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On Tue, 8 Nov 2005, LeiNa Hua wrote: > Hi SPMers.hi,Volkmar: > I was trying to use SPM2's routine to read and write fMRI data and > encountered a problem: > First I constructed a filename matrix,for example I want to read the first > two volumes of my fMRI data: > files = ['f2005090402-0004-00001-000001.img';' > f2005090402-0004-00002-000002.img']; > Then used the spm_vol to get structure info of images (V) > V= spm_vol(files); > Then,I used the spm_read_vols to read the data,but some error were > reported: > >> data = spm_read_vols(V);; > ??? Error using ==> spm_read_vols > images don't all have same orientation & voxel size > what is wrong with my operation ? Well, what is this error telling you? That orientations and perhaps voxel sizes are different for your images. I guess, you did a realignment but no reslice on your data. Therefore, spm_read_vols rightfully refuses to read the images into a 4D-Matrix. You can either - not do any realignment before reading the data - do realign&reslice and work on resliced images - use spm_slice_vol/spm_sample_vol to read your images. > Can someone show me how to use these routines in right way to read and write > fMRI( a series of 3D data )? > Thanks in advance. > Leina > -- Volkmar Glauche - Department of Neurology [log in to unmask] Universitaetsklinikum Freiburg Phone 49(0)761-270-5331 Breisacher Str. 64 Fax 49(0)761-270-5416 79106 Freiburg