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Dear SPMers, I'm using SPM99 for PET analyses. My raw PET scans are VERY different from each other in terms of their translations and rotations. I've used the DISPLAY option in SPM to manually translate and rotate each image so that their origins fit in the AC/PC plane. I've also used the Check Reg option to verify that each image matches each other adequately. However, when realigning the images the translations are huge (20-30 mm) because their individual origin locations (ex. [128 128 11] and [140 160 8]) differ largely. I can't seem to get around this and I know that one should not proceed further if translations exceed ~5mm. Any suggestions? Nathan White ===== Nathan S. White [log in to unmask] __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/