scholarly journals New Method for Separation of Electrode Polarization Impedance from Measured Tissue Impedance

2011 ◽  
Vol 5 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Håvard Kalvøy
Keyword(s):  
New Method ◽  
Electrode Polarization ◽  
Tissue Impedance ◽  
Polarization Impedance

A New Method for Tissue Impedance Spectrometry and Its Initial Application in vivo

2014 ◽  
pp. 833-838
Author(s):  
M. Władziński ◽  
K. Wildner ◽  
S. Cygan ◽  
B. Grobelski ◽  
D. Pawełczak ◽  
...  
Keyword(s):  
New Method ◽  
Tissue Impedance ◽  
Initial Application

Electrical impedance analysis in plant tissues: in vivo detection of freezing injury

1992 ◽  
Vol 70 (11) ◽  
pp. 2254-2258 ◽  
Author(s):  
M. I. N. Zhang ◽  
J. H. M. Willison
Keyword(s):  
Electrical Impedance ◽  
Solanum Tuberosum L ◽  
Nonlinear Least Squares ◽  
Impedance Analysis ◽  
Freezing Injury ◽  
Electrode Polarization ◽  
Electrode Impedance ◽  
Membrane Injury ◽  
Tissue Impedance

Freezing injury of potato tuber tissue was studied by measuring electrical impedance, in the range of 100 Hz to 800 KHz, while the tissue was subjected to a −3 °C environment. It was found that a greater proportion of total impedance was due to electrode polarization in frozen tissues than in nonfrozen tissues. In frozen tissue, electrode impedance could be so great that tissue impedance could not be measured reliably. Analysis of tissue impedance using complex nonlinear least squares revealed some dynamics of the process of tissue freezing. After 1 h of exposure to freezing conditions, extracellular resistance began a sustained decrease. This can be explained by electrolyte leakage to extracellular space, presumably as a result of membrane injury. The capacitances of both plasma membrane and tonoplast also decreased with freezing. Key words: potato (Solanum tuberosum L.) tuber, electrical impedance, freezing injury, membrane capacitance.

scholarly journals Extracting parasite effects of electrical bioimpedance measurements

2018 ◽  
Vol 9 (1) ◽  
pp. 115-122 ◽  
Author(s):  
Douglas Dutra ◽  
Pedro Bertemes-Filho
Keyword(s):  
Impedance Spectrum ◽  
Chicken Breast ◽  
Electrode Polarization ◽  
Impedance Spectra ◽  
Tissue Impedance ◽  
Electrical Bioimpedance ◽  
In Series ◽  
Polarization Temperature ◽  
Parasitic Effects ◽  
Cole Model

Abstract The objective of this work is to develop a technique for filtering parasitic effects from the impedance spectra (IS) measured in biological material phantoms. IS data are contaminated with unexpected capacitive and inductive effects from cable, input/output amplifiers capacitances, electrode polarization, temperature and contact pressure when collecting data. It is proposed a model which contains an RLC-network in series with the Cole model (RSC), then called RLC-Cole. It was built four circuits composed by resistors, capacitors and inductors. An impedance analyzer (HF2IS) was used to perform the measurements in the frequency range of 1 to 3000 kHz. Data were fitted into the model and comparisons to the nominal values were made. In order to validate the proposed model, a gelatin phantom and a chicken breast muscle impedance spectra were also collected and analyzed. After filtering, Cole fitting was performed. Results showed a maximum root-mean-square error of 1% for the circuits, 2.63% for the gelatin phantom, whereas 2.01% for the chicken breast. The RLC-Cole model could significantly remove parasitic effects out of a tissue impedance spectrum measured by a 4-point electrode probe. This may be highly important in EIS systems whose objective is to discriminate a normal tissue from a cancerous one.

scholarly journals Description of corrections on electrode polarization impedance using isopotential interface factor

2019 ◽  
Vol 3 (1) ◽  
pp. 29-35 ◽  
Author(s):  
J. A. Gómez-Sánchez ◽  
C. J. Felice
Keyword(s):  
Biceps Brachii ◽  
Full Range ◽  
Electrode System ◽  
Electrical Anisotropy ◽  
Electrode Polarization ◽  
Polarization Impedance ◽  
Steel Aisi ◽  
Concentric Electrode

Abstract In this paper, we propose an equation and define the Isopotential Interface Factor (IIF) to quantify the contribution of electrode polarization impedance in two tetrapolar electrode shapes. The first tetrapolar electrode geometry shape was adjacent and the second axial concentric, both probes were made of stainless steel (AISI 304). The experiments were carried out with an impedance analyzer (Solartron 1260) using a frequency range between 0.1 Hz and 8 MHz. Based on a theoretical simplification, the experimental results show a lower value of the IIF in the axial concentric tetrapolar electrode system which caused a lower correction of interface value. The higher value of the IIF in the adjacent electrode system was KEEI (1Hz, 0.28 mS/cm) = 1.41 and decreased when the frequency and conductance were increased, whereas in the axial concentric electrode system was KEEI (1Hz, 0.28 mS/cm) = 0.08. The average isopotential interface factor throughout the whole range of conductivities and frequencies was 0.23 in the adjacent electrode system and 0.02 in the axial concentric electrode system. The index of inherent electrical anisotropy (IEA) was used to present an analysis of electrical anisotropy of biceps brachii muscle in vitro using the corrections of both tetrapolar electrode systems. A higher IEA was present in lower frequency where the variation below 1 kHz was 15 % in adjacent electrode configuration and 26 % in the axial concentric probe with respect to full range. The IIF is then shown that it can be used to describe the quality of an electrode system.

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