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Related Experiment Videos

A comparative study of several exciting magnetic fields for induced current EIT

N G Gençer1, Y Z Ider

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

Physiological Measurement
|May 1, 1994
PubMed
Summary

This study introduces an improved coil configuration for induced current electrical impedance tomography (IC-EIT). The new design enhances sensitivity to internal conductivity changes, producing imaging results comparable to injected current EIT.

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Area of Science:

  • Biomedical Engineering
  • Electrical Impedance Tomography (EIT)
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
  • Induced current EIT (IC-EIT) offers an alternative to traditional injected current EIT (IC-EIT).
  • Optimizing coil configurations is crucial for enhancing IC-EIT performance.

Purpose of the Study:

  • To investigate coil configuration parameters for IC-EIT using circular coils.
  • To propose an alternative coil configuration for more linear magnetic fields.
  • To compare the performance of the proposed IC-EIT method with conventional injected current EIT.

Main Methods:

  • Investigated coil radius and center shift for circular coils in IC-EIT.
  • Developed an alternative coil configuration producing approximately linear magnetic fields.

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  • Compared IC-EIT (two configurations) and injected current EIT using singular-value patterns, sensitivity distributions, and imaging performance.

    • Main Results:

    • The proposed alternative coil configuration demonstrated increased sensitivity to inner region conductivity perturbations.
    • Measurements from the alternative configuration were more sensitive than both injected current EIT and standard IC-EIT.
    • Images generated by the proposed IC-EIT method were comparable in quality to those from injected current EIT.

    Conclusions:

    • The alternative coil configuration significantly improves sensitivity in the central region for IC-EIT.
    • This optimized IC-EIT approach offers comparable imaging performance to injected current EIT.
    • The findings suggest potential for enhanced diagnostic capabilities with IC-EIT.