It has been a very long time since we looked at that program, but we're happy to help. The model we used was a 2-compartment, 3 parameter model. The Expr2 model option is probably too simple for that. The use of that model required some preprocessing to transform the data given optional relaxivity maps from dual flip angles, an input vascular time series (estimated from a sagittal sinus vein signal), the subject hematocrit level and some other vaguely remembered things right now. I can probably dig up the scripts and the presentations on this. The published paper was this one:

[pubmed.ncbi.nlm.nih.gov]

[afni.nimh.nih.gov]

In any case, it will probably be too complicated to discuss in a message board post, so email either Rick or me to set up an online meeting to discuss.