Estimation of the center and the size of a dielectric cylinder by using the angular mode representation of scattered fields

Inverse scattering is popular for remote sensing, nondestructive testing, medical imaging, etc. Diffraction tomography and the Born iterative method based on the Born approximation give good reconstruction results for a low-contrast object. For a high-contrast object, iterative inversion is widely used. It is important to know the center and the size of a dielectric cylinder in inverse scattering, especially iterative inversion. We show that the center and the size of a dielectric cylinder may be related to the number of effective angular modes from the angular mode representation of scattered fields. We propose a method estimating the center and the size of a dielectric cylinder by using the effective angular modes.