Physics – Medical Physics
Scientific paper
2004-12-04
Physics
Medical Physics
Scientific paper
10.1088/0266-5611/20/4/005
The problem of determining the neuronal current inside the brain from measurements of the induced magnetic field outside the head is discussed under the assumption that the space occupied by the brain is approximately spherical. By inverting the Geselowitz equation, the part of the current which can be reconstructed from the measurements is precisely determined. This actually consists of only certain moments of one of the two functions specifying the tangential part of the current. The other function specifying the tangential part of the current as well as the radial part of the current are completely arbitrary. However, it is also shown that with the assumption of energy minimization, the current can be reconstructed uniquely. A numerical implementation of this unique reconstruction is also presented.
Fokas Athanassios S.
Kurylev Yaroslav
Marinakis V.
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