Hi,
The mask is binarised before applying (in case it's not already
binary) and the values averaged over it (for each time point). So the
units of the output will be the same as the input data. In this case
FA is a dimensionless quantity supposedly in the range 0:1.
Wrt the second question, it depends on your ROI and your question. The
point of the skeletonisation is to correct for residual alignment
errors after the initial nonlinear registration (that created all_FA).
Hence you will probably get the most interpretable results by using
ROIs on the skeleton in general.
Cheers.
On 12 Nov 2008, at 20:58, Melissa Lopez-Larson wrote:
> Thank you. This seemed to work well. I do have 2 other questions
> for you. What are the
> units of the outputs on the fslmeants when you use the
> all_FA_skeletonised. Also, why
> wouldnt you run the flsmeants on the all_FA data with your ROI?
> Thanks again for all of
> your help. Melissa
>
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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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