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Method and apparatus for automated magnetic field shimming in magnetic resonance spectroscopic imaging

  • US 4,899,109 A
  • Filed: 08/17/1988
  • Issued: 02/06/1990
  • Est. Priority Date: 08/17/1988
  • Status: Expired due to Fees
First Claim
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1. A method for adjusting currents in plural magnetic shim coils in an MRI/MRSI system comprising the steps of:

  • (a) mapping an existing magnetic field distribution;

    (b) machine calculating an adjusted set of currents for actual shim coils to improve uniformity of field distribution while also using in such calculation an assumed uniformly distributed fictitious pseudo shim coil which does not actually exist thereby permitting uniform offset adjustments to be included in the calculations; and

    (c) applying said adjusted set of currents to the actual shim coils.

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