scholarly journals THE EFFECT OF FRAME RATE AND CALIBRATION ON LUNG MONITORING WITH ELECTRICAL IMPEDANCE TOMOGRAPHY

2020 ◽  
Vol 49 (4) ◽  
pp. 107-111
Author(s):  
Kristyna Koldova ◽  
David Slajfercik
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Lung Ventilation ◽  
Analysis Data ◽  
The Body ◽  
Frame Rate ◽  
Impedance Tomography ◽  
Tissue Impedance ◽  
Significance Level ◽  
Rate Analysis

Electrical impedance tomography (EIT) is a non-invasive method that records changes in tissue impedance in the selected cross-section of the body and is mainly used to monitor patient lung ventilation. The aim of this study was to analyze the effect of the set frame rate and how calibration of the EIT system effects final record when monitoring lungs using EIT system PulmoVista 500 (Dräger Medical, Germany). Ten healthy male volunteers were measured with frame rates 10, 20, 30, 40 and 50 Hz for analysis, followed by calibrated and uncalibrated measurements. The subjects were breathing spontaneously in horizontal supine position. In the frame rate analysis, data with the references 30 and 50 Hz were compared with others using a paired T-test. The same test was used for comparing data from a calibrated and uncalibrated records. This study shows that the effect of both frame rate and calibration is negligible at the significance level of 5%.

Electrical Impedance Tomography of Cell Viability in Tissue With Application to Cryosurgery

2004 ◽  
Vol 126 (2) ◽  
pp. 305-309 ◽  
Author(s):  
Rafael Davalos ◽  
Boris Rubinsky
Keyword(s):  
Electrical Properties ◽  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Cell Damage ◽  
Membrane Integrity ◽  
The Body ◽  
Impedance Tomography ◽  
Cell Membrane Integrity ◽  
Minimally Invasive Surgical Procedure ◽  
Minimally Invasive Surgical

Tissue damage that is associated with the loss of cell membrane integrity should alter the bulk electrical properties of the tissue. This study shows that electrical impedance tomography (EIT) should be able to detect and image necrotic tissue inside the body due to the permeabilization of the membrane to ions. Cryosurgery, a minimally invasive surgical procedure that uses freezing to destroy undesirable tissue, was used to investigate the hypothesis. Experimental results with liver tissue demonstrate that cell damage during freezing results in substantial changes in tissue electrical properties. Two-dimensional EIT simulations of liver cryosurgery, which employ the experimental data, demonstrate the feasibility of this application.

scholarly journals Imaging fascicular organization of peripheral nerves with fast neural Electrical Impedance Tomography (EIT)

2020 ◽  
Author(s):  
Enrico Ravagli ◽  
Svetlana Mastitskaya ◽  
Nicole Thompson ◽  
Francesco Iacoviello ◽  
Paul R Shearing ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Peripheral Nerves ◽  
Electrical Impedance ◽  
Electrode Array ◽  
Compound Action Potential ◽  
Micro Computed Tomography ◽  
Impedance Tomography ◽  
Tissue Impedance ◽  
Significant Difference ◽  
Stimulation Of

Imaging of the compound action potential (CAP) in fascicles in peripheral nerves could help avoid side effects in neuromodulation by selective stimulation of identified fascicles. Existing methods have low resolution, limited imaging depth, or are invasive. We propose fast neural electrical impedance tomography (EIT), which allows fascicular CAP imaging with a high resolution of ∼200 μm, <1 ms. This uses a non-penetrating flexible cuff electrode array with 14 circumferential electrodes. This has been validated in rat sciatic nerve by comparison to micro-computed tomography (microCT) and histology with fluorescent dextran tracers (n=5). With EIT, there were reproducible localized changes in tissue impedance in response to stimulation of individual fascicles (tibial, peroneal and sural). The reconstructed EIT images corresponded to microCT scans and neural tracer histology, with significant separation between the fascicles (p<0.01), and no significant difference between techniques. The standard deviation from the mean fascicle position for EIT was 86 μm (6% of nerve diameter). This suggests fast neural EIT can reliably image the functional fascicular anatomy of the nerves and so aid selective neuromodulation.

Sign in / Sign up

Export Citation Format

Share Document