Resolution Enhanced Distorted Born Iterative Method Using ROI Limiting Scheme for Microwave Breast Imaging

This paper presents a high-resolution inverse scattering approach using the distorted Born iterative method (DBIM) by utilizing a region-of-interest limitation scheme that assumes microwave breast cancer imaging modality. The DBIM-based tomography approach provides a quantitative dielectric profile, contributing to reliable cancer recognition, especially for dense breast media. However, if the inversion cell is small, the original DBIM will be inaccurate because the unknowns will far exceed the number of data samples. Thus, high-resolution reconstruction is a challenging issue and is not unique only to the DBIM. To address this difficulty, this paper introduces a region-of-interest (ROI)-limited scheme by developing low-resolution DBIM images. Numerical tests based on 2D FDTD demonstrate that the proposed approach provides high-resolution and accurate dielectric profiles for highly heterogeneous realistic phantoms.