All recordings were conducted in a one-layer MSR with active shielding engaged. With an acquisition bandwidth of 0.1–330 Hz, neuromagnetic responses were sampled continuously at 1 kHz using an Elekta MEG system with 306 magnetic sensors, including 102 magnetometers and 204 planar gradiometers (Elekta, Helsinki, Finland). Using MaxFilter (v2.2.1; Elekta), MEG data from each subject were individually corrected for head motion and subjected to noise reduction using the signal space separation method with a temporal extension (Taulu et al., 2005 ; Taulu and Simola, 2006 (link)). All analyses for this study were focused on the data collected by the 204 gradiometers. For motion correction, the position of the head throughout the recording was aligned to the individual’s head position when the recording was initiated.
204 planar gradiometers
Manufactured by Elekta
The 204 planar gradiometers is a lab equipment product by Elekta. It functions as a sensitive sensor for detecting and measuring magnetic fields.
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Lab products found in correlation
4 protocols using 204 planar gradiometers
1
MEG Data Acquisition and Preprocessing
2
Multimodal Neuroimaging of Interictal Spikes
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MEG was recorded with simultaneous scalp-EEG for 40-min periods during awake and sleep conditions using a 1000 Hz sampling rate and band-pass filter between 0.03 and 330 Hz, with a whole-head system that consisted of 204 planar gradiometers (Elekta, Helsinki, Finland). The location of the dipole sources that best fit the measured magnetic fields was calculated using a single ECD model at the peak of each spike. We selected and presented ECDs that showed >90% goodness-of-fit value for the evaluation. The estimated ECDs were plotted on the co-registered [11C]K-2 images using the PMOD Fusion tool v3.7 (PMOD Technologies). We qualitatively evaluated the locational relationship between the estimated ECDs and brain areas with high [11C]K-2 uptake.
3
Magnetoencephalography data preprocessing
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Neuromagnetic data were recorded using an Elekta MEG system with 306 sensors (204 planar gradiometers; Elekta, Helsinki, Finland) within a one-layer magnetically shielded room with active shielding. MEG data were sampled at 1kHz using a bandwidth of .1 to 330 Hz. Recorded data were corrected for head motion per participant and per session, and noise reduction was applied via signal space separation with a temporal extension (tSSS; Taulu and Simola, 2006 (link); Taulu et al., 2005 (link)).
4
Magnetoencephalography data preprocessing
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