Dear all,
Maybe this is a very easy or stupid question for some people. But I was really confused.
I was doing fiber tracking using ProbtrackX of Fdt. I used a single mask as the seed, and specified one waypoint mask and one termination mask. All the three masks were in standard space. I then chose 'seed space is not diffusion' and specified the transformation matrix (standard2diff) and reference imge (MNI_T!_152_brain).
My question is: in this way of fiber tracking, which space are the resulted fibers in? Several guys in my group told me that the fibers I got should still be in the diffusion space. FSLVIEW all told me the fibers were in "aligned-anatomical space" when I open them.
However, I found that the fibers matched the standard FA image white matter better than the native FA image when I contrast these two. And the most weird thing is, after I used the FLIRT to transform these fibers into the standard space, the fibers jumped to the right hemisphere and part of them were out the brain!
I then tried the FLIRT on other images which were already in the standard space. I got almost the same weird results.
Thus I guess these fibers I got were already in the standard space even FSLVIEW told me they were not?
Any Help will be highly appreciated.
Best regards,
Huadong
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H Xiang PhD Candidate
Neurocognition of language & MR-Methods Group
Donders Institute for Brain, Cognition and Behaviour,
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
PO Box 9101
6500 HB NIJMEGEN
The Netherlands
http://www.ru.nl/neuroimaging
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