Hi - the prob maps are just the probability (which can also be though of
as partial volume) maps output from the main stage in the segmentation,
which is primarily a hard segmentation (but then at the last minute using
the voxel intensities to estimate the probability).
The -e partial volume maps, if asked for, is a separate stage run after
the main one described above, where not only are intensities used to
estiamte partial volume, but the partial volume vector for each voxel is
spatially regularised using a second MRF. Therefore this is likely to be
closer to "the truth" than the simple prob outputs.
Thanks, Steve.
On Tue, 6 May 2003, Adolf Pfefferbaum wrote:
> Stephen,
>
> What is the difference between the
> partial volume classification:
> -e: enable partial volume classification
>
> and the probability maps:
> -op output probability maps (one for each class)
>
> Thanks,
>
> Dolf
> ____________________
> Adolf Pfefferbaum,MD
> Neuroscience Program
> SRI International
> 650-859-2927 phone
> 650-859-2743 FAX
>
>
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Stephen M. Smith MA DPhil CEng MIEE
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe 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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