Achieva x series scanner

MRI data were acquired with a 3 T Philips Achieva X‐series scanner using an eight‐channel head coil. The resting‐state fMRI sequence was collected with a T2* sequence (repetition time [TR] = 2000 ms; echo time [TE] = 35 ms; voxel size = 1.7 × 1.7 × 3.5 mm; 90° flip angle; 240 mm field of view, 33 axial slices; 480 volumes). Participants were instructed to stay awake while closing their eyes. In the same session, a high‐resolution T1‐weighted anatomical scan was collected (TR = 8.09 ms; TE = 3.7 ms; 256 × 256 matrix; voxel size = 0.9375 × 0.9375 × 1 mm; sense factor: 1.5).

Participants were scanned with a 3T Phillips Achieva X-series scanner at Centro Diagnostico Granada in Spain. For each participant, a 3D volume was acquired using a T1-weighted turbo-gradient-echo sequence (3D-TFE) in the sagittal plane, with a 0.94 × 0.94 × 1.0 mm resolution (160 slices, FOV = 240 × 240 mm², matrix 256 × 256), TR = 8.3 ms, TE = 3.8 ms, and flip angle = 8°). MRI images were transferred to a Linux workstation for pre-processing and regional brain volumes were extracted using the automated FreeSurfer image analysis suite version 4.1.0 (http://surfer.nmr.mgh.harvard.edu/). The automated FreeSurfer pipeline included motion correction^{65 (link)}, non-uniform intensity normalisation (N3) at 500 iterations to correct for intensity non-uniformity artefacts (increased from the default number of iterations of 4)^{66 (link)}, automated Talairach transformation, removal of non-brain tissue^{67 (link)}, and parcellation of neuroanatomical measures, which were extracted for further statistical analysis.