Abstract
The application of a recently introduced microwave imaging technique based on the Huygens principle (HP), has been extended to multilayered objects with inclusions in this paper. The methodology of HP permits the capture of contrast such that difierent material properties within the region of interest can be discriminated in the flnal image, and its simplicity removes the need to solve inverse problems when forward propagating the waves. Therefore the procedure can identify and localize signiflcant scatterers inside a multilayered volume, without having apriori knowledge on the dielectric properties of the target object. Additionally, an analytically-based approach for analyzing UltraWide Bandwidth (UWB) body propagation is presented, where the body is modeled as a 3-layer stratifled cylinder with an eccentric inclusion. Validation of the technique through both simulations and measurements on multilayered cylindrical objects with inclusions has been performed.
Highlights
Microwave imaging is an attractive and promising non-ionizing imaging modality for medical applications
We will describe the extension of a recently introduced UltraWide Bandwidth (UWB) microwave imaging technique based on the Huygens Principle [14] for treating multilayered objects with inclusions
We will first investigate analytically the propagation phenomena of UWB signal in human-like tissues; the body will be modeled as a 3-layer eccentric cylinder of infinite length, and Maxwell’s equations will be solved
Summary
Microwave imaging is an attractive and promising non-ionizing imaging modality for medical applications. We will first investigate analytically the propagation phenomena of UWB signal in human-like tissues (in contrast to conventional approaches based on Finite Difference Time Domain-FDTD methods); the body will be modeled as a 3-layer eccentric cylinder of infinite length, and Maxwell’s equations will be solved. In this paper, stratified cylinders involving at least 3 different layers are used as models in both simulations and measurements. Potential applications of this method include breast cancer detection, internal organ imaging, and whole body imaging. We consider a 3-layer stratified cylinder in free space, illuminated by a plane wave having a frequency f , with T M -polarization and normal incidence with respect to the z-axis. It should be noted that if the cylinder (Fig. 1) is illuminated by an electrical z-directed line source of intensity I, all the expressions which have been derived from the plane wave illumination can still be used by replacing (−j)n with Hn(2)(k0ρ0), where ρ0 represents the distance of the line source from the axis of the cylinder
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