by default we run both parcellations, so you should have them. Which to
choose should be based on what your questions are. The Desikan-Killiany
has in general larger units than the Destrieux one, but also anatomically
different.
As for your own training set, you'll need to create a set of manual
labels and save them in .annot files, then run mris_ca_train on them.
It should be documented on our wiki.
cheers,
Bruce
On Tue, 2 Oct
2007, [EUC-KR] "Woo Suk, Tae" wrote:
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:[EMAIL PROTECTED]
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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