Fourier Imaging of Electrical Currents in the Human Brain from Their Magnetic Fields

1987 ◽  
Vol BME-34 (11) ◽  
pp. 837-842 ◽  
Author(s):  
Walter Kullmann ◽  
William J. Dallas
Keyword(s):  
Magnetic Fields ◽  
Human Brain ◽  
Electrical Currents ◽  
Fourier Imaging

Introduction

2017 ◽  
pp. 3-12
Author(s):  
Riitta Hari ◽  
Aina Puce
Keyword(s):  
Magnetic Fields ◽  
Human Brain ◽  
Brain Dynamics ◽  
Electric Currents ◽  
Electrical Currents ◽  
Activation Patterns ◽  
Neuronal Communication ◽  
Electrical Potentials ◽  
Electric And Magnetic Fields ◽  
The Brain

Neuronal communication in the brain is associated with minute electrical currents that give rise to both electrical potentials on the scalp (measurable by means of electroencephalography [EEG]) and magnetic fields outside the head (measurable by magnetoencephalography [MEG]). Both MEG and EEG are noninvasive neurophysiological methods used to study brain dynamics, that is temporal changes in the activation patterns, and sequences in signal progression. Differences between MEG and EEG mainly reflect differences in the spread of electric and magnetic fields generated by the same electric currents in the human brain. This chapter provides an overall description of the main principles of MEG and EEG and provides background for the following chapters in this and subsequent sections.

Analysis of human brain exposure to low-frequency magnetic fields: A numerical assessment of spatially averaged electric fields and exposure limits

2013 ◽  
Vol 34 (5) ◽  
pp. 375-384 ◽  
Author(s):  
Xi-Lin Chen ◽  
Stefan Benkler ◽  
Nicholas Chavannes ◽  
Valerio De Santis ◽  
Jurriaan Bakker ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Human Brain ◽  
Electric Fields ◽  
Low Frequency ◽  
Exposure Limits ◽  
Numerical Assessment ◽  
Brain Exposure

Bioelectromagnetism

2013 ◽  
pp. 152-197 ◽  
Author(s):  
Andrew W. Wood
Keyword(s):  
Magnetic Fields ◽  
Electric Power ◽  
Living Systems ◽  
Electrical Currents ◽  
Health Implications ◽  
Low Level ◽  
Telecommunication Systems ◽  
Therapeutic Uses ◽  
Transmission And Distribution

Bioelectromagnetism covers a number of sub-disciplines, but is firstly concerned with the ability of living systems to generate electrical currents and magnetic fields. Secondly, it covers the susceptibility of tissue to be stimulated by these currents or fields, and the ability of some organisms to sense low level fields. Thirdly, it also covers the possible health implications of exposure to low level environmental fields, including those associated with the transmission and distribution of electric power and of telecommunication systems. Fourthly, it presents the various therapeutic uses of these fields. Some of the effects are well-established, whereas others remain controversial. This chapter discusses the nature of this uncertainty.

Imaging the Human Brain with Magnetoencephalography

2011 ◽  
pp. 881-889
Author(s):  
Dimitrios Pantazis
Keyword(s):  
Mathematical Modeling ◽  
Medical Imaging ◽  
Magnetic Fields ◽  
Human Brain ◽  
Electrical Activity ◽  
Liquid Helium ◽  
Communication Networks ◽  
Brain Function ◽  
Imaging Modality ◽  
Neuronal Disorders

Magnetoencephalography is a relatively new medical imaging modality for the monitoring and imaging of human brain function. Extracranial magnetic fields produced by the working human brain are measured by extremely sensitive superconducting sensors, called SQUIDs, enclosed in a liquid helium-filled dewar. Mathematical modeling allows the formation of images or maps of cortical neuronal currents that reveal neural electrical activity, identify cortical communication networks, and facilitate the treatment of neuronal disorders, such as epilepsy.

Imaging the Human Brain with Magnetoencephalography

2011 ◽  
pp. 294-302
Author(s):  
Dimitrios Pantazis ◽  
Richard M. Leahy
Keyword(s):  
Mathematical Modeling ◽  
Medical Imaging ◽  
Magnetic Fields ◽  
Human Brain ◽  
Electrical Activity ◽  
Liquid Helium ◽  
Communication Networks ◽  
Brain Function ◽  
Imaging Modality ◽  
Neuronal Disorders

Magnetoencephalography is a relatively new medical imaging modality for the monitoring and imaging of human brain function. Extracranial magnetic fields produced by the working human brain are measured by extremely sensitive superconducting sensors, called SQUIDs, enclosed in a liquid helium-filled dewar. Mathematical modeling allows the formation of images or  maps of cortical neuronal currents that reveal neural electrical activity, identify cortical communication networks, and facilitate the treatment of neuronal disorders, such as epilepsy.

scholarly journals SNR versus resolution in 3D1H MRS of the human brain at high magnetic fields

2001 ◽  
Vol 46 (6) ◽  
pp. 1049-1053 ◽  
Author(s):  
Belinda S.Y. Li ◽  
Juleiga Regal ◽  
Oded Gonen
Keyword(s):  
Magnetic Fields ◽  
Human Brain ◽  
High Magnetic Fields
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