Magnetom verio syngo mr b19 scanner

Preoperative MR images were obtained using a Magnetom Verio syngo MR B19 scanner (Siemens, Munich, Germany). Patients were awake during MR imaging. For T2-weighted 3-T images the parameters were as follows: repetition time, 5000 ms; echo time, 70 ms; slice thickness 2 mm; voxel size 0.7 × 0.7 × 2.0 mm; and acquisition time 8:47 min. For 3-T SWI images: repetition time, 30 ms; echo time, 20 ms; slice thickness 1 mm; voxel size 0.5 × 0.5 × 1.0 mm; and acquisition time 11:40 min. For T1-weighted 3-T images: repetition time, 1900 ms; echo time, 2.9 ms; slice thickness 1.2 mm; voxel size 1.0 × 1.0 × 1.2 mm; and acquisition time 7:07 min. Preoperative stereotactic CT parameters were as follows: kV 120; reference mAs was 390 and dose modulation was used; tube rotation 1; slice thickness 1 mm; pitch 0.55; scan length from skull base to vertex. Intraoperative CT parameters were as follows: field of view 20 cm; scan range 15 cm; total slices, 192; slice thickness 0.78 mm; acquisition time 13 s.

A 3T Siemens Magnetom Verio syngo MR B19 scanner (Erlangen, Germany) equipped with a 32‐channel head coil was used in the elder group. The same projection system as in the younger group was used to present stimuli. Functional images were collected using 32 axial slices (64 mm × 64 mm in plane, no gap) covering the whole brain with a T2*‐weighted EPI gradient echo sequence in an odd‐even interleaved sequence (FoV 224 × 224 mm, voxel size = 3.5 × 3.5 × 3.5 mm, TR = 2000 ms, TE = 38 ms, flip angle = 80°). Axial slices were acquired parallel to the AC‐PC line for 255 volumes in each run. Wholehead T1‐weighted images were collected with an MP‐RAGE sequence (96 sagittal slices, thickness = 2 mm, FoV 256 × 256 mm, no gap, spatial resolution = 1 × 1 × 2 mm, TR = 1660 ms, TE = 5.05 ms, TI = 1100 ms).