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electrical impedance tomography

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https://www.readbyqxmd.com/read/28237681/assessment-of-distribution-of-ventilation-and-regional-lung-compliance-by-electrical-impedance-tomography-in-anaesthetized-horses-undergoing-alveolar-recruitment-manoeuvres
#1
Tamas D Ambrisko, Johannes Schramel, Klaus Hopster, Sabine Kästner, Yves Moens
OBJECTIVE: To examine changes in the distribution of ventilation and regional lung compliances in anaesthetized horses during the alveolar recruitment manoeuvre (ARM). STUDY DESIGN: Experimental study in which a series of treatments were administered in a fixed order on one occasion. ANIMALS: Five adult Warmblood horses. METHODS: Animals were anaesthetized (xylazine, midazolam-ketamine, isoflurane), placed in dorsal recumbency and ventilated with 100% oxygen using peak inspiratory pressure (PIP) and positive end-expiratory pressure (PEEP) of 20 cmH2O and 0 cmH2O, respectively...
January 12, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/28227703/evaluation-of-lung-ventilation-distribution-in-chronic-obstructive-pulmonary-disease-patients-using-the-global-inhomogeneity-index
#2
F Trenk, L Mendes, P Carvalho, R P Paiva, J Henriques, N Maglaveras, I Chouvarda, V Tsara, C A Teixeira, F Trenk, L Mendes, P Carvalho, R P Paiva, J Henriques, N Maglaveras, I Chouvarda, V Tsara, C A Teixeira, P Carvalho, V Tsara, L Mendes, C A Teixeira, J Henriques, F Trenk, N Maglaveras, I Chouvarda, R P Paiva
The global inhomogeneity (GI) index is a electrical impedance tomography (EIT) parameter that quantifies the tidal volume distribution within the lung. In this work the global inhomogeneity index was computed for twenty subjects in order to evaluate his potential use in the detection and follow up of chronic obstructive pulmonary disease (COPD) patients. EIT data of 17 subjects were acquired: 14 patients with the main diagnoses of COPD and 3 healthy subjects which served as a control group. Two or three datasets of around 30 seconds were acquired at 33 scans/s and analysed for each subject...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227447/non-invasive-monitoring-of-pulmonary-artery-pressure-at-the-bedside
#3
M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, S F Rimoldi, E Muntane, J Sola, M Lemay, A Adler, J-Ph Thiran, F Braun
Current solutions for the monitoring of pulmonary artery pressure (PAP) in patients suffering from pulmonary hypertension are limited to invasive means. Non-invasive alternatives, such as Doppler echocardiography, are incompatible with continuous monitoring due to their dependency on qualified personnel to perform the measurements. In the present study, a novel non-invasive and unsupervised approach based on the use of electrical impedance tomography (EIT) is presented. The approach was evaluated in three healthy subjects undergoing hypoxia-induced variations in PAP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224077/electrical-impedance-tomography-and-trans-pulmonary-pressure-measurements-in-a-patient-with-extreme-respiratory-drive
#4
Atsuko Shono, Peter Somhorst, Diederik Gommers
Preserving spontaneous breathing during mechanical ventilation prevents muscle atrophy of the diaphragm, but may lead to ventilator induced lung injury (VILI). We present a case in which monitoring of trans-pulmonary pressure and ventilation distribution using Electrical Impedance Tomography (EIT) provided essential information for preventing VILI.
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28212050/volume-controlled-ventilation-does-not-prevent-injurious-inflation-during-spontaneous-effort
#5
Takeshi Yoshida, Susumu Nakahashi, Maria Aparecida Miyuki Nakamura, Yukiko Koyama, Rollin Roldan, Vinicius Torsani, Roberta R De Santis, Susimeire Gomes, Akinori Uchiyama, Marcelo B P Amato, Brian P Kavanagh, Yuji Fujino
RATIONALE: Spontaneous breathing during mechanical ventilation increases transpulmonary pressure and tidal volume, and worsens lung injury. Intuitively, controlling tidal volume and transpulmonary pressure might limit injury from added spontaneous effort. OBJECTIVES: To test the hypothesis that during spontaneous effort in injured lungs, tidal volume and transpulmonary pressure limitation by volume-controlled ventilation results in less injurious patterns of inflation...
