Looks interesting for those thinking of getting involved in this. Though sensors seem to be an issue that won"t be solved cheaply or easily, it at least looks like software is on its way.
Looking through the packages, and wow, really cool. There are definitely packages in there which would be useful:
This software for processing medical images might be useful if you do include some kind of scanner. Not sure if the pi is going to have the processing power to run all the needed software (especially not simultaneously) for a quick result. Maybe a Pi with sensor board connected wirelessly to a cluster (bramble).