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Related Concept Videos

Bode Plots Construction01:24

Bode Plots Construction

The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
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...

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Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation
08:41

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Published on: October 10, 2018

Tissue characterization using electrical impedance spectroscopy data: a linear algebra approach.

Shlomi Laufer1, Stephen B Solomon, Boris Rubinsky

  • 1Research Center for Bioengineering in the Service of Humanity and Society, School of Computer Science and Engineering, Hebrew University of Jerusalem, Israel. Shlomi.laufer@mail.huji.ac.il

Physiological Measurement
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a new mathematical method for electrical impedance spectroscopy to identify surrounding tissue during minimally invasive procedures. This technique offers real-time tissue characterization, potentially reducing the need for advanced imaging.

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Published on: March 28, 2014

Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Electrical Engineering

Background:

  • Minimally invasive procedures require accurate real-time tissue identification.
  • Current imaging techniques like CT and MRI can be costly and time-consuming.
  • Electrical Impedance Spectroscopy (EIS) offers a non-invasive method for tissue characterization.

Purpose of the Study:

  • To develop a novel linear algebra manipulation for EIS measurements.
  • To provide real-time information about the tissue surrounding a needle during minimally invasive procedures.
  • To characterize tissue inhomogeneity without prior knowledge of electrical properties.

Main Methods:

  • Utilized a Comsol Multiphysics three-dimensional model.
  • Employed phantom studies using ex vivo animal tissue.
  • Incorporated in vivo animal data.
  • Applied a new linear algebra manipulation to EIS data.

Main Results:

  • Demonstrated successful characterization of tissue inhomogeneity.
  • Showcased the ability to differentiate tissues without prior electrical property knowledge.
  • Validated the method across different models and data types.

Conclusions:

  • The developed mathematical approach provides real-time tissue information during minimally invasive procedures.
  • This method has potential applications in needle biopsies, radiation seed placement, and minimally invasive surgery.
  • The technique may reduce reliance on conventional imaging modalities, improving efficiency and potentially lowering costs.