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A dual-frequency electrical impedance tomography system.

H Griffiths·Z Zhang
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Abstract

An electrical impedance tomography (EIT) system has been constructed, operating at two frequencies, 40.96 and 81.92 kHz, for investigating the practicability of the dual-frequency imaging method discussed theoretically in a previous paper. For testing the system, a phantom with a frequency-dependent electrical conductivity was designed. The properties of the phantom can be adjusted to match the frequency dependence observed in a given type of tissue. Dual-frequency images were obtained from a phantom simulating liver and also from 200 g of porcine liver in a saline tank. Prior to image reconstruction, it was necessary to apply a correction to the data to cancel the effects of stray capacitance within the electronics.

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AnimalsElectric ConductivityHumansLiverMammalsModels, StructuralSwineTomographyJournal ArticleResearch Support, Non-U.S. Gov't

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H Griffiths, Z Zhang. 1989. A dual-frequency electrical impedance tomography system.. https://doi.org/10.1088/0031-9155%2F34%2F10%2F009

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