簡易磁気シールド環境下の生体磁気計測におけるオフライン処理による商用電源ノイズ低減の検討

概要

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In biomagnetic measurement in a magnetically moderately shielded room, the dominant environmental field noise is the line-frequency (50 Hz) noise. We have studied off-line processing to reduce the line-frequency noise that is included in the raw data measured with a multichannel SQUID magnetometer. Our method utilizes digital filtering and averaging to obtain exclusively the magnetic field unit vectors, which represent the spatial distribution of the noise field. The results for the magnetic field waveform, after subtraction of line-frequency noise componets, indicated the effectiveness of our method in reducing the noise. Further, localization of a single equivalent current dipole in a simulation showed that the noise-reduced data decreased the error of the dipole location and increased the goodness-of-fit values.
社団法人日本磁気学会の論文
2000-03-01