Abstrakt

W artykule przedstawiono wpływ wyboru składowych częstotliwościowych dla różnicowej tomografii impedancyjnej na wynik i własności obrazowania w dwuczęstotliwościowej różnicowej tomografii impedancyjnej.A Dual Frequency EIT is an extension of a traditional EIT that uses two sinusoidal signals for imaging. Appropriate selection of signals' frequency allows to achieve reasonable contrast of imaged structure. It has already been shown that frequency of the signals should cover a selected dispersion range (usually a beta dispersion) for living biological objects. Thus, in respect to dierent application the upper frequency may achieve (or at least it should achieve) a relatively large values. The upper limit of frequency used in DFEIT is considered in paper. An application of Laplace equation for solving of the forward model as well for a sensitivity calculation is veried and Maxwell equations are suggested for high frequency component.However, there is a limitation in increasing frequency resulting from current leakages and hardware properties. Increasing frequency above a certain one, determined both by object and measurement system properties, is worthless. A current-to-potential and a potential-to-current mappings were compared from a perspective of achievable properties of existing hardware solutions. The comparison was made using SPICE simulations. Additionally, the coupling between object and environment was considered for the high frequency component.

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