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Related Concept Videos

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...
RLC Series Circuits: Impedance01:29

RLC Series Circuits: Impedance

When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining the performance of AC circuits. It is represented by Z, which is a combination of resistance and reactance, and depends upon the angular frequency, measured in ohms.
Thus, the magnitude of the impedance is given by the following equation,
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...
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...
Boundary Conditions for Current Density01:25

Boundary Conditions for Current Density

Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
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...

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Related Experiment Video

Updated: Jul 2, 2026

Electric Cell-substrate Impedance Sensing for the Quantification of Endothelial Proliferation, Barrier Function, and Motility
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Published on: March 28, 2014

Current density impedance imaging.

Karshi F Hasanov1, Angela W Ma, Adrian I Nachman

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8 Canada.

IEEE Transactions on Medical Imaging
|August 30, 2008
PubMed
Summary
This summary is machine-generated.

Current density impedance imaging (CDII) noninvasively maps conductivity using magnetic resonance imaging. This novel technique, validated with phantoms, accurately images internal conductivity distributions.

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Noninvasive measurement of internal conductivity distributions is crucial for various applications.
  • Existing impedance imaging techniques have limitations in resolution and accuracy.
  • Magnetic Resonance Imaging (MRI) offers a platform for advanced imaging modalities.

Purpose of the Study:

  • To introduce and validate a novel impedance imaging technique called Current Density Impedance Imaging (CDII).
  • To demonstrate the capability of CDII to noninvasively measure conductivity distributions within a medium.
  • To establish the accuracy and reliability of CDII through experimental validation.

Main Methods:

  • CDII utilizes current density vector measurements obtained via MRI.
  • The technique relies on the mathematical relationship: Δσ/σ = Δ(ln σ).
  • Images of conductivity (σ) are reconstructed by integrating the conductivity gradient (Δ(ln σ)) using two methods, incorporating boundary conductivity information.

Main Results:

  • CDII successfully generated conductivity images from three different phantoms.
  • Experimental validation confirmed the accuracy of CDII results against LCR meter measurements.
  • The technique demonstrated noninvasive measurement of conductivity distributions.

Conclusions:

  • CDII is a viable and accurate method for noninvasive conductivity imaging.
  • The integration of MRI with CDII provides a powerful tool for characterizing internal conductivity.
  • Further research can explore CDII's application in diverse biomedical and industrial fields.