Indirect calculation of breast tissue impedance values

Area of Science:

• Biomedical Engineering
• Electrical Engineering
• Medical Physics

Background:

• Dielectric properties of biological tissues are crucial for medical imaging and diagnostics.
• Skin interference significantly affects low-frequency ( < 10 kHz) transimpedance measurements in non-invasive breast examinations.
• Accurate dielectric characterization of skin and subcutaneous tissue is essential for reliable diagnostic outcomes.

Purpose of the Study:

• To develop a novel method for overcoming skin interference in dielectric property measurements of living tissues.
• To enable accurate, non-invasive assessment of underlying tissue dielectric properties.
• To improve the diagnostic capabilities of transimpedance measurement devices for breast cancer detection.

Main Methods:

• Utilized multi-frequency transimpedance measurements with a surface current distribution from a flat probe.
• Analyzed the frequency-dependent variations in the real and imaginary parts of surface current density.
• Employed a two-layer geometric model (skin over tissue) with a thin upper skin layer.

Main Results:

• Successfully differentiated and quantified the dielectric properties of skin and underlying tissue.
• Demonstrated a method to overcome the screening effect of skin at low frequencies.
• Validated the potential for improved accuracy in breast cancer diagnosis.

Conclusions:

• The proposed multi-frequency measurement technique effectively isolates and quantifies dielectric properties of skin and underlying tissue.
• This method enhances the reliability of transimpedance measurements for non-invasive breast examinations.
• The findings support the application of this technique in existing devices for more accurate breast cancer diagnosis.