BIDS-ASL request for comments - closes on Friday (Nov 13th)

The BIDS community is preparing to merge the ASL (Arterial Spin Labeling) extension. The updated draft is available for review at:, and comments and suggestions may be submitted on GitHub at: The community review will close on Friday (Nov 13th) at 11:59pm PT (pacific time)

This BIDS extension seeks to establish how ASL data and additional metadata are organized within the BIDS structure. This encompasses the ASL sequences provided in the consensus paper [Alsop 2014], including single- and multi-time point pulsed and (pseudo)-continuous ASL.

The final review entails a two week period for public commenting, with a possibility of extension for unresolved discussion. Once public comments are concluded, there will be a one week freeze, during which only critical issues will be considered. (For more details on the release protocol, see

We look forward to hearing your feedback!
The BIDS Team