February 17, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28205251/multishot-echo-planar-mreit-for-fast-imaging-of-conductivity-current-density-and-electric-field-distributions
#6
Munish Chauhan, Rohini Vidya Shankar, Neeta Ashok Kumar, Vikram D Kodibagkar, Rosalind Sadleir
PURPOSE: Magnetic resonance electrical impedance tomography (MREIT) sequences typically use conventional spin or gradient echo-based acquisition methods for reconstruction of conductivity and current density maps. Use of MREIT in functional and electroporation studies requires higher temporal resolution and faster sequences. Here, single and multishot echo planar imaging (EPI) based MREIT sequences were evaluated to see whether high-quality MREIT phase data could be obtained for rapid reconstruction of current density, conductivity, and electric fields...
February 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28199154/individualized-multiplanar-electrical-impedance-tomography-in-infants-to-optimize-lung-monitoring
#7
Martijn Miedema, Andreas Waldmann, Karen E McCall, Stephan H Böhm, Anton H van Kaam, David G Tingay
No abstract text is available yet for this article.
February 15, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28150228/personalizing-mechanical-ventilation-according-to-physiologic-parameters-to-stabilize-alveoli-and-minimize-ventilator-induced-lung-injury-vili
#8
REVIEW
Gary F Nieman, Joshua Satalin, Penny Andrews, Hani Aiash, Nader M Habashi, Louis A Gatto
It has been shown that mechanical ventilation in patients with, or at high-risk for, the development of acute respiratory distress syndrome (ARDS) can be a double-edged sword. If the mechanical breath is improperly set, it can amplify the lung injury associated with ARDS, causing a secondary ventilator-induced lung injury (VILI). Conversely, the mechanical breath can be adjusted to minimize VILI, which can reduce ARDS mortality. The current standard of care ventilation strategy to minimize VILI attempts to reduce alveolar over-distension and recruitment-derecruitment (R/D) by lowering tidal volume (Vt) to 6 cc/kg combined with adjusting positive-end expiratory pressure (PEEP) based on a sliding scale directed by changes in oxygenation...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28146122/a-versatile-and-reproducible-multi-frequency-electrical-impedance-tomography-system
#9
James Avery, Thomas Dowrick, Mayo Faulkner, Nir Goren, David Holder
A highly versatile Electrical Impedance Tomography (EIT) system, nicknamed the ScouseTom, has been developed. The system allows control over current amplitude, frequency, number of electrodes, injection protocol and data processing. Current is injected using a Keithley 6221 current source, and voltages are recorded with a 24-bit EEG system with minimum bandwidth of 3.2 kHz. Custom PCBs interface with a PC to control the measurement process, electrode addressing and triggering of external stimuli. The performance of the system was characterised using resistor phantoms to represent human scalp recordings, with an SNR of 77...
January 31, 2017: Sensors
https://www.readbyqxmd.com/read/28141516/a-versatile-noise-performance-metric-for-electrical-impedance-tomography-algorithms
#10
Fabian Braun, Martin Proenca, Josep Sola, Jean-Philippe Thiran, Andy Adler
Electrical impedance tomography (EIT) is an emerging technology for real-time monitoring of patients under mechanical ventilation. EIT has the potential to offer continuous medical monitoring while being non-invasive, radiation-free and low-cost. Due to their ill-posedness, image reconstruction typically uses regularization, which implies a hyperparameter controlling the trade-off between noise rejection and resolution or other accuracies. In order to compare reconstruction algorithms, it is common to choose hyperparameter values such that the reconstructed images have equal noise performance (NP), i...
