Hi Steve,
Thank you very much for your quick response.
So I can't use sienax to caculate the brain volume. Actually, I have gotten
4 classes of segmentation brain image by FAST. But I don't know what I got
to do next. Can you give me some more information that how to caculate the
segmented brain volume outside of MEDx. Thanks!
Regard,
Qingyan
>From: Stephen Smith <[log in to unmask]>
>Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [FSL] Estimate Lesion volume
>Date: Wed, 15 Aug 2001 08:56:06 +0100
>
>Hi - thanks for your email.
>
>SIENA is measuring change in total brain volume and SIENAX is measuring
>normalised brain volume - neither is designed to measure lesions I'm
>afraid - both will normally count lesion as brain matter.
>
>You may be able to find lesion volumes by first using BET to extract the
>brain and then using FAST to segment the resulting brain image - you will
>probably have to specify exactly how many classes you want (ie for lesions
>this will be one more than the number of "normal" appearing tissues). This
>analysis can be run inside or outside of MEDx with the BET and FAST GUIs.
>
>Hope this helps - Steve.
>
> Stephen M. Smith
> Head of Image Analysis, FMRIB
>
> 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
>
>On Tue, 14 Aug 2001, QingYan Guan wrote:
>
> > Hi,
> >
> > I tried to estimate the lesion volume in brain using siena and sienax.
>But
> > both program didn't give the information that I want. The second time
>point
> > brain volume was even got smaller than first time point.
> >
> > Another question is, when I tried to modify the segmentation of brain,
>I
> > segmented manually the part of lesion as white matter, then how can I
> > define all other brain part as gray(or sth)? Is there a option for
>sienax to
> > have more than 3 classes of tissues? Or is there any way to get region
>of
> > lesion without using MEDx?
> >
> > Any other method or point for lesion analysis?
> >
> > Thanks a lot!
> >
> > Best regards,
> > Qingyan
> >
QingYan [log in to unmask]
(425)391-8251
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
|