I just found that the laterality of the ROI masks created with Marina is not correct as viewd by SPM8, but it is correct when viewed by MRIcroN. Strangely, this problem only happens on Marina's masks but not on other images like T1 with known laterality (a fish cod pill was sticked to subject's left forehead).
Attached please find 2 pictures which showed the above mentioned problem.
I also tried other ROI masks created with another software like wfu_pickatlas. Both SPM8 and MRIcroN read their left-right okay.
If I want to use the Marina's mask, how may I make the laterality of the masks to be correctly viewed in SPM8 (note: I use REX toolbox on SPM8 to extract mean value within a ROI)? Thanks for any comments/help!