Journal
NEUROIMAGE
Volume 14, Issue 6, Pages 1424-1431Publisher
ACADEMIC PRESS INC
DOI: 10.1006/nimg.2001.0915
Keywords
magnetoencephalography; inverse problem; head movements
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Head movements during neuromagnetic measurements may cause a significant error in the estimated locations of active brain areas. In this study we present a fast method for measuring the head position while neuromagnetic data are acquired. We then compare two methods for removing the effect of the movements in neuromagnetic source estimation and magnetic field alignment: minimum-norm estimate alignment and forward calculation correction. Simulations and a test measurement show that the proposed head position measurement method works with millimeter precision and that incorporating the effect of the head movements into the magnetic field forward calculations is an efficient and a sufficiently accurate method for correcting for the head movements. (C) 2001 Academic Press.
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