All brain images were collected on a 3-Tesla Phillips Intera Achieva system with a birdcage head coil at Vanderbilt University Medical Center, Nashville, TN.
Structural brain images were collected by three-dimensional T1-weighted magnetization prepared rapid gradient echo (MP-RAGE) sequence with TR = 2300 ms, TE = 2.92 ms, field of view of 256 × 256 mm, 256 × 256 matrix size, 176 sagittal slices, and 1 mm isotropic voxel size.
Specifically, using an inversion recovery pulse sequence, a set of brain images was collected at various inversion times (TIs).
Whole-brain images were collected on a Siemens 1.5 Tesla Vision System (Erlangen, Germany) with a standard circularly polarized head coil.
Whole brain T2* images were collected while subjects viewed pictures of high calorie (HC) foods, low calorie (LC) foods, and control (C) pictures presented in a block design.
Brain SPECT images were collected in 24 projections using time per projection of 150 s resulting in a total acquisition time of 30 min. CT imaging was carried out with a 45-kVp tube voltage in 180 projections.
In the delayed saccade paradigm 156 whole brain volume images were collected in each scanner run.
Whole brain functional images were collected using a T2*-weighted EPI sequence, sensitive to BOLD contrast (TR = 2000 ms, TE = 35 ms, image matrix = 64 × 64, FOV = 224 mm, flip angle = 80°, slice thickness = 3.0 mm, distance factor = 17%, voxel size 3.5 mm × 3.5 mm × 3 mm, 30 axial slices).
High-resolution whole brain anatomic images were collected using 3-dimensional magnetization-prepared rapid gradient echo (MPRAGE) with the following parameters: repetition time (TR) = 9.4 ms, echo time (TE) = 4.6 ms, flip angle = 15, slice thickness = 1 mm, gap = 0, field of view (FOV) = 256 mm × 256 mm, matrix = 256 × 256, slices = 155.
Whole-brain structural images were collected with a high resolution (1 mm3) Turbo Spin Echo scan that was used to align functional images.
Whole-brain functional images were collected using a T2*-weighted EPI sequence, sensitive to blood oxygen level dependent (BOLD) contrast (TR = 2000 ms, TE = 30 ms, image matrix = 64 × 64, FOV = 224 mm, flip angle = 90°, slice thickness = 3.0 mm, distance factor = 17%, voxel size 3.5 × 3.5 × 3 mm, 31 axial slices).
