Hi,
On 20 Jan 2011, at 18:48, Roger Jou wrote:
> Hi all,
>
> I understand this issue has been discussed before, but it wasn't entirely clear me whether there was a consensus on how to address negative eigenvalues in the calculation of FA, axial diffusivity, and radial diffusivity maps. Looking through the archives, it appears that negative eigenvalues should not be "corrected" for the purpose of running TBSS comparing FA. Is this also the case for axial diffusivity and radial diffusivity?
>
Yes. There is nothing wrong that needs to be corrected, these are just estimates of the true values.
> Many thanks,
>
> Roger
>
Cheers,
Stam
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