Hi- are you looking at volumes estimated by SIENAX after adjusting for
head size or uncorrected? The latter will agree with FAST, because
that's what SIENAX uses. Cheers
--------------------
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington,
Oxford. OX3 9 DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask]
http://www.fmrib.ox.ac.uk/~steve
----------------------
On 4 Jun 2010, at 14:48, Gilberto Sousa Alves <[log in to unmask]>
wrote:
> HI, FSL experts,
>
> I am trying to calculate total intracranial calculations using
> SIENAX, according to the steps below (based on previous posts of
> this forum). My aim is to calculate a total intracranial volume for
> each subject; and then to use this to normalise brain volumes that
> were calculated with FAST. For the total brain volumes I have used
> CSF+GM+WM from the FAST segmentation. However in some subjects the
> total intracranial volume calculated via the method below returned
> values which were less than the total brain volume calculated with
> FAST. This does not make sense. Perhaps there is something wrong
> with my procedure with SIENAX as outlined below.
>
>
> I would be very grateful for any help.
>
>
> Gilberto Sousa Alves
>
> Wolfgang Goethe Universität
>
> Frankfurt am Main - Germany
>
>
> 1) fslroi input output xmin xsize ymin ysize zmin zsize
>
> 2) Review image using the fslview
>
> 3) Run the command sienax image_cropped.nii.gz -o image_sienax -B "-
> f 0.3 -R"
>
> 4) See the report.html file and confirm if the segment is good
>
>
> 5) Open the report.sienax file
>
> 6) Obtain the ICV value, after multiplying Brain times VSCALING
>
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