Spatial filters based on independent component analysis for magnetic noise reduction in the magnetocardiogram
| Autor: | Suhui Lee, Hee-Joo Lee, Y. Huh, Tae-Seok Park |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Physics
Spatial correlation Magnetic noise Spatial filter Astrophysics::High Energy Astrophysical Phenomena Acoustics Biomedical Engineering Signal Processing Computer-Assisted Mathematics::Geometric Topology Independent component analysis Noise floor Computer Science Applications Reduction (complexity) Magnetics Noise symbols.namesake Gaussian noise Heart Function Tests Electronic engineering symbols Humans Artifacts |
| Zdroj: | Medical & Biological Engineering & Computing. 42:532-534 |
| ISSN: | 1741-0444 0140-0118 |
| DOI: | 10.1007/bf02350995 |
| Popis: | A spatial filter design method to reduce magnetic noise in the magnetocardiogram (MCG) is introduced. Based on the facts that external magnetic noise appearing on multichannel MCG sensors is independent of the cardiac signals and that there is strong spatial correlation among the channels, the independent component analysis (ICA) method was applied to extract the noise components from the measured MCG signals. After extraction of the noise components in a given time period using ICA, a spatial filter was made to reduce the noise components in subsequently acquired MCG signals. In experimental studies of nine healthy volunteers, the spatial filters improved the signal-to-noise ratio of the MCG signals by about 500% on average. This spatial filtering method can be used for measurements of MCG signals in a magnetically noisy environment. |
| Databáze: | OpenAIRE |
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