[Mristudio-users] FA stats question

[susumu mori]

Hi Matt,

The slice profile gives the average FA of the pixels within one given slice.
In your example, there should be only one pixel at each slice and thus you
get the FA of that single pixel.
If you want the average of the entire fiber, you need the reported FA before
you click "profile".

Also, if you want tracts between two ROIs, you may also want to try the
"CUT" operation, which waits for two ROI inputs and retain only the
trajectories between the two ROIs.

Susumu

On Mon, Aug 22, 2011 at 12:52 PM, Matthew Gnirke <gnirkem at upstate.edu>wrote:

> Hi
>
> I have a question regarding the statistics profile in DTI-studio. I am
> attempting to only measure the fibers between two extreme OR ROIs with an
> AND ROI in between them. If I click statistics and then select the FA map,
> and click stats profile, the program gives a breakdown of fibers by slice.
> My question is what exactly is the mean FA value reflecting.. is it computed
> from the FA of the fibers at that specific slice, or is it computed from the
> average of the FA of the whole length of the fiber.  Lets say for example
> (for simplicity), there is only one fiber... is each slices FA reflective of
> the FA at that slice or of the average of that fiber along its entire
> course?
>
> Thank you for your help, and I hope my question made a little sense..
> Matt
>
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