Great! OK. Now I understand. Thanks for reply.
Petr
---------- Původní zpráva ----------
Od: Eugenio Iglesias <e.igles...@bcbl.eu>
Komu: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Datum: 15. 4. 2014 16:18:59
Předmět: Re: [Freesurfer] FS volume discrepancies
"Dear Petr,
the volumes from the subfields are in voxels. Since the voxels are 0.5mm
isotropic, their volumes is (1/8) cubic millimeters. Therefore, you need to
divide the volumes by 8 to convert to mm3.
Kind regards,
/Eugenio
Juan Eugenio Iglesias
Postdoctoral researcher BCBL
www.jeiglesias.com
www.bcbl.eu
Legal disclaimer/Aviso legal/Lege-oharra: www.bcbl.eu/legal-disclaimer
----- Original Message -----
From: "zach petr" <zach.p...@post.cz>
To: "Freesurfer support list" <freesurfer@nmr.mgh.harvard.edu>
Sent: Tuesday, April 15, 2014 4:05:43 PM
Subject: Re: [Freesurfer] FS volume discrepancies
Thanks for reply. But adding subfield volumes together leads to too high
number compared to overall hippocampus volume. Like 9500 mm3 compared to 2.1
mm3.
Petr
---------- Původní zpráva ----------
Od: Bruce Fischl <fis...@nmr.mgh.harvard.edu>
Komu: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Datum: 15. 4. 2014 14:35:13
Předmět: Re: [Freesurfer] FS volume discrepancies
>From Eugenio:
------------------------
Dear Petr,
at this point, the hippocampal subfield module is - to some extent -
independent from the whole hippocampal segmentation. The values you will
obtain from adding the subfield volumes together will be around 15% lower
than the volumes from aseg.stat, but they will still be very highly
correlated.
Kind regards,
------------------------
On
Tue,
15 Apr 2014, zach.p...@post.cz wrote:
>
> I have several issues concerning automated volumes calculation. When you
> look at the aseg.stat for hippocampal volume (in mm3) it gives different
> value compared to hippocampal subfields volume calculation (which comes in
> voxels but there is stated that 1 voxel is 0.5mm3). How is it possible? I
> presume that anatomical definition and subfield incorporation is the same.
>
> Next - if you look at the whole hippocampal formation volume in
hippocampal
> subfield calculations it is way lower compared to the summation of the
> CA1-CA4 + dentate gyrus = hippocampal formation. What could be explanation
> of this?
>
> Petr
>
>
>
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