An alternative excitation method for electrical impedance tomography.

Area of Science:

• Electrical Engineering
• Biomedical Imaging
• Signal Processing

Background:

• Electrical Impedance Tomography (EIT) relies on accurate current injection and voltage measurement circuits.
• Traditional push-pull current sources in EIT require frequent calibration, especially for frequency-swept measurements.
• The current source is a critical component influencing EIT measurement quality.

Purpose of the Study:

• To propose and validate an alternative excitation method for EIT instruments.
• To simplify the design of current sources in EIT systems.
• To achieve the performance of push-pull current sources using a single-ended approach.

Main Methods:

• Development of a novel single-ended current source for EIT.
• Numerical simulations to compare the proposed method with push-pull excitation.
• Investigation of reconstructed images to assess the effectiveness of the new excitation method.

Main Results:

• The proposed single-ended current source simplifies EIT hardware design.
• Reduced calibration requirements for the current source were observed.
• Numerical simulations confirmed that corrected measurements are consistent with push-pull excitation.
• Reconstructed images demonstrated the effectiveness of the proposed excitation method.

Conclusions:

• A simplified single-ended current source offers a viable alternative to push-pull designs in EIT.
• The proposed method enhances hardware simplicity and reduces calibration needs.
• This approach maintains the performance of EIT imaging, as validated by simulations and image reconstruction.