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Method and system for correcting errors in MR images due to regions of gradient non-uniformity for parametric imaging such as quantitative flow analysis

  • US 6,163,152 A
  • Filed: 06/15/1998
  • Issued: 12/19/2000
  • Est. Priority Date: 06/15/1998
  • Status: Expired due to Term
First Claim
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1. A method of correcting systematic errors occurring due to magnetic gradient non-uniformity in phase contrast MR images for quantitative flow analysis comprising the steps ofgenerating a gradient non-uniformity error map for an MR image scan that includes a representation of magnetic gradient strength non-uniformity as a function of distance;

  • acquiring at least two MR data sets having flow sensitive gradients containing systematic errors due to magnetic gradient non-uniformity;

    calculating a phase difference image to determine a measured velocity image; and

    calculating a corrected velocity image using the measured velocity image and the gradient non-uniformity error map.

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