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PT  - JOURNAL ARTICLE
AU  - Yahyavi-Firouz-Abadi, N.
AU  - Pillai, J.J.
AU  - Lindquist, M.A.
AU  - Calhoun, V.D.
AU  - Agarwal, S.
AU  - Airan, R.D.
AU  - Caffo, B.
AU  - Gujar, B.
AU  - Sair, H.I.
TI  - Presurgical Brain Mapping of the Ventral Somatomotor Network in Patients with Brain Tumors Using Resting-State fMRI
AID  - 10.3174/ajnr.A5132
DP  - 2017 Mar 30
TA  - American Journal of Neuroradiology
4099  - http://www.ajnr.org/content/early/2017/03/30/ajnr.A5132.short
4100  - http://www.ajnr.org/content/early/2017/03/30/ajnr.A5132.full
AB  - BACKGROUND AND PURPOSE: Resting-state fMRI readily identifies the dorsal but less consistently the ventral somatomotor network. Our aim was to assess the relative utility of resting-state fMRI in the identification of the ventral somatomotor network via comparison with task-based fMRI in patients with brain tumor.MATERIALS AND METHODS: We identified 26 surgically na|fkve patients referred for presurgical fMRI brain mapping who had undergone both satisfactory ventral motor activation tasks and resting-state fMRI. Following standard preprocessing for task-based fMRI and resting-state fMRI, general linear model analysis of the ventral motor tasks and independent component analysis of resting-state fMRI were performed with the number of components set to 20, 30, 40, and 50. Visual overlap of task-based fMRI and resting-state fMRI at different component levels was assessed and categorized as full match, partial match, or no match. Rest-versus-task-fMRI concordance was calculated with Dice coefficients across varying fMRI thresholds before and after noise removal. Multithresholded Dice coefficient volume under the surface was calculated.RESULTS: The ventral somatomotor network was identified in 81% of patients. At the subject level, better matches between resting-state fMRI and task-based fMRI were seen with an increasing order of components (53% of cases for 20 components versus 73% for 50 components). Noise-removed group-mean volume under the surface improved as component numbers increased from 20 to 50, though ANOVA demonstrated no statistically significant difference among the 4 groups.CONCLUSIONS: In most patients, the ventral somatomotor network can be identified with an increase in the probability of a better match at a higher component number. There is variable concordance of the ventral somatomotor network at the single-subject level between resting-state and task-based fMRI.AbbreviationsBOLDblood oxygen level–dependentICAindependent component analysisrs-fMRIresting-state fMRItb-fMRItask-based fMRIVSMNventral somatomotor networkVUSvolume under the surface