Achieva dstream 3.0 tesla scanner

MRI scans were acquired using a Philips Achieva dStream 3.0-Tesla scanner (Philips Medical Systems, Best, NL) equipped with a SENSE-32 whole-head coil. Head motion was restricted using foam inserts. Functional scans were collected with T2*-weighted echo-planar imaging sequence [TR (repetition time): 2.2 s, TE (echo time): 30 ms, flip angle: 80°; 38 transverse slices (anterior-to-posterior); FOV (field-of-view): 220 × 220 × 114.68 mm; voxel size: 2.75 mm³]. Number of volumes per participant varied due to self-paced questions (M = 241.6, s.d. = 9.93, range: 224–264). After obtaining functional scans, field maps were collected [TR: 200 ms, TE: 3.2 ms; maximum: 58 slices (optimum: 29 slices); voxel size: 2.75 mm³] for distortion correction. We acquired a structural 3D T1-FFE scan prior to the functional scans (TR: 7.9 ms, TE: 3.5 ms, flip angle: 8°; 155 transverse slices; FOV: 250 × 195.83 × 170.5 mm; voxel size: 1.10 mm³; duration: 4:11 min).

MRI scans were acquired using a Philips Achieva dStream 3.0-Tesla scanner (Philips Medical Systems, Best, NL) equipped with a SENSE-32 whole-head coil. Head motion was restricted using foam inserts. First, we acquired a structural 3D T1-FFE scan (TR: 7.9 ms, TE: 3.5 ms, flip angle: 8°; 155 transverse slices; FOV: 250 ×195.83 ×170.5 mm; voxel size: 1.10 mm³; duration: 4:11 min). Next, fMRI images were collected with T2 * -weighted echo-planar imaging (EPI) sequence (TR: 2.2 s, TE: 30 ms, flip angle: 80°; 38 transverse slices (anterior-to-posterior); FOV: 220 × 220 × 114.68 mm; voxel size: 2.75 mm³). Number of volumes per participant varied due to self-paced questions (M = 237.8, SD = 10.5, range: 221–273). After obtaining functional scans, we collected field maps for correction of distortion in the EPIs (TR: 200 ms, TE: 3.2 ms; maximum: 58 slices (optimum: 29 slices); voxel size: 2.75 mm³).