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Utilization of an intra‐oral diamagnetic passive shim in functional MRI of the inferior frontal cortex
Author(s) -
Wilson James L.,
Jezzard Peter
Publication year - 2003
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10626
Subject(s) - shim (computing) , diamagnetism , homogeneity (statistics) , functional magnetic resonance imaging , magnetic resonance imaging , nuclear magnetic resonance , computer science , magnetic field , physics , neuroscience , medicine , psychology , radiology , surgery , machine learning , quantum mechanics , erectile dysfunction
Due to the presence of gross magnetic susceptibility artifacts, functional MRI (fMRI) has proved problematic in studies of the human inferior frontal cortex (IFC). There is a strong desire, therefore, to employ techniques that mitigate susceptibility artifacts in the IFC while preserving the imaging parameters of an fMRI study. It has been shown that the use of a single, strongly diamagnetic, intra‐oral passive shim significantly improves the homogeneity of the static magnetic field ( B 0 ) and, as a result, alleviates the susceptibility artifacts within the IFC. In this study, practical issues regarding the use of an intra‐oral passive shim are examined. We investigated B 0 instabilities within the IFC resulting from subject head motion in order to calculate the effects of an intra‐oral passive shim on the temporal variance of an EPI time series. These studies show that the addition of an intra‐oral passive shim improves both B 0 homogeneity and signal stability, and increases sensitivity to functional activation. Magn Reson Med 50:1089–1094, 2003. © 2003 Wiley‐Liss, Inc.