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Thanks Saad, So it means an upper-triangular representation. However, I want to use the data with another software, interpreting nifti tensor matrices according to the NIFTI_INTENT codes. E.g. a diffusion tensor by "NIFTI_INTENT_SYMMATRIX". As far as I can see, FSL writes the elements along dim4 and not according to the NIFTI_INTENT codes (which has tensor elements in dim5). Is there any good way of going between FSL format and the NIFTI matrix formats? Regards, Finn On Mon, Jun 15, 2009 at 4:22 PM, Saad Jbabdi<[log in to unmask]> wrote: > Hi > It is Dxx Dxy Dxz Dyy Dyz Dzz. > > Cheers, > Saad. > > > On 15 Jun 2009, at 07:18, Finn Lennartsson wrote: > >> Hi, >> >> What is the order of the tensor elements (Dxx, Dxy, Dyy, Dxz, Dyz, >> Dzz) in dim4 when using option --save_tensor in dtifit? >> >> Cheers, >> Finn >> -- >> > > -- > Saad Jbabdi > Oxford University FMRIB Centre > > JR Hospital, Headington, OX3 9DU, UK > +44 (0) 1865 222545 (fax 717) > www.fmrib.ox.ac.uk/~saad > -- _______________________________ Finn Lennartsson Rödabergsbrinken 8 SE-113 30 Stockholm, Sweden Cell: + 46 704 838907 E-mail: [log in to unmask]