Gradient induced artifacts in simultaneous EEG-fMRI: Effect of synchronization on spiral and EPI k-space trajectories

Solana Sanchez, Ana Beatriz and Hernández Tamames, J.A. and Pozo Guerrero, Francisco Del and Manzanedo Sáenz, Eva and Garcia Álvarez, Roberto and Zelaya, Fernando and Pozo, Francisco del (2014). Gradient induced artifacts in simultaneous EEG-fMRI: Effect of synchronization on spiral and EPI k-space trajectories. "Magnetic Resonance Imaging", v. 32 (n. 6); pp. 684-692. ISSN 0730-725X. https://doi.org/10.1016/j.mri.2014.03.008.

Description

Title: Gradient induced artifacts in simultaneous EEG-fMRI: Effect of synchronization on spiral and EPI k-space trajectories
Author/s:
  • Solana Sanchez, Ana Beatriz
  • Hernández Tamames, J.A.
  • Pozo Guerrero, Francisco Del
  • Manzanedo Sáenz, Eva
  • Garcia Álvarez, Roberto
  • Zelaya, Fernando
  • Pozo, Francisco del
Item Type: Article
Título de Revista/Publicación: Magnetic Resonance Imaging
Date: 2014
ISSN: 0730-725X
Volume: 32
Subjects:
Freetext Keywords: EPI fMRI, Spiral fMRI, Gradient artifact, Simultaneous EEG-fMRI, Synchronization
Faculty: Centro de Tecnología Biomédica (CTB) (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The nature of the gradient induced electroencephalography (EEG) artifact is analyzed and compared for two functional magnetic resonance imaging (fMRI) pulse sequences with different k-space trajectories: echo planar imaging (EPI) and spiral. Furthermore, the performance of the average artifact subtraction algorithm (AAS) to remove the gradient artifact for both sequences is evaluated. The results show that the EEG gradient artifact for spiral sequences is one order of magnitude higher than for EPI sequences due to the chirping spectrum of the spiral sequence and the dB/dt of its crusher gradients. However, in the presence of accurate synchronization, the use of AAS yields the same artifact suppression efficiency for both pulse sequences below 80 Hz. The quality of EEG signal after AAS is demonstrated for phantom and human data. EEG spectrogram and visual evoked potential (VEP) are compared outside the scanner and use both EPI and spiral pulse sequences. MR related artifact residues affect the spectra over 40 Hz (less than 0.2 μV up to 120 Hz) and modify the amplitude of P1, N2 and P300 in the VEP. These modifications in the EEG signal have to be taken into account when interpreting EEG data acquired in simultaneous EEG-fMRI experiments.

Funding Projects

TypeCodeAcronymLeaderTitle
Madrid Regional GovernmentS-SAL-312-2006UnspecifiedUnspecifiedUnspecified
Government of SpainTEC2009-14587-C03-02UnspecifiedUnspecifiedUnspecified
Universidad Politécnica de MadridRR02/2009UnspecifiedUnspecifiedUnspecified

More information

Item ID: 35622
DC Identifier: http://oa.upm.es/35622/
OAI Identifier: oai:oa.upm.es:35622
DOI: 10.1016/j.mri.2014.03.008
Official URL: http://www.sciencedirect.com/science/article/pii/S0730725X14000903
Deposited by: Memoria Investigacion
Deposited on: 24 Apr 2017 18:19
Last Modified: 21 May 2019 11:23
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