Real-time autoshimming for echo planar timecourse imaging.

  title={Real-time autoshimming for echo planar timecourse imaging.},
  author={Heidi A. Ward and Stephen J. Riederer and Clifford R. Jack},
  journal={Magnetic resonance in medicine},
  volume={48 5},
Head motion within an applied magnetic field alters the effective shim within the brain, causing geometric distortions in echo planar imaging (EPI). Even if subtle, change in shim can lead to artifactual signal changes in timecourse EPI acquisitions, which are typically performed for functional MRI (fMRI) or diffusion tensor imaging. Magnetic field maps acquired before and after head motions of clinically realistic magnitude indicate that motion-induced changes in magnetic field may cause… CONTINUE READING

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