Dear Antonella,

In theory, FA can be sqrt(3/2) = 1.2247449. This occurs if
eigenvalues 2 and 3 are zero. You will find these high
FA values (>1) mainly outside the brain.

Ed

On 3 Feb 2012, at 11:31, freesurfer-request@nmr.mgh.harvard.edu wrote:


Dear all,


I use dt_recon to process my DTI data and get my fa.nii for the individual subjects. I wonder if the FA values can be greater that one since for all my subjects I got the FA max? value graeter than one. Is something wrong with my data or this is acceptable? I saw in? most of the papers FA<1 so 0<FA<1.


Thank you.

Antonella