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Recording of electrical brain activity in a magnetic resonance environment: Distorting effects of the static magnetic field

✍ Scribed by René M. Müri; Jacques Felblinger; Kai M. Rösier; Bruno Jung; Christian W. Hess; Chris Boesch

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
494 KB
Volume
39
Category
Article
ISSN
0740-3194

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✦ Synopsis

The technical limitations of electroencephalography (EEG) and flashed visually-evoked potentials (VEP) recordings in the static magnetic field of the MR system were systematically studied. A main artifact occurring in the magnetic field was found to be correlated with the heart cycle and had amplitudes in the range of EEG and VEP signals. For VEP recordings, a substantial reduction of this effect was achieved by subtraction of the averaged artifact from the averaged composed signal (VEP and artifact) resulting in the VEP signal alone. However, for continuous EEG recordings, there is no such solution, since the observed effect is not sufficiently constant in amplitude, and the standard deviation of the amplitude of the effect is often larger than the EEG amplitude.

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