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Method of localizing an object in an MR apparatus, a catheter and an MR apparatus for carrying out the method

  • US 20030088181A1
  • Filed: 10/18/2002
  • Published: 05/08/2003
  • Est. Priority Date: 10/19/2001
  • Status: Abandoned Application
First Claim
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1. A method of localizing a medical instrument in a body in an examination zone of a magnetic resonance apparatus, the method comprising the steps of:

  • evaluating the interaction between an electromagnetic resonant circuit disposed on the medical instrument and an RF field which is applied for nuclear magnetization in the body in the examination zone; and

    tuning the resonant circuit to the frequency of the RF field, the resonant circuit being capable of assuming two states with a different resonant circuit quality factor;

    inducing a first state of nuclear magnetization with a flip angle by means of a first RF pulse while the resonant circuit is in one of the two states; and

    rephasing the nuclear magnetization by means of a second RF pulse while the resonant circuit is in the other one of the two states.

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