Scattering of a pulsed beam by cylindrical targets in a tomographic layout

An approach to study the scattering of a pulsed and spatially nonuniform field, by a set of dielectric cylinders, is presented. Cylinders are embedded in a semi-infinite medium and source field is impinging from an outside region. Source field is expressed through its space and time spectra, and solution is developed with the frequency-domain Cylindrical Wave Approach, applied to a discretized spectrum of monochromatic plane-wave sources, with amplitude belonging to a Gaussian waveform. Time-domain dependence of the scattered field is reconstructed through an inverse Fast Fourier Transform. The method has interesting applications in the modelling of the scattering by inclusions, like small vessels or fibers, in biological tissues, for the diagnostic at THz and optical frequencies. Simulated radargrams provided useful information on the physical properties of the targets, and data useful for the understanding the image formation.