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Abstract #1467

Safety and EEG Data Quality of Concurrent High-Density EEG and High-Speed fMRI at 3 Tesla

Mette Thrane Foged1,2, Ulrich Lindberg3, Kishore Vakamudi4,5, Henrik BW Larsson2,3, Lars Pinborg1,2, Troels W Kjær2,6, Martin Fabricius6, Claus Svarer1, Brice Ozenne7, Carsten Thomsen2,8, Sándor Beniczky6,9,10, Olaf Bjarne Paulson1,2, and Stefan Posse4,5,11

1Neurobiology Research Unit, Department of Neurology, Rigshospitalet, Copenhagen, Denmark, 2Dept. of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark, 3Functional Imaging Unit, Dept. of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, Copenhagen, Denmark, 4Department of Neurology, University of New Mexico, Albuquerque, NM, United States, 5Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, United States, 6Dept. of Clinical Neurophysiology, Rigshospitalet, Copenhagen, Denmark, 7Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark, 8Dept. of Radiology, Rigshospitalet, Copenhagen, Denmark, 9Danish Epilepsy Centre, Dianalund, Denmark, 10Aarhus University, Aarhus, Denmark, 11Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, United States

Using concurrent high-density EEG and different high-speed fMRI methods, we investigate safety of RF heating, effect on image SNR and assess EEG data quality. RF related electrode heating during a 30-minute scan did not exceed 1.0o C with any of the pulse sequences. No significant differences in the EEG data quality were found between high-speed fMRI and conventional EPI (p=0.78). Residual ballistocardiographic artifacts resulted in 58% of EEG data being rated as poor quality. This study demonstrates that high-density EEG can be safely implemented in conjunction with high-speed fMRI and that high-speed fMRI does not adversely affect EEG data quality.

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