Signa 3t scanner

The modified Flanker task [31 (link)] is an event-related task designed to evaluate response inhibition and interference suppression. Each session consisted of four experimental conditions and a total of 145 trials. Each trial was presented for 800 ms that included five symbols with the central arrow pointing left or right, flanked by four symbols, two on each side. In three conditions (‘congruent’, ‘incongruent’, ‘neutral’), the subjects were asked to indicate the direction of the central arrow on the screen while ignoring the four flankers. During the ‘No-Go’ condition, the subjects were instructed to withhold their motor response when the flankers were ‘X’s. In current project, we limited our analysis to the correct trials in the No-Go condition to focus on response inhibition process.
BOLD fMRI was performed on a GE Signa 3T scanner. A gradient EPI sequence was used to acquire 300 images (26 axial slices, 4 mm thickness with 1 mm gap, in-plane resolution = 3.75 × 3.75 mm², FOV = 24 cm², matrix = 64 × 64, TR/TE = 2000/28 ms, flip angle = 90°).
Images were preprocessed following the same procedures as NBack task (slice-timing correction, motion correction, spatial normalization and smoothing) in SPM5. A contrast image for response inhibition (No-Go) was generated per subject per session using the correct trials only.

Before brain imaging between 0800 and 0900 hours, eating-disorder individuals ate their meal plan breakfast; controls had a breakfast matched in quality and calories to the average meal plan breakfast. Brain images were acquired on a GE Signa 3T scanner: (1) diffusion-weighted imaging (DWI) included 25 DWI diffusion directions and one T2-weighted (b=0) baseline image; 45 slices per image in anterior–posterior commissure orientation (128x128 matrix, repetition time (TR)/echo time (TE)=16 000/82.6 ms, field of view=26 cm, b-value=1000, ASSET, slice thickness/gap=2.6/0 mm). (2) fMRI T2* weighted echo-planar imaging for blood oxygen-dependent functional activity was performed, voxel size 3.4 × 3.4 × 2.6 mm, TR 2100 ms, TE 30 ms, angle 70°, 30 slices, interleaved acquisition and 2.6 mm slice thickness with 1.4 mm gap.

We performed BOLD fMRI using a GE Signa 3T scanner (gradient-echo-planar-imaging sequence, time repetition/time echo = 2000/30 ms; 26 interleaved slices, thickness = 4 mm, gap = 1 mm; voxel size = 3.75 × 3.75 × 5 mm; scans = 260; flip angle = 90°; field of view = 24 cm; and matrix = 64 × 64) while subjects performed the emotional variable attentional control (EVAC) task. The first 4 scans were discarded to allow for signal saturation.

Structural brain images were acquired on a GE Signa 3T scanner. Diffusion weighted images included 25 diffusion directions and one T2-weighted (b = 0) baseline image. Each image included 45 slices acquired in anterior-posterior commissure orientation (128 × 128 matrix, TR/TE = 16,000/82.6 ms, field of view = 26 cm, b-value = 1000, ASSET, slice thickness/gap = 2.6/0 mm).