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We propose a correction to the conventional Rytov approximation (RA) and investigate its performance for predicting wave scattering under strong scattering conditions. An important motivation for the correction and investigation is to help in the development of better models for inverse scattering. The correction is based on incorporating the high-frequency theory of inhomogeneous wave propagation for lossy media into RA formulation. We denote the technique as the extended RA for lossy media (xRA-LM). xRA-LM significantly improves upon the existing noniterative linear scattering approximations such as RA and Born approximation (BA) by providing a validity range for the permittivity of objects of up to 50 times greater than RA. We demonstrate the technique by providing results for predicting wave scattering from piecewise homogeneous scatterers in a 2-D region. Numerical investigation of the performance of xRA-LM for solving direct problems show that xRA-LM can accurately predict wave scattering by electrically large, low-loss scatterers with high complex relative permittivity (<inline-formula> <tex-math notation="LaTeX">$\epsilon _{r}&gt; 50+5j$ </tex-math></inline-formula>). To the best of our knowledge, this is the first noniterative, linear approximate wave scattering model which has a large validity range in terms of both permittivity and electrical size.

A New Correction to the Rytov Approximation for Strongly Scattering Lossy Media