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Related Experiment Videos

Electrical impedance tomography: induced-current imaging achieved with a multiple coil system

N G Gençer1, Y Ziya, S J Williamson

  • 1Department of Physics, New York University, New York 10003, USA. gencer@galvani.physics.nyu.edu

IEEE Transactions on Bio-Medical Engineering
|February 1, 1996
PubMed
Summary

Using more induction coils in electrical impedance tomography (EIT) improves image quality by increasing measurements. A six-coil system offers better resolution and localization of conductivity changes compared to a three-coil system.

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Area of Science:

  • Medical Imaging
  • Electrical Engineering
  • Applied Physics

Background:

  • Electrical impedance tomography (EIT) is a non-invasive imaging technique.
  • Image reconstruction in EIT is an inverse problem sensitive to measurement noise.
  • Optimizing coil configuration is crucial for enhancing EIT image quality.

Purpose of the Study:

  • To experimentally evaluate the impact of increasing induction coils on EIT image quality.
  • To compare the performance of a six-coil system against a three-coil system.
  • To determine the optimal parameters for noise reduction and resolution enhancement in EIT.

Main Methods:

  • An experimental setup using induced-current EIT with 16 electrodes was developed.
  • Image reconstruction was performed using the truncated pseudoinverse algorithm.

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  • Data from three and six induction coils were analyzed and compared.
  • The signal-to-noise ratio was established at 58 dB by optimizing the truncation index.

    • Main Results:

    • The six-coil system significantly enhanced image quality, revealing accurate sizes and locations of conductivity perturbations.
    • The six-coil system successfully imaged conductivity perturbations in the central object region.
    • The three-coil system could identify peripheral perturbations but showed location and size distortions centrally.
    • Increased coil number improved independent measurements but heightened sensitivity to noise.

    Conclusions:

    • Employing six induction coils in EIT demonstrably improves image quality over a three-coil system.
    • The six-coil system provides superior localization and size accuracy for conductivity perturbations.
    • While the three-coil system has limitations in central imaging, it can detect peripheral anomalies.