[Mristudio-users] Fiber-Tracking Menu Options

[susumu mori]

Hi Nelles,

I believe they are the same (Hangyi, correct me if I'm wrong). Usually after
tensor calculation, we save tensor-derived images such as FA, eigenvalues,
and eigenvectors. However, sometimes we save only a tensor file to save the
disc space, because as long as we save the raw tensor file, we can
re-generate all the derived images. To perform tracking, you need to load
the tensor file, calculate FA and eigenvectors, save them, and load them
again for tracking. The "using the tensor images" option save time by
eliminating these steps when you have only the tensor file. You just load
the tensor file and start tracking.

Susumu

On Wed, Apr 21, 2010 at 5:32 AM, <Michael.Nelles at ukb.uni-bonn.de> wrote:

>
> Hi all,
>
> I have questions concerning the two Fiber Tracking methods one can choose
> when starting Fiber-Tracking:
> what is the difference between tracking "using principal vector and FA map"
> and tracking "using tensor images" ?
> Are there any relevant differences of tracking results (of e.g. the CST) to
> be expected ?
>
> Is it true that you have to flip the z-component of the Eigen-Vector when
> processing Philips DTI data ?
>
> Thanks in advance !
>
> M. Nelles
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