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2014 | OriginalPaper | Chapter

A Low Cost Electrical Impedance Tomography (EIT) Instrumentation for Impedance Imaging of Practical Phantoms: A Laboratory Study

Authors : Tushar Kanti Bera, J. Nagaraju

Published in: Proceedings of the Third International Conference on Soft Computing for Problem Solving

Publisher: Springer India

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Abstract

A low cost Electrical Impedance Tomography (EIT) instrumentation is developed for studying the impedance imaging of practical phantoms. The EIT instrumentation is developed with a constant current injector, signal conditioner block and a DIP switch based multiplexer module. The constant current injector consists of a variable frequency Voltage Controlled Oscillator (VCO) and a modified Howland based Voltage Control Current Source (VCCS). The signal conditioner block is made up of an instrumentation amplifier (IAmp), a 50 Hz notch filter (NF) and a narrow band pass filter (NBPF) developed by cascading one lowpass filter and a highpass filter. The electrode switching module is developed using DIP switch based multiplexers to switch the electrodes sequentially for injecting current and measuring the boundary voltage data. Load response, frequency response and the Fast Fourier Transform (FFT) studies are conducted to evaluate the VCO, VCCS, IAmp, NF and NBPF performance. A number of practical phantoms are developed and the resistivity imaging is studied in EIDORS to evaluate the instrumentation. Result shows that the instrumentation is suitable for laboratory based practical phantom imaging studies.

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previous chapter Generalized Second-Order Duality for a Class of Nondifferentiable Continuous Programming Problems

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Title: A Low Cost Electrical Impedance Tomography (EIT) Instrumentation for Impedance Imaging of Practical Phantoms: A Laboratory Study
Authors: Tushar Kanti Bera
J. Nagaraju
Publisher: Springer India
Book: Proceedings of the Third International Conference on Soft Computing for Problem Solving
Print ISBN: 978-81-322-1767-1

Electronic ISBN: 978-81-322-1768-8

Copyright Year: 2014
DOI: https://doi.org/10.1007/978-81-322-1768-8_60

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