This example is intended to exercise BOLD volume timing options enumerated in https://bids-specification.readthedocs.io/en/stable/modality-specific-files/magnetic-resonance-imaging-data.html#timing-parameters_1.
All JSON files describe 1-second volume acquisitions, in various configurations.
| Filename | Acquisition type | Metadata fields | Description |
|---|---|---|---|
sub-01_task-rest_acq-dense_bold.json |
Dense | RepetitionTime |
No gaps in volume acquisitions. |
sub-01_task-rest_acq-constantDelay_bold.json |
Constant-TR sparse | RepetitionTime, DelayTime |
Constant TR with a gap between volume acquisitions. |
sub-01_task-rest_acq-constantST_bold.json |
Constant-TR sparse | RepetitionTime, SliceTiming |
Constant TR, with acquisition duration calculable from SliceTiming. |
sub-01_task-rest_acq-clusteredTA_bold.json |
Varying-TR sparse | VolumeTiming, FrameAcquisitionDuration |
Volume onsets and constant acquisition duration provided. |
sub-01_task-rest_acq-clusteredST_bold.json |
Varying-TR sparse | VolumeTiming, SliceTiming |
Volume onsets provided, with acquisition duration calculable from SliceTiming. |
sub-01_task-rest_acq-deprecated_bold.json |
Varying-TR sparse | VolumeTiming, AcquisitionDuration |
Volume onsets and constant acquisition duration provided. |
Note the acq-deprecated option, which uses the AcquisitionDuration field.
This field was identified with a DICOM field that has a distinct meaning from the meaning
used in BIDS, which more closely aligns with FrameAcquisitionDuration.
This form is still permitted by the validator, but should be migrated away from.