Capacitively Coupled Phase-based Dielectric Spectroscopy Tomography.

Area of Science:

• Electrical Engineering
• Biomedical Imaging
• Electromagnetics

Background:

• Impedance imaging non-intrusively reconstructs dielectric parameters.
• Electrical impedance tomography (EIT) is common but requires direct electrode contact.
• Phase information in impedance measurements is often overlooked.

Purpose of the Study:

• To present a novel, contactless impedance imaging method using capacitive coupling.
• To investigate capacitively coupled electrical phase spectroscopy for dielectric parameter imaging.
• To explore the potential of phase measurements in non-invasive imaging.

Main Methods:

• Utilized a 12-electrode capacitively coupled test phantom and measurement system.
• Acquired phase measurements across a wideband frequency range (200 kHz to 15 MHz).
• Employed simulation for forward modeling and total variation algorithm for image reconstruction based on phase data.

Main Results:

• Demonstrated a novel method for contactless dielectric parameter imaging.
• Successfully reconstructed images using phase measurements from capacitively coupled spectroscopy.
• Investigated background data with varying conductivity levels, indicating broad applicability.

Conclusions:

• Capacitively coupled electrical phase spectroscopy is a viable technique for contactless impedance imaging.
• Phase data offers unique advantages for non-invasive dielectric parameter reconstruction.
• The method shows potential for diverse applications, though challenges remain.