Physical and physiological consequences of passive intra-oral shimming
Imaging the human orbitofrontal cortex (OFC) with fMRI is problematic due to the proximity of this region to the air-filled sinuses, which causes susceptibility artifacts. Placing a strongly diamagnetic material into the mouth (‘mouthshim’) of a human volunteer can significantly reduce the artifacts...
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| Veröffentlicht in: | NeuroImage (Orlando, Fla.) Fla.), 2006, Vol.29 (1), p.245-253 |
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| creator | Österbauer, Robert A. Wilson, James L. Calvert, Gemma A. Jezzard, Peter |
| description | Imaging the human orbitofrontal cortex (OFC) with fMRI is problematic due to the proximity of this region to the air-filled sinuses, which causes susceptibility artifacts. Placing a strongly diamagnetic material into the mouth (‘mouthshim’) of a human volunteer can significantly reduce the artifacts in this region. Using the same combined olfactory and visual fMRI paradigm, we compared brain activation and static B
0 field maps of participants being scanned both with and without the ‘mouthshim’. Results demonstrate that the device improves the B
0 field homogeneity within OFC, resulting in significantly stronger BOLD activation in this region. However, the device also caused both increased head motion and reduced activation in insular cortices due to more frequent swallowing and tactile stimulation of the tongue. The ‘mouthshim’ should only, therefore, be used where sensitivity in OFC regions is paramount. |
| doi_str_mv | 10.1016/j.neuroimage.2005.07.006 |
| format | Article |
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0 field maps of participants being scanned both with and without the ‘mouthshim’. Results demonstrate that the device improves the B
0 field homogeneity within OFC, resulting in significantly stronger BOLD activation in this region. However, the device also caused both increased head motion and reduced activation in insular cortices due to more frequent swallowing and tactile stimulation of the tongue. 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0 field maps of participants being scanned both with and without the ‘mouthshim’. Results demonstrate that the device improves the B
0 field homogeneity within OFC, resulting in significantly stronger BOLD activation in this region. However, the device also caused both increased head motion and reduced activation in insular cortices due to more frequent swallowing and tactile stimulation of the tongue. The ‘mouthshim’ should only, therefore, be used where sensitivity in OFC regions is paramount.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>16099680</pmid><doi>10.1016/j.neuroimage.2005.07.006</doi><tpages>9</tpages></addata></record> |
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| subjects | Adult Algorithms Brain Brain Mapping Brain research Data Interpretation, Statistical Deglutition Female fMRI Functional Laterality - physiology Head Movements - physiology Humans Image Processing, Computer-Assisted Insula Magnetic Resonance Imaging - methods Male Methods NMR Nuclear magnetic resonance Olfaction Orbito-frontal cortex Oxygen - blood Physical Stimulation Prefrontal Cortex - anatomy & histology Smell - physiology Studies Susceptibility artifact Tongue - physiology |
| title | Physical and physiological consequences of passive intra-oral shimming |
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