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Investigation of a body

  • US 5,746,214 A
  • Filed: 05/30/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 10/30/1992
  • Status: Expired due to Fees
First Claim
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1. A method of electrical impedance investigation of a body exhibiting a change in internal state, said method comprising:

  • applying to the body interrogatory electrical signals at different frequencies;

    obtaining first signals representing first electrical impedance measurements at the different frequencies before said change in the internal state of the body;

    obtaining second signals representing second electrical impedance measurements at the different frequencies after said change in the internal state of the body, wherein the first and second obtained signals are associated with a variation in two variables, said variables being (i) frequency and (ii) internal state of the body;

    determining a change in said impedance measurements over a variation of one of said two variables;

    determining a normalized change measurement from said change in said impedance measurements, said change in said impedance measurements being normalized with respect to a chosen reference impedance measurement;

    determining a response, over a variation of said other of said variables, to said normalized change measurement; and

    selectively determining characteristics of a part of said body from said response.

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