January 26, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28121374/lobe-based-image-reconstruction-in-electrical-impedance-tomography
#11
Benjamin Schullcke, Bo Gong, Sabine Krueger-Ziolek, Merryn Tawhai, Andy Adler, Ullrich Mueller-Lisse, Knut Moeller
PURPOSE: Electrical Impedance Tomography (EIT) is an imaging modality used to generate two-dimensional cross-sectional images representing impedance change in the thorax. The impedance of lung tissue changes with change in air content of the lungs; hence, EIT can be used to examine regional lung ventilation in patients with abnormal lungs. In lung EIT, electrodes are attached around the circumference of the thorax to inject small alternating currents and measure resulting voltages. In contrast to X-ray computed tomography (CT), EIT images do not depict a thorax slice of well defined thickness, but instead visualize a lens-shaped region around the electrode plane, which results from diffuse current propagation in the thorax...
December 9, 2016: Medical Physics
https://www.readbyqxmd.com/read/28120886/soft-nanocomposite-based-multi-point-multi-directional-strain-mapping-sensor-using-anisotropic-electrical-impedance-tomography
#12
Hyosang Lee, Donguk Kwon, Haedo Cho, Inkyu Park, Jung Kim
The practical utilization of soft nanocomposites as a strain mapping sensor in tactile sensors and artificial skins requires robustness for various contact conditions as well as low-cost fabrication process for large three dimensional surfaces. In this work, we propose a multi-point and multi-directional strain mapping sensor based on multiwall carbon nanotube (MWCNT)-silicone elastomer nanocomposites and anisotropic electrical impedance tomography (aEIT). Based on the anisotropic resistivity of the sensor, aEIT technique can reconstruct anisotropic resistivity distributions using electrodes around the sensor boundary...
January 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28114109/methods-for-calculating-the-electrode-position-jacobian-for-impedance-imaging
#13
A Boyle, M G Crabb, M Jehl, W R B Lionheart, A Adler
: Electrical impedance tomography (EIT) or electrical resistivity tomography (ERT) current and measure voltages at the boundary of a domain through electrodes. SIGNIFICANCE: The movement or incorrect placement of electrodes may lead to modelling errors that result in significant reconstructed image artifacts. These errors may be accounted for by allowing for electrode position estimates in the model. Movement may be reconstructed through a first-order approximation, the electrode position Jacobian...
January 23, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28114061/incorporating-a-spatial-prior-into-nonlinear-d-bar-eit-imaging-for-complex-admittivities
#14
Sarah J Hamilton, J L Mueller, M Alsaker
Electrical Impedance Tomography (EIT) aims to recover the internal conductivity and permittivity distributions of a body from electrical measurements taken on electrodes on the surface of the body. The reconstruction task is a severely ill-posed nonlinear inverse problem that is highly sensitive to measurement noise and modeling errors. Regularized D-bar methods have shown great promise in producing noise-robust algorithms by employing a low-pass filtering of nonlinear (nonphysical) Fourier transform data specific to the EIT problem...
February 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28113311/absolute-reconstructions-using-rotational-electrical-impedance-tomography-for-breast-cancer-imaging
#15
Ethan K Murphy, Aditya Mahara, Ryan J Halter
A rotational Electrical Impedance Tomography (rEIT) methodology is described and shown to produce spatially accurate absolute reconstructions with improved image contrast and an improved ability to distinguish closely spaced inclusions compared to traditional EIT on data recorded from cylindrical and breast-shaped tanks. Rotations of the tank without altering the interior conductivity distribution are used to produce the rEIT data. Quantitatively, rEIT was able to distinguish two inclusions that were 1.5 cm closer together than traditional EIT could achieve for inclusions placed 2 to 3 cm from the center for the cylindrical tank, and rEIT was able to distinguish two tumor-like inclusions where traditional EIT could not reliably do so...
December 15, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28109943/regional-ventilation-during-phonation-in-professional-male-and-female-singers
#16
Louisa Traser, Jana Knab, Matthias Echternach, Hannah Fuhrer, Bernhard Richter, Hartmut Buerkle, Stefan Schumann
The respiratory system is a central part of voice production, but details in breath control during phonation are not yet fully understood. This study therefore aims to investigate regional ventilation of the lungs during phonation. It was analyzed in 11 professional singers using electrical impedance tomography during breathing and phonation with maximum phonation time. Our results show differences in impedance changes between phonation and exhalation in the courses of time and amplitude normalized curves. Furthermore, differences related to gender and professionalism were found in the temporal and spatial profiles of regional ventilation...
