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electrical impedance tomography

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https://www.readbyqxmd.com/read/28871138/predicting-irreversible-electroporation-induced-tissue-damage-by-means-of-magnetic-resonance-electrical-impedance-tomography
#1
Matej Kranjc, Simona Kranjc, Franci Bajd, Gregor Serša, Igor Serša, Damijan Miklavčič
Irreversible electroporation (IRE) is gaining importance in routine clinical practice for nonthermal ablation of solid tumors. For its success, it is extremely important that the coverage and exposure time of the treated tumor to the electric field is within the specified range. Measurement of electric field distribution during the electroporation treatment can be achieved using magnetic resonance electrical impedance tomography (MREIT). Here, we show improved MREIT-enabled electroporation monitoring of IRE-treated tumors by predicting IRE-ablated tumor areas during IRE of mouse tumors in vivo...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28863695/a-multi-frequency-electrical-impedance-tomography-system-for-real-time-2d-and-3d-imaging
#2
Yunjie Yang, Jiabin Jia
This paper presents the design and evaluation of a configurable, fast multi-frequency Electrical Impedance Tomography (mfEIT) system for real-time 2D and 3D imaging, particularly for biomedical imaging. The system integrates 32 electrode interfaces and the current frequency ranges from 10 kHz to 1 MHz. The system incorporates the following novel features. First, a fully adjustable multi-frequency current source with current monitoring function is designed. Second, a flexible switching scheme is developed for arbitrary sensing configuration and a semi-parallel data acquisition architecture is implemented for high-frame-rate data acquisition...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28858252/a-quantitative-evaluation-of-drive-pattern-selection-for-optimizing-eit-based-stretchable-sensors
#3
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/28832898/spontaneous-breathing-trials-after-prolonged-mechanical-ventilation-monitored-by-electrical-impedance-tomography-an-observational-study
#4
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
#5
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/28828363/positive-end-expiratory-pressure-how-to-set-it-at-the-individual-level
#6
REVIEW
Luciano Gattinoni, Francesca Collino, Giorgia Maiolo, Francesca Rapetti, Federica Romitti, Tommaso Tonetti, Francesco Vasques, Michael Quintel
The positive end-expiratory pressure (PEEP), since its introduction in the treatment of acute respiratory failure, up to the 1980s was uniquely aimed to provide a viable oxygenation. Since the first application, a large debate about the criteria for selecting the PEEP levels arose within the scientific community. Lung mechanics, oxygen transport, venous admixture thresholds were all proposed, leading to PEEP recommendations from 5 up to 25 cmH2O. Throughout this period, the main concern was the hemodynamics...
July 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28818695/direct-detection-of-neural-activity-in-vitro-using-magnetic-resonance-electrical-impedance-tomography-mreit
#7
Rosalind J Sadleir, Fanrui Fu, Corey Falgas, Stephen Holland, May Boggess, Samuel C Grant, Eung Je Woo
We describe a sequence of experiments performed in vitro to verify the existence of a new magnetic resonance imaging contrast - Magnetic Resonance Electrical Impedance Tomography (MREIT) -sensitive to changes in active membrane conductivity. We compared standard deviations in MREIT phase data from spontaneously active Aplysia abdominal ganglia in an artificial seawater background solution (ASW) with those found after treatment with an excitotoxic solution (KCl). We found significant increases in MREIT treatment cases, compared to control ganglia subject to extra ASW...
August 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28809514/individualization-of-positive-end-expiratory-pressure-setting-in-patients-with-acute-respiratory-distress-syndrome-under-extracorporeal-membrane-oxygenation-inputs-from-electrical-impedance-tomography
#8
Claude Guérin
No abstract text is available yet for this article.
August 15, 2017: American Journal of Respiratory and Critical Care Medicine
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
#9
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/28775284/a-post-processing-method-for-three-dimensional-electrical-impedance-tomography
#10
Sébastien Martin, Charles T M Choi
Electrical impedance tomography is a modern biomedical imaging method. Its goal is to image the electrical properties of human tissues. This approach is safe for the patient's health, is non-invasive and has no known hazards. However, the approach suffers from low accuracy. Linear inverse solvers are commonly used in medical applications, as they are strongly robust to noise. However, linear methods can give only an approximation of the solution that corresponds to a linear perturbation from an initial estimate...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28767360/software-toolbox-for-low-frequency-conductivity-and-current-density-imaging-using-mri
#11
Saurav Z K Sajib, Nitish Katoch, Hyung Joong Kim, Oh In Kwon, Eung Je Woo
OBJECTIVE: Low-frequency conductivity and current density imaging using MRI includes magnetic resonance electrical impedance tomography (MREIT), diffusion tensor MREIT (DT-MREIT), conductivity tensor imaging (CTI), and magnetic resonance current density imaging (MRCDI). MRCDI and MREIT provide current density and isotropic conductivity images, respectively, using current-injection phase MRI techniques. DT-MREIT produces anisotropic conductivity tensor images by incorporating diffusion weighted MRI into MREIT...
