Chapter

Head motion and its correction

Mick J. Brammer

in Functional Magnetic Resonance Imaging

Published in print November 2001 | ISBN: 9780192630711
Published online March 2012 | e-ISBN: 9780191724770 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780192630711.003.0013
Head motion and its correction

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The aim of functional magnetic resonance imaging (fMRI) data analysis is, in simple terms, to identify small, spatially localized changes in image intensity that accompany the performance of some experimental task. It gives rise to some of the problems that relate to head motion and signal to noise ratio. The purpose of this chapter is to illustrate some of these problems and to discuss some of the methods that have been developed to counter them. The realization that head motion is a potentially serious confound in fMRI has led to the development of a number of strategies for dealing with this problem. The chapter further reveals that motion correction is a computationally expensive process and discusses the practical implications of motion correction. Finally, it shows that subject motion remains a potentially serious problem in fMRI and describes some of the available methodology and the practical impact of correction on activation mapping.

Keywords: head motion; fMRI; motion correction; subject motion; activation mapping; image intensity

Chapter.  4441 words.  Illustrated.

Subjects: Neuroscience

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