Results 221 to 230 of about 55,866 (265)

Electrical impedance of the pituitary gland

Journal of Neurosurgery, 1970
✓ Experimental and clinical measurements of electrical impedance revealed a significant well-delineated difference between the pars distalis and the pars nervosa, providing an accurate and easy means of identifying the tissue interface between these two elements of the pituitary gland.
N T, Zervas, A, Shintani, K S, Pickren
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Multifrequency electrical impedance tomography

Clinical Physics and Physiological Measurement, 1992
Multifrequency tomography may be conveniently achieved by sequentially sweeping the probing drive current and measuring the resultant voltages at each frequency. If events change during measurement comparisons between frequencies cannot be made. Mixing several frequency components may decrease acquisition time but increase the complexity of the ...
P M, Record, R, Gadd, F, Vinther
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An electrical impedance tomography microscope

Physiological Measurement, 1996
A circular array of 16 electrodes has been constructed for use as an electrical impedance tomography (EIT) microscope. The electrodes were made from 60 microns diameter gold wires anchored to a printed circuit board. The internal diameter of the array was 0.9 mm giving a theoretical spatial resolution of about 100 microns.
H, Griffiths, M G, Tucker, J, Sage, W G, Herrenden-Harker   +3 more
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Electrical impedance tomography

Current Opinion in Critical Care, 2012
Electrical impedance tomography (EIT) is a useful noninvasive tool for monitoring ventilation finding its way into the clinical setting. The focus of this review is to discuss the balance between the potential for EIT as a clinical monitor accepting a level of uncertainty and the scientific demand for absolute perfection.The controversy concerning ...
Stefan, Lundin, Ola, Stenqvist
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Electric impedance of neuroglia in vitro

Experimental Neurology, 1965
Abstract Impedance measurements were carried out on neuroglia cells from tissue culture and newborn animals as studied in vitro . Approximately 240 cells were estimated to be present in the material studied. Membrane resistivity could be measured only at a-c frequencies below 200 cycle/sec. Both electric shocks and KCl applied to the tissue produced
F D, WALKER, T, TAKENAKA
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Development of an electrical impedance tomograph

2011 8th International Conference on Electrical Engineering, Computing Science and Automatic Control, 2011
This article describes the design of an electrical impedance tomograph (EIT), with the aim to provide a tool to detect morphological changes in tissues. This design consists of an array of 16 electrodes distributed on a ring way. The 4 points technique is used to record the amplitude of the electrical impedance.
Christopher Montellano, Eladio Cardiel, Laura I. Garay, S. Rodriguez, Pablo Rogeli   +4 more
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Source Consistency Electrical Impedance Tomography

SIAM Journal on Applied Mathematics, 2020
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Tingting Zhang, Geuk Young Jang, Tong In Oh, Kyung Woon Jeung, Hun Wi, Eung Je Woo   +5 more
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A phantom for electrical impedance tomography

Clinical Physics and Physiological Measurement, 1988
A method has been developed for constructing phantoms for electrical impedance tomography (EIT). A mesh of resistors is soldered to pins in a matrix board and forms a physical realisation of a finite element numerical model. To simulate different body tissues, changes in the apparent electrical conductivity and permittivity can be introduced at a ...
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Electrical Impedance imaging of the Thorax

Journal of Microwave Power, 1983
In this paper, we propose to develop a new imaging technology, computerized impedance tomography (CIT) for imaging the thorax. Our study involves reconstructing images of thoracic transverse plane impedance distributions noninvasively and nondestructively and exploring the potential of CIT.
Y, Kim, J G, Webster, W J, Tompkins
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Definition of Impedance and Impedance of Electrical Circuits

2013
To understand the impedance of electrochemical objects, it is necessary to understand the behavior of simple electrical circuits, first in steady state, then in transient conditions. Such circuits contain simple linear electrical elements: resistance, capacitance, and inductance. Then the concept of electrical impedance will be introduced.
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