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

Durand, E; van de Moortele, P F; Pachot-Clouard, M; Le Bihan, D

Durand, E; van de Moortele, P F; Pachot-Clouard, M; Le Bihan, D.

Afiliación

Durand E; Unité de Recherche en Résonance Magnétique Médicale (U2R2M), CHU-Bicêtre, 78 rue du Général Leclerc, F 94275 Le Kremlin-Bicêtre Cedex, France. emmanuel.durand@cierm.u-psud.fr

Magn Reson Med ; 46(1): 198-201, 2001 Jul.

Article en En | MEDLINE | ID: mdl-11443728

RESUMEN

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.

Asunto(s)

Artefactos; Imagen Eco-Planar/métodos; Imagen por Resonancia Magnética/métodos; Algoritmos; Análisis de Fourier; Humanos; Imagen por Resonancia Magnética/instrumentación; Fantasmas de Imagen; Vías Férreas

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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Imagen por Resonancia Magnética / Artefactos / Imagen Eco-Planar Límite: Humans Idioma: En Revista: Magn Reson Med Asunto de la revista: DIAGNOSTICO POR IMAGEM Año: 2001 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos

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