Unfortunately detecting and quantifying cerebral infractions from MRI a complex topic and I can’t describe a step by step solution here. A lot depends on the quality and the type of the MRI in terms of how well different tissues are imaged. I know you have already been trying to look for a solution, but probably best would be to study the underlying publications around hemorrhagic stroke imaging so you have a better idea what can and cannot be reliably imaged. It’s an active research topic so I’m sure you will find many useful papers on the topic.
For reference here’s the other post.