Tissue-Type Imaging for Ultrasound-Prior Microwave Inversion

In this paper we show results of applying the composite tissue-type imaging method to reconstructions of ultrasound-guided microwave inversions. Structural prior information about the object-of-interest undergoing quantitative microwave imaging is provided to the microwave inversion algorithm via an ultrasound ray-based imaging technique that utilizes a qualitative delay-and-sum method followed by K-means segmentation. The resulting segmented image is utilized as an inhomogeneous numerical background for the microwave finite-element Contrast Source Inversion algorithm. This prior information improves the reconstruction of the complex permittivity. Subsequently, the recently derived composite tissue-type imaging technique, which produces a tissue-type map along with a corresponding probability image, is applied to the reconstructed complex permittivity images.