Assigning a pairing fieldmap with fMRI runs

[Aaron Tanenbaum]

Hello,

I would like some advice.  When we collect fMRI, sometimes our participants leave in the middle of a scan usually for the restroom. When they come back, we would have to recollect field maps.  How best should I represent in BIDS which field maps runs goes with which fMRI runs.

Thank you

Aaron

[Dr Cyril, Pernet]

Hi Aaron

under FieldMap https://bids-specification.readthedocs.io/en/stable/modality-specific-files/magnetic-resonance-imaging-data.html#fieldmap-data you will find the metadata entity 'IntendedFor' (https://bids-specification.readthedocs.io/en/stable/glossary.html#objects.metadata.IntendedFor) this allows you to specify to which runs you want to associate the field maps

hope this helps

cyril

PS: it says deprecated, so I imagine there is an alternative solution to do that? maybe in the scan file (https://bids-specification.readthedocs.io/en/stable/modality-agnostic-files.html#scans-file) optional columns (this would work too)

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[Marcel Zwiers]

Like Cyril said, you can use `IntendedFor` (pointing to your scans that you like to be corrected), or you can use the newer `B0FieldIdentifier` (-> a tag to group the scans required to compute your fieldmap) + `B0FieldSource (the tag of the fieldmap that you like to use for correction).

See e.g.:

https://bids-specification.readthedocs.io/en/stable/modality-specific-files/magnetic-resonance-imaging-data.html#using-b0fieldidentifier-metadata

https://neurostars.org/t/how-to-set-b0fieldidentifier-and-b0fieldsource/27040

Op woensdag 8 mei 2024 om 09:59:54 UTC+2 schreef wamc...@gmail.com: