GC Participation:

Accounts

A single account per participant.  You can not submit from multiple grand-challenge accounts. Each participant is allowed to solely submit from a single account.

Code-sharing

Participants are only allowed to share scripts among their team members. Code sharing with other participants should be made publicly available through our forum.

Teams

Teams are allowed. Participants in a team are not allowed to make individual submissions outside of their team, as this unfairly increases the submission chances. Each participant can only join one team.

Exclusion policy

We reserve the right to exclude from ISLES'26 challenge those participants/teams breaking any of these rules.

ISLES'26 MICCAI CHALLENGE:

In order to be considered in the ISLES'26 MICCAI LEADERBOARD and in order to be invited as a co-author for the final  challenge results manuscript, participants MUST comply with the following requirements (in addition to the above-mentioned GC rules):

1) Submission of a working method to the final TEST phase of the challenge.

2) Submission of an abstract. It should describe the solution that you have adopted to solve the task. NO IMAGES NOR FIGURES; NO DESCRIPTION OF THE DATASET; NO INTRODUCTION ABOUT STROKE, PROBLE, ETC. JUST FOCUS ON YOUR ALGORITHM. 300 words maximum. Please ensure that your abstract is grammatically correct and in good overall English, as it will be used for the final manuscript.

3) Summary table filled-in (please download and upload as .xlsx). 

3) Registration proof to the workshop day in MICCAI'26 (for one team member).

4) Open GitHub repository for the submitted algorithm with a permissive open-source license (e.g. Apache 2.0). 

5) You must FILL IN THIS FORM  BY AUGUST the 30th, 2026. It has a place to upload your abstract, .xlsx table, and proof of workshop registration as a zipped file (please name your file with the GC username/team-name from which the algorithm submission was done). 

Participants that do not comply with the ISLES'26 rules will be excluded from the MICCAI leaderboard and from the challenge manuscript. 

RANKING

  • The ISLES'26 ranking will be announced at MICCAI'26, during the SWITCH workshop (Sept 27th).
  • The ranking is performed at a case-level, as described in our challenge proposal. It is the same ranking scheme used in previous ISLES editions. You can check a detailed explanation of the ranking scheme here.

After MICCAI'26, the grand-challenge leaderboard will be published and the challenge will be closed. However, this ranking might differ from our ISLES-MICCAI challenge ranking, as it is computed in a different way (in grand-challenge, the ranking is calculated using the 'mean' value of each metric, which is different to our ISLES ranking that works at a case-level). For the MICCAI challenge and for the manuscript,  the ISLES24-MICCAI ranking  is only considered.