The Transactions of the Korean Institute of Electrical Engineers D (대한전기학회논문지:시스템및제어부문D)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Adaptive Noise Subtraction in Auditory Evoked Field

적응 필터를 이용한 청각 자극에 의한 뇌자도 신호에서 노이즈 제거

  • Published : 2003.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

Noise subtraction using reference channel data has been used to improve signal-to-noise ratio in magnetoencephalography. In this paper, an adaptive noise subtraction model is proposed and parameters for the model are optimized. A criterion to determine an optimal update period for the filter coefficients is proposed based on the ratio of peak amplitude of evoked field (N100m) divided by the output standard deviation. Experiments are carried out using a 40 channel MEG system. From the experiments, the proposed noise subtraction method shows superior performances over existing non-adaptive methods. Two-dimensional topographic map is shown for a diagnosis with a cubic spline interpolation.

Keywords

References

  1. M. Hamalainen, R. Hari, R. J. llmoniemi, and O. V. Lounasmaa, 'Magnetoencephalography-theory, instrumentation, and applications to noninvasive studies of the working human brain,' Rev. Modem Phys., vol. 65, pp 413-497, 1993 https://doi.org/10.1103/RevModPhys.65.413
  2. H. J. Wieringga, 'MEG, EEG and the integration with Magnetic Resonance Images,'Twente Univ. Press, Enschede, 1993
  3. T. Kobayashi, and S. Kuriki, 'Principle Component elimination method for improvement of SIN in evoked neuromagnetic field measurements', IEEE Trans. Biomed. Eng., vol 46, pp.951-958, 1999 https://doi.org/10.1109/10.775405
  4. H. Ishibashi, M. Kawakastu, M. Adachi, and M. Kodani, 'A basic investigation of noise reduction for MEG data using independent component analysis based on correlation function', Proc. of the Biomag 2000, pp. 861-864, Espoo, Finland, 2000
  5. J. Vrba, J. McCubbin, S. Lee, and M. B. Burbank, 'Environmental Noise Cancellation for Biomagnetic Measurements', Advances in Biomagnetism, pp.721-724, Plenum Press, New York, 1992
  6. S. E. Robinson, 'Noise Cancellation in Biomagnetometers', Advances in Biomagnetism, pp.733-736, Plenum Press, New York, 1992
  7. C. B. Ahn, D. H. Lee, Y H. Lee, and J B. Hong, 'Development of a New Signal Processing System for 40 Channel MEG Mapping System', Proc. 4th Asia Pacific conf. Med. &Bio. Eng., p.236, Seoul, Korea, 1999
  8. 이용호, 김진목, 권혁찬, 박용기, 박종철, 이동훈, 안창범, '뇌자도 측정을 위한 40채널 SQUID 시스템 개발', 의공학회지, 21권1호, pp.31-37, 2000
  9. B. Widrow, S. Steams, 'Adaptive Signal Processing', Pentice-Hall Press, Upper Saddle River, NJ, 1985
  10. C.B. Ahn, D.H. Lee, W.C. Shin, H.C. Kwon, and Y.H. Lee, 'Adaptive noise subtraction for measurement of evoked field with various models and adaptation parameters,' Proc. of the Biomag2000, pp.887-890, Espoo, Finland, 2000
  11. 이동훈, 안창범, '적응 차감 방감의 파라미터 최적화에 따른 유발자계 신호의 신호대 잡음비 향상', 대한의용 생체공학회 춘계학술대회 논문집, p.61, 2003
  12. 이동훈, 신원창, 이용호, 안창범, '40채널 뇌자도 시스템 에서 적응필터를 이용한 노이즈 제거', 대한전기학회 하계학술대회 논문집, pp.3213-3215, 2000