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Dear Jerome I think if you reslice the images (probably you will have to do all the images flipped and unflipped) in their current orientation this will get rid of the differences in the transformation matrices. Try Ged Ridgway's script: resize_img.m http://www.cs.ucl.ac.uk/staff/G.Ridgway/vbm/resize_img.m Darren > -----Original Message----- > From: SPM (Statistical Parametric Mapping) > [mailto:[log in to unmask]] On Behalf Of Jérôme Redouté > Sent: Wednesday, April 30, 2008 3:55 AM > To: [log in to unmask] > Subject: [SPM] flipped images > > Dear SPMers, > we want to perform an fMRI analysis comparing images from one > run to the flipped images from another run. > We tried to flip smoothed images (nifti) but SPM5 seems to > reject analyses using images with different orientations. > How can we fix that? > Thanks for your help > Jerome > > -- > =============================================================== > Jérôme Redouté > CERMEP - Imagerie du vivant > Centre d'étude et de recherche multimodal et pluridisciplinaire > 59 Bd Pinel > 69667 Bron - FRANCE > tel : 33 (0)4 72 68 86 13 (bureau) > tel : 33 (0)4 72 68 86 00 (standard) > fax : 33 (0)4 72 68 86 10 > =============================================================== >