[Mristudio-users] Is there an exact correlation between FA value and total tract fibers ?

[susumu mori]

It can happen when white matter becomes smaller while FA doesn't
change a lot. This would be the most natural interpretation.
Also, tractography could be relatively insensitive to decreased FA
because tractography tends to extract only the core of the tract with
high FA.

Also, if there is one area along the tract where a portion of the
tract has lower FA, tractography stops when it hits the low FA area
due to the FA threshold. This also would lead to smaller tractography
with unchanged FA.

So, there are several possibilities.

On Fri, May 11, 2012 at 1:27 PM, Fatemeh Derakhshan
<fatemeh.derakhshan at gmail.com> wrote:
>
> Hi all,
> I'm working on DTI images of mice; recently I found out that in some of my
> transgenic mouse brains the total tract fibers were lower than normal in
> corpus callosum,while FA values are within the normal ranges. We use
> ROI approach to detect tract fiber numbers. Does it at all make sense?
> Thanks
>
> --
> Fatemeh Derakhshan
>
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