Journal
NEUROIMAGE
Volume 33, Issue 4, Pages 1082-1092Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2006.07.038
Keywords
EEG; MRI; conductive ink; Eddy currents; SAR; motion sensors
Funding
- NCRR NIH HHS [P41 RR14075] Funding Source: Medline
- NIBIB NIH HHS [R01 EB002459] Funding Source: Medline
- NICHD NIH HHS [HD 040712] Funding Source: Medline
- NINDS NIH HHS [R01 NS037462] Funding Source: Medline
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We aimed at improving the signal-to-noise ratio (SNR) of electroencephalography (EEG) during magnetic resonance imaging (MRI) by introducing a new EEG cap (InkCap) based on conductive ink technology. The InkCap was tested with temperature measurements on an electrically conductive phantom head and during structural and functional MRI (fMRI) recordings in 11 healthy human volunteers at 7 T. Combined EEG/fMRI measurements were conducted to study the interaction between the two modalities. The EEG recordings with the InkCap demonstrated up to a five-fold average decrease in signal variance during echo-planar imaging, with respect to a cap made of standard carbon fiber leads. During concurrent EEG/fMRI measurements in human volunteers, alpha oscillations were clearly detected at 7 T. Minimal artifacts were present in the T2* and high-resolution structural MR images of the brain parenchyma. Our results show that the InkCap technology considerably improves the quality of both EEG and (f)MRI during concurrent measurements even at 7 T. (c) 2006 Elsevier Inc. All rights reserved.
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