Artifact due to B0 fluctuations in fMRI: Correction using the k-space central line Export

@article{citeulike:5935765, abstract = {Magnetic resonance experiments require the main magnetic field, B0, to remain very stable. Several external sources, such as moving ferromagnetic objects and/or changing electromagnetic fields, can significantly change the value of B0 over time. This work describes an apparent displacement along the phase-encoding axis caused by a variation in B0. 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 B0. The phase of the central line in the Fourier space was successfully used to correct this artifact. Fluctuations in B0 may result in artifacts that mimic subject head motion, and must be appropriately corrected. Magn Reson Med 46:198-201, 2001. {\copyright} 2001 Wiley-Liss, Inc.}, address = {Unit\'{e} de Recherche en R\'{e}sonance Magn\'{e}tique M\'{e}dicale, Le Kremlin-Bic\^{e}tre, France; Service Hospitalier Fr\'{e}d\'{e}ric Joliot, Direction des Sciences du Vivant, Commissariat \`{a} l'\'{E}nergie Atomique, Orsay, France}, author = {Durand, Emmanuel and van de Moortele, Pierre-Fran\c{c}ois and Pachot-Clouard, Mathilde and Le Bihan, Denis}, citeulike-article-id = {5935765}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/mrm.1177}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/84503647/ABSTRACT}, doi = {10.1002/mrm.1177}, issn = {1522-2594}, journal = {Magnetic Resonance in Medicine}, keywords = {environment, george-batsios, non-idealities, railroad}, number = {1}, pages = {198--201}, posted-at = {2009-10-13 12:21:11}, priority = {5}, title = {Artifact due to B0 fluctuations in fMRI: Correction using the k-space central line}, url = {http://dx.doi.org/10.1002/mrm.1177}, volume = {46}, year = {2001} }

TY - JOUR ID - citeulike:5935765 L3 - citeulike-article-id:5935765 N2 - Magnetic resonance experiments require the main magnetic field, B0, to remain very stable. Several external sources, such as moving ferromagnetic objects and/or changing electromagnetic fields, can significantly change the value of B0 over time. This work describes an apparent displacement along the phase-encoding axis caused by a variation in B0. 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 B0. The phase of the central line in the Fourier space was successfully used to correct this artifact. Fluctuations in B0 may result in artifacts that mimic subject head motion, and must be appropriately corrected. Magn Reson Med 46:198-201, 2001. © 2001 Wiley-Liss, Inc. IS - 1 JF - Magnetic Resonance in Medicine SN - 1522-2594 AD - Unité de Recherche en Résonance Magnétique Médicale, Le Kremlin-Bicêtre, France; Service Hospitalier Frédéric Joliot, Direction des Sciences du Vivant, Commissariat à l'Énergie Atomique, Orsay, France EP - 201 TI - Artifact due to B0 fluctuations in fMRI: Correction using the k-space central line VL - 46 SP - 198 KW - environment KW - george-batsios KW - non-idealities KW - railroad AU - Durand, Emmanuel AU - van de Moortele, Pierre-François AU - Pachot-Clouard, Mathilde AU - Le Bihan, Denis PY - 2001/// UR - http://dx.doi.org/10.1002/mrm.1177 ER -