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Current patterns for impedance tomography

  • US 5,272,624 A
  • Filed: 10/02/1990
  • Issued: 12/21/1993
  • Est. Priority Date: 10/02/1990
  • Status: Expired due to Term
First Claim
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1. An electrical impedance imaging method using means for forming images of internal impedances at a multiplicity of points within a body and temporal variations of the impedances using an array of electrodes on the surface of the body, a plurality of current generators, each for applying a current to a respective single electrode, means for generating a plurality of current patterns and means for measuring a voltage at each electrode for each current pattern, the improvement comprising:

  • controlling each current generator for generating ac currents, the current of all the generators together forming current patterns with differing spatial frequencies;

    applying and removing the currents of each current pattern to and from all the current generators respectively to and from all the electrodes simultaneously;

    measuring the voltage at each electrode; and

    providing the measured voltage at each electrode to the means for forming images.

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