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Electrical impedance tomography using induced and injected currents.

N G Gençer1, Y Z Ider, M Kuzuoglu

  • 1Electrical and Electronics Engineering, Middle East Technical University, Ankara, Turkey.

Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Fur Medizinische Physik and the European Federation of Organisations for Medical Physics
|January 1, 1992
PubMed
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This study presents a new method for electrical impedance tomography (EIT) using induced currents, improving image reconstruction accuracy. Combining induced and injected current methods enhances measurement capabilities for better conductivity imaging.

Area of Science:

  • Electrical Impedance Tomography (EIT)
  • Computational Electromagnetics
  • Medical Imaging Physics

Background:

  • Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
  • Traditional EIT methods often rely on injected currents, which can have limitations.
  • Understanding the forward and inverse problems is crucial for accurate EIT reconstruction.

Purpose of the Study:

  • To introduce a novel two-dimensional forward problem formulation for EIT using induced currents.
  • To develop a linearised inverse problem formulation for EIT with induced currents.
  • To compare the performance of induced current EIT with traditional injected current EIT.

Main Methods:

  • Linearisation of the forward problem around a known resistivity distribution.

Related Experiment Videos

  • Formulation of the inverse problem as a linear system of equations.
  • Analysis of boundary measurement sensitivity to resistivity variations.
  • Application of generalised inversion for image reconstruction.
  • Development of a similar inverse problem formulation for injected current EIT.
  • Simulation studies comparing both EIT methods.

    • Main Results:

    • A functional two-dimensional forward problem formulation for induced current EIT was established.
    • Sensitivity analysis revealed insights into measurement responses for different field types.
    • Image reconstruction was performed using generalised inversion for both induced and injected current EIT.
    • The study demonstrated that combining formulations for both methods increases the number of independent measurements.

    Conclusions:

    • The proposed induced current EIT formulation is effective for imaging conductivity distributions.
    • Combining induced and injected current EIT methods offers advantages in terms of data acquisition and reconstruction.
    • This work provides a foundation for advanced EIT techniques with improved resolution and accuracy.