I am curious about something on an MRI scan from 4 years ago. I continue to have some difficulty reading after a motorcycle mishap (hit a school bus without my helmet). I was told a couple of months after that I had a small infarction of a small vessel in my brain. Lately I decided to start looking into my situation and I was looking at the entire disk of scans taken back then and this came up. What is being measured here? Anyone understand this?

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