Achieva 3.0t tx system

Imaging data were acquired at the Center of Bio-Medical Imaging Research (CBIR), Tsinghua University using a Philips Achieva 3.0T TX system with a standard 8-channel head coil. Functional images were acquired with a T2-weighted echo-planar imaging sequence (TR = 2,300 ms, TE = 30 ms, flip angle = 90°, 37 ascending slices, FOV = 256 × 256 cm, acquisition matrix = 96 × 96 × 37, voxel size = 2.5 mm × 2.5 mm × 3.45 mm). During the functional scan, participants were instructed to open their eyes, not to think anything particular, and not to fall asleep. The total duration of the resting-state scan was 508.3 s. A high-resolution, T1-weighted structural image was also obtained for each participant (TR = 8.2 ms, TE = 3.8 ms, 160 contiguous sagittal slices, flip angle. = 8°, FOV = 256 × 256 cm, acquisition matrix = 256 × 256 × 160, voxel size = 0.938 mm × 0.938 mm × 1 mm; SENSE factor: AP = 2, RL = 1.5). Participants completed the DSS outside the MRI scanner.

Both structural MRI and resting-state fMRI scanning were performed at the Center for Biomedical Imaging Research of Tsinghua University, using a Philips Achieva 3.0T TX system with a standard 8-channel head coil.
As for structural MRI data acquisition, high-resolution T1-weighted anatomical images were acquired with 160 contiguous sagittal slices (thickness = 1 mm, and flip angle = 8°). The sensitivity encoding (SENSE) parallel-imaging technique was employed to reduce scan time [31] . The SENSE acceleration factor was set to be 2 for the anterior-posterior direction, and set to be 1.5 for the right-left direction. Repetition time was set to be 8.2 ms, and echo time was set to be 3.8 ms. The acquisition matrix was 256 voxels × 256 voxels × 160 voxels, and the voxel size was 0.938 mm × 0.938 mm × 1 mm.
During resting-state fMRI scanning, all participants were instructed to stay awake with their eyes closed, and to keep their bodies physically still without thinking about anything in particular. The scanning consisted of 221 contiguous EPI volumes with the following scanning parameters: TE = 35 ms; TR = 2300 ms; number of slices = 37; flip angle = 90°; FOV = 240×240 mm 2 ; thickness = 2.5 mm; gap = 0.95 mm; acquisition voxel size = 2.5×2.5×2.5 mm 3 . The total duration of the resting-state scan was 508 s.

Participants were scanned via a 3.0T Philips Achieva 3.0T TX system with a SENSE 8-channel head coil. A High-resolution T1-weighted image was acquired for each participant with 160 contiguous sagittal slices of 1 mm thickness and 8° flip angle. SENSE factor was 2/1.5 for AP/RL. Time of repetition was 8.2 ms and time of echo was 3.8 ms. The acquisition matrix was 256 × 256 × 160 with voxel size of 0.938 mm × 0.938 mm × 1 mm.

A second, healthy subject was scanned on a Philips Achieva 3.0 T TX system, using a diffusion-weighted imaging sequence comprised of 10 b = 0 images, 25 images at b-value 700 s /mm 2 , 40 images at b = 1000 s /mm 2 , and 75 images at b = 2800 s /mm 2 . The voxel size equals 2.5 mm (isotropic). Additionally, a single b = 0 image was acquired with reverse-phase encoding to correct for EPI distortions, as well as motion and eddy current distortions using FSL TOPUP and EDDY tools (Andersson et al., 2003; (link)Smith et al., 2004) (link). A T1w-scan was acquired with a 3D TFE sequence, at voxel size 1.2 mm × 0.98 mm × 0.98 mm.