Correlation of Sensorimotor Activation with Functional Magnetic Resonance Imaging and Magnetoencephalography in Presurgical Functional Imaging: A Spatial Analysis
| Autor: | Rudolf Fahlbusch, Christopher Nimsky, Helmut Kober, Oliver Ganslandt, Peter Hastreiter, Martin Möller |
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| Rok vydání: | 2001 |
| Předmět: |
Adult
Male Adolescent genetic structures Cognitive Neuroscience Sensory system Somatosensory system behavioral disciplines and activities Brain mapping Stereotaxic Techniques Imaging Three-Dimensional medicine Humans Aged Aged 80 and over medicine.diagnostic_test Brain Neoplasms Motor Cortex Magnetoencephalography Somatosensory Cortex Middle Aged Magnetic Resonance Imaging Central sulcus Functional imaging medicine.anatomical_structure Surgery Computer-Assisted nervous system Neurology Female Psychology Functional magnetic resonance imaging Neuroscience psychological phenomena and processes Motor cortex |
| Zdroj: | NeuroImage. 14:1214-1228 |
| ISSN: | 1053-8119 |
| Popis: | In this study we investigated the spatial heterotopy of MEG and fMRI localizations after sensory and motor stimulation tasks. Both methods are frequently used to study the topology of the primary and secondary motor cortex, as well as a tool for presurgical brain mapping. fMRI was performed with a 1.5T MR system, using echo-planar imaging with a motor and a sensory task. Somatosensory and motor evoked fields were recorded with a biomagnetometer. fMRI activation was determined with a cross-correlation analysis. MEG source localization was performed with a single equivalent current dipole model and a current density localization approach. Distances between MEG and fMRI activation sites were measured within the same anatomical 3-D–MR image set. The central region could be identified by MEG and fMRI in 33 of 34 cases. However, MEG and fMRI localization results showed significantly different activation sites for the motor and sensory task with a distance of 10 and 15 mm, respectively. This reflects the different neurophysiological mechanisms: direct neuronal current flow (MEG) and secondary changes in cerebral blood flow and oxygenation level of activated versus non activated brain structures (fMRI). The result of our study has clinical implications when MEG and fMRI localizations are used for pre- and intraoperative brain mapping. Although both modalities are useful for the estimation of the motor cortex, a single modality may err in the exact topographical labeling of the motor cortex. In some unclear cases a combination of both methods should be used in order to avoid neurological deficits. |
| Databáze: | OpenAIRE |
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