A fast and efficient microwave tomographic algorithm is proposed for 2-D and 3-D real-time intrawall imaging. The exploding\nreflection model is utilized to simplify the imaging formulation, and the half-space Green�s function is expanded in the spectral\ndomain to facilitate the easy implementation of the imaging algorithm with the fast Fourier transform (FFT) and inverse fast\nFourier transform (IFFT). The linearization of the inversion scheme and employment of FFT/IFFT in the imaging formula\nmake the algorithm suitable for various applications pertaining to the inspection of a large probed region and allow real-time\nprocessing. Representative numerical and experimental results are presented to show the effectiveness and efficiency of the\nproposed algorithm for real-time intrawall characterization
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