RECONSTRUCTION OF DIELECTRIC PERMITTIVITY DISTRIBUTIONS IN ARBITRARY 2-D INHOMOGENEOUS BIOLOGICAL BODIES BY A MULTIVIEW MICROWAVE NUMERICAL-METHOD

In this paper, a numerical method for microwave imaging of two-dimensi onal inhomogeneous biological bodies illuminated by TM waves is presen ted. It is a spatial-domain multiview approach which makes use of the moment method to discretize the integral-equation formulation of inver se scattering. A pseudoinversion technique is applied to obtain a mini mum-norm solution for the equivalent current density inside the cross- section of a scatterer. A multi-illumination-angle multiview process i s used. The invariance of the Green matrix makes it possible to perfor m only one pseudoinverse (off line and once for all), independently of the number of views, thus reducing the need for computer resources. A pixel representation is adopted, and a look-up table is utilized to f ast synthesize images. No plane-wave illumination is required and no f irst-order approximations are applied. Distortions in the dielectric r econstruction and noise effects are evaluated via some numerical simul ations.