J Neurol Surg A Cent Eur Neurosurg
Department of Neurosurgery, Elisabeth-TweeSteden Ziekenhuis, Tilburg, The Netherlands.
Published: July 2021
Background And Objectives: It remains to be determined whether noninvasive functional imaging techniques can rival the clinical potential of direct electrocortical stimulation (DES). In this study, we compared the results of resting-state functional magnetic resonance imaging (rs-fMRI) to those of DES for language mapping. Our goals were twofold: (1) to replicate a previous study that demonstrated that resting-state connectivity (RSC) was significantly larger between positive DES language sites than between negative DES language sites and (2) to compare the spatial resolution of rs-fMRI to that of DES.
Methods: We conducted a retrospective study of nine low-grade glioma patients. Language sites were identified by intraoperative DES. We compared RSC values between and within groups of DES-positive and DES-negative regions of interest (ROIs). Both close-negative sites (i.e., DES-negative sites <1 cm apart from and on the same gyrus as DES-positive sites) and far-negative sites (i.e., purely randomly chosen sites not in the vicinity of the tumor or of the DES-positive sites but on the same lobe) were included. Receiver operating characteristics were used to quantify comparisons.
Results: Functional connectivity between all positive language sites was on average significantly higher than between all close-negative sites and between all far-negative sites. The functional connectivity between the positive language ROIs and their respective close-negative control sites was not smaller than between all positive language sites.
Conclusion: rs-fMRI likely reflects similar neural information as detected with DES, but in its current form does not reach the spatial resolution of DES.
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http://dx.doi.org/10.1055/s-0040-1721757 | DOI Listing |
Infant Ment Health J
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Canterbury Child Development Research Group, University of Canterbury, Christchurch, New Zealand.
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Dr. Fernandez: Associate Professor, Department of Family Medicine and Emergency Medicine, Faculty of Medicine Université de Montréal, Centre-ville Montréal, Québec, Canada.
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