Hi - it doesn't quite work like that. If you use the registration part
of the FDT GUI then the transform between diffusion and structural
data will get computed and saved.
Then when you specify a mask in structural space you just tell FDT
that this is the space it's in, and it will use the appropriate
transform for you, when running the tractography.
Cheers.
On 21 Feb 2008, at 19:08, Roman Loonis wrote:
> I have already registered my images (the anatomical to the diffusion
> data) prior to using bedpostx
> and I have modified correspondingly the resulting changes in the
> vector directions for my bvecs file.
> I had to do so because I am looking at monkey diffusion data. My
> question is the following...
> Although the files are properly registered and therefore need no
> transformation file, they still have
> different resolutions. When I input my masks which I have drawn on
> the anatomical, do I need to
> indicate in probtrackx that the seed space is not the diffusion
> space? How can I make sure that there
> is a proper translation of the higher resolution mask into a lower
> resolution one?
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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