Pedro Bertemes-Filho

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Multi-frequency electrical impedance tomography (EIT) systems require stable voltage controlled current generators that will work over a wide frequency range and with a large variation in load impedance. In this paper we compare the performance of two commonly used designs: the first is a modified Howland circuit whilst the second is based on a current(More)
Bioimpedance Spectroscopy (BIS) Analysis is a method used to characterize biological materials. Many BIS systems consist of applying a multi-frequency sinusoidal current of constant amplitude in the material and measuring the resulting potential to calculate the transfer impedance. It is necessary to assure that the injecting current has constant amplitude(More)
The use of an amplitude/phase retrieval algorithm in electrical bioimpedance spectroscopy (EIS) that allows a new technique to reconstruct the impedance spectrum in the frequency-domain is reported. To the authors' knowledge this is the first time the proposed algorithm has been used to calculate the modulus or phase of a bioimpedance in EIS from one of(More)
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