On Thu, Jul 23, 2009 at 9:41 AM, Steve Smith <[log in to unmask]> wrote:

Hi - if the bias field is in the centre only, that probably isn't a big factor here.
Have you tried reducing the -f option value?
Cheers.

On 23 Jul 2009, at 14:11, Jay Ives wrote:

I am intending to do VBM, but have noticed BET is not including areas of
cortex in some places, particularily at the vertex and frontal poles. This is
clearly going to be unacceptable.

I have tried various alterations to parameters without success. BET does not
give me this problem on images from 1.5T.

Could this be due to some bias field in my 3T images? They do look extra
bright in the centre of the images.

If so, is there some tool or process to even out the intensity prior to applying
BET?

Thx

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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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