Type | Parameters | Min |
---|---|---|
Localizer and calibration | Â | 2 |
3D SPGR T1-weighted, for online placement of VOI and its offline tissue segmentation | 256 x 256 matrix; 170 sagittal slices; 1 mm isotropic resolution, no inter-slice gap; TR = 11.3 s; TE = 4.2 ms; flip angle = 20 deg. | 7 |
1H-MRS volume of interest (VOI) | Online VOI placement; shimming (values are carried over to each subsequent 1H-MRS acquisition) | 6 |
NAA concentration levels and T2 time constants of NAA | PRESS; TR = 3 s; TEs = 80, 120, 180, 350, 600 ms; NEX = 64 | 25 |
T2 time constants of water | TR = 10 s; TEs = 50, 60, 80, 120, 180, 350, 600, 800, 1000 ms; NEX = 4 | 20 |
Diffusion-weighted images | TR = 8.5 s; TE 80–90 ms; flip angle = 90 deg; 54 non-collinear diffusion weighting directions, b-factor of 1000 s/mm2; 6 acquisitions, b-factor of ~ 0 s/mm2; 256 x 256 matrix; 260 FOV; 1.02 x 1.02 x 3 mm3 voxels; NEX = 1; acquisition of field maps. | 25 |