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electrical impedance tomography

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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/27906709/looking-closer-at-acute-respiratory-distress-syndrome-the-role-of-advanced-imaging-techniques
#2
Giacomo Bellani, Jean-Jaques Rouby, Jean-Michel Constantin, Antonio Pesenti
PURPOSE OF REVIEW: Advanced imaging techniques have provided invaluable insights in understanding of acute respiratory distress syndrome (ARDS) and the effect of therapeutic strategies, thanks to the possibility of gaining regional information and moving from simple 'anatomical' information to in-vivo functional imaging. RECENT FINDINGS: Computed tomography (CT) led to the understanding of several ARDS mechanisms and interaction with mechanical ventilation. It is nowadays frequently part of routine diagnostic workup, often leading to treatment changes...
November 30, 2016: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/27897152/a-novel-multi-frequency-electrical-impedance-tomography-spectral-imaging-algorithm-for-early-stroke-detection
#3
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
#4
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/27878858/non-invasive-tools-for-the-diagnosis-of-cutaneous-melanoma
#5
REVIEW
C Fink, H A Haenssle
BACKGROUND: While the excisional biopsy and histological examination of suspicious lesions remains the current gold standard for diagnosing cutaneous melanoma (CM), there is a demand for more objective and non-invasive examination methods that may support clinicians in their decision when to biopsy or not. METHODS: This review is based on publications and guidelines retrieved by a selective search in PubMed and MEDLINE and focused on non-invasive diagnostic strategies for detecting melanoma...
November 22, 2016: Skin Research and Technology
https://www.readbyqxmd.com/read/27871877/journal-allergy-clinical-immunology-perspective-clinical-potential-for-imaging-in-asthma-and-other-lung-disorders
#6
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/27869707/ex-vivo-characterization-of-bioimpedance-spectroscopy-of-normal-ischemic-and-hemorrhagic-rabbit-brain-tissue-at-frequencies-from-10-hz-to-1-mhz
#7
Lin Yang, Ge Zhang, Jiali Song, Meng Dai, Canhua Xu, Xiuzhen Dong, Feng Fu
Stroke is a severe cerebrovascular disease and is the second greatest cause of death worldwide. Because diagnostic tools (CT and MRI) to detect acute stroke cannot be used until the patient reaches the hospital setting, a portable diagnostic tool is urgently needed. Because biological tissues have different impedance spectra under normal physiological conditions and different pathological states, multi-frequency electrical impedance tomography (MFEIT) can potentially detect stroke. Accurate impedance spectra of normal brain tissue (gray and white matter) and stroke lesions (ischemic and hemorrhagic tissue) are important elements when studying stroke detection with MFEIT...
November 18, 2016: Sensors
https://www.readbyqxmd.com/read/27854325/a-deformable-smart-skin-for-continuous-sensing-based-on-electrical-impedance-tomography
#8
Francesco Visentin, Paolo Fiorini, Kenji Suzuki
In this paper, we present a low-cost, adaptable, and flexible pressure sensor that can be applied as a smart skin over both stiff and deformable media. The sensor can be easily adapted for use in applications related to the fields of robotics, rehabilitation, or costumer electronic devices. In order to remove most of the stiff components that block the flexibility of the sensor, we based the sensing capability on the use of a tomographic technique known as Electrical Impedance Tomography. The technique allows the internal structure of the domain under study to be inferred by reconstructing its conductivity map...
November 16, 2016: Sensors
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/27842743/assessing-respiratory-system-mechanical-function
#10
REVIEW
Ruben D Restrepo, Diana M Serrato, Rodrigo Adasme
The main goals of assessing respiratory system mechanical function are to evaluate the lung function through a variety of methods and to detect early signs of abnormalities that could affect the patient's outcomes. In ventilated patients, it has become increasingly important to recognize whether respiratory function has improved or deteriorated, whether the ventilator settings match the patient's demand, and whether the selection of ventilator parameters follows a lung-protective strategy. Ventilator graphics, esophageal pressure, intra-abdominal pressure, and electric impedance tomography are some of the best-known monitoring tools to obtain measurements and adequately evaluate the respiratory system mechanical function...
