Table 3.
Brain MRI sequence parameters
| Sequence | T1 | T2 | DWI | fMRI | MRS* | ||||||
| Type | MPRAGE | MEMPRAGE | SPACE | Shell 1 | Shell 2 | Shell 3 | Blip up/down | rs-fMRI | Blip up/down | rTPJ | PFC |
| TR (ms) | 2100 | 2690 | 3200 | 3300 | 3300 | 3300 | 3300 | 1500 | 3980 | 2000 | 2000 |
| TE (ms) | 2.22 | 2.14/3.8/ 5.48/7.15 |
458 | 71.0 | 71.0 | 71.0 | 71.0 | 33.0 | 33.0 | 68.00 | 68.00 |
| TI (ms) | 1000 | 1650 | 0 | – | – | – | – | – | – | – | – |
| Flip angle (degrees) | 8 | 8 | – | 85 | 85 | 85 | 85 | 85 | 85 | – | – |
| Slices | 208 | 192 | 208 | 64 | 64 | 64 | 64 | 60 | 60 | – | – |
| Voxel size (mm3) | 0.80 | 0.90 | 0.80 | 2.40 | 2.40 | 2.40 | 2.40 | 2.50 | 2.50 | 30 | 30 |
| FoV read (mm) | 256 | 254 | 256 | 260 | 260 | 260 | 260 | 255 | 255 | – | – |
| FoV phase (%) | 93.8 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | – | – |
| Matrix | 320×320 | 288×288 | 320×320 | 110×110 | 110×110 | 110×110 | 110×110 | 104×104 | 104×104 | – | – |
| Band width (Hz/Px) | 220 | 790 | 744 | 2392 | 2392 | 2392 | 2392 | 1718 | 1718 | 1850 | 1850 |
| Echo spacing (ms) | 6.30 | 9.20 | 3.52 | 0.50 | 0.50 | 0.50 | 0.50 | 0.67 | 0.67 | – | – |
| Orientation | S | S | S | T | T | T | T | T | T | T | T |
| B value (s/mm2) | – | – | – | 2800 | 2000 | 1000 | 0 | – | – | – | – |
| No of directions/b=0 s | – | – | – | 63/6 | 45/5 | 25/5 | 6 | – | – | – | – |
| Multiband factor | – | – | – | 2 | 2 | 2 | 2 | 3 | 3 | – | – |
| Parallel imaging - GRAPPA | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | – | – |
| Acquisition time | 5 m 48 s | 3 m 44 s | 3 m 52 s | 3 m 49 s | 3 m 6 s | 2 m | 21 s (x 2) | 6 m 57 s | 28 s (x 2) | 4 m 36 s | 4 m 36 s |
| Averages | – | – | – | – | – | – | – | – | – | 64×2 | 64×2 |
| Odd /even inversion pulse (ppm) | – | – | – | – | – | – | – | – | – | 7.50/1.90 | 7.50/1.90 |
*MCRI site only.
FoV, field of view; GRAPPA, generalised autocalibrating partial parallel acquisition; MEMPRAGE, multiecho magnetisation-prepared rapid gradient-echo; MPRAGE, magnetisation prepared rapid gradient-echo; MRS, magnetic resonance spectroscopy; PFC, prefrontal cortex; Px, pixels; rs-fMRI, resting state functional MRI; rTPJ, right temporoparietal junction; S, sagittal; T, transversal; TE, echo time; TI, inversion time; TR, repetition time.