Hi Bruce, thanks! so if the yellow line is ok I don't need to remove the voxel exceeding or add the voxel missing right? thanks valentina

________________________________

From: Bruce Fischl [mailto:fischl@nmr.mgh.harvard.edu] Sent: Thu 5/4/2006 7:15 PM To: Durastanti, Valentina (NIH/NINDS) [F] Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] segmentation

Hi Velentina,

the segmentation is just a preliminary estimate of the gray/white boundary. The ?h.white surface (usually displayed in yellow) is the "official and final" estimate and the one you should be worried about.

Bruce On Thu, 4 May 2006, Durastanti, Valentina (NIH/NINDS) [F] wrote:

Hi,

I have a question: at the end of the segmentation (before the manual editing) I found that there are some voxel exceeding the yellow line and I can't figure out if they will be included in the WM count or if they will be included in the GM count. Have I to remove them even if they go over the line?

Thanks

Valentina

Thanks Valentina

________________________________

From: Bruce Fischl [mailto:fischl@nmr.mgh.harvard.edu] Sent: Thu 5/4/2006 9:21 PM To: Durastanti, Valentina (NIH/NINDS) [F] Cc: freesurfer@nmr.mgh.harvard.edu Subject: RE: [Freesurfer] segmentation

yes. On Thu, 4 May 2006, Durastanti, Valentina (NIH/NINDS) [F] wrote:

Hi Bruce, thanks! so if the yellow line is ok I don't need to remove the voxel exceeding or add the voxel missing right? thanks valentina

---

From: Bruce Fischl [mailto:fischl@nmr.mgh.harvard.edu] Sent: Thu 5/4/2006 7:15 PM To: Durastanti, Valentina (NIH/NINDS) [F] Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] segmentation

Hi Velentina,

the segmentation is just a preliminary estimate of the gray/white boundary. The ?h.white surface (usually displayed in yellow) is the "official and final" estimate and the one you should be worried about.

Bruce On Thu, 4 May 2006, Durastanti, Valentina (NIH/NINDS) [F] wrote:

...

Hi,

I have a question: at the end of the segmentation (before the manual editing) I found that there are some voxel exceeding the yellow line and I can't figure out if they will be included in the WM count or if they will be included in the GM count. Have I to remove them even if they go over the line?

Thanks

Valentina

Hi Velentina,

which one you use really depends on what part of the cortex you're interested in. Christophe's is more detailed, Ron and Rahul's is a bit more interested in medial temporal lobe.

cheers, Bruce

On Fri, 5 May 2006, Durastanti, Valentina (NIH/NINDS) [F] wrote:

Hi, I have a question about the two atlas (Desikan-Killiany and Christophe) now available in free-surfer: I was wondering if there is anything published already on cortical thickness of different regions of the brain selected according with each one of the atals. If so, I would love to compare the measurements I got from my normal population. Furthermore, which one is recommended to be used?

Thanks Valentina