Magnetoencephalography and Structural MRI Acquisition

Recordings were conducted in a magnetically-shielded room 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 (Elekta, Helsinki, Finland). MEG data from each participant were individually-corrected for head motion and subjected to noise reduction using the signal space separation method with a temporal extension39 (link). Each participant’s MEG data were then coregistered with their structural T1-weighted MRI data using BESA MRI (Version 2.0; BESA GmbH, Gräfelfing, Germany). These neuroanatomic images were acquired with a Philips Achieva 3T X-series scanner using an eight-channel head coil and a 3D fast field echo sequence with the following parameters: TR: 8.09 ms; TE: 3.7 ms; field of view: 24 cm; matrix: 256 × 256; slice thickness: 1 mm with no gap; in-plane resolution: 0.9375 × 0.9375 mm; sense factor: 1.5. The structural MRI volumes were aligned parallel to the anterior and posterior commissures and were transformed into standardized space after source imaging (i.e., beamforming)40 (link)41 (link).

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Wilson T.W., Proskovec A.L., Heinrichs-Graham E., O’Neill J., Robertson K.R., Fox H.S, & Swindells S. (2017). Aberrant Neuronal Dynamics during Working Memory Operations in the Aging HIV-Infected Brain. Scientific Reports, 7, 41568.

Publication 2017

MEG system 306 magnetic sensors Achieva 3T X-series scanner eight-channel head coil

Echo Head

Corresponding Organization :

Other organizations : University of Nebraska Medical Center, University of North Carolina at Chapel Hill

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Variable analysis

independent variables

Magnetic shielding (active shielding engaged)

dependent variables

Neuromagnetic responses

control variables

Acquisition bandwidth of 0.1–330 Hz
Sampling rate of 1 kHz
306 magnetic sensors (Elekta MEG system)
Head motion correction
Noise reduction using signal space separation method
Coregistration of MEG data with structural T1-weighted MRI data
Structural MRI acquisition parameters (TR: 8.09 ms; TE: 3.7 ms; field of view: 24 cm; matrix: 256 × 256; slice thickness: 1 mm with no gap; in-plane resolution: 0.9375 × 0.9375 mm; sense factor: 1.5)
Alignment of structural MRI volumes parallel to the anterior and posterior commissures
Transformation of structural MRI volumes into standardized space after source imaging (i.e., beamforming)

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