not sure. They will be less accurate I would think
On Thu, 10 Mar 2011,
Tricia Merkley wrote:
OK, thanks so much for letting me know. Any idea how it might affect cortical
thickness or subcortical volume results (over-estimation/under-estimation)?
We do try to use the same image acquisition parameters for all subjects in a
given study of course, but this was an unusual case...
Thanks,
Tricia
--- On Thu, 3/10/11, Bruce Fischl <fis...@nmr.mgh.harvard.edu> wrote:
From: Bruce Fischl <fis...@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] Small voxel size
To: "Tricia Merkley" <tmerkl...@yahoo.com>
Cc: "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Date: Thursday, March 10, 2011, 6:37 AM
Hi Tricia,
I don't think you can use that subject. It will only have 39% of the SNR
of the others. Sorry :<
Bruce
On Wed, 9 Mar 2011, Tricia Merkley wrote:
The native resolution of the other subjects is (1,1,1)mm voxel size and
(256,256,160) voxels, whereas this subject is (0.7,0.7,0.8) mm voxel size and
(288,288,165) voxels. Sorry that wasn't clear in my previous email. I'd
appreciate any insight that anyone might be able to share.
Thanks,
Tricia
--- On Wed, 3/9/11, Bruce Fischl <fis...@nmr.mgh.harvard.edu> wrote:
From: Bruce Fischl <fis...@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] Small voxel size
To: "Tricia Merkley" <tmerkl...@yahoo.com>
Cc: "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Date: Wednesday, March 9, 2011, 5:01 PM
What is the resolution of your other subjects?
On Mar 9, 2011, at 5:21 PM, Tricia Merkley <tmerkl...@yahoo.com> wrote:
Hello,
One of our subjects was scanned with (0.7,0.7,0.8) mm voxel size, although all
other acquisition parameters were the same as the other subjects. I'm
wondering to what extent this might affect the results of the subcortical
segmentation, cortical thickness measurements, etc., as compared to 1mm cubic
voxels. When would it be appropriate to use the '-cm' flag for mri_convert?
Thanks,
Tricia Merkley
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