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http://dx.doi.org/10.9718/JBER.2007.28.1.066

Multi-Frequency Electrical Impedance Tomography System  

Oh, Tong-In (Department of Biomedical Engineering College of Electronics and Information, Kyung Hee University)
Cho, Seong-Phil (Department of Biomedical Engineering College of Electronics and Information, Kyung Hee University)
Kim, Sang-Min (Department of Biomedical Engineering College of Electronics and Information, Kyung Hee University)
Koo, Hwan (Department of Biomedical Engineering College of Electronics and Information, Kyung Hee University)
Woo, Eung-Je (Department of Biomedical Engineering College of Electronics and Information, Kyung Hee University)
Publication Information
Journal of Biomedical Engineering Research / v.28, no.1, 2007 , pp. 66-74 More about this Journal
Abstract
We have developed a multi-channel, multi-frequency EIT system with operating frequency of 10Hz to 500KHz. The number of digital voltmeters using phase-sensitive demodulation can be varied from 8 to 64 and we found that 16 and 32-channels are most practical. This paper describes the design, implementation, and construction of 16 and 32-channel systems. The performance of the system was thoroughly tested and we found that CMRR of the developed voltmeter is about 85dB with $100{\Omega}$ unbalancing series resistor. The SNR is greater than 99.6dB and the output impedance of the constant current source is $1{\Omega}W$ at least for all frequencies. Imaging experiments using a banana with frequency-dependent conductivity and permittivity show that frequency-difference imaging is possible using the developed system. Future works of animal and human experiments are discussed.
Keywords
Multi-channel; multi-frequency; EIT(Electrical impedance tomography);
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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