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Method and apparatus for determining probe location

  • US 5,882,304 A
  • Filed: 10/27/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 10/27/1997
  • Status: Expired due to Fees
First Claim
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1. A method for determining a position of a surgical instrument, the method comprising the steps of:

  • placing an electron spin resonance sample in a known position with respect to the surgical instrument;

    placing the sample in the imaging region of a magnetic resonance imaging apparatus having a main magnetic field;

    applying at least a first gradient magnetic field in the imaging region;

    determining the resonant frequency of the sample in the presence of the at least a first gradient magnetic field; and

    based on the resonant frequency of the sample, determining the position of the surgical instrument with respect to the at least a first gradient magnetic field.

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