On Thu, 24 Feb 2000, Xavier Chitnis wrote:
> Dear All,
>
> I am trying to analyse some old T1-weighted scans. They were done on a 1.0T
> scanner, and so the image contrast is not good. When normalising and
> segmenting the scans, a thin ribbon of scalp is consistently left around
> the brain. I have analysed plenty of other scans very successfully, so I
> think this is due to poor scan quality. However, before I give up, I was
> wondering if anyone had any suggestions.
>
> Many thanks
>
> Xavier
Dear Xavier,
another possibility worth thinking of is to perform a skull stripping
prior to the normalization procedure which then warps the stripped brain
to a template only comprising the brain.
We use our own algorithms (not published yet) for this and it works fine
without preprocessing even for huge noise or non-uniformity. There are
several software tools available that shall be able to do the same (e.g.
MRI3dX, SURFER, C.N.S., BrainImage).
Regards,
Horst
------------------------------
Horst K Hahn
MeVis - Center for Medical Diagnosis Systems and Visualization
Universitaetsallee 29
D-28359 Bremen
Germany
+49-421-218-9183 fon
+49-421-218-4236 fax
[log in to unmask]
http://www.mevis.de
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