A 4T Bruker MedSpec system with a Siemens Trio console was used for
acquiring MR images (Siemens, Erlangen, Germany) with an 8-channel
transmit-receive head coil. The T1 data (1×1×1
mm3) were acquired with a 3D sagittal
magnetization prepared rapid gradient echo, and the T2 data
(0.9×0.9×3 mm3) were acquired with a
2D axial turbo-spin echo sequence. A dual spin echo echo planar imaging sequence
was used to acquire the diffusion-weighted data (TE=77
ms, TR=6000 ms, flip angle of
90°), using six diffusion-encoding directions at b=800
s/mm2 and one at b=0
s/mm2. The DTI data were acquired with a nominal
in-plane resolution of 2×2 mm2 from 40
3-mm-thick interleaved slices (no gap). To reduce
geometrical distortions, twofold parallel imaging acceleration was applied. Four
scans were averaged after acquisition to boost signal-to-noise. Further details
have been reported (Kuceyeski et al.,
2013 ).
acquiring MR images (Siemens, Erlangen, Germany) with an 8-channel
transmit-receive head coil. The T1 data (1×1×1
mm3) were acquired with a 3D sagittal
magnetization prepared rapid gradient echo, and the T2 data
(0.9×0.9×3 mm3) were acquired with a
2D axial turbo-spin echo sequence. A dual spin echo echo planar imaging sequence
was used to acquire the diffusion-weighted data (TE=77
ms, TR=6000 ms, flip angle of
90°), using six diffusion-encoding directions at b=800
s/mm2 and one at b=0
s/mm2. The DTI data were acquired with a nominal
in-plane resolution of 2×2 mm2 from 40
3-mm-thick interleaved slices (no gap). To reduce
geometrical distortions, twofold parallel imaging acceleration was applied. Four
scans were averaged after acquisition to boost signal-to-noise. Further details
have been reported (
2013