We analyze in which experimental conditions the concept of electrical impedance is useful for an electrolytic cell. The analysis is performed by solving numerically the differential equations governing the phenomenon of the redistribution of the ions in the presence of an external electric field and comparing the results with the ones obtained by solving the linear approximation of these equati...

Submit Manuscript | http://medcraveonline.com Abbreviations: CI, Cochlear implant; OR, Operating room; EI, electrode impedance; ECAP, electrically evoked compound action potential; SOE, spread of excitation; CT, computed tomography; DSP, digital signal processing; RF, radiofrequency transmitter; PC, personal computer; IR, Intra-operative; ESRTs, Electrical stapedil reflex thresholds, ECoh G, El...

The following conditions are optimal for obtaining an adequate number of informative images by electric impedance tomography: a) patient seated or standing with hands at the nape of the neck; b) breathing at rest; c) recording of at least 300 images (at a frequency of 10 Hz), and d) readings taken at the sixth intercostal space.

The biological active points (BAP) are known as low resistance spots or good electro-permeable points, have relativelower electric resistance than the surrounding tissues. In this study, a new method for BAP detection using the bio-impedance measurement system based on the adaptive frequency trackingfilter (AFTF) and the transition event detector is presented

In electrical impedance tomography (EIT) two-dimensional models continue to be applied despite their known inability to provide correct reconstruction. In this paper, a reconstruction algorithm that assumes a translationally invariant conductivity distribution is described. A more precise forward solver is obtained by taking off-slice currents into consideration. An appropriate sensitivity matr...

This paper aims to provide a method for using magnetic resonance electrical impedance tomography (MREIT) to visualize local conductivity changes associated with evoked neuronal activities in the brain. MREIT is an MRI-based technique for conductivity mapping by probing the magnetic flux density induced by an externally injected current through surface electrodes. Since local conductivity change...

The problem of minimizing the induced currents on an axially symmetric body by impedance loading is formulated by means of the Lorentz reciprocity ,,.^’ / ( ‘\ i. .,_. theorem. The currents in the gap where the tangential electric field is non-vanishing are carefully defined anli critically examined from the view point of field :heory.

Image Reconstruction in Electric Impedance Tomography (EIT) is an ill-posed problem. Ill-posedness affects the reconstruction in two ways: 1) the image is very sensitive to measurement noise, instrumentation and modeling errors 2) in order to reconstruct meaningful images regularization technique need to be used. This limits the ability to reconstruct sharp images. Traditionally image reconstru...

Small electrodynamic shakers are becoming increasingly popular for diagnostic investigations of the human vestibular system. More specifically, they are used as mechanical stimulators for eliciting a vestibular evoked myogenic potential (VEMP). However, it is largely unknown how shakers perform under typical measurement conditions, which considerably differ from the normal use of a shaker. Here...

The modeling of carbon nanotube ultracapacitor (CNU) performance based on the simulation of electrolyte ion motion between the cathode and the anode is described. Using a molecular dynamics (MD) approach, the equilibrium positions of the electrode charges interacting through the Coulomb potential are determined, which in turn yield the equipotential surface and electric field associated with th...