January 18, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28107524/the-frequency-spectral-properties-of-electrode-skin-contact-impedance-on-human-head-and-its-frequency-dependent-effects-on-frequency-difference-eit-in-stroke-detection-from-10hz-to-1mhz
#17
Lin Yang, Meng Dai, Canhua Xu, Ge Zhang, Weichen Li, Feng Fu, Xuetao Shi, Xiuzhen Dong
Frequency-difference electrical impedance tomography (fdEIT) reconstructs frequency-dependent changes of a complex impedance distribution. It has a potential application in acute stroke detection because there are significant differences in impedance spectra between stroke lesions and normal brain tissues. However, fdEIT suffers from the influences of electrode-skin contact impedance since contact impedance varies greatly with frequency. When using fdEIT to detect stroke, it is critical to know the degree of measurement errors or image artifacts caused by contact impedance...
2017: PloS One
https://www.readbyqxmd.com/read/28103448/bedside-contribution-of-electrical-impedance-tomography-to-set-positive-end-expiratory-pressure-for-ecmo-treated-severe-ards-patients
#18
Guillaume Franchineau, Nicolas Bréchot, Guillaume Lebreton, Guillaume Hekimian, Ania Nieszkowska, Jean-Louis Trouillet, Pascal Leprince, Jean Chastre, Charles-Edouard Luyt, Alain Combes, Matthieu Schmidt
RATIONALE: Optimal positive end-expiratory pressure (PEEP) is unknown in severe acute respiratory distress syndrome (ARDS) patients on extracorporeal membrane oxygenation (ECMO) receiving mechanical ventilation with very low tidal volume. OBJECTIVES: To evaluate electrical impedance tomography's (EIT) ability to monitor a PEEP trial and to derive from EIT the best compromise PEEP in this setting. METHODS: A decremental PEEP trial (20-0 cmH2O) in 5 cmH2O steps was monitored by EIT, with lung images divided into four ventral-to-dorsal horizontal regions of interest...
January 19, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28094413/electrical-impedance-tomography-for-lung-ventilation-monitoring-of-the-dog
#19
Simon Gloning, Korbinian Pieper, Martin Zoellner, Andrea Meyer-Lindenberg
BACKGROUND: Electrical impedance tomography (EIT) is a radiation free technique which takes advantage of the different electrical conductivities of different tissues. Its main field of application is lung ventilation monitoring. The aim of this prospective study was to evaluate the feasibility of collecting EIT information on a sample of dogs with different thoracic shapes under clinical conditions by connecting an electrode belt without fur clipping. MATERIAL AND METHODS: Fifteen pulmonary healthy dogs were anaesthetized, positioned in sternal recumbency and ventilated in a pressure-controlled mode at three different positive end-expiratory pressure levels (PEEP) of 0, 5 and 10 cmH2O for five breaths each, with a peak inspiratory pressure of 15 cmH2O...
February 9, 2017: Tierärztliche Praxis. Ausgabe K, Kleintiere/Heimtiere
https://www.readbyqxmd.com/read/28086909/fast-detection-and-data-compensation-for-electrodes-disconnection-in-long-term-monitoring-of-dynamic-brain-electrical-impedance-tomography
#20
Ge Zhang, Meng Dai, Lin Yang, Weichen Li, Haoting Li, Canhua Xu, Xuetao Shi, Xiuzhen Dong, Feng Fu
BACKGROUND: Electrode disconnection is a common occurrence during long-term monitoring of brain electrical impedance tomography (EIT) in clinical settings. The data acquisition system suffers remarkable data loss which results in image reconstruction failure. The aim of this study was to: (1) detect disconnected electrodes and (2) account for invalid data. METHODS: Weighted correlation coefficient for each electrode was calculated based on the measurement differences between well-connected and disconnected electrodes...
January 7, 2017: Biomedical Engineering Online
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