I can only talk about this in generalities since I don't know the case and haven't the information available to all the specialists treating your husband.
Stokes cause brain tissue death due to lack of oxygen to areas of the brain depending on what vessels were occluded (blocked off). Personality changes are a common side effect. However, the personality changes aren't necessarily equivalent to the size/depth of the dead area. It isn't that simple. In some cases a death of tissue 0.1 mm in diameter can cause more personality change that one 10 mm in diameter.
I'm afraid that seeing the images won't give you much useful information since it takes years of specialized training to decipher the meanings. All you can go on is the information provided by the specialists who read the images and those who are treating him. I would suggest you contact the social worker at the hospital (if he is still there) and set up a meeting to discuss his current condition, prognosis, etc. This can even be done after he is discharged. Some hospitals have ombudsmen to intervene when patients and their families aren't being given sufficient information, or the information is presented in such a way that they can't understand it.
There is also the possibility that they cannot say how bad the damage was, and what the outcome will be. We understand a lot more about brain tissue death in the areas that control physical motion, than in the areas that control personality, etc. Rehabilitation after stroke can take 6-12 months before a true prognosis is known.
I would try to arrange a meeting with the physicians before embarking on a request for medical records and scans, most of which would be in language that the normal person doesn't understand any way. In a face-to-face meeting, you can actually ask them questions, and ask again and again until they put it in language that makes sense to you.