ELECTROMAGNETIC INVERSE-SCATTERING SOLUTIONS FOR INHOMOGENEOUS CROSS-SECTIONS OF CYLINDRICAL BIOLOGICAL BODIES BY A MODIFIED BORN APPROXIMATION AND A STOCHASTIC MARKOV RANDOM-FIELDS APPROACH

Two novel methods of microwave imaging for biomedical applications are presented and discussed. The first is a deterministic method based on a modified Born approximation; it extends the validity of the usual B orn approximation to strongly scattering bodies. The second is a stoch astic method that leads to a Bayesian solution to the nonlinear proble m of inverse scattering by modelling the dielectric;properties of a sc atterer and the electric field as suitable Markov random fields. Both methods exhibit the major feature of easily exploiting a priori knowle dge, which can be available in many biomedical applications. Numerical results are reported to show the effectivenesses of the two methods.