Hi Rahul and Bruce,
I'm trying to evaluate the usefulness of 7T data for the measurement of cortical thickness. But as FreeSurfer doesn't perform too well using high resolution data right now I'm also using a module within Slicer to get results. Though I'm still trying to process my high resolution data with FreeSurfer.
To compare the results between this module and FreeSurfer and to do a cross-scanner comparison I am comparing the mean average and std dev of the frontal, temporal, occipital and parietal lobe. This is done because of the parcellation of the Slicer module, so these parcellation units would be helpful. The subjects I have used and will be using are young healthy adults.
Regards, Falk
-----Original Message----- From: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf Of rahul@nmr.mgh.harvard.edu Sent: Wednesday, May 13, 2009 2:55 PM To: Bruce Fischl Cc: freesurfer@nmr.mgh.harvard.edu; Falk Lüsebrink Subject: Re: [Freesurfer] Literature values for cortical thickness
Hi Falk,
We do indeed have cortical thickness values for each of the parcellation units for a range of subjects (healthly elderly, middle age and young controls and Alzheimer's disease subjects). Which parcellation units are you looking for? A whole lobe?
Best,
rahul
Hi Falk,
we published some values in our Cerebral Cortex paper , but I suspect the effective thickness will vary a bit as a function of pulse sequence, and certainly it will vary with things like age. Rahul has probably tabulated by parcellation unit if that helps.
cheers Bruce
On Wed, 13 May 2009, Falk Lüsebrink wrote:
Hi everyone,
As I dont do a study in which I compare a group of subjects with some kind of abnormality with a control group I was looking for literature values for cortical thickness. The only paper I found which was written by von Economo et al. in 1925 doing a post-mortem analysis.
Are there any more recent sources available which maybe even cover in-vivo values for regional cortical thickness? Actually Im looking for average values across the whole lobes.
Thanks in advance,
Falk
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