Hi -
the reason Bet performs badly is that it is a whole head scan, so the
initial Bet sphere is not contained within the brain.
If you take an ROI which has the brain roughly in the middle
avwroi 3d 3d_roi 0 170 0 256 100 150
then run Bet on this
bet 3d_roi 3d_roi_brain -f 0.5 -g 0,
The results are pretty good.
you can then try tweaking the -f and -g parameters to see if you can
improve the result, but it looks fine to me...
Cheers
Tim
On Wed, 3 Jul 2002, Erik-Jan Vlieger wrote:
> Hi,
>
> I would very much like to use bet for brain extraction, however, the scans I
> have give quite poor results. An example scan (no betted yet) can be found
> here:
> [log in to unmask]" target="_blank">ftp://mri-amc:[log in to unmask]
>
> Is anyone able to increase the performance of bet by parameter tweaking, or is
> the inherent contrast of the scan simply to low and must I go and look for an
> alternative?
>
> Thanks a lot,
> Erik-Jan Vlieger
>
--
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Tim Behrens
Centre for Functional MRI of the Brain
The John Radcliffe Hospital
Headley Way Oxford OX3 9DU
Oxford University
Work 01865 222782
Mobile 07980 884537
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