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Assessment of errors in static electrical impedance tomography with adjacent and trigonometric current patterns
V Kolehmainen1, M Vauhkonen, P A Karjalainen
1Department of Applied Physics, University of Kuopio, Finland.
Physiological Measurement
|December 31, 1997
Summary
Static electrical impedance tomography (EIT) imaging requires absolute resistivity values, but errors in modeling, electrode placement, and contact impedance can affect reconstruction. This study simulates these errors to understand their impact on static EIT images.
Area of Science:
- Electrical Impedance Tomography (EIT)
- Computational Electromagnetics
Background:
- Difference imaging is common in EIT due to challenges in obtaining reliable absolute resistivity from static imaging.
- Absolute resistivity values are crucial for specific EIT applications.
Purpose of the Study:
- To simulate and analyze the impact of various error components on the reconstruction of static EIT images.
- To assess the influence of modeling errors, electrode inaccuracies, and contact impedance variations.
Main Methods:
- Two-dimensional simulations using the complete electrode model.
- Inclusion of errors such as boundary shape modeling errors, electrode size and localization errors, and contact impedance errors.
- Evaluation of adjacent and trigonometric current patterns.
Main Results:
- Demonstration of the effects of different error components on static EIT image reconstruction.
- Quantification of how modeling inaccuracies and electrode-related errors influence absolute resistivity estimates.
- Comparison of results obtained with different current patterns.
Conclusions:
- Understanding error propagation is vital for improving the accuracy of static EIT imaging.
- The study highlights the sensitivity of static EIT reconstructions to various error sources.
- Simulation-based analysis provides insights into mitigating reconstruction uncertainties in EIT.