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Microwave Imaging Using Spectral Expansion of the Object Function

A novel imaging method for the permittivity distribution in biological tissues is presented. It allows for the simultaneous reconstruction of real and imaginary parts of the permittivity and is applicable to strong scatterers and media with losses as high as in most biological tissues. The method is based on the spectral expansion of the permittivity function in the material under test. Availability is demonstrated on simulation results and actual measurement data. The necessary adaptations and the application of the new method in non-TEM structures such as waveguides are described and verified. The method showed very good accuracy and excellent stability in all cases.