Spatial Domain Indirect Holography for Phaseless Microwave Imaging

The solution of inverse scattering problem arising in microwave imaging generally requires the knowledge of the incident field distribution inside the imaging domain. This task can be accomplished by sampling the whole imaging domain, but resulting into an inconvenient strategy. Alternatively, the incident field can be collected on the measurement domain only, by subsequently retrieving the required field distribution. In this contribution, a two-step phaseless strategy for the prediction of the incident field distribution is presented. Starting from the intensity knowledge of the incident field on the measurement domain, the corresponding phase is retrieved by applying a Spatial Domain Indirect Holography Technique. The retrieved complex incident field is then exploited within a Modal Expansion formulation for the incident field reconstruction inside the imaging domain. The validity of this combined approach is tested within a phaseless inverse scattering strategy, where intensity-only data relative to the total field are assumed to be sampled. The effectiveness of the proposed solution is demonstrated through validation on a breast imaging scenario.