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
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