Recording of electrical brain activity in a magnetic resonance environment: Distorting effects of the static magnetic field
作者:
René M. Müri,
Jacques Felblinger,
Kai M. Rösier,
Bruno Jung,
Christian W. Hess,
Chris Boesch,
期刊:
Magnetic Resonance in Medicine
(WILEY Available online 1998)
卷期:
Volume 39,
issue 1
页码: 18-22
ISSN:0740-3194
年代: 1998
DOI:10.1002/mrm.1910390105
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Electroencephalogram;visually evoked potentials;magnetic resonance;patient monitoring
数据来源: WILEY
摘要:
AbstractThe 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 amplitud
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