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We proposed a new spectral approach to the self-adjoint computation of the response Jacobian. It is designed to work with time-domain EM simulators thereby producing the Jacobian in a very wide frequency band. The new sensitivity formula operates on the spectral components of the E-field rather than on its time waveforms. The memory requirement is reduced by two to three orders of magnitude in comparison...
Gradient-based iterative algorithms are preferred in microwave tomography due to their fast convergence despite the fact that the solution is only local. The drawback is that response Jacobians are not available with current commercial electromagnetic solvers and reconstruction algorithms have to be equipped with in-house codes specifically designed to produce response derivatives in addition to the...
Forward electromagnetic (EM) solutions must be sufficiently accurate in order to be used in the solution of the inverse problem of microwave medical imaging. Two well-known issues related to the adequacy of the forward EM solutions are: 1) the feasibility of 2-D approximations and 2) the effect of the skin interface. In this paper, we present a systematic study using the time-domain EM solver XFDTD...
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