impedance tomography in order to prevent lung de-recruitment following a recruitment maneuver. We enrolled 16 patients undergoing mechanical ventilation with PaO2/FiO2 <300 mmHg...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28725027/strong-coherent-light-amplification-with-double-electromagnetically-induced-transparency-coherences
#17
Dan Wang, Chao Liu, Changshun Xiao, Junxiang Zhang, Hessa M M Alotaibi, Barry C Sanders, Li-Gang Wang, Shiyao Zhu
We experimentally demonstrate coherent amplification of probe field in a tripod-type atoms driven by strong coupling, signal and weak probe fields. We suppress linear and nonlinear atomic absorptions for resonant and near resonant probe via double electromagnetically induced transparency (DEIT). Combining these advantages of suppressed absorption along with temperature- or atomic-density-controlled transfer of population(ToP) between hyperfine ground states, we can induce near-resonant amplification of probe through stimulated Raman scattering(SRS) pumped by low-intensity signal field...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715324/electrical-impedance-tomography-tissue-properties-to-image-measures
#18
Andy Adler, Alistair Boyle
Electrical Impedance Tomography (EIT) uses electrical stimulation and measurement at the body surface to image the electrical properties of internal tissues. It has the advantage of non-invasiveness and high temporal resolution but suffers from poor spatial resolution and sensitivity to electrode movement and contact quality. EIT can be useful to applications where there are conductive contrasts between tissues, fluids or gasses, such as imaging of cancerous or ischemic tissue or functional monitoring of breathing, blood flow, gastric motility and neural activity...
July 17, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28714853/unveiling-the-development-of-intracranial-injury-using-dynamic-brain-eit-an-evaluation-of-current-reconstruction-algorithms
#19
Haoting Li, Rongqing Chen, Canhua Xu, Benyuan Liu, Mengxing Tang, Lin Yang, Xiuzhen Dong, Feng Fu
OBJECTIVE: Dynamic brain electrical impedance tomography (EIT) is a promising technique for continuously monitoring the development of cerebral injury. While there are many reconstruction algorithms available for brain EIT, there is still a lack of study to compare their performance in the context of dynamic brain monitoring. APPROACH: To address this problem, we develop a framework for evaluating different current algorithms with their ability to correctly identify small intracranial conductivity changes...
August 21, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28707173/intraoperative-ventilation-of-morbidly-obese-patients-guided-by-transpulmonary-pressure
#20
Lars Eichler, Katarzyna Truskowska, A Dupree, P Busch, Alwin E Goetz, Christian Zöllner
BACKGROUND: Bariatric surgery has proven a successful approach in the treatment of morbid obesity and its concomitant diseases such as diabetes mellitus and arterial hypertension. Aiming for optimal management of this challenging patient cohort, tailored concepts directly guided by individual patient physiology may outperform standardized care. Implying esophageal pressure measurement and electrical impedance tomography-increasingly applied monitoring approaches to individually adjust mechanical ventilation in challenging circumstances like acute respiratory distress syndrome (ARDS) and intraabdominal hypertension-we compared our institutions standard ventilator regimen with an individually adjusted positive end expiratory pressure (PEEP) level aiming for a positive transpulmonary pressure (P L) throughout the respiratory cycle...
July 14, 2017: Obesity Surgery
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