[Mristudio-users] Flip eigen vector

[susumu mori]

Hi Miguel,

It seems your Y-flip is right, although it's very rare that you have to flip
Y. Usually X (Siemens) or Z (Philips).
Please also do try genu, body, and splenium of the corpus callosum at the
mid-sagittal level. I think it'll work but just to make sure.

Also, if you are using Siemens (before VB15) or Philips (if you are using
Gradient Overplus), make sure that you are taking care the oblique angles
right.

Susumu

On Fri, Dec 11, 2009 at 1:48 PM, Miguel Burgaleta
<miguel.burgaleta at uam.es>wrote:

>
> Dear DTIStudio experts,
>
> My question has to do with the flipping of the eigenvectors in fiber
> tracking. It looks like this is something very tricky, so I would like to
> make sure that I am choosing the right one.
>
> So I ran the fiber tracking ( starting and ending FA thresholds at .2 and
> angle at 40) and tried a single 'OR' ROI in the brainstem, capturing the
> corticospinal tract. I used this single ROI to track fibers in 4 conditions:
> no flipping of eigenvectors, flipping of X, flipping of Y and flipping of Z.
>
> Please see results in attachment (note that the acquisition is not a full
> brain coverage). I'm not very good at anatomy but would say that flipping
> the Y eigenvector leads to the best results - better than no flipping...
> What do you think?
>
> Thanks in advance for your time.
>
> Miguel
>
>
>
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