Precise Fusion of Meg and Mri Tomography Using a Surface Fit

Combined Study of Ischemic Brain Conditions using Magnetencephalography and Proton Magnetic Resonance Spectroscopy Imaging

“…The highest density of the dipoles (D Msw ) was divided by the line spacing tp give a normalized value in an each measurement (Dsundard)· Combination of Spontaneous MEG and H MRI During the MEG measurement, the accessible parts of the head surface of a subject were scanned by an electromagnetic digitizer (Isotrak™ 3D-Digitizer, Polhemus Navigation Sciences Inc., USA). In order to superimpose the MEG results on 3D MRI and MRSI data, the scanned head surface data set was fitted to the reconstructed MRI headshape using our surface-fit program [6].…”

Sensory Speech Area Investigated by Magnetoencephalography

“…The time course of left and right measurements were compared to each other and sources were localized using a single dipole fit (Marquardt algorithm), Additionally the Current Localization using the Spatial Filtering (CLSF) was applied, which showi the region of most probable current flow (Grummich et al 1992). The results were inserted into MR-slices using a coordinate transformation obtained by a head contour fit (Kober et al 1993).…”

Image-Guided Removal of Supratentorial Cavernomas in Critical Brain Areas: Application of Neuronavigation and Intraoperative Magnetic Resonance Imaging

“…The MAGNES II biomagnetometer (Biomagnetic technologies Inc, San Diego, USA) with 2 37 multichannels was used for the localization of sensorimotor and language areas MEG as described previously [13]. The MEG source localizations were plotted on spatially aligned MR images via transformation of the MR and MEG coordinate system by a contour fit program, fitting the digitally scanned head shape including the MEG dipole source to the patient's MRI data [14]. Additionally in one case fMRI-data were applied using echo planar imaging with a 1.5 Tesla MR scanner (Magnetom Symphony; Siemens Medical Solutions, Erlangen, Germany) [15].…”