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Method for automatically shimming a high resolution NMR magnet

  • US 5,343,151 A
  • Filed: 03/11/1993
  • Issued: 08/30/1994
  • Est. Priority Date: 03/11/1993
  • Status: Expired due to Term
First Claim
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1. In an NMR spectrometer having coils for generating a main magnetic field having a direction over a sample volume, means for passing field current through the coils, a gradient coil, means for passing a gradient current through the gradient coil to generate a magnetic field gradient along a predetermined direction within the sample volume, a method for correcting the main magnetic field to a spatially uniform field along the predetermined direction over the sample volume by selectively adjusting the magnitude of the field current, the method comprising the steps of:

  • A. inserting a material sample containing NMR-active nuclei into the sample volume;

    B. setting the gradient current to a predetermined value;

    C. performing an NMR experiment to acquire a frequency spectrum data set of the sample while the gradient current remains at the predetermined value set in step B;

    D. adjusting the gradient current to a new value to change the gradient field;

    E. repeating steps C and D a predetermined number of times to acquire multiple frequency spectrum data sets with different times and gradient field magnitudes;

    F. manipulating the frequency spectrum data sets acquired in step E to produce a new data set relating field strength to spatial position; and

    G. using the new data set produced in step F to adjust the magnitude of the field current.

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