Related Papers
Bioelectrical Impedance Methods for Noninvasive Health Monitoring: A Review
Thi Thu Uyen Le
Under the alternating electrical excitation, biological tissues produce a complex electrical impedance which depends on tissue composition, structures, health status, and applied signal frequency, and hence the bioelectrical impedance methods can be utilized for noninvasive tissue characterization. As the impedance responses of these tissue parameters vary with frequencies of the applied signal, the impedance analysis conducted over a wide frequency band provides more information about the tissue interiors which help us to better understand the biological tissues anatomy, physiology, and pathology. Over past few decades, a number of impedance based noninvasive tissue characterization techniques such as bioelectrical impedance analysis (BIA), electrical impedance spectroscopy (EIS), electrical impedance plethysmography (IPG), impedance cardiography (ICG), and electrical impedance tomography (EIT) have been proposed and a lot of research works have been conducted on these methods for noninvasive tissue characterization and disease diagnosis. In this paper BIA, EIS, IPG, ICG, and EIT techniques and their applications in different fields have been reviewed and technical perspective of these impedance methods has been presented. The working principles, applications, merits, and demerits of these methods has been discussed in detail along with their other technical issues followed by present status and future trends.
Ijca Proceedings on 4th International It Summit Confluence 2013 the Next Generation Information Technology Summit
Bioelectrical Impedance: A Future Health Care Technology
2014 •
Padma Batra
A New Method for Measurement of Bioelectrical Impedance
2011 •
Rahul Pratap Singh
The paper describes the theory and practical implementation of a four-electrode method for measuring complex bioimpedance of local tissue. This new method adopts three independent voltages Vin+, Vin-, VR respectively from the two voltage electrodes and a sample resistor R, which is connected in serial with one of the two voltage electrodes. Theoretical analysis shows that real part Zreal and imaginary part Zimag of the complex impedance between two voltage electrodes can be acquired from the modular ratios (|Vin+|/|VR|), (|VIN-|/|VR|) and phase difference (IN+ - R), (IN + - R) through simple calculation. The problems with the conventional methods are avoided with this novel technique.
Advances in electrical impedance methods in medical diagnostics
Jerzy Wtorek
The electrical impedance diagnostic methods and instrumentation developed at the Gda ´ nsk and Warsaw Universities of Technology are described. On the basis of knowledge of their features, several original approaches to the broad field of electrical impedance applications are discussed. Analysis of electrical field distribution after external excitation, including electrode impedance, is of primary importance for measurement accuracy and determining the properties of the structures tested. Firstly, the problem of electrical tissue properties is discussed. Particular cells are specified for in vitro and in vivo measurements and for impedance spectrometry. Of especial importance are the findings concerning the electrical properties of breast cancer, muscle anisotropy and the properties of heart tissue and flowing blood. The applications are both important and wide-ranging but, for the present, special attention has been focused on the evaluation of cardiosurgical interventions. Second...
IETE Journal of Research
2020 •
sharwan kumar
International Journal of Advanced Computer Science and Applications
Design of Low Cost Bio-impedance Measuring Instrument
2022 •
RAJESH BIROK
Performance Evaluation of Complex Electrical Bio-impedance from V/I Four-electrode Measurements
SALIM ISTYAQ
The passive electrical properties of a tissue depends on the intrinsic constituents and its structure, therefore by measuring the complex electrical impedance of the tissue it might be possible to obtain indicators of the tissue state or physiological activity [1]. Complete bio-impedance information relative to physiology and pathology of a human body and functional states of the body tissue or organs can be extracted by using a technique containing a four electrode measurement setup. This work presents the estimation measurement setup based on the four-electrode technique. First, the complex impedance is estimated by three different estimation techniques: Fourier, Sine Correlation and Digital De-convolution and then estimation errors for the magnitude, phase, reactance and resistance are calculated and analyzed for different levels of disturbances in the observations. The absolute values of relative errors are plotted and the graphical performance of each technique is compared.
Journal of medical signals and sensors
Designing and implementing bioimpedance spectroscopy device by measuring impedance in a mouse tissue
2013 •
Ramin Soltanzadeh
Studies show that any complications including hemorrhage, lack of blood supply, lack of oxygen supply and death of cells in a tissue, will have a clear effect on electrical properties of that tissue. Thus, by measuring impedance of a set of tissues, potential problems of the damaged tissue may be found. Since electrical impedance is closely related to the measuring frequency, obviously, every tissue exhibits its own specific impedance according to its electrical properties at each frequency. This research project investigates design and manufacture method of a device for measuring tissue impedance at different frequencies. To this end, design of a multi frequency sinusoidal current source is required. This current source is built using a single harmonic Generator sample (Direct Digital Synthesizer AD9835) with working frequency (design-point frequency) between 1 Hz and 10 MHz and accuracy of 1 Hz and microcontroller (PIC16F628) capability. For measurement and display of tissue imped...
2013 E-Health and Bioengineering Conference (EHB)
The importance of measuring electrical impedance in the analysis of human physiological parameters
2013 •
Radu George Ciorap
International Journal of Engineering Research and Technology (IJERT)
IJERT-Measurement System for Bio-impedance Signal Analysis using Impedance Analyzer
2015 •
IJERT Journal
https://www.ijert.org/measurement-system-for-bio-impedance-signal-analysis-using-impedance-analyzer https://www.ijert.org/research/measurement-system-for-bio-impedance-signal-analysis-using-impedance-analyzer-IJERTV4IS070347.pdf Bio-Electrical Impedance shows the electrical properties of body which gives the provision to develop non-invasive system for bio-impedance measurement. Single lead sample failed to give proper information. Therefore this paper designs multi-lead system for getting more accurate results. The main aim of the proposed system is to observe volume which changes at the different location of body with respect to time using multi-electrodes. The present paper utilizes bio-impedance of body to analyze changes in real time. Impedance analyzer is used to develop the prototype. Multifrequency concept is applied for better accuracy. This prototype is tested on electrical models in order to reduce electrical interaction and frequency interference between the leads. The obtained result shows that the system reduces the error and gives better result for real life implementation. It is concluded that the present multilead system performs better with low power consumption with better accuracy.
