Dear Dr Bruce Fischl.

How are you?
I preprocessed 41 subjects' MRI to measure the volumes of
the cortical and subcortical structures with ver 3.04 Freesurfer.
What kind of atlas (Desikan-Killiany atlas or Destrieux atlas?) was used for my data?
And how can I choose the atlas between the two atlases.

If you provide me the tool for new training set, I'd like to create my own study specific atlas.
Really thank for your reply!

Sincerely

Woo Suk, Tae

-----Original Message-----
From: Bruce Fischl [mailto:fischl@nmr.mgh.harvard.edu]
Sent: Monday, October 01, 2007 9:03 PM
To: Woo Suk, Tae
Cc: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] automated parcellation: training set of Freesurfer

there are two training sets we use for the two difference parcellation
schemes. Once consists of about 40 subjects distributed into 4 groups
(young, middle aged, elderly and Alzheimer's for the Desikan-Killiany
atlas). The other is 14 young and middle aged subjects in the Destrieux
atlas. Defining a new training set is extremely labor intensive, but we
distrubute tools for you to do so if you decide to.

cheers,
Bruce

On Mon, 1 Oct 2007, Woo Suk, Tae wrote:

> Dear experts.
>
> In the previous technical papers of Freesurfer, the the method of automated parcellation was described,
>
> "This procedure automatically assigns a neuroanatomical label to each voxel
> in an MRI volume based on probabilistic information automatically estimated
> from manually labeled training set."
>
> I'd like to know more detail, how many training set was used in Freesurfer,
> and is it possible to define the study specific training set for automated parcellation using Freesurfer?
>
> Sincerely
>
> Woo Suk, Tae
> Seoul, Korea
>
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