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Techniques and Applications of the Elimination of the Cardiac Contribution in MEG Measurements

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Computational Methods in Biophysics, Biomaterials, Biotechnology and Medical Systems

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5.1 5.1 Introduction

Magnetoencephalography (MEG) [18] deals with the detection and interpretation of the minute magnetic fields (50–500 fTesla) generated by electrical activity in the brain. An array of SQUID detectors (Super-conducting QUantum Interference Devices) [27] is placed near the cortical generators and records the brain activity for a short period of time, usually for 1 or 2 s. These recordings are called epochs. The sources of the MEG signal are the same as the ones generating the electrical surface potential on the scalp recorded by the more familiar electroencephalogram (EEG). The MEG and EEG signals are generated directly by the electrical activity in the brain. Typical MEG and/or EEG signals show features lasting from tenths of a millisecond to a few milliseconds. This implies that it is unlikely that the major contributor to the signal is the action potential propagation in the axons of neurons. It is generally agreed that the generators are ionic flows in the...

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  1. Cornelius T. Leondes
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Leondes, C.T. (2003). Techniques and Applications of the Elimination of the Cardiac Contribution in MEG Measurements. In: Leondes, C.T. (eds) Computational Methods in Biophysics, Biomaterials, Biotechnology and Medical Systems. Springer, Boston, MA. https://doi.org/10.1007/0-306-48329-7_5

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  • DOI: https://doi.org/10.1007/0-306-48329-7_5

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4020-7110-2

  • Online ISBN: 978-0-306-48329-5

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