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KMID : 1137820070280010066
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의공학회지
2007 Volume.28 No. 1 p.66 ~ p.74
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Multi-Frequency Electrical Impedance Tomography System
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Oh Tong-In
Cho Seong-Phil
Kim Sang-Min
Koo Hwan
Woo Eung-Je
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Abstract
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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.
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KEYWORD
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Multi-channel, multi-frequency, EIT(Electrical impedance tomography
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