Number of unique participants for each modality in BIDS dataset?

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Hi all,

Is there any BIDS app or script that summarizes a dataset by parsing all the modalities and counting how many unique participants are available for each modality (e.g., anat: t1w/t2w, func: task-restingstate/task-motor, dwi: acq-singleshelldir42, etc.)? Basically, we need a head count for every type of scan in the dataset.

Thank you.
Dorian

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For reference: the conversation was started here but it felt more appropriate to have it on Neurostars.

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You mentioned the possibility of doing this in R. It’d be really good to have also some R tools for this.

The R ecosystem for BIDS is not necessarily under-developped (though it might be I don’t have good visibility on this) but there is at least one R package to help interacting with BIDS (mostly MRI I think).

So if you were thinking of developing some R tools for this, it might be good to maybe add them to this repo.

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Pinging @bbuchsbaum , in case he has a solution to my question with bidser.

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“bidser” has the function “search_files”

so, for example:

bp ← bids_project(“myproject”)

t1w ← search_files(bp, kind=“t1w”, suffix=“nii.gz”)
length(t1w)
task_motor ← search_files(bp, task=“motor”, kind=“bold”, suffix=“nii.gz”)
length(task_motor)

in other words, if you know the scan types you want to count, you could search for them like above.

would this work for you? “bidser” is a work in progress, but should be up to this task.

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