Skip to main content

Table 4 MRI sequence parameters

From: Study protocol: Insight 46 – a neuroscience sub-study of the MRC National Survey of Health and Development

  MPRAGE (3D T1) SPACE (3D T2) IR-SPACE (3D FLAIR) rs-fMRI 3D T2*/SWI Diffusion Field mapping ASL
Voxel resolution (mm3) 1.1 × 1.1 × 1.1 1.1 × 1.1 × 1.1 1.1 × 1.1 × 1.1 3 × 3 × 4 0.86 × 0.86 × 1.5 2.5 × 2.5 × 2.5 3 × 3 × 3 3.75 × 3.75 × 4
Matrix size 256 × 256 × 208 256 × 256 × 176 256 × 256 × 176 64 × 64 × 36 256 × 192 × 96 96 × 96 × 58 64 × 64 × 55 64 × 56 × 36
FoV (read x PE) (mm) 282 × 282 282 × 282 282 × 282 192 × 192 220 × 165 240 × 240 192 × 192 240 × 210
Slice coverage (mm) 229 194 194 144 144 145 165 144
Orientation Sagittal Sagittal Sagittal Transverse obl Transverse obl Transverse obl Transverse obl Transverse obl
PE direction A > > P A > > P A > > P A > > P R > > L A > > P R > > L A > > P
TE (ms) 2.92 409 402 30 4.92; 9.84; 19.2 103 4.92; 7.38 20.26
TR (ms) 2000 3200 5000 2020 27 8000 688 4000
Flip angle (°) 8 Variable Variable 75 15 90/180/180 60 90/160/160/160...
Acq bandwidth (Hz/pix) 240 751 751 2112 400/400/140 1578 260 2298
Parallel imaging ×2 ×2 ×2 ×2 ×2 ×2 None None
Total scan time 5 min 06 s 4 min 43 s 6 min 27 s 9 min 27 s 3 min 48 s 10 min 16 s; 5 min 28 s 1 min 31 s 5 min 20s
Other sequence-specific parameters Water selective excitation pulse
TI = 870 ms
Water selective excitation pulse
Turbo factor 141
Slice TF 2
Water selective excitation pulse
Turbo factor 141
Slice TF 2
T2 sel IR
TI = 1800 ms
Fat saturation
277 volumes
\( \raisebox{1ex}{$7$}\!\left/ \!\raisebox{-1ex}{$8$}\right. \) partial Fourier along PE1/2
Flow comp for first TE
Monopolar read gradient
2 non-zero b- values:
b = 2000 s/mm2 64 dir
b = 700 s/mm2 32 dir
12 x b = 0 s/mm2 interspersed
¾ partial Fourier
2D multi-slice dual gradient echo 10 averages
pCASL labeling
4-shot 3D GRASE
Turbo Factor 14
EPI Factor 28
Labeling duration 1.8 s
Post-labeling delay 1.8 s
Background suppression