Tim trio 3t mr

Blood oxygenation level dependent (BOLD) contrast functional images were acquired with echo-planar T2^*-weighted imaging (EPI) using a Siemens Tim Trio 3T MR system with a 12 channel head coil. Each image volume consisted of 26 sequential 3 mm thick slices (interslice gap, 0.75 mm; in-plane resolution, 2.4 × 2.4 mm; field of view, 234 by 234 mm; matrix size, 98 by 98; flip angle, 74 degrees; echo time, 33 ms; repetition time, 2 s). Slice acquisition was transverse oblique, angled to avoid the eyes, and provided near whole brain coverage. These acquisition parameters were chosen to minimize voxel size while covering all brain regions of interest. In some subjects, cerebellum and part of motor cortex was not covered by our slice prescription. To aid co-registration, an additional eight echo-planar volumes were acquired using the same parameters as the task data but with an increased number of slices and adjusted TR. Data were acquired in nine scanning runs lasting approximately 5 min each. The first five volumes of each run were discarded to allow for T1 equilibration effects. A T1-weighted structural scan was also acquired at 1 mm isotropic resolution. This was acquired prior to the functional data.

Blood oxygenation level dependent (BOLD) contrast functional images were acquired with echo-planar T2*-weighted imaging (EPI) using a Siemens Tim Trio 3T MR system with a 12 channel head coil. Each image volume consisted of 48 interleaved 2 mm thick slices (interslice gap, 0.5 mm; inplane resolution, 3 × 3 mm; matrix size, 64 × 64; repetition time, 3 s; echo time, 30 ms; flip angle, 90°; bandwidth, 2232 Hz). Slice acquisition was transverse oblique, angled to avoid the eyes as far as possible while maintaining coverage of ventral temporal cortex. Data were acquired in five scanning runs of approximately 8 min. The first five volumes of each run were discarded to allow for T1 equilibration effects. T1-weighted structural images were acquired at a resolution of 1 × 1 × 1 mm.