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Hi everyone, I have a rather simple question I would like to get help with. I have a spherical ROI in nii format. First, I get the coordinates for all the voxels within the ROI: Y = spm_read_vols(spm_vol(roi),1); indx = find(Y>0); [x,y,z] = ind2sub(size(Y),indx); roi_coord=[x y z]'; Let's say here the roi_coord ends up being 3x20 double, meaning there are 20 voxels I then use spm_get_data to get the intensity value for each voxel at each time point. After that I identify outlier voxels based on some arbitrary criteria and remove these voxels from the roi_coord. The new set of coordinates new_roi_coord is 3x15 double (assuming that 5 voxels have been removed). Could anyone tell me how to transform this set of coordinates back into a mask/ROI? Many thanks! Thang Le