Dear SPM/PET community Sorry for this PET-beginners question: I first converted .dcm PET images to Analyze format (-> 27 frames) via dcm2nii I next tried to apply realignment in SPM (on all frames). However, I received the following error message -> PET_error.jpg Is there something wrong with the header of the images (attached) or in the way processing the data? Thanks for your help Lars [cid:ECEEA7E0945AC2409A1DB9A4474A76F5@usz.ch] [cid:AA0132A75A664D4A86762C8332B50BAC@usz.ch] .............................................. Dr. phil. L. Michels, Oberassistent Institute of Neuroradiology University Hospital of Zurich Frauenklinikstrasse 10 CH 8091, Switzerland FON +41-44-255-4965 Fax +41-44-255-8946