Multi-frequency static imaging in electrical impedance tomography: Part 1. Instrumentation requirements

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Electrical Engineering

Background:

• Electrical impedance tomography (EIT) is a non-invasive imaging technique.
• Static images can be acquired by measuring electrical impedance at multiple frequencies.
• Tissue impedance varies with frequency, influencing EIT system design.

Purpose of the Study:

• To analyze the feasibility of building an EIT instrument for static imaging.
• To determine instrument specifications based on tissue impedance models.
• To identify potential instrument errors and their impact on image quality.

Main Methods:

• Analysis of available data and theoretical models for tissue impedance.
• Calculation of expected impedance and boundary voltage changes.
• Evaluation of instrument errors from various sources.
• Determination of design parameters for critical instrument components.

Main Results:

• The analysis confirms the possibility of constructing an EIT instrument with acceptable error levels for static imaging.
• Expected impedance and boundary voltage changes were calculated to guide instrument specifications.
• Potential sources of instrument error were identified and analyzed.
• Design considerations for critical components were indicated.

Conclusions:

• It is feasible to build an EIT instrument capable of producing static images with limited errors.
• Technological challenges were encountered in building a prototype instrument.
• Further development is needed to overcome technological limitations for optimal performance.