Imaging the breast with EIS: an initial study of exam consistency.

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Electrical Engineering

Background:

• Electrical impedance spectroscopy (EIS) shows promise for breast imaging in detecting abnormalities.
• Ensuring exam consistency and repeatability is crucial for reliable EIS breast imaging.
• Current systems need evaluation for their ability to provide consistent results.

Purpose of the Study:

• To assess the consistency and repeatability of EIS breast imaging.
• To quantify image variability under different electrode placement conditions.
• To evaluate the impact of electrode placement uncertainty on EIS breast imaging results.

Main Methods:

• Conducted a study involving imaging 25 breasts with varying electrode placement uncertainty.
• Employed single-placement, multiple-placement, single-session, and multiple-session imaging protocols.
• Utilized visual analysis and mean squared difference (MSD) measures for quantitative comparisons of permittivity and conductivity images.
• Described a novel breast interface designed for improved electrode positioning accuracy.

Main Results:

• Image variability increased with greater electrode placement uncertainty.
• Quantitative MSD analysis revealed average MSDs below 1% for single placements.
• MSDs were around 2-3% for same-session repositioning and approximately 15% for multi-session re-examinations.
• Demonstrated a strong correlation between electrode placement accuracy and image consistency.

Conclusions:

• EIS breast imaging can be consistent and repeatable.
• Precise electrode placement, typically within 1 cm accuracy, is essential for reliable EIS breast exams.
• The developed breast interface facilitates improved electrode positioning for enhanced consistency.
• These findings support the clinical viability of EIS for breast imaging applications.