The MEG data were acquired at the Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, with a 306-channel Neuromag Vectorview whole-head system (Elekta Neuromag, Finland) inside a magnetically shielded room. The HPI locations and the participant’s head shape were digitized using a Fastrak digitizer (Polhemus Inc., Colchester, VT) integrated with the VectorView system, and later used for MEG and MRI corregistration. The vertical and horizontal electrooculogram (EOG) and electrocardiogram (ECG) signals were also acquired. The data were bandpass filtered between 0.5 and 200 Hz prior to sampling at 600 Hz. Additionally, five min of empty room data were collected immediately before or immediately after each experimental session, for noise estimation purposes. Structural T1-weighted MPRAGE images were acquired on a 3T scanner (Siemens Medical Systems, Erlangen, Germany) using a 32-channel phase array head coil. Segmentation of the cortical surface was estimated using FreeSurfer (Dale et al., 1999 (link), Fischl et al., 1999 (link)), subjects cortical surfaces were morphed into a common space with ~ 10.000 vertices per hemisphere.
Neuromag vectorview whole head system
Manufactured by Elekta
Sourced in Finland
The Neuromag Vectorview whole-head system is a magnetoencephalography (MEG) device designed for neurological research and clinical applications. It measures the magnetic fields generated by the brain's electrical activity, providing high-resolution data on neural function and brain processes.
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Lab products found in correlation
2 protocols using neuromag vectorview whole head system
1
Multimodal Brain Imaging Protocol
2
Magnetoencephalography Protocol for Brain Activity
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The magnetoencephalogram was recorded using a 306-channel (204 Planar gradiometers, 102 magnetometers) Neuromag Vectorview whole-head system (Elekta Neuromag Oy) housed in a three-layer magnetically shielded room (ImedcoAG). Participant head position was monitored using four head-position indicator (HPI) electrodes affixed to the participant’s head. HPI position as well as that of multiple points on the scalp were recorded with a magnetic digitizer (Polhemus FastTrack 3D) in a head coordinate frame defined by anatomical landmarks. Eye blinks were monitored with 4 electrooculogram (EOG) sensors positioned above and beside the participants’ eyes. MEG, EOG, and HPI data were sampled at 600 Hz, bandpass filtered from 0.1–200 Hz, and stored for offline analysis. MEG data were analyzed using the MNE analysis package31 and custom scripts.
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