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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