Hi,
On 16 Nov 2007, at 16:03, Antonios - Constantine Thanellas wrote:
> I was wondering how important is an accurate brain extraction before
> sienax
> measures brain volume.In some of my scans there's no way (except from
> manually correcting some brain extraction segmentation problems) of
> tunning
> bet_robust so in some cases a small brain portion is not included
> and in
> some others some non brain portions are included.
It can be important, if the inaccuracies in BET are significant. If
you really can't get BET to work well on this data then you may need
to resort to hand-editing.
> In case of siena this is not a problem since an OR combined mask is
> applied
> to the images but what about sienax case (when you measure volumes
> of the
> same patient in different time intervals)?
Indeed.
> Do you think that i should first manually correct the brain
> segmentation
> errors in order to look as perfect as possible and then feed sienax
> with
> them?
Maybe, yes. If you'd like to upload one example that is particularly
problematic we can have a quick look to see if there's any BET setting
that might be tweaked.
Cheers.
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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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