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SQUID tomographic neuromagnetic imaging
Author(s) -
Singh Manbir,
Brechner R. Ricardo
Publication year - 1989
Publication title -
international journal of imaging systems and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.359
H-Index - 47
eISSN - 1098-1098
pISSN - 0899-9457
DOI - 10.1002/ima.1850010211
Subject(s) - squid , magnetoencephalography , tomographic reconstruction , physics , biomagnetism , magnetic field , planar , current source , optics , tomography , nuclear magnetic resonance , computer science , acoustics , neuroscience , current (fluid) , electroencephalography , ecology , computer graphics (images) , quantum mechanics , biology , thermodynamics
Abstract The human brain emits a measurable magnetic field in response to stimulation. The aim of neuromagnetic imaging is to produce maps of the underlying neuronal activity from measurements of the emitted magnetic field. Modeling neuronal activity by dipolar current sources, we have previously reported simulation studies to reconstruct planar source distributions using the algebraic reconstruction technique, with the constraint that the sources could only have two orientations. We now present a general solution for two‐dimensionally distributed sources, which is based on measuring both the normal and tangential components of the magnetic field. Also, using a single‐channel SQUID neuromagnetometer, we present results of a tomographic imaging experiment conducted with wires carrying currents to demonstrate the potential of neuromagnetic imaging in reconstructing extended cortical sources.