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A review of errors in multi-frequency EIT instrumentation.

A McEwan1, G Cusick, D S Holder

  • 1Department of Medical Physics and Bioengineering, UCL, London, UK. a.mcewan@ucl.ac.uk

Physiological Measurement
|August 1, 2007
PubMed
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Multi-frequency electrical impedance tomography (MFEIT) shows promise for medical imaging but faces challenges. Addressing errors like stray capacitance is key for developing clinically accepted MFEIT systems.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Electrical Engineering

Background:

  • Multi-frequency electrical impedance tomography (MFEIT) has been explored for over a decade as a spectroscopic impedance imaging technique.
  • Despite the development of seven systems for imaging organs like the lung, heart, breast, and brain, none have achieved widespread clinical acceptance.
  • Significant instrumentation requirements exist for MFEIT systems to maintain a stable frequency response across a broad frequency range (DC-MHz) due to small physiological spectral changes.

Purpose of the Study:

  • To analyze the multi-frequency electrical impedance tomography (MFEIT) measurement problem.
  • To review solutions for common MFEIT challenges and revisit the architecture debate (four-terminal vs. two-terminal).
  • To identify major sources of error in MFEIT systems.

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Main Methods:

  • Described the EIT measurement problem from a multi-frequency perspective.
  • Considered solutions from recent MFEIT systems.
  • Analyzed sources of MFEIT errors, focusing on stray capacitance and common-mode voltages.

Main Results:

  • Identified stray capacitance and common-mode voltages as major error sources in MFEIT.
  • These errors cause a load-dependent frequency response in MFEIT systems.
  • Systems utilizing active electrodes demonstrated a greater ability to mitigate these errors.

Conclusions:

  • Active electrode systems are most effective in managing MFEIT errors.
  • A distributed system with electrode-level digitization is proposed as a future development direction for MFEIT.
  • Further advancements are needed to overcome current limitations and achieve clinical acceptance for MFEIT.