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date: 20 January 2020

Abstract and Keywords

This chapter focuses on magnetoencephalography (MEG) used in brain imaging and its use in localizing the brain sources of externally recorded spontaneous activity and stimulus and task –induced activation. The chapter first describes the instruments used for recording the magnetoencephalographic signals and the neurogenesis of these signals. It then considers proposed solutions for the “inverse” problem and describes approaches for MEG source estimation, including a method that specifies only one or many equivalent current dipoles. It also explains the signal source-localizing technique known as beamforming and concluding with a discussion of practical issues in MEG/MSI, with emphasis on those arising in clinical applications of the method.

Keywords: magnetoencephalography, magnetic source imaging, superposition, magnetic fields, forward problem, spherical model, inverse problem, equivalent current dipoles, beamforming, brain imaging

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