Ge750 3.0 t scanner

TN patients stopped their pain medication for at least 24 h prior to MRI scan. MRI data acquisition was performed on a GE750 3.0 T scanner with an eight-channel phase array head coil. High-resolution structural images were collected using a sagittal Fast Spoiled Gradient-Echo (FSPGR) sequence with the following parameters: repetition time (TR), 6.7 ms; echo time (TE), 2.9 ms; flip angle, 7°; slice thickness, 1 mm; no gap; 192 sagittal slices; field of view (FOV), 256 × 256 mm² and voxel size = 1 × 1 × 1 mm³. The functional images were obtained using an echo-planar imaging (EPI) sequence with the following parameters: repetition time = 2000 ms, echo time = 30 ms, flip angle = 90°, thickness/gap = 3.5 mm/0.5 mm, slices = 36, field of view = 224 × 224 mm², voxel size = 3.5 × 3.5 × 3.5 mm³, and a total of 240 volumes. During the scan, participants were fitted with soft earplugs and instructed to keep their eyes closed, to remain motionless, and not to think of anything in particular. After the scanning, a simple questionnaire indicated that no participants had fallen asleep.

Scans were performed using a GE750 3.0T scanner at PLA General Hospital. Participants were fitted with electrostatic headphone to mitigate acoustic scanner noise. The rs‐fMRI was obtained using an echo‐planar imaging (EPI) sequence with the following parameters: repetition time = 2,000 ms, echo time = 30 ms, flip angle = 90°, thickness/gap = 3.5 mm/0.5 mm, slices = 36, field of view = 224 × 224 mm² and voxel size = 3.5 × 3.5 × 3.5 mm³, and a total of 240 volumes. The high‐resolution anatomical images were acquired using a sagittal fast spoiled gradient‐echo (FSPGR) T1‐weighted sequence with the following parameters: repetition time = 6.7 ms, echo time = 2.9 ms, flip angle = 7°, thickness = 1 mm, slices = 192, field of view = 256 × 256 mm² and voxel size = 1 × 1 × 1 mm³. During the scan, all subjects were instructed to keep their eyes closed, to remain awake, and not to think of anything in particular. Data preprocessing was performed using Statistical Parametric Mapping (SPM8, http://www.fil.ion.ucl.ac.uk/spm) and Data Processing Assistant for Resting‐State fMRI (DPARSF; Chao‐Gan & Yu‐Feng, 2010), including removing first 10 time points, slice‐timing, realignment, spatial normalization, line detrending, nuisance covariates regression, and band‐pass filtering. For the details of preprocessing, see in Data S1.