Can you provide a citation for the France assertion? I think it’s wildly unlikely a protocol for acute stroke would favor mri over ct but could be wrong. It would take 20 minutes to transfer a pt to mri in a lot of stroke centers in the USA, as opposed to CT’s that are generally across the hall, where imaging should be read within 30 minutes of door time I believe.
Also I’m not sure what you increased “sensitivity” would get you. Acute stroke is a clinical diagnosis, the imaging determines the type of stroke and treatment.