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Power spectral strain estimators in elastography

  • US 6,494,834 B2
  • Filed: 03/16/2001
  • Issued: 12/17/2002
  • Est. Priority Date: 03/17/2000
  • Status: Expired due to Term
First Claim
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1. A method for measuring strain in a target body comprising:

  • a. acoustically coupling a transducer to the outer surface of a target body such that the path of a beam emitted from the transducer defines a transducer axis;

    b. emitting first a pulse of ultrasound energy into the target body along the transducer axis;

    c. receiving a first reflected signal with the transducer;

    d. storing the first reflected signal;

    e. allowing the target to change dimensions along the axis defined by the transducer;

    f. emitting a second pulse of ultrasound energy into the target body along the transducer axis;

    g. receiving a second reflected signal with the transducer;

    h. storing the second reflected signal;

    i. selecting a portion of the first and second reflected signals;

    j. computing the frequency spectrum of each of the selected portions of the first and second selected signals;

    k. computing the shift between the computed spectra; and

    l. normalizing the computed shift to one of the computed spectra.

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