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Dear Philip, If your preprocessed images are in MNI space (ie the space of the atlas), then you can use the "reslice only" option of Coregister to reslice your images to match the atlas. It might not be necessary though: the spm_atlas.m function will give you labels from a set of regions without having to do any explicit reslicing, and it should be compatible with the AAL atlas. Having a brief look at the link you sent, it seems that the preprocessed data are not in a standard space (eg MNI) so you would have to estimate this transformation first (using Segment/Normalise). Best regards, Guillaume. On 05/04/17 08:12, Philip Lin wrote: > Dear SPM experts: > > I've downloaded about 700 preprocessed FDG-PET images from ADNI (http://adni.loni.usc.edu/). (The first 3 preprocess procedure has been done as listed in http://adni.loni.usc.edu/methods/pet-analysis/pre-processing/). > > 1. These preprocessed images has the dimension 160x160x96. (named as I001.img to I700.img) > 2. We have interested in finding name of each subregion with respect to standard atlas (e.g. AAL, http://www.gin.cnrs.fr/spip-php-article217). For AAL, downloaded from the website, has the dimension 91x109x91. > > Apparently, to match voxels in 1. and 2., I need to transform both of them into the same coordinate system. Is there any way to do this ? > > Thanks > > Philip Lin > -- Guillaume Flandin, PhD Wellcome Trust Centre for Neuroimaging University College London 12 Queen Square London WC1N 3BG