What is the core task of MedReason?
MedReason is a medical visual question answering challenge. Participants answer both multiple-choice and open-ended questions from medical images and optional high-level context.
What does “unseen data” mean in this challenge?
It refers specifically to the out-of-distribution conditions introduced by the challenge: low-dose X-ray and ultra-high-field 7T brain MRI.
Do I need to train a medical MLLM from scratch?
No. You submit a Dockerized runnable system. Publicly available datasets and open-source pre-trained models are allowed.
How is MedReason related to Med-CMR?
MedReason builds on Med-CMR as its benchmark backbone and extends it into a challenge with explicit domain shift.
How are open-ended answers evaluated?
Open-ended answers are evaluated for both ground-truth correctness and visual grounding quality, not only for fluency or coherence.