Microwave breast tumor detection and size estimation using contrast-agent-loaded magnetotactic bacteria

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Nanotechnology

Background:

• Magnetotactic bacteria (MTB) can be guided by external magnetic fields for targeted delivery within the body.
• MTB can be engineered to carry microwave contrast agents, altering local dielectric properties.
• Differential microwave imaging (DMI) offers a non-invasive method for tissue characterization.

Purpose of the Study:

• To develop a novel approach for breast tumor detection and localization.
• To utilize DMI-tracked, bio-compatible magnetotactic bacteria for cancer diagnostics.
• To assess the feasibility of this technique using an anatomically realistic breast model.

Main Methods:

• Guiding flagellated MTB using external magnetic fields for precise navigation.
• Loading MTB with microwave contrast agents to enhance detectability.
• Employing DMI techniques for simultaneous tracking and monitoring of multiple MTB agglomerations.
• Simulating the diagnostic technique on an anatomically realistic breast model.

Main Results:

• Demonstrated simultaneous tracking and monitoring of multiple MTB agglomerations within a breast model.
• Presented strategies for detecting, localizing, and estimating the size of simulated breast tumors.
• Verified the feasibility of the DMI-trackable bacterial propulsion and steering approach for breast cancer diagnosis.

Conclusions:

• The proposed method offers a novel, non-invasive technique for breast cancer detection and characterization.
• DMI-trackable bacterial microrobots show promise for advanced cancer diagnostics.
• This approach integrates magnetic guidance, targeted contrast agents, and advanced imaging for improved tumor detection.