Method and system for determining electromotive force or impress

Details Method and system for determining electromotive force or impress Method and system for determining electromotive force or impress

1993-02-04

1995-06-20

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetic field detection devices

1286531, 128731, 128734, 36441302, G01R 3302, A61B 505

Patent

active

054263654

ABSTRACT:
In a magnetic field generation source measuring method and system for determining a magnetic field generation source in an object to be examined from a magnetic field in the interior of the object measured at the exterior of the object, the object is represented by a model in which the object is divided into a plurality of cells. The resistance values of each cell in x, y and z directions are determined from information concerning the electric conductivity of the interior of the object beforehand measured. Supposing the distribution of electromotive forces in the object as a current source, a return current generated in accordance with the electromotive force distribution in the object is determined by use of estimated values of the intensities of the current source in the x, y and z directions and the resistance values. A vector of the sum of a current of the current source and the return current is determined for all of the cells. The second power of the absolute value of a difference between the vector of the sum and a current vector determined from the magnetic field in the interior of the object measured at the exterior of the object is subjected to summation for all of the cells. The estimated values of the current source intensities, which minimize the summation, are determined as an electromotive force distribution in the object.

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