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Magnetic core flux canceling of ferrites in MRI

  • US 8,311,637 B2
  • Filed: 02/06/2009
  • Issued: 11/13/2012
  • Est. Priority Date: 02/11/2008
  • Status: Active Grant
First Claim
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1. A device for use with a ferrite material core, the device comprising:

  • a magnetic field sensor adapted for placement at the ferrite material core in an implantable medical device, the magnetic field sensor adapted to transmit a signal corresponding to a magnitude of a first static magnetic field at the ferrite material core;

    a coil configured to be disposed around the ferrite material core; and

    a driver circuit configured to receive the signal and to vary a voltage applied across the coil based on the signal, the voltage applied across the coil creating a second magnetic field at least partially in a direction opposite the first static magnetic field.

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