Abstract：
:Functional MRI (fMRI) studies of jaw motion, speech, and swallowing disorders have been hampered by motion artifacts. Tissue motion perturbs the static magnetic field, creating geometric distortions in echo-planar images that lead to many false positives in activation maps. These problems have restricted blood oxygenation level-dependent (BOLD) fMRI studies involving orofacial muscles to event-related designs, which offer weak contrast-to-noise ratios when compared to block designs. Two new approaches are described that greatly reduce false positives in the activation maps created by the distortions in block-design fMRI studies involving jaw and tongue motion during chewing. First, an appropriate task duration of 10-14 s was found to maximize functional contrast while minimizing motion artifacts. Second, three motion-sensitive postprocessing methods were applied successively to examine the temporal and spatial characteristics of responses and identify and remove false positives caused by motion artifacts. These techniques are shown to allow the use of block design in an fMRI study of a jaw motion task. Extension to speech and swallowing tasks is discussed.
journal_name
Neuroimagejournal_title
NeuroImageauthors
Soltysik DA,Hyde JSdoi
10.1016/j.neuroimage.2005.08.063keywords:
subject
Has Abstractpub_date
2006-02-15 00:00:00pages
1260-71issue
4eissn
1053-8119issn
1095-9572pii
S1053-8119(05)00627-0journal_volume
29pub_type
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