Table 2.
The table summarizes compliance report for some OpenNeuro datasets that exhibit deviations in acquisition protocol. For each of these datasets, the table shows the modality, the associated suffix for various tasks/acquisition, the percentage of non-compliant & compliant subjects for each modality, and the parameters which were found to be non-compliant i.e. Repetition Time (TR), Echo Time (TE), and Flip Angle (FA). Some minor cases were observed in Phase Encoding Direction (PED), Phase Encoding Steps (PES), Sequence Variant and Pixel Bandwidth (PB). Thus, mrQA provides the ability to automatically discover scanner-related variance in MR datasets. Automatic compliance checks are especially important for large datasets which exhibit non-compliance rate below 1% because manual/ad-hoc checks are ineffective at detecting these subtle issues
| Dataset | Modality | Differentiating Entitiesb | Vendor | #Non-Compliant Subjects | Total Subjects | Parameters | #Compliant Subjects | ||
|---|---|---|---|---|---|---|---|---|---|
| dwi | 21 | 27.63% | 76 | PB | 55 | 72.36% | |||
| ds000201 | fmap | GE | 24 | 28.23% | 85 | PED, PB, TR | 61 | 71.76% | |
| ds003826 | anat | t1w | Siemens | 2 | 1.47% | 136 | PES, SV | 134 | 98.52% |
| anat | acq-cube_t2w | 39 | 25.49% | 153 | TE, TR | 114 | 74.5% | ||
| dwi | dir-unflipped | 2 | 1.39% | 143 | PB | 141 | 98.6% | ||
| fmap | acq-bold | 1 | 1.69% | 59 | PED | 58 | 98.3% | ||
| fmap | acq-dwi | 2 | 3.03% | 66 | PED, PB | 64 | 96.96% | ||
| func | task-rest_dir-forward | 6 | 4.61% | 130 | FA, PED | 124 | 95.38% | ||
| func | task-rest_dir-reverse | 40 | 31% | 129 | FA, PED | 89 | 68.99% | ||
| ds004215 | perf | asl | GE | 1 | 0.7% | 142 | TR | 141 | 99.29% |
| anat | t1w | 92 | 34.71%a | 265 | PES, PB | 173 | 65.28% | ||
| dwi | 112 | 42.74% | 262 | PB, TR | 150 | 57.25% | |||
| func | task-bart | 7 | 2.66% | 263 | PED | 256 | 97.33% | ||
| func | task-bht | 8 | 3.1% | 258 | PED | 250 | 96.89% | ||
| func | task-pamnec | 5 | 2.41% | 207 | PED | 202 | 97.58% | ||
| func | task-pamret | 6 | 2.88% | 208 | PED | 202 | 97.11% | ||
| func | task-rest | 9 | 3.35% | 268 | PED | 259 | 96.64% | ||
| func | task-scap | 9 | 3.35% | 268 | PED | 259 | 96.64% | ||
| func | task-stopsignal | 9 | 3.38% | 266 | PED | 257 | 96.61% | ||
| ds000030 | func | task-taskswitch | Siemens | 9 | 3.38% | 266 | PED | 257 | 96.61% |
| fmap | acq-GE | 1 | 0.31% | 317 | PED | 316 | 99.68% | ||
| fmap | acq-SE | 1 | 0.44% | 227 | PED | 226 | 99.55% | ||
| ds000221 | func | task-rest_acq-PA | Siemens | 14 | 7.07% | 198 | TE | 184 | 92.92 % |
| ds002345 | func | task-milkway | Siemens | 17 | 32.07%a | 53 | TR | 36 | 67.92 % |
| ds000228 | func | task-pixar | Siemens | 3 | 1.93% | 155 | FA | 152 | 98.06 % |
| ds000258 | func | task-rest | Siemens | 4 | 4.49%a | 85 | TR | 85 | 95.5% |
| ds002785 | dwi | Philips | 33 | 15.63%a | 211 | TR | 178 | 84.36% | |
| ds004169 | anat | t1w | 27 | 2.24% | 1202 | FA, PES, PB, TR | 1175 | 97.75% | |
| func | task-nback | 3 | 0.25% | 1189 | FA, PED | 1186 | 99.74% | ||
| func | task-rest | Siemens | 2 | 0.19% | 1029 | FA, PED | 1027 | 99.8% | |
aThere are minor differences in parameter values. See dicussion
bFor BIDS datasets, entities correspond to an altered acquisition parameter