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Dear SPM list, I have some DICOM images to convert. I have used several packages, but I was wondering how the spm_DICOM m-file is doing this. More specifically, I am looking how to relate the output of the SPM native conversion (header and matlab file) to the differences in origin between the formats. From the matlab file I gather that the spm functions flip the DICOM correctly along the Y-axis, and that after normalisation in T&T space the images are flipped again along the X-axis. Is this correct? Additionally, the matlab file that is output by the SPM conversion, does it contain information regarding this transformation? And finally, is the origin determined from the DICOM header and where can one find this information. I have been looking at different sites and manuals but by now I am completely lost in the differences between image formats. Any help would be greatly appreciated. Moreover, the information about the SPM conversion is very hard to find (for instance, the WIKI refers to SPM_TBR, which in spm2 is obsolete I guess). Kind regards Bernie Caessens,Ph.D. Dept. of Exp. Psychology & Ghent Institute for functional Magnetic Resonance Imaging (GIfMI) Ghent University - Belgium