An evaluation of the use of passive shimming to improve frontal sensitivity in fMRI.

@article{Cusack2005AnEO,
  title={An evaluation of the use of passive shimming to improve frontal sensitivity in fMRI.},
  author={Rhodri Cusack and Benedict Russell and Sylvia M. L. Cox and Claudia De Panfilis and Christian Schwarzbauer and Richard E. Ansorge},
  journal={NeuroImage},
  year={2005},
  volume={24 1},
  pages={82-91}
}
The presence of the head in an MRI scanner leads to inhomogeneities in the magnetic field. These cause the 'susceptibility artifacts' of image distortion and signal dropout. In this paper, we evaluate a technique called passive shimming, which has the potential to reduce field inhomogeneities and the resultant artifacts. A piece of a magnetically active material (pyrolytic graphite) is held on the roof of the participant's mouth by a plastic mouth mould. We evaluate the effects in several… CONTINUE READING

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