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Dear Experts, I am doing region of interest analysis by using wfu-pickatlas. I have defined a region using aal atlas and created mask. The voxel dimension of the mask is 2x2x2. The sMRI voxel dimension is 1x1x1. And the voxel dimension of SPMT map is 1.5x1.5x1.5. I have few questions regarding this. 1. Since there is difference in the voxel dimension, the mask has to be co-registered. With which image should I co-registered, with sMRI or with SPMT map? My understanding is that since result is displayed using SPM T map, the mask image has to be co-registered with SPM T map. Am I correct? 2. I have to perform ROI analysis for 8 regions. Should I create mask for all 8 regions or can I make mask separately? 3. How to calculate the voxel volume of a particulate coordinate? Thanks in advance RB