Each scan was collected in accordance with harmonized procedures on
Siemens Prisma, Philips, or GE 750 3T MRI scanners. Imaging acquisition
protocols specific to ABCD have been described by Casey et al. (2018) (link). Twenty cumulative minutes of
resting-state data was collected across two sets of two five-minute
acquisition periods, while subjects were instructed to keep their eyes open
and fixed on a crosshair. This increased the probability of collecting
enough data with low motion per ABCD’s standards (>12.5 min of
data with framewise displacement (FD) < 0.2 mm) (Power et al. 2014 (link)). Resting-state scans were
acquired using an echo-planar imaging sequence in the axial plane, with the
following parameters: TR = 800 ms, TE = 30 ms, flip angle = 90°,
voxel size = 2.4 mm3, 60 slices. Only images without clinically
significant incidental findings (mrif_score = 1 or 2) that
passed all ABCD quality-control parameters
(imgincl_rsfmri_include = 1) were included in analysis.
Image processing steps have been previously described by Hagler et al. (2019) (link).
Siemens Prisma, Philips, or GE 750 3T MRI scanners. Imaging acquisition
protocols specific to ABCD have been described by Casey et al. (2018) (link). Twenty cumulative minutes of
resting-state data was collected across two sets of two five-minute
acquisition periods, while subjects were instructed to keep their eyes open
and fixed on a crosshair. This increased the probability of collecting
enough data with low motion per ABCD’s standards (>12.5 min of
data with framewise displacement (FD) < 0.2 mm) (Power et al. 2014 (link)). Resting-state scans were
acquired using an echo-planar imaging sequence in the axial plane, with the
following parameters: TR = 800 ms, TE = 30 ms, flip angle = 90°,
voxel size = 2.4 mm3, 60 slices. Only images without clinically
significant incidental findings (mrif_score = 1 or 2) that
passed all ABCD quality-control parameters
(imgincl_rsfmri_include = 1) were included in analysis.
Image processing steps have been previously described by Hagler et al. (2019) (link).