Real-time artifact filtering in continuous VEPs/fMRI recording

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• 作者：Muhammad Nabeel Anwar ; Laura Bonzano ; Davide Rossi Sebastiano ; Luca Roccatagliata ; Giovanni Gualniera ; Paolo Vitali ; Carla Ogliastro ; Luciano Spadavecchia ; Guido Rodriguez ; Vittorio Sanguineti ; Pietro
• 关键词：Continuous recording ; Real-time filtering ; Functional Magnetic Resonance Imaging (fMRI) ; Steady-state and transient Visual Evoked Potentials (VEPs) ; Optic neuritis
• 刊名：Journal of Neuroscience Methods
• 出版年：2009
• 出版时间：15 November 2009
• 年：2009
• 卷：184
• 期：2
• 页码：213-223
• 全文大小：1993 K

文摘

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.