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[FIX] Clarify run indexing information for MRI acquisitions #694

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[FIX] Clarify run indexing information for MRI acquisitions #694

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Update 01-magnetic-resonance-imaging-data.md
dlevitas Dec 8, 2020
66cd01c
Update src/04-modality-specific-files/01-magnetic-resonance-imaging-d…
dlevitas Dec 11, 2020
5b7e339
Update 01-magnetic-resonance-imaging-data.md
dlevitas Dec 17, 2020
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6 changes: 5 additions & 1 deletion src/04-modality-specific-files/01-magnetic-resonance-imaging-data.md
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Expand Up @@ -168,7 +168,11 @@ For example, `sub-01_mod-T1w_defacemask.nii.gz`.
If several scans of the same modality are acquired they MUST be indexed with the
[`run-<index>`](../99-appendices/09-entities.md#run) key-value pair:
`_run-1`, `_run-2`, `_run-3`, and so on (only nonnegative integers are allowed as
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If several scans of the same modality are acquired they MUST be indexed with the
[`run-<index>`](../99-appendices/09-entities.md#run) key-value pair:
`_run-1`, `_run-2`, `_run-3`, and so on (only nonnegative integers are allowed as

run labels). When there is only one scan of a given type the run key MAY be
run labels).
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run labels).

If however these scans of the same modality contain different labels
(for example `_acq-`, `_ce-`, `_desc-`) then the run label and indexing are optional,
unless the labels are the same.
When there is only one scan of a given type the run key MAY be
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omitted. Please note that diffusion imaging data is stored elsewhere (see
below).

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