December 2016: Clinics in Chest Medicine
https://www.readbyqxmd.com/read/27783382/short-term-effects-of-neuromuscular-blockade-on-global-and-regional-lung-mechanics-oxygenation-and-ventilation-in-pediatric-acute-hypoxemic-respiratory-failure
#11
Marlon E F Wilsterman, Pauline de Jager, Robert Blokpoel, Inez Frerichs, Sandra K Dijkstra, Marcel J I J Albers, Johannes G M Burgerhof, Dick G Markhorst, Martin C J Kneyber
BACKGROUND: Neuromuscular blockade (NMB) has been shown to improve outcome in acute respiratory distress syndrome (ARDS) in adults, challenging maintaining spontaneous breathing when there is severe lung injury. We tested in a prospective physiological study the hypothesis that continuous administration of NMB agents in mechanically ventilated children with severe acute hypoxemic respiratory failure (AHRF) improves the oxygenation index without a redistribution of tidal volume V T toward non-dependent lung zones...
December 2016: Annals of Intensive Care
https://www.readbyqxmd.com/read/27775928/two-alternatives-for-magnetic-resonance-electrical-impedance-tomography-injected-or-induced-current
#12
Hasan H Eroğlu, B Murat Eyüboğlu
In this paper, the abilities of injected current magnetic resonance electrical impedance tomography (MREIT) and induced current magnetic resonance electrical impedance tomography (ICMREIT) systems to differentiate a conductivity perturbation from an otherwise uniform conductivity distribution are compared. The sensitivity of MREIT measurements changes as a function of distance to the electrodes used for current injection. The sensitivity of ICMREIT measurements is related to the radial location, being a minimum for concentrically located small conductivity perturbations...
October 24, 2016: Physiological Measurement
https://www.readbyqxmd.com/read/27702853/left-atrial-model-reconstruction-in-atrial-fibrillation-ablation-reliability-of-new-mapping-and-complex-impedance-systems
#13
Aldo Bonso, Mauro Fantinel, Giovanna Scalchi, Sabrina Ferrara, Stefano Indiani, Federico Calore, Claudia Licciardello
AIMS: The effectiveness of atrial fibrillation (AF) ablation relies on detailed knowledge of the anatomy of the left atrium (LA) and pulmonary veins (PVs). It is common to combine computed tomography/magnetic resonance (CT/MR) with imaging by electroanatomical (EA) mapping systems. The aim of this study was to evaluate the accuracy of LA anatomical reconstruction by 'One Model' and 'VeriSense' tools (Ensite Velocity 3.0, St Jude Medical), compared with CT/MR imaging. METHODS AND RESULTS: Seventy-two patients with AF underwent pre-procedural imaging (97% CT-scan, 3% MR imaging) and transcatheter ablation of PVs...
October 4, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
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/27687426/noninvasive-ventilation-during-spontaneous-breathing-anesthesia-an-observational-study-using-electrical-impedance-tomography
#15
Julien Bordes, Philippe Goutorbe, Pierre Julien Cungi, Marie Caroline Boghossian, Eric Kaiser
STUDY OBJECTIVE: To assess the effects of noninvasive ventilation (NIV) during spontaneous breathing anesthesia on functional residual capacity and ventilation distribution. DESIGN: Prospective and observational study. SETTING: Operating room, military teaching hospital. PATIENTS: Eighteen adult patients submitted to digestive endoscopic procedures under spontaneous breathing anesthesia. INTERVENTIONS: Anesthetic management was standardized...
November 2016: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/27682815/electrical-impedance-tomography-during-mechanical-ventilation
#16
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/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/27612691/monitoring-the-evolution-of-boron-doped-porous-diamond-electrode-on-flexible-retinal-implant-by-oct-and-in-vivo-impedance-spectroscopy
#19
Clément Hébert, Myline Cottance, Julie Degardin, Emmanuel Scorsone, Lionel Rousseau, Gaelle Lissorgues, Philippe Bergonzo, Serge Picaud
Nanocrystalline Boron doped Diamond proved to be a very attractive material for neural interfacing, especially with the retina, where reduce glia growth is observed with respect to other materials, thus facilitating neuro-stimulation over long terms. In the present study, we integrated diamond microelectrodes on a polyimide substrate and investigated their performances for the development of neural prosthesis. A full description of the microfabrication of the implants is provided and their functionalities are assessed using cyclic voltammetry and electrochemical impedance spectroscopy...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
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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