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This paper presents a novel approach to the detection of tumors of size well below a centimeter using a sub-wavelength ultrawide band (UWB) microwave radar imaging technique. Our approach exploits the principle of phase-shifting mask (PSM) and is implemented using a time-reversal (TR) algorithm based on the transmission-line matrix (TLM) method. A 0.5-mm diameter tumor was detected and located using...
Recently, a self-adjoint method was proposed for the computation of network parameter sensitivities. Here, we propose a modification to this method, which practically eliminates its overhead by using the Broyden update for the computation of the system matrix derivatives. We investigate the feasibility and the efficiency of the Broyden-update self-adjoint sensitivities in gradient based optimization...
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