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Related Concept Videos

Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
Impedance Combination01:21

Impedance Combination

Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the voltage division...
Impedances and Admittance01:23

Impedances and Admittance

In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Current Density01:21

Current Density

The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...

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Related Experiment Video

Updated: Jul 17, 2026

Electric Cell-substrate Impedance Sensing for the Quantification of Endothelial Proliferation, Barrier Function, and Motility
12:30

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Published on: March 28, 2014

A new approach to current density impedance imaging.

K F Hasanov1, A W Ma, R S Yoon

  • 1Inst. of Biomater. & Biomed. Eng., Toronto Univ., Ont., Canada.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 3, 2007
PubMed
Summary

Current density impedance imaging (CDII) noninvasively reconstructs conductivity using MRI. This novel technique accurately determined sample conductivity within a phantom, demonstrating its potential for localized measurements.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Electrical Impedance Tomography

Background:

  • Current density impedance imaging (CDII) is an emerging technique.
  • It uses magnetic resonance imaging (MRI) for current density vector measurements.
  • Existing methods may lack localized conductivity information.

Purpose of the Study:

  • To introduce and validate the current density impedance imaging (CDII) technique.
  • To demonstrate noninvasive, localized conductivity reconstruction.
  • To assess CDII's accuracy using a conductivity phantom.

Main Methods:

  • Utilized magnetic resonance imaging (MRI) to measure current density vectors.
  • Applied a mathematical expression to calculate the gradient of the logarithm of conductivity (nabla ln(sigma)).
  • Reconstructed conductivity (sigma) through integration and a priori knowledge.

Main Results:

  • Accurate reconstruction of conductivity within a tissue-mimicking gel phantom.
  • Successful demonstration of localized conductivity calculation.
  • Validation of CDII's noninvasive measurement capability.

Conclusions:

  • CDII enables noninvasive, localized conductivity mapping.
  • The technique shows promise for various biomedical applications requiring conductivity imaging.
  • This study provides the first demonstration of CDII for sample conductivity calculation.