The Radiology Assistant: http://www.radiologyassistant.nl/ is an awesome website for learning about neuroimaging in dementia. I recommend this page which explains the Fazekas, Global Cerebral Atrophy and MTA/Scheltens scoring systems for cerebrovascular disease and atrophy. It won’t make you a neuroradiologist but it might help you make sensible requests and sensible contributions to discussion.