Title :
Displaying Raw MEG Measurements with FreeSurfer
Author :
Rugheimer, Sarah M. ; Liu, Qiang ; Sclabassi, Robert J. ; Sun, Mingui
Author_Institution :
Department of Physics and Astronomy, University of Calgary, Calgary, AB, T2N 1N4; Laboratory for Computational Neuroscience, University of Pittsburgh, Pittsburgh, PA 15261
Abstract :
Magnetoencephalography (MEG) is a non-invasive technique of functional imaging which measures weak magnetic fields in the brain due to the currents generated from neural synapses. MEG systems contain a couple of hundred channels, making it difficult to visualize the raw measurements directly. As an alternative to rendering epileptic data, we demonstrate how MEG measurements can be mapped to a cortical surface by using a software package called FreeSurfer. We fuse MEG data with Magnetic Resonance Image (MRI) by plotting the MEG amplitude on top of the MRI images of gray matter surface. In addition to the surface, we render the MEG intensity in the convoluted regions, e.g. sulci, by computationally "inflating" the brain. These techniques are utilized for experimental study currently, and can be extended for diagnostic purposes in the future.
Keywords :
Current measurement; Data visualization; Epilepsy; Fuses; Magnetic field measurement; Magnetic resonance imaging; Magnetoencephalography; Rendering (computer graphics); Software measurement; Software packages;
Conference_Titel :
Bioengineering Conference, 2006. Proceedings of the IEEE 32nd Annual Northeast
Print_ISBN :
0-7803-9563-8
DOI :
10.1109/NEBC.2006.1629751
