3 axis gradient head coil

All fMRI data were acquired at the Massachusetts General Hospital
Martinos Center for Biomedical Imaging with a 3-axis gradient head coil in a 3
Tesla Siemens MRI System. A high-resolution T1-weighted structural image was
acquired by an isotropic multiecho MPRAGE pulse sequence for anatomic
localization of significant signal changes. Functional MRI images were acquired
using a gradient echo T2*-weighted pulse sequence [time repetition (TR)/time
echo (TE)=2000/30ms, flip angle (FA)=90°, field of view
(FOV)=192×192 mm, 48 AC-PC aligned slices, slice thickness = 3.0 mm with
0.6 mm inter-slice gap, 90 image volumes per slice, matrix size=96×96]
and a 32-channel multiarray coil. During the resting-state fMRI, which lasted
approximately nine minutes, participants were asked to keep their eyes open and
to blink normally while looking at a darkened screen and to not think about any
particular thing.

MRI data were acquired using a 3.0-T whole-body scanner (Trio-System), equipped for echo planar imaging (Siemens Medical Systems, Iselin NJ) with a 3-axis gradient head coil. Head movements were restricted using foam cushions. Images were projected using a rear projection system and E-Prime stimulus presentation software was used to show the task stimuli (Psychology Software Tools; http://www.psychology-software-tools.mybigcommerce.com). Following automated scout and shimming procedures, two high-resolution 3D MPRAGE sequences (TR=2530ms, TE=3.39ms, flip angle=7^o, voxel size = 1.3×1.0×1.3 mm) were collected for positioning of subsequent scans. FMRI images (i.e. blood oxygenation level dependent signal or BOLD) were acquired using T2* -weighted sequence (27 axial slices aligned perpendicular to the plane intersecting the anterior and posterior commissures, 5 mm thickness, skip 1 mm, TE=30ms, TR=1600ms, flip angle = 90^o).