From 1789dccb9e04ee8952a7d562824dc6e92418ce7c Mon Sep 17 00:00:00 2001 From: Yaroslav Halchenko Date: Wed, 24 Apr 2024 12:48:39 -0400 Subject: [PATCH 1/2] Fix syntax (add closing ')') + point to specific issue for multi-site --- src/longitudinal-and-multi-site-studies.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/longitudinal-and-multi-site-studies.md b/src/longitudinal-and-multi-site-studies.md index bf9cb92eec..fba823e1f6 100644 --- a/src/longitudinal-and-multi-site-studies.md +++ b/src/longitudinal-and-multi-site-studies.md @@ -80,7 +80,7 @@ for practical guidance when curating a new longitudinal dataset. This version of the BIDS specification does not explicitly cover studies with data coming from multiple sites or multiple centers (such extension is planned -in [BIDS `2.0`](https://github.com/bids-standard/bids-2-devel). +in [BIDS `2.0`](https://github.com/bids-standard/bids-2-devel/issues/11)). There are however ways to model your data without any loss in terms of metadata. ### Option 1: Treat each site/center as a separate dataset From d92329d90bf375ff6341684c2e0ba53d9a68ae43 Mon Sep 17 00:00:00 2001 From: Yaroslav Halchenko Date: Wed, 24 Apr 2024 13:28:33 -0400 Subject: [PATCH 2/2] Add additional way (session-level) for multi-site studies Reflecting up on discussion within https://github.com/bids-standard/bids-2-devel/issues/11 --- src/longitudinal-and-multi-site-studies.md | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/src/longitudinal-and-multi-site-studies.md b/src/longitudinal-and-multi-site-studies.md index fba823e1f6..b64ae016e8 100644 --- a/src/longitudinal-and-multi-site-studies.md +++ b/src/longitudinal-and-multi-site-studies.md @@ -92,11 +92,21 @@ Apps and everything should just work. ### Option 2: Combining sites/centers into one dataset -Alternatively you can combine data from all sites into one dataset. To identify -which site each subjects comes from you can add a `site` column in the +Alternatively you can combine data from all sites into one dataset. +This can be done in two ways: + + +#### Option 2.a: Collate sites at subject level + +To identify which site each subjects comes from you can add a `site` column in the `participants.tsv` file indicating the source site. This solution allows you to -analyze all of the subjects together in one dataset. One caveat is that subjects +analyze all subjects together in one dataset. One caveat is that subjects from all sites will have to have unique labels. To enforce that and improve readability you can use a subject label prefix identifying the site. For example `sub-NUY001`, `sub-MIT002`, `sub-MPG002` and so on. Remember that hyphens and underscores are not allowed in subject labels. + +#### Option 2.b: Use different sessions for different sites + +In case of studies such as "Traveling Human Phantom" it is possible to incorporate site within session label. +For example `sub-human1/ses-NUY`, `sub-human1/ses-MIT`, `sub-phantom1/ses-NUY`, `sub-phantom1/ses-MIT` and so on.