we ran into a problem using ReHo maps produced by Data Processing Assistant for Resting-State fMRI (DPARSF). When feeding the ReHo maps into a SPM 2nd level model, the "mask.img" file produced by SPM becomes inflated, resulting in clusters outside of the head.
I checked the ReHo maps and the data used to produce the maps and they all fit the SPM EPI-template well. Do you have any idea, why the inflated mask file is generated? I also tried using fALFF maps, which worked perfectly fine.
Any help would be appreciated.