Do you really mean "real-world average brain"? If you actually mean real-world individual brain, then you can use the y_*.nii (which can be generated via the new segmentation) to map from points in MNI space to points in the original scan. Alternatively, you may wish to warp your results back to an individual, in which case you can use the Deformations utility of SPM8. Either get the new segmentation to generate a iy_*.nii file, or get the deformations utility to invert the y_*.nii. If I remember correctly, the "Using Dartel" section of the manual should contain some hints on this. Best regards, -John On Wed, 2010-01-27 at 14:56 +0000, João Duarte wrote: > Dear SPMers, > > I use SPM8 to do Segmentation (which includes normalization to MNI > space) and Smoothing of anatomical MR images. > Now, how can I know where in the real-world average brain is voxel > number 39524 for example? I mean, how can I know to which structure > corresponds each one of the images' voxels? > > Thank you, regards > > João -- John Ashburner <[log in to unmask]>