DiSCo reference volumes, replayed from the pack
Pre-replayed images of the DiSCo substrate on the dataset's own 40^3 grid (25 um voxels; the NIfTI affine is
the identity, as in the dataset's files, so these overlay DiSCo_DWI.nii.gz directly). Every volume is S/S0
per voxel in float32, 0 where the pack holds no walkers (the free-water voxels farther than 46 um from every
strand, and the volume outside the strands' reach). disco_replay_floor.nii.gz is the certificate's per-voxel
Monte-Carlo floor beside them (pass 1: median 0.035 on the mask).
| file | what | tissue | bands / modes |
|---|---|---|---|
disco_replay_bare.nii.gz |
DiSCo's 364-measurement protocol, bare diffusion (the dataset's own simulation) | none | 64 / 0 |
disco_replay_3T.nii.gz |
the same protocol with white matter at 3 T | T2 50/55 ms, rho 1.16 um/s, chi -0.1 ppm | 64 / 32 |
disco_replay_7T.nii.gz |
the same at 7 T | T2 47/47 ms, rho 1.16 um/s, chi -0.1 ppm | 64 / 32 |
disco_acq_clinical.nii.gz |
b = 1000, 30 directions, delta/Delta 12/24 ms | none | plan |
disco_acq_research.nii.gz |
b = 1000/2000/3000, 90 directions each, 17/30 ms | none | plan |
disco_acq_c2.nii.gz |
b = 6000, 60 directions, 8/20 ms (275 mT/m) | none | plan |
disco_acq_ogse.nii.gz |
cosine OGSE 50 Hz, b = 1000, 60 directions | none | plan |
The protocol is the dataset's as it simulated it: one echo time of 53.5 ms, ideal pulses, the three upper
shells at the ActiveAx ex vivo timings (10.2/16.7, 7.6/45.9, 17.7/35.8 ms; Alexander et al. 2010), the
b = 1000 shell at the first shell's timing (the dataset does not state it). Gradient tables are beside each
volume (.bvals in s/mm^2, .bvecs as 3 x N). The tissue values are the biophysical catalogue's
(dmipy-sim canonical_white_matter); the volumes are one tissue choice, not a ground truth.
*_timing.json records the plan each volume was read with (bands, field modes, tiers, bytes per row, bytes
and seconds streamed from this dataset's disco/ layout). disco_replay_compare.json is the bare volume
against the dataset's noise-free images (per shell: median and rms |dS/S0|, correlation) -- the replay is
higher by ~1 % of S0 on every shell because the dataset's tubes are triangle meshes inscribed in the nominal
circles (their intra volume is 0.953 of the pack's); the residual scatter is pass 1's floor. The layout these
were read from includes the repair of dmipy-sim#295: 332 voxels whose pool the plan had clipped at two walkers
(their certified floors ran to 1.0; the top shell's correlation with the dataset was 0.84 before, 0.98 after)
were rewalked at (share / 0.008)^2 walkers and appended with union weights (columnar.repair in the manifest). tract/
holds the scoring records: CSD + probabilistic tracking + the 16 x 16 streamline-count matrix against the
dataset's connectivity matrices (its own images through the same pipeline score 0.904 noise-free and 0.905 at
its SNR-30 release; the replayed protocol at SNR 30 scores 0.912 +/- 0.003 over three seeds).
Regenerated after every pass of the fill; the pack manifest these were read from is recorded in each timing
record's uri and in manifest_sha256.
manifest_sha256: 294dd9af218d8bb06728aed0a0e4d71e174415b3185a0c01b983b4ecf7c4e946