Artifact due to B(0) fluctuations in fMRI: correction using the k-space central line. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Magnetic Resonance in Medicine Année : 2001

Artifact due to B(0) fluctuations in fMRI: correction using the k-space central line.

Résumé

Magnetic resonance experiments require the main magnetic field, B(0), to remain very stable. Several external sources, such as moving ferromagnetic objects and/or changing electromagnetic fields, can significantly change the value of B(0) over time. This work describes an apparent displacement along the phase-encoding axis caused by a variation in B(0). This artifact was observed in fMRI images acquired with EPI. The effect was characterized and tested using an immobile phantom. The image displacement motion along the phase-encoding axis closely followed the changes in B(0). The phase of the central line in the Fourier space was successfully used to correct this artifact. Fluctuations in B(0) may result in artifacts that mimic subject head motion, and must be appropriately corrected. Magn Reson Med 46:198-201, 2001.

Domaines

Imagerie
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Dates et versions

hal-00349816 , version 1 (04-01-2009)

Identifiants

  • HAL Id : hal-00349816 , version 1
  • PUBMED : 11443728

Citer

E. Durand, P. F. van de Moortele, M. Pachot-Clouard, D. Le Bihan. Artifact due to B(0) fluctuations in fMRI: correction using the k-space central line.. Magnetic Resonance in Medicine, 2001, 46 (1), pp.198-201. ⟨hal-00349816⟩
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