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On the magnetic field generated outside an inhomogeneous volume conductor by internal current sources

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      On bioelectric potentials in an inhomogeneous volume conductor.

      Green's theorem is used to derive two sets of expressions for the quasi-static potential distribution in an inhomogeneous volume conductor. The current density in passive regions is assumed to be linearly related instantaneously to the electric field. Two equations are derived relating potentials to an arbitrary distribution of impressed currents. In one, surfaces of discontinuity in electrical conductivity are replaced by double layers and in the other, by surface charges. A multipole equivalent generator is defined and related both to the potential distribution on the outer surface of the volume conductor and to the current sources. An alternative result involves the electric field at the outer surface rather than the potential. Finally, the impressed currents are related to electrical activity at the membranes of active cells. The normal component of membrane current density is assumed to be equal at both membrane surfaces. One expression is obtained involving the potentials at the inner and outer surfaces of the membrane. A second expression involves the transmembrane potential and the normal component of membrane current.
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        DETECTION OF THE MAGNETIC FIELD OF THE HEART.

         R McFee,  G H Baule (1963)
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          Theory of Magnetic Detection of the Heart's Electrical Activity

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            Author and article information

            Journal
            IEEE Transactions on Magnetics
            IEEE Trans. Magn.
            Institute of Electrical and Electronics Engineers (IEEE)
            0018-9464
            June 1970
            June 1970
            : 6
            : 2
            : 346-347
            10.1109/TMAG.1970.1066765
            © 1970
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