کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1807579 | 1025267 | 2008 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Exploring the feasibility of simultaneous electroencephalography/functional magnetic resonance imaging at 7 T Exploring the feasibility of simultaneous electroencephalography/functional magnetic resonance imaging at 7 T](/preview/png/1807579.png)
The increased blood oxygenation level-dependent contrast available at high field makes the implementation of combined EEG/fMRI experiments at 7 T highly worthwhile from the point of view of fMRI data quality, but the higher field poses greater technical challenges for achieving good quality EEG data. A study of the feasibility of recording EEG signals from human subjects at 7 T using a commercially available, MR-compatible EEG system has therefore been carried out. This involved systematic measurement of the sources of noise in EEG recordings made in the 7 T scanner and measurement of RF heating effects on a gel phantom in the presence of a 32-electrode EEG cap. Having found no significant safety concerns and identified a set-up (involving switching off the magnet's cryo-cooler pumps and mounting the EEG amplifier on a cantilever) that limited scanner-induced noise, combined EEG/fMRI experiments employing visual stimulation were then successfully carried out on two human subjects. With the use of beamformer-based analysis of the EEG data, driven responses and alpha-band, event-related desynchronisation were identified in both subjects.
Journal: Magnetic Resonance Imaging - Volume 26, Issue 7, September 2008, Pages 968–977