Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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The Influence of the Number of Electrodes, the Position and Direction of a Single Dipole on the Relation Between S/N ratio and EEG Dipole Source Estimation Errors

뇌전위의 단일 쌍극자 모델에서 전극의 개수, 쌍극자의 위치 및 방향이 S/N과 쌍극자 추정 오차사이의 관계에 미치는 영향에 관한 시뮬레이션 연구

  • 김동우 (한국과학기술원 물리학과) ;
  • 배병훈 (한국과학기술원 물리학과, 카멘 전자중앙연구소)
  • Published : 1994.03.01
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Abstract

In the source localization using single dipole model, the influence of the number of electrodes, the position and direction of a single dipole on the relation between S/W ratio and dipole parameter estimation errors is important. Monte Carlo simulation was used to investigate this influence. The forward problem was calculated using three spherical shell model, and dipole parameters were optimized by means of simplex method. As the number of electrodes became large, as the dipole went from midbrain to cortex, and as the direction of dipole changed from radial to tangential, the average and standard deviation of estimation errors became small.

단일 쌍극자 모델을 이용한 source localization 문제에서 전극의 갯수, 쌍극자의 위치 및 방향 등이 S/N(signal to noise ratio)과 추정 오차사이의 관계에 미치는 영향을 Monte Carlo 시뮬레이션으로 조사했다. forward problem은 3중 구각 모델로 계산했고, simplex 방법으로 쌍극자 파라미터를 최적화시켰다. 전극의 갯수가 많을때, 쌍극자가 뇌 중심(midbrain)보다 대뇌 피질(cortex)부근에 있을 때, 쌍극자가 tangential 방향일 때 추정 오차의 평균과 표준편차가 작아졌다.

Keywords

References

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