I'm conducting a longitudinal study of picture-naming in which neurologically intact volunteers are asked to be scanned four times, once every four weeks. I have already completed the first scan for each subject, some of whom are also participating in a joint MEG study utilizing the same paradigm. For those also doing MEG, I acquired an MP-RAGE for the structural scan. However for those not doing MEG, I acquired a 3D FSPGR.
My question is as follows: For the subsequent scans of the subjects for whom I acquired a 3D FSPGR, can I switch to an MP-RAGE? Or will I have trouble comparing the second, third and fourth scans with the first one if I switch now?
Thank you,
Whitney
