On-chip electrical impedance tomography for imaging biological cells

Area of Science:

• Biomedical Engineering
• Electrical Engineering
• Cell Biology

Background:

• Electrical impedance tomography (EIT) is a valuable imaging technique for characterizing electrical properties.
• Current EIT systems often lack miniaturization and cell-specific resolution.
• Developing non-invasive methods for analyzing cellular electrical properties is crucial for diagnostics.

Purpose of the Study:

• To present a miniaturized EIT system for imaging electrical conductivity in 2D cell cultures.
• To demonstrate the system's capability for non-invasive imaging of single cells.
• To explore the potential of this technology for diagnostic and clinical applications.

Main Methods:

• Fabrication of a 16-electrode array chip using printed circuit board technology.
• Utilizing an impedance analyzer for signal stimulation and voltage data acquisition.
• Employing EIDORS open-source software and finite element modeling for image reconstruction.

Main Results:

• Successfully reconstructed images of electrical conductivity distribution in a 2D cell culture.
• Demonstrated the first impedance imaging of the single cellular organism, Physarum Polycephalum.
• Analyzed the impact of regularization parameters and noise on image reconstruction fidelity.

Conclusions:

• The developed miniaturized EIT system offers a non-invasive lab-on-a-chip solution for mapping cellular electrical properties.
• This technology represents a significant advancement towards impedance imaging of single cells in culture.
• The system holds promise for future diagnostic and clinical applications in cell analysis.