I am curating a large collection of clinical data. Some of the images fall outside the current BIDS specification and I was hoping for some human advice to supplement my searches the the specification and the various BEPs.
Clinical diffusion-weighted images
Our studies often include a simple diffusion scan producing ADC, FA and TRACEW maps. Sometimes the original diffusion images aren’t even kept. These would be used as anatomical images, practically, for things like outlining ischaemic lesions. How should they be labelled. I was thinking:
I realize technically these are derivatives, but since they are produced at the scanner, we can’t describe a pipeline. In many cases there will be no raw image to point back to. So I think it’s best to treat them as raw data. It may be unnecessary, but it may help to use a filename entity to group ADC, FA etc from the same scan (it’s not always clear which are related, but sometimes the Series Number hint at this, e.g. 401, 402, 403 all derived from DWI in series 4, which is not kept).
I can’t see anything about CT in the BIDS specification. We’ll use these again for anatomy, so I’m thinking for my purposes I can get away with: