Hi there,

Long time:). Well I wrote to the list several times regarding high FA values I got when performing DTI analysis.
Today we know that the problem was an additional direction (we had 17 directions instead of 16 - we used a Philips scanner,1.5T). So we deleted the additional slices and the high values indeed disappeared, but then another problem came up (tried several subjects so the problem is not specific to a subject) -

I noticed an artifact that I can't explain - please see the attached pictures.

This artifact existed even before I deleted the additional slices, also - I see the artifact also when loading the masked volume...It is cyclic - run over all slices...

any ideas ?

 

I'm using version 5.2 and I know the command lines are correct (send it to u in the past).

Thanks for your help

Rotem