대한의용생체공학회:의공학회지 (Journal of Biomedical Engineering Research)

  • 제28권1호
  • /
  • Pages.66-74
  • /
  • 2007
  • /
  • 1229-0807(pISSN)
  • /
  • 2288-9396(eISSN)
대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
권호 표지
DOI QR코드

DOI QR Code

다주파수 임피던스 단층촬영 시스템

Multi-Frequency Electrical Impedance Tomography System

  • 오동인 (경희대학교 전자정보대학 동서의료공학과) ;
  • 조성필 (경희대학교 전자정보대학 동서의료공학과) ;
  • 김상민 (경희대학교 전자정보대학 동서의료공학과) ;
  • 구환 (경희대학교 전자정보대학 동서의료공학과) ;
  • 우응제 (경희대학교 전자정보대학 동서의료공학과)
  • 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)
  • 발행 : 2007.02.28
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

참고문헌

  1. D. Holder, ed., Electrical Impedance Tomography: Methods, History and Applications, IOP Publishing, Bristol, UK, 2005
  2. K. Boone, D. Barber and B. H. Brown, 'Imaging with electricity: report of the European concerted action on impedance tomography,' J. Med. Eng. Tech., vol. 21, pp. 201-232, 1997 https://doi.org/10.3109/03091909709070013
  3. T. I. Oh, S. M. Beak, J. S. Lee, E. J. Woo and C. J. Park, 'Development of prototype multi-channel digital EIT system with radially symmetric architecture,' J. Biomed. Eng. Res., vol. 26, pp. 215-221, 2005
  4. S. Franco, Design with Operational Amplifiers and Analog Integrated Circuits, 3rd. ed., McGraw-Hill, NY, 2002
  5. A. S. Ross, G. J. Saulnier, J. C. Newell, and D. Isaacson, 'Current source design for electrical impedance tomography,' Physiol. Meas., vol. 24, pp. 509-516, 2003 https://doi.org/10.1088/0967-3334/24/2/361
  6. B. Baker, Real Analog Solution for Digital Designers, Newnes, Oxford, 2005
  7. J. L. Mueller, D. Isaacson and J. C. Newell, 'A reconstruction algorithm for electrical impedance tomography data collected on rectangular electrode arrays,' IEEE Trans. Biomed. Eng., vol. 46, pp. 1379-1386, 1999 https://doi.org/10.1109/10.797998