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The ACE1 Electrical Impedance Tomography System for Thoracic Imaging.

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The Active Complex Electrode (ACE1) system enables electrical impedance tomography using single-ended voltage measurements. It reconstructs conductivity and permittivity images from phantom and human subject data.

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
  • Accurate conductivity and permittivity measurements are crucial for EIT.
  • Single-ended measurements present unique hardware and calibration challenges.

Purpose of the Study:

  • To present the design and performance of the ACE1 system for EIT.
  • To demonstrate the system's capability for single-ended phasic voltage measurements.
  • To validate the reconstruction of conductivity and permittivity images.

Main Methods:

  • Design of the ACE1 active electrode circuit for amplitude and phase measurement.
  • Development of hardware and calibration procedures for image reconstruction.
  • Evaluation of system performance using signal-to-noise ratio and demodulation analysis.

Main Results:

  • The ACE1 system successfully performs single-ended phasic voltage measurements.
  • Calibration procedures enable accurate conductivity and permittivity image reconstruction.
  • Static and dynamic images were generated from phantom and human subject data.

Conclusions:

  • The ACE1 system is a viable tool for electrical impedance tomography.
  • The system demonstrates utility in reconstructing conductivity and permittivity images.
  • Further applications in medical imaging and diagnostics are suggested.