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ACTIVE ADAPTIVE DETUNING SYSTEMS AND METHODS FOR INTERVENTIONAL DEVICES

  • US 20130172729A1
  • Filed: 07/01/2011
  • Published: 07/04/2013
  • Est. Priority Date: 07/02/2010
  • Status: Active Grant
First Claim
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1. A system for use during a magnetic resonance imaging procedure, the system comprising:

  • a magnetic resonance imaging device to selectively;

    apply a radio frequency radiation signal across a selected portion of a subject; and

    discontinue application of the radio frequency radiation signal across the selected portion of the subject;

    an interventional device for insertion into the subject and proximate to the selected portion of the subject, the interventional device comprising;

    a radio frequency antenna at a distal end of the interventional device to receive an induced current based on another radio frequency signal emitted from tissue surrounding the radio frequency antenna when the interventional device is inserted in the subject; and

    an inner conductor along a length of the interventional device and connected to the radio frequency antenna to conduct the induced current;

    an adaptive detuning circuit connected to the inner conductor to;

    iteratively adjust an impedance value of the interventional device through each of a plurality of impedance values;

    determine a corresponding magnitude of the induced current in the inner conductor for each of the plurality of impedance values; and

    set the impedance value of the interventional device to a first one of the plurality of impedance values where the corresponding magnitude of the induced current is below a threshold current level.

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