July 27, 2017: IEEE Transactions on Bio-medical Engineering
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
#12
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/28762180/optimum-support-by-high-flow-nasal-cannula-in-acute-hypoxemic-respiratory-failure-effects-of-increasing-flow-rates
#13
Tommaso Mauri, Laura Alban, Cecilia Turrini, Barbara Cambiaghi, Eleonora Carlesso, Paolo Taccone, Nicola Bottino, Alfredo Lissoni, Savino Spadaro, Carlo Alberto Volta, Luciano Gattinoni, Antonio Pesenti, Giacomo Grasselli
PURPOSE: Limited data exist on the correlation between higher flow rates of high-flow nasal cannula (HFNC) and its physiologic effects in patients with acute hypoxemic respiratory failure (AHRF). We assessed the effects of HFNC delivered at increasing flow rate on inspiratory effort, work of breathing, minute ventilation, lung volumes, dynamic compliance and oxygenation in AHRF patients. METHODS: A prospective randomized cross-over study was performed in non-intubated patients with patients AHRF and a PaO2/FiO2 (arterial partial pressure of oxygen/fraction of inspired oxygen) ratio of ≤300 mmHg...
July 31, 2017: Intensive Care Medicine
https://www.readbyqxmd.com/read/28749379/theoretical-limits-to-sensitivity-and-resolution-in-magneto-acousto-electrical-tomography
#14
Elyar Ghalichi, Nevzat Guneri Gencer
In this study, the performance of Magneto-Acousto Electrical Tomography (MAET) method is investigated quantitatively by considering interrelations between its sensitivity, resolution and conductivity contrast. An analytical solution for the forward problem of MAET is derived for two-dimensional (2D) concentric bodies by Separation of Variables Method. The electric potential and the acoustic pressure are separated to their angular and radial components. The series coefficients for these solutions are obtained by their respective boundary conditions...
July 27, 2017: Physics in Medicine and Biology
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/28742723/supraglottic-atomization-of-surfactant-in-spontaneously-breathing-lambs-receiving-continuous-positive-airway-pressure
#16
Ilaria Milesi, David G Tingay, Anna Lavizzari, Federico Bianco, Emanuela Zannin, Paolo Tagliabue, Fabio Mosca, Maria Luisa Ventura, Anushi Rajapaksa, Elizabeth J Perkins, Don Black, Marco Di Castri, Magdy Sourial, Gerhard Pohlmann, Raffaele L Dellaca'
OBJECTIVES: To determine the short-term tolerance, efficacy, and lung deposition of supraglottic atomized surfactant in spontaneously breathing lambs receiving continuous positive airway pressure. DESIGN: Prospective, randomized animal study. SETTING: Animal research laboratory. SUBJECTS: Twenty-two preterm lambs on continuous positive airway pressure (132 ± 1 d gestational age). INTERVENTIONS: Animals receiving continuous positive airway pressure via binasal prongs at 8 cm H2O were randomized to receive atomized surfactant at approximately 60-minute of life (atom; n = 15) or not (control; n = 7)...
September 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28730574/mechanical-ventilation-guided-by-electrical-impedance-tomography-in-pediatric-acute-respiratory-distress-syndrome
#17
Jeffrey Dmytrowich, Tanya Holt, Karen Schmid, Gregory Hansen
Mechanical ventilation strategies in pediatric acute respiratory distress syndrome (pARDS) continue to advance. Optimizing positive end expiratory pressure (PEEP) and ventilation to recruitable lung can be difficult to clinically achieve. This is in part, due to disease evolution, unpredictable changes in lung compliance, and the inability to assess regional tidal volumes in real time at the bedside. Here we report the utilization of thoracic electrical impedance tomography to guide daily PEEP settings and recruitment maneuvers in a child with pARDS...
July 20, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28730554/bedside-selection-of-positive-end-expiratory-pressure-by-electrical-impedance-tomography-in-hypoxemic-patients-a-feasibility-study
#18
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/28726575/bioprinting-pattern-dependent-electrical-mechanical-behavior-of-cardiac-alginate-implants-characterization-and-ex-vivo-phase-contrast-microtomography-assessment
#19
Mohammad Izadifar, Paul Babyn, Michael E Kelly, Dean Chapman, Xiongbiao Chen
Three-dimensional (3D)-bioprinting techniques may be used to modulate electrical/mechanical properties and porosity of hydrogel constructs for fabrication of suitable cardiac implants. Notably, characterization of these properties after implantation remains a challenge, raising the need for the development of novel quantitative imaging techniques for monitoring hydrogel implant behavior in situ. This study aims at (i) assessing the influence of hydrogel bioprinting patterns on electrical/mechanical behavior of cardiac implants based on a 3D-printing technique and (ii) investigating the potential of synchrotron X-ray phase-contrast imaging computed tomography (PCI-CT) for estimating elastic modulus/impedance/porosity and microstructural features of 3D-printed cardiac implants in situ via an ex vivo study...
September 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28719759/airway-closure-could-be-confirmed-by-electrical-impedance-tomography
#20
Xiu-Mei Sun, Guang-Qiang Chen, Yi-Min Zhou, Yan-Lin Yang, Jian-Xin Zhou
No abstract text is available yet for this article.
July 18, 2017: American Journal of Respiratory and Critical Care Medicine
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