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Frequency calibration for MRI scanner

  • US 5,309,102 A
  • Filed: 05/07/1993
  • Issued: 05/03/1994
  • Est. Priority Date: 05/07/1993
  • Status: Expired due to Term
First Claim
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1. A method for automatically adjusting the RF frequency of a transceiver in an NMR system, which comprises:

  • performing an NMR measurement in which an NMR signal is produced and acquired;

    transforming the acquired NMR signal to the frequency domain;

    defining a correlation model which depicts expected fat and water peaks;

    correlating the correlation model with the transformed NMR signal to produce a correlation frequency (fcor );

    locating the peaks in the transformed NMR signal;

    selecting one of the located peaks positioned to one side of the correlation frequency (fcor) as the Larmor frequency of water;

    selecting one of the located peaks positioned to the other side of the correlation frequency (fcor) as the Larmor frequency of fat; and

    outputting to the transceiver on the NMR system an RF frequency command (CF) which is based on the determined water or fat Larmor frequency.

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