Table 4. Sequence parameters of diffusion MRI datasets for each of the six collections sharing these data along with corresponding high resolution anatomical and resting state functional MRI data.
| Collection | TE | TR | BW | FS | PA | PF | PE | SO | Gap |
Recon Resolution (mm)
|
Recon Image Matrix (px)
|
Nb0 | Ndir | Bvals | Navg | TA | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Label | ms | ms | Hz/Px | % | RO | PE | SL | RO | PH | SL | min:sec | |||||||||
| All diffusion data were collected with spin echo planar imaging (SE-EPI) sequences. *Data were collected with two slightly different sequences; Bvals, the gradient strength used for diffusion weighting; BW, bandwidth per pixel; Dims, dimensions; FS, fat suppression; Gap, gap between slices; Navg, number of volumes collected for each direction and subsequently averaged; Nb0, number of volumes acquired with b=0; Ndir, number of directions acquired with diffusion weighting; PA, parallel acquisition; PE, Phase encoding; PF, Partial Fourier (half scan), SO, Slice orientation; TA, Acqusition Time; TE, echo time; TR, repetition time. For parallel acquisition the acceleration technology and dimension are listed followed by the acceleration factor, SP, SENSE acceleration in the phase encoding direction. For partial Fourier, the under-sampled dimension is listed with the undersampling factor, P, phase encoding. For slice orientation; T, transverse (axial). For phase encoding direction; RL, right-to-left; AP, Anterior to posterior. Reconstructed resolution and image dimensions refer to the images after they have been reconstructed from the k-space data, the matrix size and resolution used for the acquisition may differ. For these categories, RO, read out direction; PE, phase encoding direction, and SL, slice direction. | ||||||||||||||||||||
| ABIDEII-BNI_1 | 101 | 7,850 | 2,621.1 | Y | SP2 | None | AP | T | 0 | 1.41 | 1.41 | 3 | 192 | 192 | 48 | 1 | 32 | 2,500 | 1 | 4:34 |
| ABIDEII-IP_1 | 86 | 5,407 | 1,972.5 | Y | SP2 | P×0.683 | AP | T | 0 | 2.5 | 2.5 | 2.5 | 96 | 96 | 45 | 1 | 32 | 1,000 | 1 | 3:09 |
| ABIDEII-NYU_1 | 78 | 5,200 | 3,720 | Y | None | None | RL | T | 0 | 3 | 3 | 3 | 64 | 64 | 50 | 1 | 64 | 1,000 | 1 | 5:43 |
| ABIDEII-NYU_2 | ||||||||||||||||||||
| ABIDEII-SDSU_1* | 81.8 | 8,500 | 3,906.25 | Y | None | None | RL | T | 0 | 0.94 | 0.94 | 2 | 256 | 256 | 68 | 1 | 61 | 1,000 | 1 | 8:56 |
| 7.5 | 1,097 | 250 | Y | None | None | RL | T | 0 | 1.88 | 1.88 | 2 | 128 | 128 | 5:34 | ||||||
| ABIDEII-TCD_1 | 79 | 20,244 | 2,590.6 | Y | SP2 | None | AP | T | 0 | 1.94 | 1.94 | 2 | 128 | 128 | 65 | 1 | 61 | 1,500 | 4 | 24:21 |