MEG data (102 magnetometer channels and 204 planar gradiometer channels; sampling rate: 1,000 Hz; band-pass filter: 0.1–330 Hz) were recorded using Elekta Neuromag® TRIUX™ system (Elekta AB, Stockholm, Sweden) in a magnetically shielded room. The head position with respect to the MEG sensors in the helmet was monitored continuously with five digitized head position indicator (HPI) coils attached to the scalp. Three HPI coils were placed on the forehead and one behind each ear. At the beginning of each MEG recording, the positions of HPI coils were determined by three anatomic landmarks (nasion, left and right preauricular points), which were digitized using the Polhemus Isotrak digital tracker system (Polhemus, Colchester, VT, USA). To allow the co-registration with the MRI template, an additional set of points (>100) randomly distributed over the scalp were also digitized. Electro-oculogram (EOG) signal was recorded with one ground electrode attached to the collarbone and another two diagonally placed electrodes (one slightly above the right eye and one slightly below the left eye).
Isotrak digital tracker system
Manufactured by Polhemus
Sourced in United States
The Isotrak digital tracker system is a laboratory equipment product designed for position and orientation tracking. It utilizes electromagnetic technology to provide real-time data on the position and orientation of objects within a defined tracking volume. The core function of the Isotrak system is to accurately measure and record the 6 degrees of freedom (position and orientation) of one or more sensor units.
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Lab products found in correlation
2 protocols using isotrak digital tracker system
1
Magnetoencephalography (MEG) Protocol for Brain Imaging
2
High-Density MEG Recording in Magnetically Shielded Room
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306-channel (102 magnetometers and 102 planar gradiometer pairs) MEG data were recorded in a magnetically shielded room using the Elekta Neuromag® TRIUX™ system (Elekta AB, Stockholm, Sweden) at the Centre for Interdisciplinary Brain Research, at the University of Jyväskylä, Finland.
The head position in relation to the sensors in the helmet was monitored continuously with five digitised head position indicator (HPI) coils attached to the scalp. Three HPI coils were placed on the forehead and one behind each ear. The position of the HPI coils was determined by three anatomic landmarks (nasion, left and right preauricular points) using the Polhemus Isotrak digital tracker system (Polhemus, Colchester, VT) at the beginning of the recording. An additional set of points (>100) randomly distributed over the scalp was also digitised. Electro-oculogram was recorded with two electrodes attached diagonally close to the left and right eyes and one ground electrode attached to the collar bone.
The sampling rate of the recording was 1000 Hz and a 0.03–330 Hz online band-pass filter was used.
The head position in relation to the sensors in the helmet was monitored continuously with five digitised head position indicator (HPI) coils attached to the scalp. Three HPI coils were placed on the forehead and one behind each ear. The position of the HPI coils was determined by three anatomic landmarks (nasion, left and right preauricular points) using the Polhemus Isotrak digital tracker system (Polhemus, Colchester, VT) at the beginning of the recording. An additional set of points (>100) randomly distributed over the scalp was also digitised. Electro-oculogram was recorded with two electrodes attached diagonally close to the left and right eyes and one ground electrode attached to the collar bone.
The sampling rate of the recording was 1000 Hz and a 0.03–330 Hz online band-pass filter was used.
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