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Hi - I would suggest that you analyse the data using dtifit! Saad On 2 Jan 2013, at 17:37, Sinead Kelly wrote: > Hi Saad, > > I used ExploreDTI to preprocess my data and also used this software to > convert the DTI *.mat files to the RD,MD and AD *.nii files. > > I have 15 direction data with a b-value of 800 but I haven't looked at > the bvals for this subject - do you know how I could check this? > Should I look at the b-matrix? Do you know what the normal intensity > ranges for non_FA data should be? I could exclude this subject from > analysis. However, the intensity ranges for my FA data is normal for > all of my subjects (0:1). > > Thank you for your help! > > Sinead > > On 2 January 2013 16:39, Saad Jbabdi <[log in to unmask]> wrote: >> Hi - this looks strange. >> - Did you run dtifit to get the RD values? Or is it from a different software? >> - Did you check that the bvals are correct for that subject? >> >> Cheers >> Saad >> >> >> On 2 Jan 2013, at 16:21, Sinead Kelly wrote: >> >>> Hi all, >>> >>> I'm running TBSS analysis on non-FA data: namely, AD, MD and RD values. As you know, the minimum and maximum intensity values need to be checked before running the 'tbss_preproc' script by entering the command 'fslstats ____.nii.gz -R'. >>> >>> However, I'm getting strange intensity values for some subjects... For example, one subject happens to have >>> an RD intensity range of 0 - 4803.45. This doesn't seem normal - I would expect this (based on my Explore-DTI tractography results) to be more in the range of 0 - 0.0005. >>> >>> Just wondering if anyone could shed light on this: am I correct to assume that my range should be in decimals, not thousands? My FA data, however, is in the normal intensity range of 0:1. >>> >>> Many thanks, >>> >>> Sinéad >>> >> >> -- >> Saad Jbabdi >> University of Oxford, FMRIB Centre >> >> JR Hospital, Headington, OX3 9DU, UK >> (+44)1865-222466 (fax 717) >> www.fmrib.ox.ac.uk/~saad >> > > > > -- > Sinead Kelly > Neuropsychiatric Genetics Group > Trinity Centre > St. James's Hospital > Dublin 8 > -- Saad Jbabdi University of Oxford, FMRIB Centre JR Hospital, Headington, OX3 9DU, UK (+44)1865-222466 (fax 717) www.fmrib.ox.ac.uk/~saad