12 channel phase array head coil

The fMRI session was conducted ten to twelve hours after each individual's wake up time that was determined by the MCTQ. Scanning was performed on a 3 Tesla scanner (Siemens, Erlangen, Germany) using standard gradients and a 12-channel phase array head coil. Participants lay in a supine position. Head movement was limited by foam padding within the head coil. To ensure optimal visual acuity, participants were offered MRI-compatible glasses if necessary.
The experimental runs comprised 223 whole-brain echo planar imaging (EPI) scans. These were preceded by three initial dummy scans allowing for signal saturation effects. Thirty-two slices (3 mm thickness, distance factor 40%) were positioned parallel to the AC/PC line. The following parameters were applied: matrix size 64 x 64; field-of-view (FOV), 200 mm x 200 mm; echo time (TE), 30 s; repetition time (TR), 1.94 s. For anatomical localization, a magnetization-prepared rapid gradient echo (MP-RAGE) sequence was acquired during the same imaging session (TR = 2250 ms; TE = 3.03 ms; ST = 1 mm; FOV = 256 x 256 mm; voxel size = 1.0 x 1.0 x 1.0 mm).

Magnetic resonance imaging data were collected using a 3.0 T MRI system (Siemens, Trio Tim, Erlangen, Germany) and a 12-channel phase-array head coil. Conventional brain axial fluid-attenuated inversion recovery (FLAIR) sequence was obtained to exclude visible brain abnormalities. The high-resolution 3D structural T1-weighted images were acquired by a three-dimensional (3D) magnetization- prepared rapid gradient-echo sequence (MPRAGE) in sagittal orientation. The imaging parameters were as follows: repetition time (TR) = 1800 ms, echo time (TE) = 2.13 ms, inversion time (TI) = 1100 ms, flip angle (FA) = 9°, field of view (FOV) = 256 mm × 256 mm, matrix size = 256 × 256, number of slices = 192, slice thickness = 1 mm, resulting an isotropic voxel size of 1 mm × 1 mm × 1 mm. Participants were instructed to stay awake, relax, and close their eyes during the resting-state data acquisition, then a gradient-echo-planar imaging (EPI) pulse sequence was used to collect the resting-state functional MRI (rs-fMRI) data, and the parameters were as follows: TR = 2000 ms, TE = 30 ms, slice thickness = 3 mm, inter-slice gap 1 mm, number of slices = 35, FOV = 220 mm × 220 mm, matrix size = 64 × 64, FA = 9°. The parameters resulted in an anisotropic voxel size of 3.4 mm × 3.4 mm × 3.0 mm. The total acquisition time of the resting-state fMRI scan was 6.08 min with 180 volumes.