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Robust automated shimming technique using arbitrary mapping acquisition parameters (RASTAMAP).

L Martyn Klassen1, Ravi S Menon

  • 1Laboratory for Functional Magnetic Resonance Research, Robarts Research Institute, London, Ontario, Canada.

Magnetic Resonance in Medicine
|May 4, 2004
PubMed
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A new automated shimming technique, RASTAMAP, precisely measures magnetic fields for MRI. This method optimizes magnetic field homogeneity, crucial for advanced imaging techniques like BOLD and spectroscopy.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics

Background:

  • Quantitative MRI techniques (e.g., BOLD, in vivo spectroscopy) demand high magnetic field homogeneity.
  • Automated shimming requires precise measurement of the main magnetic field (B(0)) and adjustment of shim coil currents.

Purpose of the Study:

  • To develop a robust automated shimming technique for optimizing magnetic field homogeneity in MRI.
  • To enable precise B(0) field mapping independent of arbitrary acquisition parameters.

Main Methods:

  • A novel RASTAMAP (robust automated shimming technique using arbitrary mapping acquisition parameters) method was developed.
  • Utilized a 3D multiecho gradient echo sequence for high-precision B(0) measurement.
  • Incorporated inherent compensation and postprocessing to remove hardware-induced artifacts.

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Main Results:

  • RASTAMAP generated accurate field maps across various fields of view, bandwidths, resolutions, and orientations.
  • Demonstrated minimal field variation (+/- 1 Hz) in phantom studies with altered acquisition parameters.
  • Successfully calculated optimal shim currents for enhanced field homogeneity.

Conclusions:

  • RASTAMAP offers a versatile and precise automated shimming solution for quantitative MRI.
  • The technique overcomes limitations of previous methods by eliminating the need for custom sequence tuning.
  • Enables improved performance for advanced MRI applications requiring optimal magnetic field homogeneity.