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Ferromagnetic foreign body detection with background canceling

  • US 20020077537A1
  • Filed: 09/21/2001
  • Published: 06/20/2002
  • Est. Priority Date: 06/25/1996
  • Status: Active Grant
First Claim
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1. A method for noninvasive screening of a human body for the presence of a ferromagnetic foreign body, said method comprising:

  • providing an instrument which includes at least one magnetic sensor, an applied field coil, and means for processing sensed signals from said at least one magnetic sensor;

    positioning said instrument external to a patient in proximity to a region of interest;

    supplying said applied field coil with current, thereby applying a magnetic field to said region of interest;

    sensing a magnetic response from said region of interest with said magnetic sensor;

    rejecting the magnetic response from biological tissues in said region of interest; and

    outputting data corresponding to the magnetic response of a ferromagnetic foreign body within said region of interest.

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