Cxk4 short bore excite 2 mr system

All imaging data included in the longitudinal statistical analysis of group differences reported in the Results were collected with the same 3 Tesla CXK4 short-bore Excite-2 MR system (General Electric, Milwaukee, WI), with an 8-channel phase-array head coil at the UCSD Keck FMRI Center. Eight high-bandwidth receivers for ultra-short TR times reduced signal distortions and signal dropout. Sessions involved a scout scan for head placement and slice selection, followed by a sagittal high-resolution 3d T1-weighted anatomical MRI (FOV 24 cm, 256 × 256 × 192 matrix, 0.94 × 0.94 × 1 mm voxels, 176 slices, TR=20 ms, TE=4.8 ms; flip angle 12°; 9 minutes).

High-resolution anatomical and functional images were collected at the University of California at San Diego Center for Functional MRI on a 3-Tesla CXK4 short bore Excite-2 MR system (General Electric, Milwaukee, WI) with an eight-channel phase-array head coil. Participants were positioned on the scanner table, and the head was stabilized within the head coil using foam cushions to help minimize movement (NoMoCo, La Jolla, CA). Scan sessions involved a 10-s scout scan to assure good head placement and slice selection covering the whole brain followed by a high-resolution T1-weighted sequence using a sagittally acquired spoiled gradient recalled sequence (field of view = 24 cm, 256 × 256 × 192 matrix, 0.94 × 0.94 1 mm voxels, 176 slices, repetition time = 20 ms, echo time = 4.8 ms; flip angle 12°, acquisition time = 7:26 min).

Participants were scanned in a 3T GE CXK4 short bore Excite-2 MR system with an 8-channel phase-array head coil. A sagittally acquired spoiled gradient recalled 3d T1-weighted sequence (field of view [FOV] 24 cm, 256 × 256 × 192 matrix, .94 × .94 × 1 mm voxels, 176 slices, repetition time [TR] = 20 ms, echo time [TE] = 4.8 ms; flip angle 12°, 7:26 minutes) assisted with registration and anatomic standardization. fMRI BOLD response contrast during the alcohol cue reactivity task was measured with 3 T2*-weighted axially acquired echo-planar imaging sequences (FOV = 24 cm, 64 × 64 matrix, 3.75 × 3.75 × 3.8 mm voxels, 32 slices, TE = 30 ms, TR = 2000ms, flip angle 90°, ramped bandwidth 250 KHz; total acquisition time 8:32 minutes). Task stimuli were back projected from a laptop to a screen at the foot of the scanner bed visible via an angled mirror attached to the head coil. Picture ratings and reaction time data were logged with a response box designed for MRI studies (Current Designs, Pittsburgh, PA). Field map acquisitions employed 2 different echo times to unwarp field inhomogeneities and signal.