@ohiogal8860 Speaking only from my personal experience (I have small cell lung cancer), I first had a round of whole-brain radiation and then an MRI two months latter. That revealed one very small lesion that the first round had not taken care of. The doctors then delivered a high, precisely targeted dose to that lesion. Two months later, I had another MRI that showed the targeted dose had taken care of the lesion, but another lesion had developed in a different area. I went back for another high, precisely targeted dose and am awaiting my next MRI to see where things stand. My radiation oncologist says the effects of radiation continue working for about two months after treatment so they do the next MRI after two months. Again, in my experience, I only get a repeat MRI if new cancer shows up that must be treated. Then after the treatment, I'll get another MRI two months later to verify the effectiveness of the treatment. I wouldn't think your husband would get more radiation unless more cancer shows up on the MRI. Because of the potential side effects, in my experience they are very careful about using radiation on the brain.