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Hi all, When I used possum to get fMRI data set, I choose the tab Activation and used T2* time course and T2* spatial modulation. But at last, the result file - image_abs.nii.gz was just 3D volume. I think it should be the fMRI data set. But fMRI data should be 4D and the fourth dimenson should be the time. why was that? Thanks for any reply. Zheng -- Dr. Zheng Liu Postdoctoral student in Computer Vision and Image Analysis Lab Department of Electrical and Computer Engineering Texas Tech University, Lubbock, TX 79409