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Apparatus and method for reconstructing subsurface electrophysiological patterns

  • US 4,416,288 A
  • Filed: 08/14/1980
  • Issued: 11/22/1983
  • Est. Priority Date: 08/14/1980
  • Status: Expired due to Term
First Claim
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1. An apparatus for recovering a pattern of cell generated electrical field potential U occurring at a specific time t and at a selected depth within a living organ from an associated pattern of electrical potential V at said specific time and at the surface of said living organ, said cell generated electrical field potential U having coordinates x'"'"', y'"'"' and being describable as U=U(x'"'"', y'"'"', y'"'"', t), said electrical potential V having coordinates x, y and being describable as V=V(x, y, t), said apparatus comprising:

  • an electrode array for detecting values of V(x, y, t) at a plurality of points on the surface of said living organ, said points being spaced from each other by a distance determined by the expected spatial frequency of said electrical potential V(x, y, t);

    means for digitizing the detected values of V(x, y, t); and

    means for spatially deconvolving the digitized values of V(x, y, t) to recover the desired pattern of electrical field potential U(x'"'"', y'"'"', t) within said living organ, said deconvolving means including computing a transform function fz =fz (x-x'"'"', y-y'"'"'), said transform function having the value determined by an equation which describes the field potential at each of a plurality of subsurface points with respect to the field potential of each of a plurality of other selected sets of subsurface electric field potential generators, such that the potential at any one point is the sum of potentials from such surrounding generator sets, with each potential having a value determined by the laws of conduction in the volume of said organ, and means for computing the product of said surface field potential V(x, y, t) and the inverse of said transform function to generate values of the electric field potential U(x'"'"', y'"'"', t).

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