Hi - yes, you might well need to apply some masking to the individual
images, which might also involve amending the TBSS scripts so that the
calls to FNIRT can use the masking options. If the brains have very
large variations due to the operations it might be hard to get TBSS to
give reliable correspondence across subjects, but you can evaluate
that qualitatively by eye by looking at the all_FA image as a movie
loop in FSLView. You might decide though that it would be safer to
just decide which tracts you wish to investigate, and hand-seed
tractography using FDT to get each subject's data analysed.
Cheers.
On 2 Oct 2008, at 01:02, Mahinda Yogarajah wrote:
> Hi,
>
> Could anyone offer some advice as to the use of TBSS on post-
> operative data.
> For example if I had a dataset of patients who have all had similar
> operative procedures what is the best way to proceed through the
> registration steps of TBSS. I am under the impression that one
> might run
> into problems with the non-linear aspects of registration. Would
> one need
> to apply masks to each area of resection in individual images ?
>
> Thanks.
>
> M Yoga
>
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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)
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