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Volume parcellation for improved dynamic shimming.

Michael Poole1, Richard Bowtell

  • 1Sir Peter Mansfield Magnetic Resonance Centre, School of Physics and Astronomy, University Park, Nottingham, NG7 2RD, UK.

Magma (New York, N.Y.)
|January 9, 2008
PubMed
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Parcellated dynamic shimming, a novel method, can improve magnetic field homogeneity in MRI. This technique shows promise for reducing image distortions and signal loss, especially at high magnetic field strengths.

Area of Science:

  • Medical Imaging
  • Physics

Background:

  • Homogeneous magnetic fields are crucial for magnetic resonance imaging (MRI), particularly at high static magnetic field strengths.
  • Susceptibility-induced distortions and signal losses are significant challenges at higher field strengths.
  • Dynamic shim updating improves magnetic field homogeneity more than global shimming during multi-slice MRI acquisition.

Purpose of the Study:

  • To investigate the efficacy of a novel parcellated dynamic shimming method via simulation.
  • To assess the potential of parcellated dynamic shimming for enhancing magnetic field homogeneity in MRI.

Main Methods:

  • Simulations were conducted to evaluate the parcellated dynamic shimming method.
  • The method involves sequential shimming and image data acquisition over compact, cuboidal sub-volumes.

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Main Results:

  • Parcellated dynamic shimming demonstrated improved efficacy in simulations.
  • Linear-term-based parcellated dynamic shimming performed comparably to slice-based dynamic shimming with higher-order terms.

Conclusions:

  • Parcellated dynamic shimming can further reduce effective magnetic field inhomogeneity compared to plane-based methods.
  • Further research is required to develop optimal imaging approaches for implementing parcellated dynamic shimming.