Novel noise reduction methods

Samu Taulu*, Juha Simola, Jukka Nenonen, Lauri Parkkonen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

Abstract

Magnetoencephalography (MEG) is a noninvasive neuroimaging tool that offers a combination of excellent temporal and good spatial resolution, provided that the acquired signals have a high-enough signal-to-noise ratio. This requirement is often compromised as MEG signals are very weak and often masked by interfering signals from environmental noise sources present at most MEG sites. Even more challenging interference is encountered if the subject carries any magnetic material attached to the body, which is sometimes inevitable in clinical settings, e.g., due to therapeutic stimulators. Therefore, to enable reliable data analysis, it is very important to reduce the contribution of noise in MEG signals as efficiently as possible. In this chapter, we review the basic characteristics of MEG signals, give a short review on traditional approaches to suppress noise, and describe some examples of modern noise reduction methods. Specifically, we emphasize the usefulness of advanced mathematical algorithms applied on the multichannel MEG data.

Original languageEnglish
Title of host publicationMagnetoencephalography
Subtitle of host publicationFrom Signals to Dynamic Cortical Networks
Pages73-109
Number of pages37
Edition2nd
ISBN (Electronic)9783030000875
DOIs
Publication statusPublished - 17 Oct 2019
MoE publication typeA3 Part of a book or another research book

Keywords

  • Active compensation
  • Artifact
  • Calibration accuracy
  • Cross talk
  • Independent component analysis
  • Interference
  • Magnetic shielding
  • Multichannel measurement
  • Noise suppression
  • Principal component analysis
  • Signal processing
  • Signal space
  • Signal space projection
  • Signal space separation
  • Spatial filtering

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  • Cite this

    Taulu, S., Simola, J., Nenonen, J., & Parkkonen, L. (2019). Novel noise reduction methods. In Magnetoencephalography: From Signals to Dynamic Cortical Networks (2nd ed., pp. 73-109) https://doi.org/10.1007/978-3-030-00087-5_2