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Susceptometers for foreign body detection

  • US 6,965,792 B2
  • Filed: 12/18/2001
  • Issued: 11/15/2005
  • Est. Priority Date: 06/25/1996
  • Status: Expired due to Term
First Claim
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1. A method for performing pre-MRI screening for ferromagnetic foreign bodies, comprising:

  • providing a source-sensor unit including at least one applied-field generating element and at least one magnetic sensor;

    canceling the signal due to the applied magnetic field at the location of said at least one magnetic sensor by the relative arrangement of said at least one applied-field generating element and said at least one magnetic sensor in said source-sensor unit;

    generating an applied magnetic field in the eye of a patient, with said source-sensor unit;

    rotating said eye, thereby moving any ferromagnetic foreign body which may be present to modulate the magnetic susceptibility signal from said ferromagnetic foreign body, without substantially changing the magnetic susceptibility response of the patient'"'"'s body tissues; and

    generating a magnetic susceptibility measurement relevant to the presence or absence of a ferromagnetic foreign body in said eye, with said source-sensor unit.

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