Real-time artifact filtering in continuous VEPs/fMRI recording

Muhammad Nabeel Anwar, Laura Bonzano, Davide Rossi Sebastiano, Luca Roccatagliata, Giovanni Gualniera, Paolo Vitali, Carla Ogliastro, Luciano Spadavecchia, Guido Rodriguez, Vittorio Sanguineti, Pietro Morasso, Fabio Bandini

Research output: Contribution to journalArticlepeer-review

Abstract

Continuous recording of Visual Evoked Potentials (VEPs) and functional Magnetic Resonance Imaging (fMRI) exploits the VEPs high temporal resolution and the fMRI high spatial resolution. In this work, we present a new method of continuous VEPs/fMRI recording to study visual function in seven normal subjects. Our real-time artifact filtering is characterized by a procedure based on an analytical study of echo-planar imaging (EPI) sequence parameters related electro-encephalogram (EEG)-artifact shapes. The magnetic field artifacts were minimized by using a dedicated amagnetic device and by a subtraction algorithm that takes into account the EPI sequence parameters. No significant decrease in signal-to-noise ratio was observed in case of EEG recording simultaneously with MR acquisition; similarly, transient and steady-state VEPs parameters were comparable during fMRI acquisition and in the off-phase of fMRI recording. We also applied this method to one patient with optic neuritis, and, compared with controls, found different results. We suggest that our technique can be reliably used to investigate the function of human visual cortex and properly correlate the electrophysiological and functional neuroimaging related changes.

Original languageEnglish
Pages (from-to)213-223
Number of pages11
JournalJournal of Neuroscience Methods
Volume184
Issue number2
DOIs
Publication statusPublished - Nov 15 2009

Keywords

  • Continuous recording
  • Functional Magnetic Resonance Imaging (fMRI)
  • Optic neuritis
  • Real-time filtering
  • Steady-state and transient Visual Evoked Potentials (VEPs)

ASJC Scopus subject areas

  • Neuroscience(all)

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