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Open AccessArticle

A FPGA-Based Broadband EIT System for Complex Bioimpedance Measurements—Design and Performance Estimation

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Laboratory of Medical Electronics (LME), Lübeck University of Applied Sciences, 23562 Lübeck, Germany
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Graduate School for Computing in Medicine and Life Sciences, University of Lübeck, 23562 Lübeck, Germany
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Institute of Medical Engineering, University of Lübeck, 23562 Lübeck, Germany
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Center of Excellence CoSA (Communications—Systems—Applications), Lübeck University of Applied Sciences, 23562 Lübeck, Germany
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Authors to whom correspondence should be addressed.
Academic Editor: Ignacio Bravo-Muñoz
Electronics 2015, 4(3), 507-525; https://doi.org/10.3390/electronics4030507
Received: 5 May 2015 / Revised: 19 July 2015 / Accepted: 22 July 2015 / Published: 29 July 2015
Electrical impedance tomography (EIT) is an imaging method that is able to estimate the electrical conductivity distribution of living tissue. This work presents a field programmable gate array (FPGA)-based multi-frequency EIT system for complex, time-resolved bioimpedance measurements. The system has the capability to work with measurement setups with up to 16 current electrodes and 16 voltage electrodes. The excitation current has a range of about 10 µA to 5 mA, whereas the sinusoidal signal used for excitation can have a frequency of up to 500 kHz. Additionally, the usage of a chirp or rectangular signal excitation is possible. Furthermore, the described system has a sample rate of up to 3480 impedance spectra per second (ISPS). The performance of the EIT system is demonstrated with a resistor-based phantom and tank phantoms. Additionally, first measurements taken from the human thorax during a breathing cycle are presented. View Full-Text
Keywords: bioimpedance measurements; electrical impedance tomography; multi-frequency; chirp signal excitation; broadband impedance measurements bioimpedance measurements; electrical impedance tomography; multi-frequency; chirp signal excitation; broadband impedance measurements
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Kusche, R.; Malhotra, A.; Ryschka, M.; Ardelt, G.; Klimach, P.; Kaufmann, S. A FPGA-Based Broadband EIT System for Complex Bioimpedance Measurements—Design and Performance Estimation. Electronics 2015, 4, 507-525.

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