Time-domain reconstruction using sensitivity coefficients for limited view ultrawide band tomography

Area of Science:

• Electromagnetic theory
• Imaging science
• Applied physics

Background:

• Electromagnetic tomography is crucial for non-invasive imaging.
• Accurate reconstruction of object properties from electromagnetic pulse arrivals is challenging.

Purpose of the Study:

• To develop and validate a time-domain ultrawide band (UWB) electromagnetic tomography method.
• To reconstruct spatial characteristics and electromagnetic properties of objects.

Main Methods:

• Utilized the finite-difference time-domain (FDTD) method with a perfectly matched layer (PML) for solving the forward problem.
• Employed a linearized update and regularized Landweber minimization algorithm for image reconstruction.
• Collected experimental data using a laboratory UWB system in aqueous media.

Main Results:

• Successfully determined system sensitivity maps from the forward problem solutions.
• Demonstrated accurate detection and localization of targets with varying contrasts, sizes, and shapes.
• Showcased the technique's robustness against significant noise levels in experimental data.

Conclusions:

• Time-domain UWB electromagnetic tomography is effective for imaging unknown objects.
• The proposed reconstruction algorithm provides accurate spatial and property distribution information.
• The method shows promise for practical applications despite data noise.